How to use ev as battery backup but also charge ev with excess solar? Off grid!

[Mark D]

I'm about to start living in my off grid home and I want to get and EV eventually. I realize I would need v2h capabilities, let's assume i have this.

How do I go about doing this? I know my 6500ex's aren't capable, but what could I add to my system to achieve what I want to do? I would not mind running a dedicated circuit(s) for the ev(s) to make it work. Ultimately i want my house and house battery to be able to charge from my EV, but also to charge the ev from my PV system when the house battery bank becomes full. Basically I want to prioritize my usage from solar, ev, then my house bank. But i want to prioritize charging my house bank, then my EV. Yes I realize my EV battery will lose range from doing this, but that is the entire point of why I want it to work this way. I have many vehicles and don't need to drive the ev every day and I'll probably get two anyways but I'd want both to be setup the same way with the possibility to charge one from the other (without direct plug in to each other) under certain circumstances. I love the idea of charging my car at a public station (many are free around me) and using that energy to power my house and charge my house battery, especially during stretches of clouds and pretty much eliminate the need to run a generator ever.

I researched it a bit and supposedly using a grid tied inverter and using the car as the grid is not safe but I don't understand why. That seems like the obvoius, cheapest, and easiest solution to me...TIA!

 

[DIYrich]

Some EV's have a 120v socket. You can use that with a chargeverter to charge your home battery directly (although very slowly).
You can also use that for Level 1 charging of another EV.

You can use the Smartport of the Inverter to only turn on when there is sufficient battery to turn on a Level 1 or Level 2 charger for an EV.

An EV with V2H would give you additional capability to send power to the House, and possibly higher power to charge another EV faster.

Ford F-150 has touted the ability to charge another EV

There are ways to tap into the high voltage battery directly to charge your home battery.
If you are comfortable tapping into the high voltage battery, you might want to consider a plug-in hybrid. The ICE can be your "backup generator".

 

[BlueMarblePA]

I don't have this system, but it seems intriguing. Wallbox Quasar can be used as an EVSE and a V2H. If you pair it with a Kia EV9, you can do both.

The Wallbox system is interesting, because you can add CTs to measure consumption and thus slow down charging your EV if the load in your house suddenly goes up because you turned on the dryer.

Introducing Quasar 2: Exclusive Partnership with KIA - Wallbox

Experience the future of the Kia EV9 with the Quasar 2 charging solution. The innovative collaboration between KIA and Wallbox is here.

wallbox.com

https://www.cars.com/articles/kia-announces-wallbox-quasar-2-vehicle-to-home-charger-for-ev9-505745/

 

[Mark D]

Some EV's have a 120v socket. You can use that with a chargeverter to charge your home battery directly (although very slowly).
You can also use that for Level 1 charging of another EV.

You can use the Smartport of the Inverter to only turn on when there is sufficient battery to turn on a Level 1 or Level 2 charger for an EV.

An EV with V2H would give you additional capability to send power to the House, and possibly higher power to charge another EV faster.

Ford F-150 has touted the ability to charge another EV

There are ways to tap into the high voltage battery directly to charge your home battery.
If you are comfortable tapping into the high voltage battery, you might want to consider a plug-in hybrid. The ICE can be your "backup generator".

Many cars can do v2v such as the lucid air but nothing you described is what I want to do. I want to plug in one cable and have that work to charge the car at a specified house battery level then to charge my house from the car at a different specified house SoC and to stop at a specified car SoC, all from one cable.

I don't have this system, but it seems intriguing. Wallbox Quasar can be used as an EVSE and a V2H. If you pair it with a Kia EV9, you can do both.

The Wallbox system is interesting, because you can add CTs to measure consumption and thus slow down charging your EV if the load in your house suddenly goes up because you turned on the dryer.

Introducing Quasar 2: Exclusive Partnership with KIA - Wallbox

Experience the future of the Kia EV9 with the Quasar 2 charging solution. The innovative collaboration between KIA and Wallbox is here.

wallbox.com

https://www.cars.com/articles/kia-announces-wallbox-quasar-2-vehicle-to-home-charger-for-ev9-505745/

I'll have to look into that ev9. That system sounds pretty good