[RE-wrenches] Batt Cap AGM

[Sindelar Solar]

Well, Jerry, I guess I'm up to speed now, thanks... It's just that your 
explanation here wasn't what I asked about. I was asking about your 
words that "rotating them reduces the effect [of internal resistance to 
charge and even discharge] and may in time help to improve the battery 
life" - I had not heard this, and I also asked how you rotate strings - 
the order of batteries within a string? Mixing batteries among strings? 
Simply rotating the lead positive cell in each string?

So I ask again - is there an online resource you can suggest, so we can 
learn more?

Thanks, Allan

On 11/21/2018 8:21 PM, jerrysgarage01 wrote:
> Allan
> I have been involved in off grid since the late 70's, l guess l have 
> picked up a thing or two. As batteries age most will require higher 
> voltage to reach the same specific gravity and will have a lower 
> voltage under a load. This is the result of resistance with in the 
> battery. This battery may still be good and just needs a good charge 
> to get it back to a more normal state.
> The entire wire harness from where it leaves the point of charge has 
> it's own resistance, every connection, cable end, wire all of it has 
> resistance and measuring  this is not as easy as you may think, you 
> need to put a preset load on the bank measure the complete circuit 
> voltage, now do the same under charge, measure  each battery note 
> everything and once done with all the seperate banks you can see where 
> the higher resistance is. This is why making all the cables the same 
> length and same size, l have seen some cables soldered to reduce 
> resistance. This in a long round about reason is why fewer bigger 
> banks is better then more smaller batteries. I can continue but you 
> should be up to speed now
> Jerry
>
> -------- Original message --------
> From: Sindelar Solar <Allan at sindelarsolar.com>
>
> Jerry,
>
> You write "I'm sure you know this..." but I don't know it. I don't 
> think I have heard this before, as you have presented it.
>
> How do you rotate strings? Where did you learn this? Is there an 
> online source that you can provide?
>
> Thanks, Allan
>
> On 11/20/2018 6:21 PM, jerrysgarage01 wrote:
>> Wrenches, Drake
>> You may consider contacting "Batcap" and bank if they have a best 
>> practice for the battery configuration, this might be it but at least 
>> a starting point. I have had multi string batteries that seamed to 
>> like being rotated through the bank, sounds like alot of work and it 
>> is but this will swap higher resistance strings for lower ones. I'm 
>> sure you know this but each battery has internal resistance to charge 
>> and even discharge so rotating them reduces the effect and may in 
>> time help to improve the battery life.
>> Jerry
>> -- 

*Allan Sindelar*
allan at sindelarsolar.com <mailto:allan at sindelarsolar.com>
NABCEP Certified PV Installation Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*

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