Bruno is tested against real installations
up to 5 %
of difference between what Bruno estimated and what the meter measured, across 6 real installations.
| Installation | Location | System size | Performance | Estimate error |
|---|---|---|---|---|
| Home in Västerås | Sweden | 14 panels, 3.4 kWp | +1% | |
| Home in Timmendorfer Strand | Germany | 25 panels, 8 kWp | −1% | |
| Home in Ejea de los Caballeros | Spain | 5.9 kWp | +5% | |
| Home in Perth | Australia | 6.7 kWp | −5% | |
| Public library, New York State | USA | 96 panels, 19.7 kWp | +1% | |
| Commercial site in Safford, Arizona | USA | 52 panels, 21 kWp | −2% |
Home in Västerås+1%
Home in Timmendorfer Strand−1%
Home in Ejea de los Caballeros+5%
Home in Perth−5%
Public library, New York State+1%
Commercial site in Safford, Arizona−2%
How we measure it
We take real, publicly monitored installations on several continents, run Bruno on the same roof as if it were a new customer, and compare the yearly kWh Bruno estimated with what the meter actually recorded. We recalibrate whenever the gap opens.