Details describe the tested sample, not every module of the series.
RETC PV Module Index — REC Group
Year
Recognition
2023
High Achievement in Performance (Ptc-to-stc ratio, Module efficiency)
2024
High Achievement in Performance
2025
Test Category High Achiever
Inverter compatibility & string sizing
CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · NLR PVWatts v8 · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)
46.8 V
Voc when cold
per panel
31.4 V
Vmp when hot
per panel
12
Max panels / string
max DC 600 V
2
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. β is the CEC-measured coefficient; NEC 690.7 calculations use the datasheet value.
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
2–12
Solis (Ginlong) S6-EH1P10K-H-US
600 V
80–520 V
datasheet
3–12
Solis (Ginlong) Solis-1P7.6K-4G-US
600 V
100–500 V
datasheet
4–12
Qcells Q.VOLT H7.6SX
498 V
234–498 V
CEC test window
8–10
Microinverters (one per panel)
No microinverter in the reference set lists this power class in its recommended module power range.
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
1,022
11,246
6.08
Palmdale
1,835
1,119
12,313
6.69
Chula Vista
1,696
1,035
11,380
6.11
Huntington Beach
1,643
1,002
11,025
5.89
Riverside
1,696
1,035
11,380
6.21
Santa Clarita
1,724
1,052
11,568
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.
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.
About REC Group
CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · RETC PV Module Index · building permits
ManufacturerREC Group
Listed in CEC asREC Group
PVEL Top Performer (manufacturer)9 Scorecards (2016–2025)
RETC PV Module Index2023, 2024, 2025
Current panel series in CEC list26
Other series by SoCal permits
RECxxxAA Pure · 66RECxxxAA Pure-RX · 33RECxxxAA · 30RECxxxAA Black · 8RECxxxNP3 Black · 7RECxxxAA Pure 2 · 6
Questions & answers
How efficient is the REC Group REC610AA Pro MG?
Calculated from the panel area (2.77 m²): about 22% for the 610 W class. 610 W over 2.77 m² equals about 220 W per square meter.
How much energy does one panel produce in Los Angeles or Palmdale?
PVWatts v8 with typical-year weather gives about 1,022 kWh per year per 610 W panel in Los Angeles and about 1,119 kWh in Palmdale (20° roof, facing south, 14% system losses).
How much power does it lose on a hot roof?
With γ = −0.233 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 12.1% 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 2–12 panels per string (Voc at 2 °C = 46.8 V, Vmp at 74 °C cell = 31.4 V). Final design must follow the inverter manual and NEC 690.7.
Is it bifacial?
Yes. Rear gain depends on mounting height and ground reflectance.
Has this panel been reliability-tested?
RECxxxAA Pro MG was a PVEL Top Performer in 2025 (PID).
Sources
California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
Clean Energy Council (Australia) — Approved PV modules list (as of Oct 8, 2026).
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
Inverter datasheets — Solis (Ginlong), Tesla (manufacturer documents).
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).
Get your free estimate
Three fields, and Cali Energy calls back within 30 minutes during business hours.
Thanks!
We got your request and will call back within 30 minutes during business hours.
