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battery bank / banks


Robert Landon

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hi all , need your help and advise to see if I am going in the right direction or just going mad , with ref to battery bank / banks.

I know lots has been posted about this so please bare with me .

as you all know electrical and electronic gear and batteries  are  expensive , in fact outrageous , so I got thinking , that if I put minimum strain on the batteries for example  low discharge and low charge / cycle  rates they may last many more years .

so here is the question / idea , lets say I brought 10 x 12 volt  reasonable quality 100 ah c20 batteries wired in parallel and series to give me a 500 ah 24 volt battery bank , lets call this bank no 1 , all 240 v ac and 24 v dc are drawn from here but no charge from solar or wind , I then set up another  battery bank , lets call it  no 2 or sacrificial battery bank with 4 x 12 v 225 ah c5 much cheaper batteries , given me 450 ah at 24 volt , charged from solar and wind through mppt and mpw charges , the inverter from this bank would supply 240 v into bank no 1s  inverter/ charge as if was from shore / generator power , the idea been that the expensive batteries would be on a near constant float charge .

this seems more cost effective to replace 4 cheaper batteries but not sure if it will work .

any thoughts

many thanks

Robert

 

 

Edited by Robert Landon
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You are spending an awful lot of money on something that should be viewed as a disposable.

You may well find that the solar/wind bank of batteries last longer than the others as they never reach a state of "nothinghappeningness" , meaning they don't sulphate to any great extent.

Charging one bank from another bank is very inefficient anyway.

Edited by matty40s
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Batteries are disposable. Treat them as well as you can and they will give you a decent life.

Discharge them by more than 30% DoD (and less than 50% DoD for 'normal' batteries) and recharge them daily to close to 100% and they'll last you several years. Vary from that much (especially the daily charge to 100%) and their life will be concurrently shortened. 

More batteries should simply be put in parallel to make a bigger bank. Battery to battery charging is inefficient. 

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