The California Energy Commission lists a weighted efficiency of 96.5% for Sol-Ark xxK-3P-208V models, measured at six power levels and three DC voltages.
Is the Sol-Ark xxK-3P-208V certified to UL 1741 SB?
Yes — the CEC Grid Support Inverter List shows UL 1741 SB for all models.
Can the Sol-Ark xxK-3P-208V be used with a battery?
The CEC lists it as a dc-coupled hybrid (pv + battery).
What is the 30K-3P-208V’s DC input voltage range?
CEC tested it at 270–500 V DC.
Sources
California Energy Commission — Grid Support Inverter List (solar and battery inverters), data as of Oct 7, 2026. Manufacturer-reported, confirmed by CEC against certificates and test reports.
Sol-Ark — document library on the manufacturer’s website (links above).
NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
California Energy Commission — PV Module List (module electrical data for the compatibility check).
Building permits — Southern California permit portals. Equipment matched from permit descriptions.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).
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