I am contemplating putting a grid-tied solar system in my house with battery backup. One benefit of doing this is that the battery can put out steady 110 volt power which would be fantastic for my stereo amplifier. High end amps sound much better without external load-tied voltage fluctuations. My question is whether I would have to go off the grid entirely when I want to listen to the system with this circuit, or is it possible to keep the rest of my house on the grid and simultaneously use this battery powered circuit for stereo at night. I suspect it's not possible; I'd have to use all one or all the other but I am out of my depth here. Thank you!

I left the battery connected throughout the winter by mistake. The water levels seem fine. however, at first the smart charger just registered a fault, I left out the on the power supply setting to try and get some voltage in. On connecting a meter it reads 1.6V but then immediately drops to 0. The charger no longer registers a fault but it thinks it is at almost 100% capacity so I left it on trickle charger overnight but still not getting any voltage reading. Anything to try?