UL 1741 SB is required for new interconnections in California (Rule 21) since 2026.
Panel compatibility & string sizing
NLR SAM inverter library · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation
D700-M2: max DC 48 V · MPPT 33–48 V (CEC test window)
Most-permitted panels in Southern California
Panel
Power
Voc cold / Vmp hot
Check
DC/AC
Installed together
JA Solar JAM54S31-405/MR
405 W
39.4 / 25.5 V
⚠ Below MPPT at peak heat
0.58
2
Qcells Q.PEAK DUO BLK ML-G10.C+ 410
410 W
48.1 / 30.6 V
✗ Cold Voc above max input
0.59
—
Qcells Q.PEAK DUO BLK ML-G10+ 410
410 W
48.1 / 30.6 V
✗ Cold Voc above max input
0.59
—
LONGi LR5-54HABB-400M
400 W
39.3 / 25.3 V
⚠ Below MPPT at peak heat
0.57
—
Hyundai Solutions HiN-T440NF(BK)
440 W
40.9 / 27 V
⚠ Below MPPT at peak heat
0.63
—
Silfab Solar SIL-440QD
440 W
41.1 / 28 V
⚠ Below MPPT at peak heat
0.63
—
Qcells Q.TRON BLK M-G2+ 430
430 W
41.3 / 28 V
⚠ Below MPPT at peak heat
0.62
—
Qcells Q.TRON BLK M-G2.H+ 430
430 W
41.3 / 28 V
⚠ Below MPPT at peak heat
0.62
—
REC Group REC460AA Pure-RX
460 W
68.8 / 47.1 V
✗ Cold Voc above max input
0.66
—
Elin (Sirius PV) ELNSM54M-HC-410
410 W
39.3 / 25.3 V
⚠ Below MPPT at peak heat
0.59
—
Qcells Q.TRON BLK M-G2.C+ 430
430 W
41.3 / 28 V
⚠ Below MPPT at peak heat
0.62
—
Tesla TSP-420
420 W
43.4 / 27.7 V
⚠ Below MPPT at peak heat
0.6
—
Voltage check only, from CEC panel data and NLR weather for the city. Final design must follow the inverter manual and NEC 690.7.
Installed in Southern California
building permits
2
Permits name it
Jun 2025
1
Jurisdictions so far
LA County (unincorp.) (2)
6
Units listed
median 3 per permit
Model named in permit
D700-M2
2
Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Permits from LA County (unincorp.) come without a contractor license, so they count toward totals but not toward installers. Counts grow as more permit portals are loaded.
Compare with similar 696 W inverters
CEC Grid Support Inverter List (Oct 7, 2026) · building permits
Inverter
Power
CEC weighted eff.
DC test window
UL 1741 SB
Latest CEC
SoCal permits
Power Center Dxxx-M2
696 W–696 W
96.5%
33–48 V
Yes
2022
2
Enphase Energy IQ8 Series
240 W–633 W
97.5%
25–95 V
44 of 45
2025
1,104
Hoymiles HM-xxxNT
295 W–1.44 kW
96.5%
29–48 V
11 of 12
2023
3
FOXESS M1-xxxx-NA
600 W–1.2 kW
95.5%
35–50 V
Yes
2026
—
Power Center Dxxx-M2A-240A
600 W–768 W
96.5%
22–55 V
Yes
2025
—
Same type and grid voltage, power range covering this model; same fields from the same sources.
The California Energy Commission lists a weighted efficiency of 96.5% for Power Center Dxxx-M2 models, measured at six power levels and three DC voltages.
Is the Power Center Dxxx-M2 certified to UL 1741 SB?
Yes — the CEC Grid Support Inverter List shows UL 1741 SB for all models.
What is the D700-M2’s DC input voltage range?
CEC tested it at 33–48 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.
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 — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Jun 2025). Equipment matched from permit descriptions by model number.
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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