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Change the order of how PV generated Elec is used

  • 19-03-2022 10:12pm
    Registered Users Posts: 44

    Hey all

    I have a 22 panel system now producing some nice figures since coming into March with the better weather. The system includes an Eddi and a 5kWh Solis battery.

    On good days, I’m exporting to the grid but because of orientation of house, I produce the majority of electricity before 2pm.

    I’ll be getting an EV car later this year, and would like to allow some of that excess to go to the car. But due to the specs of the plug used for elec cars, it won’t charge with less than 1.4kw coming from panels. (Meaning I would need to supplement the PV production if excess falls below 1.4 with grid supply…open to correction on this, but seems to be what I’ve read)

    So… what I’d like to do is

    — if production is high, and car is plugged in, charge the car for X hours.

    — after X hours, charge the house battery

    — after house battery is charged, let the Eddi kick in.

    Any suggestions how I might set this rule up so that it is an automated process?



  • Registered Users Posts: 10,805 ✭✭✭✭the_amazing_raisin

    Use a Zappi, they're from the same company that make the Eddi and the two can communicate. You can set the priority of which will switch on first

    The Zappi has a setting that will allow to set a minimum amount of power coming from PV when it's diverting. So if you set it to 50% and you're producing 1kW from PV, then you'll take 400W from grid. If you set it to 100% then it'll only divert to the EV of there's a minimum of 1.4kW from PV. You can also program an overnight boost to ensure you have enough charge in the EV no matter what

    "The internet never fails to misremember" - Sebastian Ruiz, aka Frost

  • Registered Users Posts: 10,805 ✭✭✭✭the_amazing_raisin

    Just noticed you want the EV to charge before the house battery. Not sure how you'd accomplish this and tbh I'd recommend swapping them around

    The PV is there to serve the house first, then diverters, then the grid. Charging the EV from solar is best done opportunistically and the focus should be on charging the house battery to meet demands on the evening

    Don't worry, charging an EV at night rates is still vastly cheaper than petrol (especially at today's prices)

    "The internet never fails to misremember" - Sebastian Ruiz, aka Frost

  • Moderators, Home & Garden Moderators Posts: 5,759 Mod ✭✭✭✭graememk

    My energi cant see the status of the batteries, only the power coming from the inverter.

    so without any external "meddling" battery is charged first, and then the eddi kicks in, and once the excess is greater than 1.4kw, the zappi can start.

    If you want to go down the rabbit hole of automation, im sure it would be possible. Using a combination of talking to the inverter to get the status of the battery, some poking with the myenergie api but nothing turnkey.

  • Registered Users Posts: 44 irewestlad

    Super @the_amazing_raisin and @graememk, this has given me great direction. I was aware of the Zappi so it’s the obvious choice for me, thanks for the direction