Solar generator battery charging with Tesla

[dykdidyouknow]

Ignoring warranty voiding of the Tesla:

I have a solar generator built in a toolbox with 100ah LiFePO4 battery that usually charges from a 200w solar panel just for a little bit of portable backup power for camping or to run a fan/heated blanket in a bad weather power outage.
My question is could I safely recharge that battery using my Tesla? I was thinking just hooking the 12v battery in the car to it and letting them balance could work, but the LiFePO4 is actually a 14v so maybe not.

maybe I could run the 12v battery in the car through the solar dc input on my charge controller?

I want to do this to be able to carry my power back inside my house, and I don’t want to run an inverter off of the car because that seems like it can cause damage. I’m hoping a controlled charge via my Victron charge controller would be nicer to the battery (and I can control exactly how much I’m pulling from the battery)

 

[Samsonite801]

You could use a DC-DC charger... Like the Renogy or Victron ones, advertised for RV main chassis battery/alternator to house bank lithium charging... They can take a wide range of input from 10-16v or something (from the Tesla 12v battery circuit), and output a correct charge curve to manage charging a LiFePO4 12v bank...

Examples:

12V 20A DC to DC On-Board Battery Charger

The best 12v battery charger. Free shipping. The DC-DC Battery Chargers are the most effective method to charge your home batteries from the starter battery

www.renogy.com

New Product: Orion-Tr Smart DC-DC charger - Victron Energy

The new Orion-Tr Smart DC-DC charger is designed for use in dual battery systems in vehicles or boats, where the (smart) alternator and the start battery are used to charge the service battery. The model range is suitable for 12V or 24V systems, and both lead acid and lithium batteries. Why do...

www.victronenergy.com

And hopefully you weren't meaning to use the HV battery to directly charge (using a SCC), were you? That gets into bigger obstacles, like voiding the Tesla warranty and such (as it would require a main battery tap connection)...

 

[dykdidyouknow]

You could use a DC-DC charger... Like the Renogy or Victron ones, advertised for RV main chassis battery/alternator to house bank lithium charging... They can take a wide range of input from 10-16v or something (from the Tesla 12v battery circuit), and output a correct charge curve to manage charging a LiFePO4 12v bank...

Examples:

12V 20A DC to DC On-Board Battery Charger

The best 12v battery charger. Free shipping. The DC-DC Battery Chargers are the most effective method to charge your home batteries from the starter battery

www.renogy.com

New Product: Orion-Tr Smart DC-DC charger - Victron Energy

The new Orion-Tr Smart DC-DC charger is designed for use in dual battery systems in vehicles or boats, where the (smart) alternator and the start battery are used to charge the service battery. The model range is suitable for 12V or 24V systems, and both lead acid and lithium batteries. Why do...

www.victronenergy.com

And hopefully you weren't meaning to use the HV battery to directly charge (using a SCC), were you? That gets into bigger obstacles, like voiding the Tesla warranty and such (as it would require a main battery tap connection)...

I have no interest in touching the HV system haha. Thank you for the links I didn’t know these existed.

 

[Samsonite801]

I have no interest in touching the HV system haha. Thank you for the links I didn’t know these existed.

The reason I had asked is because I did run a wire tap onto my Prius HV battery for a 5kW inverter in the trunk, so it is not outside of the realm of possibility, that's all. It's not necessarily a mod for everyone though. Mine is still under warranty ( I guess until they find out I did it?)..

I've had it back to the dealer a handful of times for normal servicing and they've never asked about the big heavy equipment in the trunk and I guess they never saw the 8 awg wire coming out in the hatchback from under the carpet...

 

[dykdidyouknow]

The reason I had asked is because I did run a wire tap onto my Prius HV battery for a 5kW inverter in the trunk, so it is not outside of the realm of possibility, that's all. It's not necessarily a mod for everyone though. Mine is still under warranty ( I guess until they find out I did it?)..

I've had it back to the dealer a handful of times for normal servicing and they've never asked about the big heavy equipment in the trunk and I guess they never saw the 8 awg wire coming out in the hatchback from under the carpet...

That’s pretty awesome! I don’t want to Risk voiding my warranty… yet

 

[time2roll]

Fairly certain the Tesla converter will put 80+ amps into the 12v system if you turn the car on. Easily drive that DC-DC converter linked above.