Fox ESS has been recognised as a standout performer in the latest Energy Storage Inspection 2026, delivering record-breaking efficiency and reinforcing its position at the forefront of residential energy storage innovation.
In the independent study conducted by HTW Berlin, 12 photovoltaic storage systems across 5 kW and 10 kW categories were assessed using the System Performance Index (SPI). All systems achieved top-tier efficiency ratings – but Fox ESS set a new benchmark.
“Fox ESS’s 10 kW DC system achieved a new record with an SPI of 97%. According to the test results published on Thursday, this made it 3.5 times more efficient than the lowest-performing system in the comparison. The storage system, equipped with the 10 kW hybrid inverter “PQ-H3-Ultra-10.0,” impressed the testers with a very high average efficiency of 97.6% and low standby power consumption of just 4 watts”
As energy storage becomes increasingly critical to maximising solar self-consumption and grid flexibility, efficiency is more important than ever. The 2026 results underline Fox ESS’s commitment to delivering high-performance, reliable solutions that help homeowners and businesses get the most from their energy.
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