California
LADWP solar bill explained112 cells. Power classes 395–420 W in the CEC list; datasheet covers 405–420 W.
| Model | Pmax | Voc, V | Isc, A | Vmp, V | Imp, A | Efficiency | PTC | CEC listed |
|---|---|---|---|---|---|---|---|---|
| SPR-MAX3-395-BLK-R | 395 W | 40.61 | 12.58 | 34.46 | 11.46 | ≈20.8% | 373 W | Mar 1, 2023 |
| SPR-MAX3-400-BLK-R | 400 W | 40.63 | 12.60 | 34.67 | 11.54 | ≈21.1% | 378 W | Mar 1, 2023 |
| SPR-MAX3-405-BLK-R | 405 W | 40.65 | 12.62 | 34.89 | 11.61 | ≥21.4% | 382 W | Mar 1, 2023 |
| SPR-MAX3-410-BLK-R | 410 W | 40.68 | 12.63 | 35.10 | 11.68 | ≥21.6% | 387 W | Mar 1, 2023 |
| SPR-MAX3-415-BLK-R | 415 W | 40.70 | 12.64 | 35.31 | 11.75 | ≥21.9% | 392 W | Mar 1, 2023 |
| SPR-MAX3-420-BLK-R | 420 W | 40.73 | 12.65 | 35.52 | 11.82 | ≥22.2% | 397 W | Mar 1, 2023 |
| CEC listing test | |
|---|---|
| Pmax coefficient γ | −0.280 %/°C |
| Voc coefficient β | −0.234 %/°C |
| Isc coefficient α | +0.045 %/°C |
| Operating cell temperature | NOCT 46 °C |
| Class | Pmax at NOCT | Vmp × Imp at NOCT | Pmax at 200 W/m² | Low-light efficiency vs STC |
|---|---|---|---|---|
| 395 W | 292.8 W | 31.74 V × 9.23 A | 73.8 W | 93% |
| 400 W | 296.6 W | 31.93 V × 9.29 A | 74.7 W | 93% |
| 405 W | 300.3 W | 32.13 V × 9.35 A | 75.7 W | 93% |
| 410 W | 304 W | 32.32 V × 9.4 A | 76.6 W | 93% |
| 415 W | 307.6 W | 32.52 V × 9.46 A | 77.5 W | 93% |
| 420 W | 311.3 W | 32.71 V × 9.52 A | 78.4 W | 93% |
| Inverter | Max DC input | MPPT | Window source | Panels per string |
|---|---|---|---|---|
| Tesla 1538000-xx-y | 600 V | 60–480 V | datasheet | 3–14 |
| Solis (Ginlong) S6-EH1P10K-H-US | 600 V | 80–520 V | datasheet | 3–14 |
| Solis (Ginlong) Solis-1P7.6K-4G-US | 600 V | 100–500 V | datasheet | 4–14 |
| Qcells Q.VOLT H7.6SX | 498 V | 234–498 V | CEC test window | 8–11 |
| Microinverter | Recommended module power | Max DC input | MPPT | Voc cold / Vmp hot | Check | DC/AC |
|---|---|---|---|---|---|---|
| Enphase IQ8PLUS-72-2-US | 235–440 W | 60 V | 29–45 V | 42.8 / 29.3 V | ✓ Within range | 1.4 |
| Enphase IQ8X-80-M-US | 320–540 W | 79.5 V | 43–60 V | 42.8 / 29.3 V | ✗ Not a match: module voltage below MPPT range | 1.07 |
| APsystems (Alt Power System) DS3-L | 265–570 W | 60 V | 28–45 V | 42.8 / 29.3 V | ✓ Within range | 0.52 |
| Enphase IQ8M-72-2-US | 260–460 W | 60 V | 30–45 V | 42.8 / 29.3 V | ⚠ Works; below MPPT at peak heat | 1.25 |
| Enphase IQ8A-72-2-US | 295–500 W | 60 V | 32–45 V | 42.8 / 29.3 V | ⚠ Works; below MPPT at peak heat | 1.16 |
| City | kWh / kW / yr | kWh / panel / yr | kWh / system / yr | Sun, kWh/m²/day |
|---|---|---|---|---|
| Los Angeles | 1,676 | 679 | 11,539 | 6.08 |
| Palmdale | 1,835 | 743 | 12,634 | 6.69 |
| Chula Vista | 1,696 | 687 | 11,677 | 6.11 |
| Huntington Beach | 1,643 | 665 | 11,312 | 5.89 |
| Riverside | 1,696 | 687 | 11,677 | 6.21 |
| Santa Clarita | 1,724 | 698 | 11,870 | 6.28 |
| Panel | Pmax | Efficiency | γ Pmax (CEC) | Voc, V | Isc, A | PVEL (product / brand) | SoCal permits (series) |
|---|---|---|---|---|---|---|---|
| Maxeon Solar Technologies SPR-MAX3-405-BLK-R | 405 W | ≥21.4% | −0.280 | 40.65 | 12.62 | brand 8× | — |
| Qcells Q.PEAK DUO BLK ML-G10+ 405 | 405 W | ≥20.6% | −0.362 | 45.34 | 11.17 | product 2022, 2023 | 221 |
| JA Solar JAM54S31-405/MR | 405 W | ≈21.3% | −0.329 | 37.23 | 13.87 | product 2023, 2024 | 152 |
| REC Group REC405AA Pure | 405 W | ≈22.6% | −0.256 | 48.9 | 10.3 | brand 9× (2016–2025) | 66 |
The Maxeon Solar Technologies datasheet guarantees at least 21.4% module efficiency for the 405 W class (up to 22.2% for 420 W). 405 W over 1.9 m² equals about 213 W per square meter.
PVWatts v8 with typical-year weather gives about 679 kWh per year per 405 W panel in Los Angeles and about 743 kWh in Palmdale (20° roof, facing south, 14% system losses).
With γ = −0.280 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 14.5% below the STC rating.
With the Tesla 1538000-xx-y (max DC 600 V, MPPT from 60 V, datasheet) in Los Angeles the calculator gives 3–14 panels per string (Voc at 2 °C = 42.8 V, Vmp at 74 °C cell = 29.3 V). Final design must follow the inverter manual and NEC 690.7.
Voltage check against the Enphase datasheet: Voc when cold 42.8 V vs max input 60 V; Vmp when hot 29.3 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.
25 years on the product and 25 years on performance (manufacturer datasheet).
This exact series is not in published PVEL Top Performer tables; Maxeon Solar Technologies was named a Top Performer in 8 Scorecards (2017–2025).
UL 61730 fire rating Class C per datasheet.