We had some hard rain this week.. When the basement started taking water, the pumps were doing their job..
Then, the grid went dead for a few minutes.. It came back on for a short while,
and
went dead again for 3 hours.!.
It was pouring outside and the water kept filling up 2 of the sump holes..
So, I turned on the battery back-up.. It worked great! No basement flooding!
Our neighbors experienced a small amount of flooding, but it wasn't too bad..
I was getting ready to pull out the gas generator (it's due for testing),
but the power came back on.. So I took a nap..
We got some sun this morning, and the 500w array put some AH back into the batteries..