"It's generally not a good idea to place dissimilar batteries in either series or parallel."
Thats what I thought, I want to keep my CPAP battery seperate and wired to the inverter only, last fall
I spent 5 nights out, by the 3rd night my battery was having a hard time keeping up ( I was using it for lights
and a small DVD as well). I was charging with a crappy tire 900 watt generator
and a conventional battery charger, this did not work well.
I need a second battery to watch football games out a the lake ( Go Roughriders!), my satellite box and TV (19"LCD) draw 7 amps, My new plan is to install a battery switch, when charging from the converter with a 2000 watt generater I will put the switch in the both mode this should charge both batteries at the same time.
I was happy to hear the 9245 is a quiet unit I think it will fit nicely in the old inverter box, I didn't want to install a noisy fan in the middle of the trailer. I am going to rewire the trailer with heavier wire and it would be good to know how the old wire was installed, I have searched all over this forum and the net for a 1978 Boler
1700 12 volt internal wiring diagram and so far have come up empty.