FoxESS Community - Owners & Installers Forum

Hey,

I am looking to install new solar system and I have received a good proposal, the installer recommends to install 2 Inverters 1 Fox ESS 1 x KH10 to cover 3 different roofs with 6 PV on each side house and 1x FoxESS F Series 3.6kw Inverters for garage roofs.

Now i am getting bombarded with solar companies trying to get my business and some are telling me that the 2nd Inverter will not charge the battery and would also need to be a hybrid Inverter ? Installer told me that smaller F series Inverter will be sync with the hybrid and both will charge the same battery system.

I am going with 2x Fox ESS EP11 10kw batteries for the system. I think it will all be sync and should all work if installed at the same time right ? Also some are telling me that I will be fine with just 1 Inverter, because my roofs are facing the same orientation as on the house and garage ? I have attached the layout for better visualization.

So two questions really, do I need 2 Inverters and will both charge the batteries and if I can get away with just 1 Inverter (1 x KH10 ) ?

Thanks for all

Hello,

Good news, the KH10 with two EP11 will also be able to charge from surplus solar generated by your garage string only inverter. Those installers who say it won't work clearly don't know what they're talking about.

So to confirm, go with one KH hybrid with the two batteries connected and the F series string inverter for the solar only array, which WILL be able to see seen by the KH and hence charge the battery. I personally do this and have done a lot of installs with a combination of string and hybrid inverters working great.

Hi Will, I am in a bind due to G99 restrictions in the UK looking into a similar albeit smaller set up -

I am planning a 5kw H1G2 with 2 EP6 batteries with 2 strings (East/South facing arrays) and 1 S2500 string inverter with a west facing array.

Will this work OK (ie the H1G2 will use generation from all 3 roofs and deliver from battery storage to support loads?

Both inverters will be supplied from the same AC circuit.

Quick question on dual setup: In similar fashion I want to do the same as the above post, I have got a H1-G2-5kW covering the house arrays, but I would like to add a garage roof F series inverter with 5 panel PV array either side. But my max export rate is G99 limited to 5kW, how do I set that across both inverters so they both don’t go over the 5kW limit combined? TIA.

When you have a hybrid (or AC) running with a second solar only inverter, this isn’t what you would describe as parallel mode. Parallel mode is where you have 2 hybrid inverters that each want to be in control of the loads, without them being connected in parallel mode they will fight continuously. For parallel (the inverter must support that feature i.e. gen 2 H1 and KH), there is a physical ‘parallel’ comms connection between them and only one of them has the meter (or CT). It shares that information with the second hybrid inverter and they will load balance across themselves as needed.

So back to your question (last 2 posts)

When a hybrid inverter is running with a second PV only inverter, you have to connect a second CT to the CT2 connection of the hybrid and the CT clamp is clamped to the live feed from the second inverter.
The Hybrid inverter then has the information it needs to calculate the load correctly and if there are any export limits set the hybrid will throttle itself to reduce it’s output to ensure the G98/G99 DNO limit cannot be exceeded.

@ADJ - as long as the CT2 from the H1G2 is connected to the live feed of S2500, it will work fine and will use any excess solar that is being exported (from either inverter) to charge it’s batteries.

@aaron as above connect the second CT to the F series and set an export limits on the H1 G2 to your 5kw limit - the hybrid will measure the absolute export being generated by both inverters and will use as much as possible to charge it’s batteries and it will not allow the export power to exceed 5kW by throttling it’s own PV (with only 5 panels the F series will simply output at full power).

Dave Foster wrote: ↑Fri Jun 12, 2026 6:50 pm @aaron as above connect the second CT to the F series and set an export limits on the H1 G2 to your 5kw limit - the hybrid will measure the absolute export being generated by both inverters and will use as much as possible to charge it’s batteries and it will not allow the export power to exceed 5kW by throttling it’s own PV (with only 5 panels the F series will simply output at full power).

Dave, thank you that is exactly what I needed to know! I wish I had space and infrastructure to support another H1 and additional batts to parallel but sadly I do not so limited in what I can fit.

We have a similar query but with slightly different setup; can I check how it will work please? We also have a 5kW G99 export limit.

Our system has an F5000 solar pv inverter, to which we later added a separate 5kW AC1-G2 inverter with EQ4300 stack. (It was our choice to go with the second inverter and not change to a hybrid). Works brilliantly.

We now plan to add into the consumer unit another 2kW of panels on a garden office roof with its own string inverter (F3000 probably).

Will the house simply see the new inverter as just more available solar power? Or not see it? or need configuring differently? Or need a new G99 ..?

skipsolar wrote: ↑Mon Aug 17, 2026 12:27 pm We have a similar query but with slightly different setup; can I check how it will work please? We also have a 5kW G99 export limit.

Our system has an F5000 solar pv inverter, to which we later added a separate 5kW AC1-G2 inverter with EQ4300 stack. (It was our choice to go with the second inverter and not change to a hybrid). Works brilliantly.

We now plan to add into the consumer unit another 2kW of panels on a garden office roof with its own string inverter (F3000 probably).

Will the house simply see the new inverter as just more available solar power? Or not see it? or need configuring differently? Or need a new G99 ..?

This is a more complex one than you might have thought, to start with the regulatory side - yes you would need to re-apply for G99 with the new design as it is capable of exceeding the current export limit.

The complexity of the next part depends very much on how much you rely on the stats produced by the AC1 hybrid, it should be installed to monitor the F5000 inverter via a second CT clamp and will then be able to calculate load, grid consumption etc... - if you were to add another F3000 inverter as you have already used CT2 for the F5000 the AC1 would not be able to see the extra generation and so would miscalculate the load (but it would still be able to sue all excess solar to charge, and would power the house correctly in the absence of solar).

Simpler solutions to the adding of an extra inverter would be to replace the F5000 with a G8 inverter which has 3 MPPT's , that would be more efficient and if your DNO imposes a lower export limit than the (5+2=7kw) it allows the G8 inverter to manage the agreed export limit. This would also work well with your existing AC1 inverter as CT2 would be monitoring the output of a single inverter which is what is is designed to do.

Another arguably easier (but more expensive) alternative is to replace the F5000 and AC1 with a single KH7 hybrid inverter, the KH7 has 3 MPPT's and battery inputs so you would have only 1 inverter controlling it all - if you still have expansion space for extra panels you could change that to a KH8 or bigger with 4 MPPT's.

Swings and roundabouts really as to what is best, probably only you can answer that - but you will need to have some early dialogue with your DNO as if they refuse to approve a larger export limit your options are more limited.