645 W PERC solar panel with 132 cells. Voc 44.8 V · Isc 18.35 A · TcVoc -0.25%/°C.
Select the panel you want to replace
Panel not in the catalogue?
31 of the 4,444 panels in the catalogue can replace RECOM RCM-645-8BMM. Before you buy, check your pick in the string calculator with your inverter.
CloseNoticeableLarge differenceTap or click a difference to see what it means for your string.
Near-identical electrics — a drop-in swap for the same string.
Match 95 % · 1 model
Small differences within tolerance — safe once verified in the calculator with your inverter.
Match 80–91 % · 10 models
Noticeable differences — the string voltage and current need a careful check.
Match 61–79 % · 17 models
Large differences — a real risk of a mismatched string; prefer a closer panel.
Match 52–58 % · 3 models
String Compatibility Calculator
Verify the replacement panel works with your inverter
Panel Matcher
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Find an inverter that fits your panel array with the right MPPT range and DC/AC ratio.
How the Algorithm Works
Learn how panels are scored and matched
Voc
44.8 V
Vmpp
37.7 V
Isc
18.35 A
Impp
17.11 A
TcVoc
-0.25 %/°C
TcPmax
-0.34 %/°C
Pmax
645 W
Cells
132
Bifaciality
70%
Length
2384 mm
Width
1303 mm
Thickness
35 mm
Weight
34.4 kg
The RECOM RCM-645-8BMM is a 645 W solar panel. Finding a compatible replacement requires matching the original electrical characteristics — particularly Voc, Vmpp, Isc, and temperature coefficients — to ensure safe operation within the same string.
Use the form above to find panels that match these specifications. Then verify the replacement in the String Compatibility Calculator with your inverter.
| Model | Power | Voc | Isc |
|---|---|---|---|
| RCM-650-8BMM | 650 W | 45 V | 18.38 A |
| RCM-655-8BMM | 655 W | 45.21 V | 18.44 A |
| RCM-660-8BMM | 660 W | 45.39 V | 18.47 A |
| RCM-665-8BMM | 665 W | 45.59 V | 18.51 A |
The most critical specs to match are: cell count (must be exactly 132), Voc close to 44.8 V (within ±5%), and temperature coefficient TcVoc close to -0.25%/°C. If Voc differs significantly, the string voltage at extreme temperatures may shift outside the inverter's MPPT range. The replacement finder above pre-screens all candidates by these criteria.
A higher wattage panel usually has a higher Vmpp or Isc, which can affect string voltage and current. Small increases (up to 10–15%) are typically safe if the other electrical specs align. The replacement finder shows a compatibility score — 'Exact match' means the specs align closely. Always verify the replacement in the String Compatibility Calculator with your inverter before installation.
If the replacement has a significantly different Voc or Vmpp, the string voltage may shift outside the inverter's MPPT range, reducing energy production or causing faults. This effect is amplified at temperature extremes: at low temperatures, voltage rises by the TcVoc coefficient. The replacement finder automatically accounts for this — it scores candidates by how closely the electrical specs match the original RECOM RCM-645-8BMM.