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 Battery charging refurbishing 101
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shakamuni01
Average Member


USA
213 Posts

Posted - April 23 2012 :  02:05:07  Show Profile Send shakamuni01 a Private Message  Reply with Quote
I thougt I would start a simple post here after reading the battery section and getting all my fact jumbled after reading several hundred posts on it, just in case somebody wanted a summary.

So hopefully I got it right and please correct me if I am wrong.(I know there are several perspectives.)


To get a battery up to best performance

You want to charge up to about 13 to 14 v(some say 15 or 16v) without popping you battery for about 30 hours(or until the voltage platuaeas and starts to drop a bit) Let rest for 12 hours between chargings and dischargings. Ideally you want to charge and discharge at the c-20 rate which are as follows:

Charge a battery for 30 hours or to its full capacity and discharge at its C20 rate until reaches 2volts below its resting phase.


This a Battery CCA to AH and C20 and C25 charge and discharge
The C25 is = to 80% which is good for a week battery.

AH------C20AMPS---Watts---------CCA-----C25-80% DISCHARGE RATE
1--------0.05--------0.6------------7--------0.032
1.2------0.06--------0.72-----------8.4------0.0384
2--------0 0.1-------1.2------------14-------0.064
3--------0.15--------1.8------------21-------0.096
4--------0.2---------2.4------------28-------0.128
4.5------.225--------2.7------------31.5-----0.144
7--------0.35--------4.2------------49-------0.224
9--------0.45--------5.4------------63-------0.288
10-------0.5---------6--------------70-------0.32
18-------0.9---------10.8-----------126------0.576
20-------1-----------12-------------140------0.64
34-------1.7---------20.4-----------238------1.088
43-------2.15--------25.8-----------301------1.376
55-------2.75--------33-------------385------1.76
71-------3.55--------42.6-----------497------2.272
78.6-----3.93--------47.16----------550.2----2.5152
84.4-----4.22--------50.64----------590.8----2.7008
89.3-----4.465-------53.58----------625.1----2.8576
100------5-----------60-------------700------3.2
110------5.5---------66-------------770------3.52
115------5.75--------69-------------805------3.68
125------6.25--------75-------------875------4
225------11.25-------135------------1575-----7.2=T105
375------18.75-------225------------2625-----12 =L16
450------22.5--------270------------3150-----14.4
500------25----------300------------3500-----16
2025----101.25------1215-----------14175----64.8=BIG BANK



To Refurbish a battery:

make sure the ports are topped off.(research how much to fill for different types of batteries)

Sealed battery tops can be popped off see other threads on this section for that.

Drain the battery all the way down until it is stone dead.
Charge up at the highest power of whatever charging machine you got doing a "cold boil"(not sure what this exactly means- but I guess juice it up hard without heating the battery up). Bring it up to the max charge point for 30 hours. Leave for 12 hours. Then fully discharge to stone dead. DO this three times. And hopefully you have a revived battery.

Some interesting thing mentioned was you can replace the acid battery acid with Alum and make it into a alkaline battery, but then charge slowly like you would an alkaline battery. Gel Cells once they are dead can't be revived I think. Well I think I will stop here because I feel my Alzheimer's kicking in and it will start getting into details I cant remember.

Anyway without getting into too much detail please feel free to correct and add onto this summary just to keep it as a quick reference tool.















Edited by - shakamuni01 on April 23 2012 02:06:51

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49er
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USA
4426 Posts

Posted - April 23 2012 :  10:48:07  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

You have a good start on D&C of batteries and from there you have to take the info and learn from experience. Just remember each battery is different and you will have to evaluate separately. If you run into any questions just ask that is what this forum is all about and thanks for doing your homework.

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - April 23 2012 :  17:47:27  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
I'm hoping to help (and learn) on this thread.

It's very important to some of us, that we get this right.

Thanks Shak for starting this!

If I've understood correctly, by lessons passed to me,
Time becomes more important then C20 or C25 rate (yet not to exceed).

"I" have found myself charging batteries 'well' below the 'C' rate of the battery, but they've worked through a D/C cycle similar to what you describe.

Doug can be 'very' helpful guiding your way through this 101 lesson.

Would love to see this thread grow into something a lot of us can learn from.





Old in age, not in mind, so
'Teach me something new'!

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shakamuni01
Average Member



USA
213 Posts

Posted - April 23 2012 :  21:26:35  Show Profile Send shakamuni01 a Private Message  Reply with Quote
THanks guys,

AWG, can you expand a bit on what sort of time. Also with gel cells did I get it right that you can top them off with some distilled water if the gel has "shrunk" below the elements. This again is not on experience but memory of a post addressing this. I do remember reading one a gel has gone bad you can't save them- can anybody expand on this?
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49er
Administrator



USA
4426 Posts

Posted - April 23 2012 :  21:39:46  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

On the gel battery I have not heard of any one that has recovered one of them yet. a gas mat battery you can put in water and some times that works and some times it doesn't. AWG ?? need more info

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - April 24 2012 :  16:56:03  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
quote:
Originally posted by shakamuni01

THanks guys,

AWG, can you expand a bit on what sort of time. Also with gel cells did I get it right that you can top them off with some distilled water if the gel has "shrunk" below the elements. This again is not on experience but memory of a post addressing this. I do remember reading one a gel has gone bad you can't save them- can anybody expand on this?



Have a feeling AWG might be me (ODR or Olddawg) since the question refers to 'time'.

("I" have found myself charging batteries 'well' below the 'C' rate of the battery, but they've worked through a D/C cycle similar to what you describe.)

I should have added; for the 20hrs..
That's what I meant about time being important.

I have a couple of 30ah batteries I'm working with.
C20 rate is about 1.5amps
I'm now pushing (charging at) 800ma and charging to 14.5 in 4 hrs...
I'm working my C20 rate down (working my amperage down) to equal a 20hr charge.
I still draw 1.5amps (or there abouts) and see the draw time increasing (actually reduced before I lowered the push, but after several D/C cycles).

Doug's a smart 'cookie', he'll help you a lot in this task of devising a definitive process.

With what he's taught me and I'll will happily defer to his response (corrections), that when folks say 'depends on the battery', I believe this has to do with matching amperage pushed (charge) to 'time' it takes to get to 'full' charge.

Hope that helped explain what I meant about 'time'.



Old in age, not in mind, so
'Teach me something new'!

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49er
Administrator



USA
4426 Posts

Posted - April 24 2012 :  18:06:19  Show Profile Send 49er a Private Message  Reply with Quote
Hi ODR

Just glad to help..

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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shakamuni01
Average Member



USA
213 Posts

Posted - April 24 2012 :  22:44:43  Show Profile Send shakamuni01 a Private Message  Reply with Quote
Yes I mean ODR,

What sort of charging system you you have solid state or some sort of wheel? Also when people have mentioned a cold boil what does that mean in terms of using a bendini circuit?
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msmjr
Average Member



USA
444 Posts

Posted - April 25 2012 :  07:51:15  Show Profile Send msmjr a Private Message  Reply with Quote
Hey Shak
Cold boil refers to the battery, matters not the method of charging. When the battery reaches a certian level it will start to bubble giving the appearance that its boilling. With a conventional charger the battery can actually get hot, but with a Bedini and or SS SSG charging backwards (sort of lol) they stay cold. Depending on the battery this can start at the high 13v range but the real boil is 14.8-15.2 volts.
Hope this helps, Keep us posted.

Growing old is mandatory, Growing up......optional.
He is wise who gains wisdom from another's mishaps.
—Plutius Syrus
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49er
Administrator



USA
4426 Posts

Posted - April 25 2012 :  08:38:55  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

msm did a great job on the cold boiling explanation and we talk about it so much because it is the most important part of battery charging that requires NO special tools or meters just scientific observation. What you are looking for is bubbles in each sell but understanding what you see is also important and that is where your eyes need to be protected because you will be over the battery quite a while and most all batteries belch and spray acid up and out. What you need to see is a lot of small bubbles in every cell and if not that tells you that, that cell is shorted and needs more D&C cycles. When all cell are bubbling the same then your battery is the best it will be as far as desulfation. Hope this helps

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - April 25 2012 :  16:22:51  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
Hey Shak!

I actually have both, but mainly am working with my SS units.
So much less noise and no complaints from the family cause Dad's reactor is running (as they've Nickname my circuits).

I am very happy with my version of Doug's SS unit (have 2 now, 1 small, 1 larger), but my Sampu Express (Poppy's) and my small 6" fan Bedini (Imhotep style) has their places according to what I'm trying to do.

Someone once 'coined' the phrase 'arsenal' (sorry I do not recall who) which has become a phase I tend to use now and understand (well a bit more).

I don't see any one circuit has the "Do All, Go To" circuit.
Too many variables (and that's speaking of, a battery, a singular AH rating).

Building that arsenal seems to be an important part of conditioning, then charging.

Mine needs to get bigger for I have larger batteries yet to deal with, but with time (sorry that word again), I should be able to move the larger batteries down to the smaller circuits to charge them.

What cured my 30ah batteries, could be what charges my Big Boys.

Thus is 'my' goal...







Old in age, not in mind, so
'Teach me something new'!

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shakamuni01
Average Member



USA
213 Posts

Posted - April 26 2012 :  00:21:14  Show Profile Send shakamuni01 a Private Message  Reply with Quote
thanks guys for the continued info. When you say D & C 49er I am assuming that is the full discharge to 0 and back up......

I also wanted to bring up the topic of using a capacitor between the secondary battery and the circut. Heard different view on it being useful or not, but if I do choose to used on what sort of voltage capacity and uf would you all recommend.
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msmjr
Average Member



USA
444 Posts

Posted - April 26 2012 :  06:18:13  Show Profile Send msmjr a Private Message  Reply with Quote
Hey Shak
No No Not 0. 11.8v-12.2v should be your target for discharge, again depends on the battery condition. I also have used 1v below 1hr rest. As I see it, consistency is the most important thing. How long does it take to discharge to 11.8v, each time you do it it should last longer and for charging, how long to charge to 15v, each time should be shorter. Some batterys deserve different tactics, as Ive seen 49er recomend, but for the most part start there.
Between my work and my little SS I have a hard time sticking to a hard and fast C20/C25 but I do have a schedule I work with and so far it does good.

Growing old is mandatory, Growing up......optional.
He is wise who gains wisdom from another's mishaps.
—Plutius Syrus
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49er
Administrator



USA
4426 Posts

Posted - April 26 2012 :  09:34:24  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

msm is correct on the -0- voltage never do that and as far as cap 1uf at 250v would be good

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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shakamuni01
Average Member



USA
213 Posts

Posted - April 26 2012 :  22:08:47  Show Profile Send shakamuni01 a Private Message  Reply with Quote
Hmmm...

So never discharge the battery down to zero at least the first time you get it. I thought I saw that on the bendini video twally posted, but that may have been when he replaced the acid with Alum and made into an alkaline battery that has a different dynamic.

I tried to stick a 1uf cap before the battery but the neon light started to flash. It was an AC cap but my understanding was that you can use an AC cap on DC but not the other way around. Perhaps I will try and dig up a different farad cap and play with it til it doesn't flash.

I have a general question about Caps actually. I was wanting to try and put another transistor on the charging line where the voltage spike comes out and see if I can cut the Bemf spike an extra time to see if some speacial "more powerful" Bemf is produced. So I was going to stick a TV transistor that will get activated also by the trigger coil, but would be slightly delayed from the first one. COuld a cap slightly delay the signal from the trigger coil to that second transistor down the line. Just an idea/little experiment I was thinking.
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49er
Administrator



USA
4426 Posts

Posted - April 27 2012 :  08:27:43  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

your neon is coming on because you have charged to cap large enough to excite the neon and that is another reason not to use a neon at all.

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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SKYPE bxx49er
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shakamuni01
Average Member



USA
213 Posts

Posted - April 27 2012 :  21:28:05  Show Profile Send shakamuni01 a Private Message  Reply with Quote
but the Neon is there to protect the transistor right. My assumption was that if the neon is coming on the transistor is getting overwhelmed.
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49er
Administrator



USA
4426 Posts

Posted - April 28 2012 :  09:55:25  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

The neon is coming on because the cap is charging up to a max voltage of 250v just like you told it to. IMHO the neon only gives you more problems example if you run into a big spike it will absorb it but only a couple of spikes then if you don't catch it by the 4 spike it has popped the transistor where as if you don't have the neon on the line the battery absorbs the spike just like you have built the unit. The battery is your sponge for spikes and once the neon shorts out then there is a dead short and will take out that one transistor and may be the one next to it. The problem is you can't guaranty that the spike will only go up to 120 to 140 volts after that you WILL blow the neon. Now ask your self how high will a 250v cap go???? I do agree with you about putting one across the front it is a cheep way to give you more power into your transistor BUT I would say you can't do both, one or the other. IMHO

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
You must be logged in to see this link.
SKYPE bxx49er
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shakamuni01
Average Member



USA
213 Posts

Posted - May 03 2012 :  21:34:53  Show Profile Send shakamuni01 a Private Message  Reply with Quote
I see. Interesting because when I stuck my o-scope on my meter I was only reading about 100v spikes so I am surprised to see the 250v 1 uf cap was forcing the neon to ignite. I guess I could just get a 450v cap. Would that be dangerous for the battery. Thanks for your input 49er.
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49er
Administrator



USA
4426 Posts

Posted - May 04 2012 :  08:42:39  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

I will say NO but what is the purpose 250 to 450 cap? just my curiosity.

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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SKYPE bxx49er
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shakamuni01
Average Member



USA
213 Posts

Posted - May 04 2012 :  09:21:18  Show Profile Send shakamuni01 a Private Message  Reply with Quote
I was thinking that the 450 could absorb more of the spike, but I guess that is not true as I write this because it is more about the farads than the voltage ratings right?
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49er
Administrator



USA
4426 Posts

Posted - May 04 2012 :  09:43:03  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

That is true but only you know what you want it for. Finding bigger costs more so know what you need by asking your self.

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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shakamuni01
Average Member



USA
213 Posts

Posted - May 04 2012 :  19:35:05  Show Profile Send shakamuni01 a Private Message  Reply with Quote
It's hard to know what I want when I don't know quite what I am talking about LOL.
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49er
Administrator



USA
4426 Posts

Posted - May 05 2012 :  08:25:52  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

If you want to find out, experiment for that is the only way to gain knowledge.

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
You must be logged in to see this link.
SKYPE bxx49er
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shakamuni01
Average Member



USA
213 Posts

Posted - May 15 2012 :  07:08:08  Show Profile Send shakamuni01 a Private Message  Reply with Quote
THought this was an interesting video for those wanting to make an Alum battery. Perhaps good for batteries that are simply over sulphated.

You must be logged in to see this link. about refurbishing batteries with Alum. Nothing terribly profound but a little practical guide
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shakamuni01
Average Member



USA
213 Posts

Posted - May 18 2012 :  07:16:13  Show Profile Send shakamuni01 a Private Message  Reply with Quote
So if you discharge it that way SD3t I suppose you are charging it pretty fast as you wouldn't want to sit there with multimeter for hours. When it rises does it rise for a bit and go down, or does it rise and the light goes out and just stays at that voltage?
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49er
Administrator



USA
4426 Posts

Posted - May 18 2012 :  14:30:01  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

With the headlight on you read the voltage until the volts get to the point you want. Take off the light and watch the voltage recover after a 10 hr rest.

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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shakamuni01
Average Member



USA
213 Posts

Posted - May 19 2012 :  03:52:02  Show Profile Send shakamuni01 a Private Message  Reply with Quote
HI 49ER

I was referring to this part that SD3t mentioned, and to catch that point when the voltage rises while a discharge cycle....:

alot of people say to discharge to this or that point, let the battery show you what you should discharge it to. you will see the multimetter reading going down, then actually come up a few hundreds. that is when you hit bottom on that particular battery.
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shakamuni01
Average Member



USA
213 Posts

Posted - June 03 2012 :  03:58:06  Show Profile Send shakamuni01 a Private Message  Reply with Quote
I found this page informative and also leading to some new potential ideas of what things you can do to a battery and what you can't I found the sodium based batteries particularly interesting.
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shakamuni01
Average Member



USA
213 Posts

Posted - June 03 2012 :  04:03:24  Show Profile Send shakamuni01 a Private Message  Reply with Quote
Ooops forgot to add the link:

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49er
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USA
4426 Posts

Posted - June 08 2012 :  10:02:35  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

I found this very interesting, but I can't make it or afford to buy it LOL

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
You must be logged in to see this link.
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shakamuni01
Average Member



USA
213 Posts

Posted - June 09 2012 :  09:07:05  Show Profile Send shakamuni01 a Private Message  Reply with Quote
Speaking of alternative batteries I think I may have created some unintentionally just doing some experiments.... Well not really, but got a 12v battery that was not charging more than 4v and put some baking soda into it and it charged up to 10.5 volta. Then I thought what the hell I will also throw some epsom salts in to see what happens and then the battery voltage started to drop and would not hold much of a charge. Ofcourse I should be more scientific about it and do on thing to one battery at a time. Got a couple more junker ones that I can sacrifice. Interesting thing was the baking soda was making the battery put of a lot of sulfur gas. I know somebody daid that the backing soda ate away his HHO electrolisis plates but I think that may be because it was aluminium and not lead. As you saw from the link above there are types of batteries where sodium suspended in the battery counts as the anode. Anyway something to tinker with more carefully.....
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49er
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USA
4426 Posts

Posted - June 09 2012 :  09:41:36  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

Never never put baking soda in a battery it just kills it. You only put in soda in when you are going to change over to ALUM so you know have a head start on your alum battery. Good luck but do wash it out and then use another soda rinse in it so you get all the acid out

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
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SKYPE bxx49er
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shakamuni01
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USA
213 Posts

Posted - June 10 2012 :  07:43:39  Show Profile Send shakamuni01 a Private Message  Reply with Quote
I see. What exactly happens chemically speaking. Strange because it seemed like it was initially improved until I threw the epsom salts in too.
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msmjr
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USA
444 Posts

Posted - June 10 2012 :  10:19:28  Show Profile Send msmjr a Private Message  Reply with Quote
Hey Guys
All in All Baking Soda NOT GOOD?? But........I may have to retract a statement I made earlier. Check out my last post. You must be logged in to see this link.






Growing old is mandatory, Growing up......optional.
He is wise who gains wisdom from another's mishaps.
—Plutius Syrus
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49er
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USA
4426 Posts

Posted - June 10 2012 :  10:37:04  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

chemically it neutralizes the acid and in doing so cleans the scale from the plates so they are clean it does not repair any damaged parts just makes them clean. Then you can add alum to it and have a alum battery. try this go out to your car and use a tablespoon of soda to a quart of water and put it on your cable connections, it will clean them of any acid. In my grandpa's day that is what they did to keep there post on the battery clean. Just put a little grease on the post before you put it back together.

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
You must be logged in to see this link.
SKYPE bxx49er
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shakamuni01
Average Member



USA
213 Posts

Posted - June 10 2012 :  20:03:19  Show Profile Send shakamuni01 a Private Message  Reply with Quote
Yeah I figuered that, so then after I did that, I tried to add fresh sulpheric acid but to no avail. Also though it could be because they were these small batteries out of scooter and it was very hard to get the liquid out and maybe I didnt get it all out. I.e. it was almost impossible to rinse. Though saying that, I wonder if one rinses it out thouroughly and adds the acid back if it would be a faster way of desuphating. I guess by the time you do that, it seems better to fill up with alum which is less toxic and cheap.
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49er
Administrator



USA
4426 Posts

Posted - June 11 2012 :  12:26:12  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

Never add acid to a battery unless it is new. The best way if you want to wash it out is drain the fluid into a plastic dish,pan and then wash out with a hose BUT ware junk clothes because you will splatter the acid and then you have holes in everything.LOL Wash out 2 to 3 times and the strain the fluid that you took out back into the battery equal in all cells and then Finnish filling with distilled water only and then charge. The Epsom salt that some people have tried and they clam it works BUT the three that I use that on did NO GOOD. So IMHO when your done with the wash out if that doesn't work it is a paper weight.

Doug
The sky is not the limit...There are footprints on the MOON.
Your only as DUMB as where your standing.
No matter where you go there you are.
You must be logged in to see this link.
SKYPE bxx49er
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shakamuni01
Average Member



USA
213 Posts

Posted - June 12 2012 :  21:43:21  Show Profile Send shakamuni01 a Private Message  Reply with Quote
Hmm 49er,

Why do they have hydrometers then.... I was watching a vid where I guy was testing the acid level of each cell and added acid to ones which were were too low. Is the acid there to stop a permanant chemical reaction that would occur without it when the plates recieve a charge?
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msmjr
Average Member



USA
444 Posts

Posted - June 12 2012 :  23:19:31  Show Profile Send msmjr a Private Message  Reply with Quote
Hey Shaka
Don’t know that I can give you a scientific reason all my knowledge is practical.
The specific gravity of the sulfuric acid is used to tell if a battery is charged. For instance
1260 would be fully charged and 1175 is discharged. As you charge the battery the SG will rise. I know that if you take a discharged battery and add fresh acid you’ll never get it to charge, the acid will just boil away.


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shakamuni01
Average Member



USA
213 Posts

Posted - September 08 2012 :  06:54:09  Show Profile Send shakamuni01 a Private Message  Reply with Quote
Hi Guys. Quick question. I have a simple generator that puts out DC and I can adjust that Dc with a DC to Dc converter. If I want to charge a 12v battery in a conventional way off this motor, what voltage would you reccomend I set it at to charge the 12v battery.
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49er
Administrator



USA
4426 Posts

Posted - September 08 2012 :  11:53:53  Show Profile Send 49er a Private Message  Reply with Quote
Hi shak

conventional charge 14.2 volts but don't leave it for ever.

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shakamuni01
Average Member



USA
213 Posts

Posted - October 07 2012 :  22:16:09  Show Profile Send shakamuni01 a Private Message  Reply with Quote
Hi Guys I have a question. I made a savonius rotor out of an old drum and hooked it up to a old electric scooter motor with a DC to DC converter on it. The scooter motor though is pretty beefy and it seems to charge batteries up. However I used it because it was simply around. What to you feel would be an ideal motor. I am trying to get a little web page up documenting how I have it hooked up but for now I can say it is cogged where the shaft rotates a old bicycle wheel and the motor shaft rests on the wheel rotates. Because the scooter motor is a 24v 200w motor I was feeling it would be optimal. Though saying that without the DC to Dc converter the max voltage it puts out is about 9v and generally cruises around 3v. Anyway the DC to DC converter is set at 14.5v to charge up 12v batteries. I was wondering because I wanted to build some rotors out of perspex and make it look slick and see if I can see some at a farmers market.
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