About WattRescue

I'm a network administrator and developer in northern Vermont with about thirty years in IT. I drive a Tesla, I keep a generator for outages, and at some point the obvious question came up: can one charge the other?

It can. But the useful details were scattered across forum threads, contradicted each other, and mostly came from people who hadn't done it. So I started measuring and writing it down.

What makes this different

Every number here comes off hardware I own. When I haven't tested something, I say so. When I get something wrong, I correct the page rather than quietly deleting it.

The rig

• GENMAX GM10500XiT open-frame tri-fuel inverter generator — 7,800W running on gasoline, under 3% THD
• Factory twist-lock bonding plug, installed and verified
• NEMA 14-50R to Tesla Mobile Connector
• Tesla Model Y
• Vermont winters, which is why the cold-weather numbers here aren't guesses

Contact

Questions, corrections, or a measurement that contradicts mine: hello@wattrescue.com. Corrections especially.