The readings
5 jobs, and two of them do not flatter us.
Read from your own inverter display, before we start and after we finish, on the same day. Both figures go on your invoice. If we only printed the good ones the number would mean nothing.
12 May · 22 panels
4.81 kW5.06 kWOutput before cleaning 4.81 kW, after cleaning 5.06 kW.
Two months of dust and a lot of pollen.
3 June · 18 panels
3.94 kW3.97 kWOutput before cleaning 3.94 kW, after cleaning 3.97 kW.
Cleaned six weeks earlier. Barely worth doing and we said so.
21 June · 30 panels
6.12 kW6.71 kWOutput before cleaning 6.12 kW, after cleaning 6.71 kW.
First clean in two years, next to a construction site.
9 July · 14 panels
3.20 kW3.18 kWOutput before cleaning 3.20 kW, after cleaning 3.18 kW.
Lower afterwards. Cloud moved in between the two readings — this happens and we print it anyway.
28 July · 24 panels
5.40 kW5.72 kWOutput before cleaning 5.40 kW, after cleaning 5.72 kW.
Standard quarterly customer, dust only.
What the reading is not
It is a snapshot, an hour apart, on one afternoon. Cloud, angle, and temperature all move it, which is exactly why we will not turn a pair of readings into a percentage and put it on a website. It tells you something about your roof on that day and nothing about anybody’s roof in general.