https://teslamotorsclub.com/tmc/threads/powerwall-2-0-backup-runtime-extender.126358/
I've been experimenting with various micro grid supplements to allow a micro grid to operate longer over night with EV supplements. I have had some success running regular PV panel micro inverters from a 36v golf cart and running 12v grid tie inverters from an imiev's 12v.
But, in testing my Model 3 in the role of 12v power provider, I've failed. It seems the car is too smart to allow the DC-DC to give up more power than is being used by the car. This despite Tesla's reputation of vampire loads pulling down the traction battery. The cars typically lose several miles of range each night. A less than 500 watt 12v external load causes the 12v voltage to decline and the car eventually warns. So far, I've tried running "Dog Mode" overnight in hopes of the DC-DC suppling more power. That also failed with dropping 12v voltage.
When I turn an imiev "on" the battery goes from about 12v to a bit more than 14v indicating the DC-DC is on. In that condition, the car will give up at least 1kw via 12v for long periods of time. With the Tesla, I never see much more than 12v on the battery. I'm tempted to rig a 12v gauge in the car so I can see if that voltage ever goes to "normal" highs of about 14v while driving around.
I seek suggestions for a work around. Has anyone had success pulling significant 12v power from a Tesla? Long term ~500 watts is sufficient.
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