Re: Non-Compliant FoxESS installations? (Australia)
Posted: Mon Sep 21, 2026 11:00 am
Yes there is the air gap required underneath.
Mainly as I have a metal cover I designed to protect the battery from rain, sun, muck etc. and in the mistaken hope this would protect the battery from the cold of winter.
When that failed and the internal battery heater couldn’t cope either, I went to the 50mm insulation over the top of it.
As for cell temps I’ve kept a very close check throughout this summer as we have had record heat here.
Surprisingly even when the external air temp hit 39C the max cell temp was 35.8C and min was 31.4C.
As a check I removed the covers for a day and the max temp rose to over 40C, so it appeared to validate that the insulation was working both ways. Conversely, when the external temp dropped to -10C in the winter, the battery maintained a min cell temp of 15C, so the heater never kicked in after the addition of the insulation.
So in the UK the cover can stay on all year, which has really surprised me.
My mate got me to do the same for his EP11 and has had the same results.
The only issue this summer was the inverter overheating and whistling like a kettle, so I’ve installed a couple of 5V USB powered 8” PC fans and that solved the issue.
They will be coming out in the next few days as autumn is arriving and temps are back to normal.
Picture of the battery and inverter covers, with the requested air gaps all round and the fans, built on a couple of wood blocks and it just moves air over the inverter cooling fins, that’s enough to cool the inverter components even if it’s hot air your moving around, it’s a trick we used to use in the early days of servers overheating in data centres that didn’t having enough AC.
Mainly as I have a metal cover I designed to protect the battery from rain, sun, muck etc. and in the mistaken hope this would protect the battery from the cold of winter.
When that failed and the internal battery heater couldn’t cope either, I went to the 50mm insulation over the top of it.
As for cell temps I’ve kept a very close check throughout this summer as we have had record heat here.
Surprisingly even when the external air temp hit 39C the max cell temp was 35.8C and min was 31.4C.
As a check I removed the covers for a day and the max temp rose to over 40C, so it appeared to validate that the insulation was working both ways. Conversely, when the external temp dropped to -10C in the winter, the battery maintained a min cell temp of 15C, so the heater never kicked in after the addition of the insulation.
So in the UK the cover can stay on all year, which has really surprised me.
My mate got me to do the same for his EP11 and has had the same results.
The only issue this summer was the inverter overheating and whistling like a kettle, so I’ve installed a couple of 5V USB powered 8” PC fans and that solved the issue.
They will be coming out in the next few days as autumn is arriving and temps are back to normal.
Picture of the battery and inverter covers, with the requested air gaps all round and the fans, built on a couple of wood blocks and it just moves air over the inverter cooling fins, that’s enough to cool the inverter components even if it’s hot air your moving around, it’s a trick we used to use in the early days of servers overheating in data centres that didn’t having enough AC.
