Have one of these and they frequently go on sale for around $650. Super quiet and more than enough power to do anything you could need as far as charging goes. Also it has electric start and both 120v AC and 12v DC.
3500 Watt Super Quiet Inverter Generator
Used ST-16 controller for sale. Great shape except the avoidance switch is broken off. Happened during shipping to me and I just use a pen tip if I ever even use it. Otherwise works perfectly. $200 plus shipping in 48 states. Thanks for the space!
Hello. New to the site. So how long CAN you keep them charged if just waiting for good flying days? A week? Alot of times with me it's spur of the moment and waiting to charge batteries isn't ideal.