FoxESS Community - Owners & Installers Forum

Hi, sorry I searched but could not find this issue discussed.

Issue: "Slow Charging Speeds" when house load is high.

Scenario:
- House has 3 phase each circuit 100A
- H3-10-Smart with EQ-4800-L9
- Free Electricity Window 11am - 2pm daily.

Issue:
Battery charges at 9.9kw fine when house load is below 10kw.
If house load is above 10kw, battery will not charge or very low speeds. CT Clamps detect Grid Load as 10kw (at 50A capacity).

I get this is likely a safety thing, but seems it should be able to be increased to 90A (still 10% below the limit of a single phase)

My installer did not know how to fix this issue, other than have high-loads by-pass the CT clamp, but then the battery cannot be used to offset their loads.

Hello,

Your installer needs to speak with Fox support if they're unsure how to set the settings.

I would tell you what to change but it depends on inverter model and firmware version.

I assume they've updated you to the latest firmware and checked the common settings areas?

Will wrote: ↑Fri Oct 10, 2025 8:59 am Hello,

Your installer needs to speak with Fox support if they're unsure how to set the settings.

I would tell you what to change but it depends on inverter model and firmware version.

I assume they've updated you to the latest firmware and checked the common settings areas?

Thank-you for taking the time to reply. I have also raised a support call with Fox. This was the installers first FoxESS 3-phase...

Inverter: H3-10.0-SMART
Firmware: 1.3 (noticed it was updated last week without asking, now supports SOC of 0%, although I have left it at 10%)

Two things I noticed after this post;
- Balance Load: Disabled
- ImportLimitCurrent: 031.9A (~7kw at 220v)

Wild Guess: Given I can charge at 10kw, ImportLimitCurrent must be per phase, so perhaps I am maxing out one of the Phases.

Should I ask the installer to enable "Balance Load" and if that doesn't fix it, perhaps increase the ImportLimitCurrent to something a little higher like 040.0A.

Or am I barking up the wrong tree?