Solar Panels

REC Alpha Pure-RX 470W vs Silfab SIL-420 BG Elite 420W

Side-by-side comparison based on specs, real pricing, and our crew's installation experience. Updated for 2026.

Marcus R.Senior Solar Engineer

NABCEP PV Installation Professional·Updated Apr 2026

REC

Silfab

9.5

Choose REC Alpha Pure-RX 470W if:

Maximum energy per square foot
Space-constrained roofs needing highest output
Homeowners who want the premium option with best warranty
Hot climates (best temperature coefficient)

$1.30-1.50/W (panel only)

8.5

Choose Silfab SIL-420 BG Elite 420W if:

Homeowners who want American-made panels
Qualifying for domestic content ITC adders on commercial projects
Strong snow/wind load tolerance (New England weather)
Installers who value reliable US supply chain

$1.10-1.30/W (panel only)

Spec-by-Spec Comparison

Specification

REC Alpha Pure-RX 470

Silfab SIL-420 BG Elite

Price

$1.30-1.50/W (panel only)

$1.10-1.30/W (panel only)

Warranty

25 years

Wattage

470W

420W

Efficiency

22.6%

21.9%

Temp Coefficient

-0.26%/°C

-0.34%/°C

Degradation Rate

0.25%/yr (92% at year 25)

0.50%/yr (87.5% at year 25)

Cell Type

Heterojunction (HJT), gapless

Monocrystalline, X-pattern backsheet

Dimensions

42.5 x 74.3 x 1.2 in (1080 x 1890 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

Norway / Singapore

USA (Burlington, WA)

Frame

Black anodized aluminum

NuWatt Rating

9.5/10

8.5/10

Pros & Cons

REC Alpha Pure-RX 470W

Pros

+22.6% efficiency — among the highest available for residential
+-0.26%/°C temperature coefficient — best heat performance in lineup
+0.25%/yr degradation — 92% output at year 25
+REC ProTrust warranty covers product, power, and labor
+HJT cell technology for superior long-term performance
+470W output — 15% more power per panel than Q CELLS

Cons

-Premium pricing — 20-30% more than Q CELLS per watt
-Lower availability — longer lead times possible
-European manufacturing means higher shipping costs

Silfab SIL-420 BG Elite 420W

Pros

+Made in USA (Burlington, WA & Toronto) — qualifies for domestic content bonus
+21.9% efficiency with proprietary X-pattern conductive backsheet
+25-year product warranty — matches Q CELLS and REC
+Rated for 5400 Pa snow load — built for Northeast winters
+No FEOC risk — fully domestic supply chain

Cons

-Lower efficiency than REC or Maxeon premium options
-420W output — less than N-type TOPCon competitors
-Smaller brand — less installer ecosystem than Q CELLS or REC

Installation Notes from Our Crew

REC Alpha Pure-RX 470W

REC Alpha Pure-RX is our go-to premium panel. The 470W output means fewer panels for the same system size, which reduces racking hardware and labor. HJT cells have near-zero LID (light-induced degradation), so these panels produce at full rated power from day one. We recommend REC for space-constrained roofs where every watt per square foot counts.

Silfab SIL-420 BG Elite 420W

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.

Frequently Asked Questions

Is the REC Alpha Pure-RX 470W or Silfab SIL-420 BG Elite 420W better?

The REC Alpha Pure-RX 470W scores 9.5/10 vs 8.5/10 in our rating. It excels at: maximum energy per square foot. The Silfab SIL-420 BG Elite 420W is the better choice if: homeowners who want american-made panels. The right pick depends on your specific situation.

How much does the REC Alpha Pure-RX 470W cost vs the Silfab SIL-420 BG Elite 420W?

The REC Alpha Pure-RX 470W costs $1.30-1.50/W (panel only). The Silfab SIL-420 BG Elite 420W costs $1.10-1.30/W (panel only). Both prices include professional installation by NuWatt Energy. State incentives may reduce your net cost — use our calculator for exact pricing.

Which has a better warranty?

The REC Alpha Pure-RX 470W has a 25-year warranty (25-year product, power, and labor warranty (REC ProTrust)). The Silfab SIL-420 BG Elite 420W has a 25-year warranty (25-year product & 30-year performance warranty). Both offer the same warranty length.

Does NuWatt install both the REC Alpha Pure-RX 470W and Silfab SIL-420 BG Elite 420W?

Yes. NuWatt Energy installs both products and our crew has hands-on experience with each. We can help you choose based on your home, energy goals, and budget during a free consultation.

Can I switch from REC to Silfab later?

In most cases, yes. Solar panels can be replaced individually if needed, though it's best to install matching panels. Mixing panel types on the same string inverter can reduce performance. Contact NuWatt for a specific assessment of your system.

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Spec-by-Spec Comparison

Specification

REC Alpha Pure-RX 470

Silfab SIL-420 BG Elite

Price

$1.30-1.50/W (panel only)

$1.10-1.30/W (panel only)

Warranty

25 years

Wattage

470W

420W

Efficiency

22.6%

21.9%

Temp Coefficient

-0.26%/°C

-0.34%/°C

Degradation Rate

0.25%/yr (92% at year 25)

0.50%/yr (87.5% at year 25)

Cell Type

Heterojunction (HJT), gapless

Monocrystalline, X-pattern backsheet

Dimensions

42.5 x 74.3 x 1.2 in (1080 x 1890 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

Norway / Singapore

USA (Burlington, WA)

Frame

Black anodized aluminum

NuWatt Rating

9.5/10

8.5/10

Pros & Cons

REC Alpha Pure-RX 470W

Pros

+22.6% efficiency — among the highest available for residential
+-0.26%/°C temperature coefficient — best heat performance in lineup
+0.25%/yr degradation — 92% output at year 25
+REC ProTrust warranty covers product, power, and labor
+HJT cell technology for superior long-term performance
+470W output — 15% more power per panel than Q CELLS

Cons

-Premium pricing — 20-30% more than Q CELLS per watt
-Lower availability — longer lead times possible
-European manufacturing means higher shipping costs

Silfab SIL-420 BG Elite 420W

Pros

+Made in USA (Burlington, WA & Toronto) — qualifies for domestic content bonus
+21.9% efficiency with proprietary X-pattern conductive backsheet
+25-year product warranty — matches Q CELLS and REC
+Rated for 5400 Pa snow load — built for Northeast winters
+No FEOC risk — fully domestic supply chain

Cons

-Lower efficiency than REC or Maxeon premium options
-420W output — less than N-type TOPCon competitors
-Smaller brand — less installer ecosystem than Q CELLS or REC

Installation Notes from Our Crew

REC Alpha Pure-RX 470W

Silfab SIL-420 BG Elite 420W

Frequently Asked Questions

Is the REC Alpha Pure-RX 470W or Silfab SIL-420 BG Elite 420W better?

How much does the REC Alpha Pure-RX 470W cost vs the Silfab SIL-420 BG Elite 420W?

Which has a better warranty?

Does NuWatt install both the REC Alpha Pure-RX 470W and Silfab SIL-420 BG Elite 420W?

Yes. NuWatt Energy installs both products and our crew has hands-on experience with each. We can help you choose based on your home, energy goals, and budget during a free consultation.

Can I switch from REC to Silfab later?

Update Location

REC Alpha Pure-RX 470W vs Silfab SIL-420 BG Elite 420W

Choose REC Alpha Pure-RX 470W if:

Choose Silfab SIL-420 BG Elite 420W if:

Spec-by-Spec Comparison

Pros & Cons

REC Alpha Pure-RX 470W

Pros

Cons

Silfab SIL-420 BG Elite 420W

Pros

Cons

Installation Notes from Our Crew

REC Alpha Pure-RX 470W

Silfab SIL-420 BG Elite 420W

Frequently Asked Questions

Related Comparisons

Not Sure Which to Choose?

Ready to start your clean energy project?

REC Alpha Pure-RX 470W vs Silfab SIL-420 BG Elite 420W

Choose REC Alpha Pure-RX 470W if:

Choose Silfab SIL-420 BG Elite 420W if:

Spec-by-Spec Comparison

Pros & Cons

REC Alpha Pure-RX 470W

Pros

Cons

Silfab SIL-420 BG Elite 420W

Pros

Cons

Installation Notes from Our Crew

REC Alpha Pure-RX 470W

Silfab SIL-420 BG Elite 420W

Frequently Asked Questions

Related Comparisons

Not Sure Which to Choose?