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Has anyone experiences with using an electric-car as home battery. Although not all cars are suitable for a bi-directional connections, i am curious to know if their is already some experiences with this. In addition how to connect it in combination with a 3-phase Victron Multi plus II setup?
Vehicle to Grid (aka V2G) still seems to be experimental and so not very many car have this capability.
Theoretically, V2G capable vehicles could be AC coupled to the AC Out of a MultiPlus and supply loads and house battery charging that way.
I'm not sure on how V2G is to be controlled, the idea being that the network operators can somehow summon energy from cars whose owners have agreed to participate in assisting when demand is high. No idea if the vehicle owner could control this.
Let's talk about V2H (vehicle 2 home) , thus the power stays behind the meter.
Can I let the MP2 connected to the grid and plug the car battery (Li-Ion: 48VDC) to the battery pole, once I come home ?
Are the MP2 48VDC stable w/o battery or do I need to have a "resistor" or a small battery still connected ?
Sure, I need to have a kind of hardware "interface" and cerbo gx for control logic.
Anyone out, who tried it out ?
One of the problems with using your car's battery as a home batter - or as an extension to a home battery is the operating voltage, car batteries are 380 - 800V, and so are incompatible with low voltage systems. The DC charging port (fast charge) does allow direct access to the battery though, so can be used for discharging.
On the practical side though, this will increase the wear on the car battery - which is more expensive to replace. It will also leave the battery in a uncertain state of charge when disconnected. On disconnection, the house system becomes reduced in capacity.
There are some Chinese inverters that do allow this, though.
I know some of the trucks have fairly large inverters. Would these get involved in providing home power? That is, AC coupling the inverter output to the home energy system?
I am trying to follow what Marc at https://www.switch-ev.com/ is doing but I am not sure it is production ready yet… although it all sounds very nice and they are taking a good open source approach so it may work in the end…
Here we go:
Installation for V2H with Twizy (48VDC) and MP2 3000 is working fine !
1. challenge was - direct access to the battery: solved and fused.
2. challenge was - start-up sequence for MP2: The moment Twizy is connected, internal capacitors are charged via resistor. After a short time Cerbo-S closes a) a contactor, b) closes the remote control bridge and MP2 powers up.
3. challenge was - how to disconnect a running system: Pressing a buttom initiates a "power shutdown", thus pulling the connector happens at low power.
Programmed with Node-Red.
Summer isn't the best time to test V2H (long days, short nights with low power consumption). Autumn, starting with Oktober will show more interesting results. During night times V2H will be disabled and "normal" home storage will power the house.
