Using two UPS to charge battery together?
I need your help with this. I have two UPS (exact same model) Sendon 1000 VA. Each of them use two 12V 10 Amp battery in series. Now I want to use both UPS together to charge a pair of car batteries (12V 35 Amp each).
Is it possible to do so? Using two same model UPS on same battery? I know there is a possibility of power back flow / de-phrasing that may damage the UPS. Please suggest me if I need to use some kind of circuits to keep the two UPS separate.