Most reacted posts

Well for one, 10 volts on a 12V battery is not good (no matter the battery type). Sounds like you need new batteries for starters. You need a charge controller to connect the panels to the battery.

I'm building my first off grid system to play around with. I have the 48V Growatt all-in-one inverter listed in the title. It is supposed to be able to run off solar only with no batteries attached. I will add a battery in the future (I have one on backorder). I have 8, 12V 100w panels...

Do you have a specific question? All your components seem to work together. Probably put the panels in 2S2P.

Electric water heaters draw around 4500 watts. Electric stoves draw up to 2500 watts per burner. Up to 4000 watts for an electric oven. My tiny mini-split AC draws 450 watts. You could run one of each appliance at a time with 6000 watts worth of inverter. You wouldn’t have much power left over.

At a very low load like that, the fans would be at idle. They are still audible if you are standing next to it. The fans ramp up pretty quickly as load goes up and they are pretty loud.

Question. I have the Growatt all in one that can work with no battery. The unit turns on when it receives power from solar or grid when the inverter switch is off. Do I need to do this precharge when I add a battery?

Interesting. I will try adding another 12v panel tomorrow. Today, I tested by putting a roughly 250 watt load on it. With it connected to grid power, it stayed in AC Bypass. 0 amps from PV and 2 amps from grid. I then disconnected grid power and then PV went to 2 amps. When I turned grid power...

Update: After leaving it overnight, it started working as expected this morning at dawn.