Inverter is over reporting the Grid Exports as compared to what Electricity provider is telling me
Posted: Sun May 10, 2026 5:02 am
Hi,
I installed the Solar + Battery system a month ago and have been analysing the data over the past month and something feels off.
System details.
Solar: 13.3kw
Inverter: FoxESS KH10 (KH series, 10 kW single-phase hybrid inverter)
Battery: Make/Model: FoxESS EQ4800-L9, Total capacity: 41.93 kWh
I am with Amber (joined a week after the installation and joined their SmartShift VPP, still in learning mode).
I have Home Automation integration also with my system and I keep an eye on the data regularly to see if everything is ok.
I noticed a couple days after joining Amber that what FoxESS app tells me about the amount that I export to the Grid for that day does not match with what Amber is telling me. a little bit of difference is fine but the difference wht I have been seeing is huge.
I exported the inverter data for the past 10 days, got the usage data from Amber and compared the 2. Her's my findings.
The import numbers look perfectly fine but the export numbers are wrong. The inverter is over reporting the export numbers by almost a factor of ~ 2.73x consistently.
Something is wrong. I have asked my installer about this but also wanted to post here to see if others faced this issue what this possibly could be?
I installed the Solar + Battery system a month ago and have been analysing the data over the past month and something feels off.
System details.
Solar: 13.3kw
Inverter: FoxESS KH10 (KH series, 10 kW single-phase hybrid inverter)
Battery: Make/Model: FoxESS EQ4800-L9, Total capacity: 41.93 kWh
I am with Amber (joined a week after the installation and joined their SmartShift VPP, still in learning mode).
I have Home Automation integration also with my system and I keep an eye on the data regularly to see if everything is ok.
I noticed a couple days after joining Amber that what FoxESS app tells me about the amount that I export to the Grid for that day does not match with what Amber is telling me. a little bit of difference is fine but the difference wht I have been seeing is huge.
I exported the inverter data for the past 10 days, got the usage data from Amber and compared the 2. Her's my findings.
Code: Select all
GRID EXPORT — FoxESS Inverter vs Ausgrid Smart Meter
Date FoxESS (kWh) Smart Meter (kWh) Diff (kWh) Ratio
2026-04-30 11.60 4.27 +7.33 2.72x
2026-05-01 8.50 3.11 +5.39 2.73x
2026-05-02 4.20 1.52 +2.68 2.76x
2026-05-03 8.40 3.10 +5.30 2.71x
2026-05-04 0.00 0.01 -0.01 —
2026-05-05 51.60 18.96 +32.64 2.72x
2026-05-06 2.50 0.91 +1.59 2.74x
2026-05-07 3.80 1.36 +2.44 2.79x
2026-05-08 4.40 1.61 +2.79 2.73x
2026-05-09 22.80 8.32 +14.48 2.74x
TOTAL 117.80 43.16 +74.64 2.73x
GRID IMPORT — FoxESS Inverter vs Ausgrid Smart Meter
Date FoxESS (kWh) Smart Meter (kWh) Diff (kWh)
2026-04-30 0.30 0.23 +0.07
2026-05-01 0.30 0.20 +0.10
2026-05-02 0.20 0.24 -0.04
2026-05-03 0.20 0.23 -0.03
2026-05-04 0.30 0.25 +0.05
2026-05-05 0.20 0.16 +0.04
2026-05-06 0.30 0.26 +0.04
2026-05-07 0.30 0.23 +0.07
2026-05-08 0.20 0.23 -0.03
2026-05-09 0.20 0.19 +0.01
TOTAL 2.50 2.21 +0.29
Something is wrong. I have asked my installer about this but also wanted to post here to see if others faced this issue what this possibly could be?