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Get a Free QuoteWhich is better for your home? We install both. Here's our honest, spec-by-spec comparison based on real installation experience.
Both the Q CELLS Q.PEAK DUO BLK ML-G10+ 415W and Silfab SIL-420 BG Elite 420W are excellent choices. The Q CELLS Q.PEAK DUO BLK ML-G10+ 415W is better if you prioritize best overall value for residential installs, while the Silfab SIL-420 BG Elite 420W shines for homeowners who want american-made panels. For most homeowners, either product will serve you well — your choice should come down to which features matter most to your household.
Q CELLS · Q.PEAK DUO BLK ML-G10+ 415
Silfab · SIL-420 BG Elite
| Spec | Q CELLS | Silfab |
|---|---|---|
| Wattage | 415W | 420W |
| Efficiency | 21.1% | 21.9% |
| Temp Coefficient | -0.34%/°C | -0.34%/°C |
| Degradation Rate | 0.54%/yr (86% at year 25) | 0.50%/yr (87.5% at year 25) |
| Cell Type | Monocrystalline PERC, half-cut (Q.ANTUM DUO Z) | Monocrystalline, X-pattern backsheet |
| Dimensions | 41.1 x 74.0 x 1.3 in (1045 x 1879 mm) | 40.5 x 73.4 x 1.4 in (1029 x 1864 mm) |
| Weight | 46.3 lbs (21 kg) | 45.8 lbs (20.8 kg) |
| Origin | South Korea / USA (Dalton, GA) | USA (Burlington, WA) |
| Frame | Black anodized aluminum | Black anodized aluminum |
We evaluate each product across the metrics that matter most to homeowners.
Both offer 25-year warranties.
Q CELLS Q.PEAK DUO BLK ML-G10+ 415W is more affordable at $1.00-1.20/W (panel only) vs $1.10-1.30/W (panel only).
Our crew rates the Q CELLS Q.PEAK DUO BLK ML-G10+ 415W higher at 9/10 vs 8.5/10.
Silfab SIL-420 BG Elite 420W is more efficient at 21.9% vs 21.1%.
Silfab SIL-420 BG Elite 420W degrades more slowly at 0.50%/yr (87.5% at year 25) vs 0.54%/yr (86% at year 25).
This is our bread-and-butter panel. The standard size makes racking straightforward and we rarely need custom configurations. Q CELLS has the best domestic supply chain — we almost never face backorder delays. Crew installs average 15-20 panels per day with this model. Rated for 5400 Pa snow load and 4000 Pa wind load — ideal for New England.
Silfab is our American-made pick. The panels are slightly lighter than Q CELLS, which crews appreciate on steep roofs. The X-pattern backsheet technology gives solid efficiency without N-type cell costs. We recommend Silfab especially for commercial projects where the domestic content ITC adder adds real savings. Reliable supply chain — no tariff or FEOC concerns.
Both the Q CELLS Q.PEAK DUO BLK ML-G10+ 415W and Silfab SIL-420 BG Elite 420W are excellent choices. The Q CELLS Q.PEAK DUO BLK ML-G10+ 415W is better if you prioritize best overall value for residential installs, while the Silfab SIL-420 BG Elite 420W shines for homeowners who want american-made panels. For most homeowners, either product will serve you well — your choice should come down to which features matter most to your household.
Our energy advisors can help you decide between the Q CELLS Q.PEAK DUO BLK ML-G10+ 415W and Silfab SIL-420 BG Elite 420W based on your specific home, budget, and energy goals.
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