Fox Battery will not Force Charge as the same time as Hypervolt EV Charger.

NickKendall · Mon Jan 20, 2025 3:55 pm

We’ve had our Fox system (KH7 and EP11) since October last year and had a Hypervolt Home Pro 3 Charger installed on Friday. Last night the battery did not fully charge as it did not start charging until the EV had completed which was several hours late according to the force charge window that we have set.

Is this expected and is there anyway to configure the systems so that both can charge at once please? We have a 100amp fuse on our mains supply.

Thanks

Mon Jan 20, 2025 4:42 pm

You will need your K series inverter firmware updated and the import restrictions set correctly. I show these new settings in this video.
Ignore the main topic about grid pressure setting, the settings you want to check with your installer are GridChargeCurrentLimited & ImportLimitCurrent settings.

NickKendall · Mon Jan 20, 2025 5:14 pm

OK great thanks. My ImportLimitCurrent was set to 50.0 and more worrying the ExportLimitCurrent was set to 150.0 (not quite sure how as the range is 2-100). I'm waiting for Fox to respond but have changes both to 95.0 to match your video.

Mon Jan 20, 2025 5:15 pm

perfect

NickKendall · Mon Jan 20, 2025 7:57 pm

On a related theme, when my EV charger was installed they have wired it so that it now drains the EP11 battery when IOG schedules peak rate charging windows and the EP11 isn't set to Force charge. The installer said he wasn't trained in solar and so could not add it as a separate circuit before the main house and solar circuit, i.e. straight after the tails coming out of the meter in the attached photo, but that should be simple shouldn't it?

Mon Jan 20, 2025 9:28 pm

NickKendall wrote: ↑Mon Jan 20, 2025 7:57 pm On a related theme, when my EV charger was installed they have wired it so that it now drains the EP11 battery when IOG schedules peak rate charging windows and the EP11 isn't set to Force charge. The installer said he wasn't trained in solar and so could not add it as a separate circuit before the main house and solar circuit, i.e. straight after the tails coming out of the meter in the attached photo, but that should be simple shouldn't it?

Yes, a henley block on the tail straight after meter where the white CT clamp is.

I must admit I wouldn’t have wired any of it the way it is - so just to confirm i’m reading it right, bottom left is the feed to the EV charger, bottom right is the solar inverter and the feed through the 100A double pole switch through the backboard is going to the house consumer unit ?

NickKendall · Wed Jan 22, 2025 9:00 am

Hi Dave, thanks and yes that is correct.

How would you wire it please?

sharpett · Sat Jul 19, 2025 8:13 am

Sorry to revive this old thread but I am having a similar issue where my battery will not charge during the force charge period until my EV charger (zappi) is done.

Not an issue other than when the car charges through the whole force charge slot and I can see it being more of an issue in winter where the ASHP runs through the same slot as well.

I have an H1 hybrid inverter with the firmware numbers below.

I looked on the fox ess website but could not see how to access the same settings you noted in your video - is installer access required for this?

Many thanks

1.35 master
1.03 slave
1.52 comm

Sat Jul 19, 2025 2:48 pm

sharpett wrote: ↑Sat Jul 19, 2025 8:13 am Sorry to revive this old thread but I am having a similar issue where my battery will not charge during the force charge period until my EV charger (zappi) is done.

Not an issue other than when the car charges through the whole force charge slot and I can see it being more of an issue in winter where the ASHP runs through the same slot as well.

I have an H1 hybrid inverter with the firmware numbers below.

I looked on the fox ess website but could not see how to access the same settings you noted in your video - is installer access required for this?

Many thanks

1.35 master
1.03 slave
1.52 comm

Must admit I didn’t think the H1 (Gen2) inverter had the import limit setting (unless it’s been sneaked into the settings recently), either way it is definitely an installer only option.
Is there any other demand limiting device in your home, do your batteries not charge at all or just at a low rate ?

sharpett · Sat Jul 19, 2025 4:35 pm

Thanks Dave

I've looked back through a few overnight charge slots and it doesn't charge at all when the car is charging but does charge when the ASHP runs (hot water only at this point!).

If there is no way to limit it, the "fix" I think will be to set a charge slot for the car which ends 2 hours before the force charge slot to ensure the 10kwh home battery charges before the end of the force charge slot. Not ideal but not a deal breaker given the mileage we do. Any other ideas?

As a noddy question, why does this happen? The 100amp house fuse (single phase) should be able to manage car charging (7kw), battery charging (5kw) and ASHP (3kw max) at the same time so why does the inverter throttle this at all?

Thanks

Sun Jul 20, 2025 10:36 am

That’s a good question, it certainly has all the hallmarks of the inverter limiting the charge because the load is too high - so a quick question, does your car chargee get seen as house load by the inverter when it is charging ?

sharpett · Sun Jul 20, 2025 8:51 pm

Thanks. Yes it does which is another problem given the interaction with octopus IOG smart charging I am getting the EV charger installer back to rectify. Do you think that could fix the issue?

Mon Jul 21, 2025 9:05 am

Yes definitely, your main fuse is plenty big enough to cope with all your loads, once the EV charger has been moved on the ‘grid-side’ of the inverters CT clamp it cannot be affected by anything the EV charger does.