[quote='CharlesHarris' pid='102291' dateline='1527459532']
To run a refrigerator-freezer off battery with solar charging requires a bank of four L16 flooded gold cart batteries
https://www.trojanbattery.com/product/reliant-l16-agm/ Reliant L16-AGM Deep-Cycle Reliant™ AGM
Capacity Minutes_____Capacity Amp-Hours Energy (kWh)
@25 Amps 817_______5-Hr Rate 290
@75 Amps 215_______10-Hr Rate 323
___________________20-Hr Rate 370
__________________100-Hr Rate 392
Length11.66in (296mm)
Width6.94in (176mm)
Height16.41in (417mm)
Weight 114lb. (52kg)
Eight 100-watt solar panels:
https://www.renogy.com/renogy-100-watt-1...lar-panel/
With this size battery bank and charge rate not exceeding C/20 no charge controller would be needed.
CH
Is there really ever a time when you would not need a charge controller?
Ok I can understand that C20 is a large factor if that is the maximum charge rate but the charge controller not only ensures the batteries do not overcharge but also regulates the voltage down to around 13-14.5 Volts. Most solar panels put out between 18-20 volts in peak conditions so that amount of voltage going directly in could damage the battery cells.
The charge controller also ensures that no voltage can leak back into the solar panels and risk damaging them. Though maybe there is something I'm missing or not aware of here?