Details describe the tested sample, not every module of the series.
RETC PV Module Index — Silfab Solar
Year
Recognition
2023
High Achievement in Performance (Ptc-to-stc ratio, LeTID RESISTANCE, Module efficiency)
2024
High Achievement in Performance
2025
Performance High Achiever
2026
Performance discipline high achiever (Lid); Quality discipline high achiever (BOM verification); Reliability discipline high achiever (Pid, Sdml); Test Category High Achiever
Inverter compatibility & string sizing
Silfab Solar datasheet · Cali-Graf calculation · NLR PVWatts v8 · CEC PV Module List (Oct 7, 2026) · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)
44.4 V
Voc when cold
per panel
27.7 V
Vmp when hot
per panel
13
Max panels / string
max DC 600 V
3
Min panels / string
MPPT from 60 V
Defaults come from NLR TMY weather (coldest hour, hottest modeled cell). Code calculations (NEC 690.7) use the ASHRAE extreme annual minimum, which is usually colder — enter it above.
String inverters most named in SoCal permits
Inverter
Max DC input
MPPT
Window source
Panels per string
Tesla 1538000-xx-y
600 V
60–480 V
datasheet
3–13
Solis (Ginlong) S6-EH1P10K-H-US
600 V
80–520 V
datasheet
3–13
Solis (Ginlong) Solis-1P7.6K-4G-US
600 V
100–500 V
datasheet
4–13
Qcells Q.VOLT H7.6SX
498 V
234–498 V
CEC test window
9–11
Microinverters (one per panel)
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
44.4 / 27.7 V
⚠ Works; below MPPT at peak heat
1.28
Enphase IQ8X-80-M-US
320–540 W
79.5 V
43–60 V
44.4 / 27.7 V
✗ Not a match: module voltage below MPPT range
0.97
APsystems (Alt Power System) DS3-L
265–570 W
60 V
28–45 V
44.4 / 27.7 V
⚠ Works; below MPPT at peak heat
0.47
Enphase IQ8M-72-2-US
260–460 W
60 V
30–45 V
44.4 / 27.7 V
⚠ Works; below MPPT at peak heat
1.14
Enphase IQ8A-72-2-US
295–500 W
60 V
32–45 V
44.4 / 27.7 V
⚠ Works; below MPPT at peak heat
1.06
Voltage check against the microinverter datasheets — confirm the pairing on the manufacturer’s module compatibility list. Rows appear only when the panel’s power is inside the microinverter’s recommended module power range.
SolarEdge and other optimizer-based systems size strings by the optimizer rules — use the manufacturer’s designer. Reference inverters: most named in SoCal permits since Oct 2024.
Expected production in Southern California
NLR PVWatts v8 · Cali-Graf calculation
City
kWh / kW / yr
kWh / panel / yr
kWh / system / yr
Sun, kWh/m²/day
Los Angeles
1,676
620
11,782
6.08
Palmdale
1,835
679
12,900
6.69
Chula Vista
1,696
628
11,923
6.11
Huntington Beach
1,643
608
11,550
5.89
Riverside
1,696
628
11,923
6.21
Santa Clarita
1,724
638
12,120
6.28
Estimate for comparison, not a quote: shading, roof orientation and local losses change real output. Roof mount, 20° tilt, south, 14% system losses.
Who installs SIL-xxxHC panels in SoCal
building permits
9
Permits naming this series
Mar 2022 – Apr 2025
2
Jurisdictions so far
LA County (unincorp.) (8), Palmdale (1)
Permits over time
Power class named in permit
370 W
8
380 W
1
Typical system
median 10.4 kW, 24 panels (n = 5)
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.
Installed together with
building permits
Microinverters
Enphase IQ8+
3
Enphase IQ7+
2
Inverters
SolarEdge SE…H (HD-Wave)
2
Optimizers
SolarEdge Power Optimizer
2
Batteries
Enphase IQ Battery 5P
2
Number of permits naming both this panel series and the product; 9 of 9 permits list other equipment.
Other versions of this panel
CEC PV Module List (Oct 7, 2026) · building permits
Silfab Solar SIL-xxxHC+
Same product line · 380–420 W · listed 2023 · 28 SoCal permits
Compare with similar 370 W panels
CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · Canadian Solar datasheet · building permits
Panel
Pmax
Efficiency
γ Pmax (CEC)
Voc, V
Isc, A
PVEL (product / brand)
SoCal permits (series)
Silfab Solar SIL-370HC
370 W
≈20.2%
−0.379
41.75
11.25
product 2023
9
LONGi LR4-60HPB-370M
370 W
≈20.9%
−0.339
41.2
11.5
product 2021, 2022
193
Canadian Solar CS3N-375MS {Blk}
375 W
≈19%
−0.342
43.5
11.2
product 2023
46
REC Group REC370AA
370 W
≈21.9%
−0.258
44.1
10.55
brand 9× (2016–2025)
30
Same fields from the same sources for every row; ≈ efficiency is calculated from the listed area. Comparable series: other brands, same product group, power range covering this class.
Calculated from the panel area (1.83 m²): about 20.2% for the 370 W class. 370 W over 1.83 m² equals about 203 W per square meter.
How much energy does one panel produce in Los Angeles or Palmdale?
PVWatts v8 with typical-year weather gives about 620 kWh per year per 370 W panel in Los Angeles and about 679 kWh in Palmdale (20° roof, facing south, 14% system losses).
How much power does it lose on a hot roof?
With γ = −0.36 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.6% below the STC rating.
How many panels fit on one string?
With the Tesla 1538000-xx-y (max DC 600 V, MPPT from 60 V, datasheet) in Los Angeles the calculator gives 3–13 panels per string (Voc at 2 °C = 44.4 V, Vmp at 74 °C cell = 27.7 V). Final design must follow the inverter manual and NEC 690.7.
What does the warranty cover?
25 years on the product and 30 years on performance: at least 82.6% after 30 years (manufacturer datasheet).
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, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
Building permits — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Mar 2022 – Apr 2025); City of Palmdale (Feb 2024). 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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