I have the following equipment and want to know what I need to make this a functional battery backup for a sump pump.
I understand the missing parts are an inverter, a fuse box and a fuse. I referred to this article from Eaton on how to select and install an Inverter-Charger for sump pumps, which has lots of useful information about my exact application. The question I have is, since I already have a charger: can I just buy a sufficient inverter (say 1500 W pure sine wave inverter, to be safe) and use my existing charger? Or does this application require a charger-inverter combination device?
Laying it out more specifically:
- If I have this 12 V, 100 Ah battery, then I hook up a DC-to-AC inverter to it, then on top of that I connect the smart charger to each terminal and plug that into 120 VAC household outlet,
- then turned all the devices on 24/7 and plugged a 120 VAC load into the inverter,
- would I have a backup system that charges and provides power from the grid when that's available but automatically stops charging and starts powering the inverter from the battery when grid power goes out? If not, why or what is missing? Is there a controller in the combination charger-inverter that's missing in this hypothetical setup?