Robert Landon Posted February 24, 2017 Report Share Posted February 24, 2017 (edited) 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 February 24, 2017 by Robert Landon Link to comment Share on other sites More sharing options...
matty40s Posted February 24, 2017 Report Share Posted February 24, 2017 (edited) 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 February 24, 2017 by matty40s Link to comment Share on other sites More sharing options...
Rob-M Posted February 24, 2017 Report Share Posted February 24, 2017 Blank canvas by the look of it. Link to comment Share on other sites More sharing options...
Robert Landon Posted February 24, 2017 Author Report Share Posted February 24, 2017 opps sorry Link to comment Share on other sites More sharing options...
WotEver Posted February 24, 2017 Report Share Posted February 24, 2017 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. Link to comment Share on other sites More sharing options...
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