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Alder Street Retrofit
A one-day battery retrofit onto a five-year-old array we did not install.
Build notes
A battery on somebody else's array
A five-year-old array we did not install, on a house that wanted backup rather than more production. The existing inverter stayed; storage was added AC-coupled behind it.
The whole retrofit ran in a single day, including the load-shed panel that keeps the well pump and the fridge alive and leaves the electric range off the backup circuit.
What was installed
- 13.5 kWh of AC-coupled storage behind the existing inverter
- A load-shed subpanel for well pump, fridge and lighting
- Revenue-grade metering added at the point of interconnection
- Standard monitoring plan
The existing inverter stayed. Everything new sits behind it.
The system has carried four outages since commissioning, the longest of them nineteen hours.
Project facts
9 kW
Array size
1
Build days
$1,900
Annual saving
Measured result
Nineteen hours of backup, measured
Four measured outages carried on storage alone, with no generator and no manual switching.
n/a
Yield vs model
0
Days of lost operation
0
Days of lost operation
