jakepusateri
100K Ohm Resistor
The EVerest project has the CCS charging software pretty much figured out and ready to use. https://everest.github.io/nightly/
They also have reference designs for the control hardware, though they want €1500 for the pre-assembled boards.
The growatt MIN seems to have a really nice range (360-550V) for its HV battery if you could do a little pretending that you're a supported battery. They support LG RESU batteries as well as their own so it's possible. But that voltage is right where you want to charge e.g. a Tesla.
Lastly you'd need a car that supports the ISO 15118-20 standard, which my Tesla does not, probably because they're scared to cannibalize powerwall sales. Where's teddy roosevelt when you need him? From a recent wallbox quasar 2 demo, it seems like the Kia EV9 will support it.
There is however a config flag in EVerest that might be able to sneak power out, elon be damned:
"hack_allow_bpt_with_iso2"
Hack. Allow bidirectional power transfer with DIN spec and ISO-2. Currents communicated on HLC will always be positive but power supply may actually discharge the car.
So let's say 2k in parts minimum assuming you build your own control board and reverse engineer a battery protocol, but it seems at least theoretically possible and it would definitely be a fun project. Wait 2-3 years and bidirectonal EV stuff will be everywhere IMO, probably AC coupled to the house and with MPPTs thrown in for fun since the voltages are just so close.
They also have reference designs for the control hardware, though they want €1500 for the pre-assembled boards.
The growatt MIN seems to have a really nice range (360-550V) for its HV battery if you could do a little pretending that you're a supported battery. They support LG RESU batteries as well as their own so it's possible. But that voltage is right where you want to charge e.g. a Tesla.
Lastly you'd need a car that supports the ISO 15118-20 standard, which my Tesla does not, probably because they're scared to cannibalize powerwall sales. Where's teddy roosevelt when you need him? From a recent wallbox quasar 2 demo, it seems like the Kia EV9 will support it.
There is however a config flag in EVerest that might be able to sneak power out, elon be damned:
"hack_allow_bpt_with_iso2"
Hack. Allow bidirectional power transfer with DIN spec and ISO-2. Currents communicated on HLC will always be positive but power supply may actually discharge the car.
So let's say 2k in parts minimum assuming you build your own control board and reverse engineer a battery protocol, but it seems at least theoretically possible and it would definitely be a fun project. Wait 2-3 years and bidirectonal EV stuff will be everywhere IMO, probably AC coupled to the house and with MPPTs thrown in for fun since the voltages are just so close.
