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Palouse Grain Co-operative
The 180 kW roof we built in 2004, re-metered in 2024 and still producing 92% of its original yield.
Build notes
Built in 2004, re-metered in 2024
We built this roof in 2004, re-metered it in 2024, and it is still producing 92% of its original yield. It is the reason we now warranty production for twenty-five years rather than fifteen.
Two string inverters were replaced in year eleven. Every module is original.
What was installed
- 1,040 modules at 175 W, original to 2004
- Two string inverters replaced in 2015
- Continuous monthly metering since commissioning
- Production record used to set our 25-year warranty
Every module is original. Two inverters were not.
The full twenty-two year production record is available to any owner who asks for it.
Project facts
180 kW
Array size
52
Build days
$34k
Annual saving
Measured result
92% of original yield after twenty-two years
Twenty-two years of continuous monthly meter reads, audited against the original 2004 design model.
92%
Yield vs model
0
Days of lost operation
0
Days of lost operation
