Help sorting this out!
Good Morning, I have a simple ( I think) question that I cannot quite get straight in my head. Here goes... In my RV, I have a nice solar system comprised of a roof panel, charge controller and: (2) - 6 volt 220 AH AGM Batteries wired in series to make a 12V 220AH bank. (1) - 3000W Pure sine Wave Inverter. I also have a generator to use when needed but my question is this. I have a 6 gallon water heater that draws 1550 Watts and 14 Amps. When I want to heat water, I bypass the solar system and turn on the generator for 30 to 40 min . For curiosity's sake, I decided to run the Water heater off the batteries / inverter. When I did this ( with a fully charged battery bank), my charge controller read that the battery bank voltage was dropping to 11.8v while the inverter was reading a 1560Watts of output. I wasn't sure what to make of this so, after about 30 sec, I stopped using the batteries for the WH . The voltage reading on my bank rebounded to 12.7 as soon as the inverter was turned off and the load removed. While not totally necessary (because I have a generator) I would think my fully charged battery bank would be able to handle a 14 Amp load for 30 to 40 min. Is it normal and OK to see the battery bank voltage drop like this during a heavy load draw? Thanks in advance