SteveK
Guru
- Joined
- Jul 5, 2019
- Messages
- 5,889
- Location
- Gulf Islands, BC Canada
- Vessel Name
- Sea Sanctuary
- Vessel Make
- Bayliner 4588
Keith, you have two 160 watt panels and in ideal case they would produce 30 amps, you are getting 19amp due to shading. In our climate on a good day perhaps 5 hours a day would be 19x5=95 amp charge. OK now I can see this working.
How many solar panels does it take to charge a 100ah battery?
Again we use the same calculation dividing power in watts by the voltage in volts to find amps. Charging your battery at 12 volts and 20 amps will take five hours to charge a 100 amp hour battery. By multiplying 20 amps by 12 volts, 240 watts is how big of a panel you would need, so we’d recommend using a 300w solar panel or 3 100 watt solar panel.
Renogy.