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Larkspur Residence
A 12 kW array across three roof planes, paired with 26 kWh of storage for a two-EV household.
Build notes
A twelve kilowatt array across three pitches
Three roof planes at three different pitches, on a house with two EVs and a heat pump. The array was split across two inverters so the north-west plane never drags the rest of the system down.
Storage was sized on the household's own winter usage rather than a rule of thumb: 26 kWh covers an evening peak and one outage day without generator support.
What was installed
- 22 bifacial modules at 545 W across three roof planes
- Two string inverters with independent MPPT per plane
- 26 kWh of storage with whole-home backup
- Production monitoring on the Standard plan
Storage was sized on the household's own winter usage, not a rule of thumb.
Twelve months of metered production came in 2% above model. The monitoring report goes to the owner monthly.
Project facts
12 kW
Array size
18
Build days
$2,400
Annual saving
Measured result
Two percent above model in its first year
Metered against the design model over a full year, including two winter outages carried entirely by storage.
+2%
Yield vs model
0
Days of lost operation
0
Days of lost operation
