Hey everyone,
I'm dealing with a bit of a bummer here. I have a Solis AC inverter that unfortunately requires grid power to access the batteries. I'm wondering if I could use a 2kW generator when the power goes out and connect it to my house's electrical system with the right changeover switch to make the battery power accessible during an outage. Is this feasible?
3 Answers
Using a 2kW generator probably isn't the best choice, as those are typically only 120V. Plus, you'd need a way to stop the inverter from backfeeding into the generator. Check to see if your inverter has an AC backup port; if it does, you could wire that to a critical loads panel and simplify the setup.
Unfortunately, you can't just use a generator as a substitute for grid power unless your inverter is specifically designed for that. The inverter needs to recognize that it’s being powered by a generator, or you risk feeding extra power back into it, which can cause some serious issues. Definitely something to consider before you go this route.
Yeah, I didn't think about the backfeeding issue! Good point.
Wait, why does your system need grid power to run off the batteries? Isn't that the whole point of having battery backup? It sounds like there might be a controller that requires grid power to function. Can you clarify if your inverter shuts down completely without the grid?
From what I've read, the Solis AC inverter doesn’t allow battery usage when there’s no grid power, which seems strange.
Also, remember that your solar panels won't function without mains power, since each panel's inverter needs that to allow power flow.