I'm running a 12v 5x2 - 10 amps total into two banks of 5 amps each. Outlet it plugs into is connected to a 30amp breaker on the main panel. There's other items on that run - lights in the hobby room, outlet for the airbrush compressor, soldering station, Dremel station - but I've yet to trip that breaker...though not everything is run at the same time.
How much does it pull? 10 amps at initial charge, dropping to 1-2 amps when the battery is full and it's on maintenance mode.
Note that a 36v battery needs a 36v charger - NOCO has that, but it's industrial rated and comes in at $600. I'd go with the Dakota Lithium charger - 36v, 8 amps, will charge up a 100ah battery in 12 hours from full discharge (a rare occurrence) for $199. Lithium chargers, like batteries, aren't cheap if you want quality...I wouldn't 'settle' for one of those under $100 chargers from Amazon - don't know what kind of damage they'll do to a BMS.