Hi,
I have a 5kw motor, 240ah bank at 48v. The charger I had at the time output 15a. I knew I was going to upgrade to a 25a charger. Sidenote, USBatttery eng. recommend a charger that can do 20% or slightly more of your amp hours. So the 15a was to small.?
Anyway, I ran the math. 48v at 25a is 1200w. 1200w at 120v is 10a. I found a generator at home Depot that ran 1600w continuous with an RV connector. I ran generator connected to my shore power connection. Charger ran 120v to 48v and then the buss.?
I clamped the battery leads and saw 0a, 15a from charger . Throttled up to say 20a, I'd see 15a from charger then 5a out of bank. Tada motor sailing/hybrid gen.
Kind of a sloppy set up but it worked. To do like your saying about gen to motor you'd need some kind of ac-dc drive. 120v in and 48v out with enough amp out to push you along. I'm powering a 30' Newport sailboat, 20a gets me going assuming I don't have a headwind ect. Think about what your pushing. Is 20a enough? If so you'll need something that can do 20a continous with spurts above that for a minute.
Hope I wasn't to confusing.
