FoxESS Community - Owners & Installers Forum

Good Evening,

I’ve in the last couple of days been transferred to an Eon Next Drive Smart Tariff, which as well as the cheap overnight charging between 00:00 and 07:00, if I use the Next Connect App, using the Tesla API it will now, when electricity is cheap, also give me the cheap 6.7pkwh rate at times between 07:00 and 00:00.

Today has been the first day it’s been utilised, and at 21:30 today, I was charging my vehicle taking advantage of cheap electricity.

However this has thrown up an issue, in the sense that as well as pulling from the grid, it’s also discharging my battery.

I’ve been able to get around this issue overnight by force charging the batteries between 00:00 and 07:00 effectively charging the EV from just the grid.

With the dynamic nature of the Tariff and cheap rates being made available at various, unknown times throughout the day/weeks, is there anyway I can set up the battery in the settings to not discharge to the EV, and for the grid to pick up the entire load?

I hope I’ve described the problem clearly.

Any help, would be greatly appreciated.

Many thanks

The easiest way to deal with this is to make sure the EV charger is connected in front of the inverter so that the inverter does not see it as house load and won’t discharge the home batteries into it. This could require a bit of re-wiring (usually a henley block) to split the feed to the house / EV charger - sometimes you may be able to re-position the inverters CT clamp so that it doesn’t see the EV.

You can set a charge period for the same time as the EV charger is charging with the ‘charge from grid’ disabled, that will not charge the home batteries but will also stop them from discharging as well.

It is possible to use a home assistant to do this programatically whenever it sees the EV charging it sets the battery to stop discharge but there is quite a big learning curve ahead of you there unless you are considering that anyway - which is why I started with the easiest solution is to re-wire it to split the feeds.