For those that are much smarter than me would it be possible/practical to use the new Enphase Bi-Directional Charger with an EV battery that has been taken out of a car? Since a battery emulator has been successfully done for EV batteries (Dala's EV Repair) could you make the Enphase charger think the battery is still in the car and can use it as the backup power source? Seems like Enphase is getting closer to releasing their system and wondering if it might be worth the time to go down this rabbit hole.
Enphase Bi-Directional Charging and EV Batteries
- Thread starter STxFarmer
- Start date
yabert
Solar Addict
Why not?
A lot of communication / ctrl to do, but this should work. Maybe add some hardware like charge port/junction box, etc depending of battery choice (Tesla, Kia, GM, Ford).
This is to see. I've wait for more than a decade now that someone sell Bi-Directional charge station.
Many prototypes and nice web sites from different company, but I never see real product available for everyone.
And now with NACS standard who will gain over CCS in 2025, I think you can wait few more years before putting your hand on bi-directional charge station.
DIYrich
Solar Wizard
Me thinks, in addition to the Battery from the Car, you need the bi-direction charging circuit of the car.
yabert
Solar Addict
Well, that can be negotiated.
Highly depend on the level of hacking you can do.
zanydroid
Solar Wizard
Not sure why you would bother with bidirectional standard on a bare EV battery. Just use one of the projects that proxies an ESS BMS on top of the EV modules, and connect a HV inverter
For my Enphase system it would allow it to all work together as it is intended to work. Enphase batteries and the controller are not cheap at all. The Enphase Controller would be needed for any battery system. Thinking the upfront cost for the Bi-Directional Charger and the EV battery would be much cheaper than the Enphase batteries of the same capacity. Especially if you went with a 40kWh battery.
zanydroid
Solar Wizard
This makes more sense but IMO is still poorly founded
I doubt you can avoid System Controller/the new meter collar with this approach. Since there are some critical islanding/grid forming functionality there. You are implicitly assuming the bidirectional charger has these packaged in; if so IMO they would jack up the price accordingly
You can likely buy a HV battery hybrid with built in MID for the same cost as a System Controller and AC couple the Enphase micros into that.
And note all configs under discussion would not be code compliant unless you beat your state’s adoption of the latest UL9540 and auto ESS clauses. Unless you can comply with the placement requirements for recycled EV battery exemption.
I doubt you can avoid System Controller/the new meter collar with this approach. Since there are some critical islanding/grid forming functionality there. You are implicitly assuming the bidirectional charger has these packaged in; if so IMO they would jack up the price accordingly
You can likely buy a HV battery hybrid with built in MID for the same cost as a System Controller and AC couple the Enphase micros into that.
And note all configs under discussion would not be code compliant unless you beat your state’s adoption of the latest UL9540 and auto ESS clauses. Unless you can comply with the placement requirements for recycled EV battery exemption.
Yes could think of no way to avoid using the System Controller as stated. But your answers give me direction to pursue and that is what I am looking for, more knowledge from people that know a lot more than I do.
Capt Bill
Sailing Options
Wondering what an ESS BMS is .. ??? And if you have a web link for a HV inverter. Do you have any specifics for an example? Asking because I am Curious about options for using EV battery voltage to power up a house solar battery system in cycles of no grid plus no sun periods. Power could be via conversion for charging a 48 vdc LiFePO4 Battery Bank powering house ac loads, or might possibly happen by converting EV Battery Voltage to 240 vac. Looking for the specifics including specific equipment in this arena. Any educational leads will be appreciated.
zanydroid
Solar Wizard
Sorry, I’m not quite sure where to start helping you. Can you decompose the problem/restructure the question?
There’s no solution from components, that don’t require more expertise than 99% of this forum has. So there’s a limit to how much help I can give anyway
There’s no solution from components, that don’t require more expertise than 99% of this forum has. So there’s a limit to how much help I can give anyway
yabert
Solar Addict
Kind of what I (and others) doing by connecting EV battery to MPPT input of a controller.
Capt Bill
Sailing Options
I am Curious what voltage EV battery are being hooked up to MPPT inputs ? And WOW ... You and others are charging done or more 48 volt LiFePO4 Battery Banks via this method with the proper MPPT controller ? N... I just recent got more interested in this topic. I am intrigued to learn more specifics, and will use this forums search engine. If anyone has a thread to recommend, I would check it out. I have been wondering how to send maybe 350 vdc from an EV battery to the home solar system battery, and this looks like an economical best way option.
yabert
Solar Addict
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