Charging Parameters

[@Mandalaman]

thanks!! these are very informative. Especially for a DIY'er

[@ChrisWilson999]

What kind of efficiency costs would be associated with *per cell* charging for each 2V cell in large arrays? For instance each tracking PV bank would have each PV cell supplying a small CCCV circuit converting the solar cell voltage to the correct CCCV voltage. With proper PV sizing and high efficiency buck converter, it seems like you'd never have balancing issues *and* have good efficiency.

[@RollsBatteryEngineering]

Generally any flooded battery will lose about 10% with no load per month... while VRLA Lead batteries lose about 2-4%... This is with no load... When you load them, with AC loads you also get the inefficiency of the inverters... WIth DC loads you see only about .05% inefficiencies... Where the largest Inefficiencies are is when you enter the absorb charger mode... at this point 80%+ SOC the Lead based batteries charge at only about 20-50% depending on where you are in the stage.. For your case you just need to design it to charge at above what the assumed losses are and what the battery needs to get to full. Generally If you pull out 100 Amps you have to have enough solar to put back 120Amps...

[@Bacardibombillo]

Dude you helped me out a lot...

[@RollsBatteryEngineering]

Thanks! If you have any questions please feel free to email me directly!

[@vikasgupta9052]

I have a 12v 170ah flooded lead acid battery C 10 rated. I charge with a solar charge controller. My controller charges the battery @ 8 to 45 amps. Can high current damage my battery? What is the ideal current for charging my battery?