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Silfab 400W Solar Panel 72 Cell SIL-400 NU

price as of August 18
Save $47.19
All Silfab products All 400 Watt Panels



Rated Power Output 400 W
Voltage (VOC)48.7 V
Maximum String Voltage 1500V
Cell number
  • 72 cell
Cell TypeMonocrystalline
Rated Efficiency19.6 %
Connector TypeMC4
Backsheet Color
  • white
Frame Color
  • silver
Dimensions LxWxH79.8 in x 39.6 in x 1.5 in
Weight48.5 lb
Manufacturer Part #SIL-400NU
Operating Temperatures −40°F to +185°F
Scope of Application
  • Solar Panels for Boats
  • Solar Panels for Commercial
  • Solar Panels for Home
  • Solar Panels for RV
  • Grid-Tie
  • Off-Grid
Warranty25-30 year warranty
Delivery Time 5-7 business days

About product

SIL-400 NU is a model that uses a number of technologies to bring durability and performance to the next level. This panel takes full advantage of the Passivated Emitter Rear Contact (PERC) technology that allows it to capture up to 12% more energy. All thanks to a reflective layer on the back. This design maximizes the number of photons absorbed by solar cells. The efficiency of this model reaches 19.6% — well above the market’s average. Silfab offers 25 years of product warranty and guarantees 82.6% of original performance after 30 years of operation.

  • 400 W power output
  • 72 full-sized PERC cells
  • 19.6% efficiency
  • 1500 V DC maximum system voltage
  • MC4 connectors
  • 25-year product and 30-year performance warranties

High efficiency of 19.6%

Silfab NU panels take full advantage of the company’s technologies that have won Silfab multiple awards. This PERC option offers higher power output per square foot of PV modules. This means quicker installation times and fewer clamps and racks. All of which reduces your overall costs, shortening the payback time.

Better performance at high temperatures

Excellent temperature coefficient means more energy as temperature rises. Every 1.8°F hike above 77°F will decrease your panel’s efficiency by only 0.38%.

Quality and reliability

SIL-400 NU receives multiple quality checks throughout the manufacturing process and is subject to stringent quality and reliability testing. The manufacturing facilities are highly automated, eliminating the risk of human error. Silfab is dedicated to quality, safety and reliability to ensure you get the very best.

Low degradation for a longer lifespan

These panels will lose no more than 2.9% of their power output in the first year of service. From the 2nd year to the 30th year, the average annual power decline will be no more than 0.50%. The module retains over 82.6% of its original output after 30 years. Guaranteed by Silfab.

Certified for the most challenging environmental conditions

SIL-400 NU is resistant to PID, salt, acid and ammonia. It can also withstand up to 5400 Pa mechanical load on the front and 2400 Pa on the back. Such robustness is mainly due to the 1.5" thick anodized aluminum frame and a layer of protective glass.


79.8" x 39.6" x 1.5"


48.5 lb

Reviews & Questions

  • Reviews (3)
  • Questions (3)
I support Silfab Solar because it is a local business that produces precisely crafted and highly effective solar panels of the finest quality. And I like A1 store because they treat their customers well and work fast
Adam Carson
05/21/2022 10:13 am
Because the Silfab panels come with a 25/30 year warranty, we decided to opt for them. The greatest value we found on the market
Muneeb Patel
03/18/2022 02:52 pm
Outstanding performance across various dimensions. Could not be happier that they are made in North America! I want more Silfab panels in this store
Carlyle Jenkins
03/04/2022 07:40 pm

Leave a review

Will these panels fit on top of a van?
A typical van like Ford Transit is more than 80" wide. This solar panel is only 79.8" long, so it should fit perfectly.
Do you have anyone I could speak to over the phone?
Yes, our live customer service is available from 10 a.m. to 6 p.m. EST. Our number: (800) 557-5686
can I order the panels and pick them up that same day?
Normally, we need about 48 hours to get your order ready.

Ask a question


How much is shipping and how long is delivery?
Our standard shipping charge is $250 for up to 11 panels and it is increased by $25 for every 4 additional panels. In the event, the product is only available on East or West coast custom quote will be sent to you before the order is processed. Normally, we are able to deliver solar panels within 7 business days.
What is the difference between low price panels and top price panels?
With top tier solar panels, you pay for the brand name, proprietary new technology, higher energy output, and better warranty support.
What are the dimensions of the panel?
Please refer to the product datasheet on the product page. We have a datasheet for every product we sell.
How long is the warranty on the panel?
In general, manufacturers provide a 25 year-long performance warranty and a 10 year-long equipment guarantee. Some manufacturers offer 12-15 years of warranty. More information is available in our warranty support section.
Which panels do you recommend for RV, marine?
We recommend Panasonic and Mission Solar panels for smaller systems as their high energy output and excellent craftsmanship guarantee years of service.
Can this panel be used with a 12v system?
Any of our panels can be used for a 12v system with a properly selected inverter and charge controller.
Can I pick up this panel from your fulfillment center to save on shipping?
Yes, we can set up a pick up at a local distributor. Please call to discuss options and stock availability.
How do I connect these panels?
To achieve the best system efficiency, panels should be connected in series to create higher voltage.
How many panels do I need?
This number is determined by your average energy needs. Depending on the type of panels and energy consumption, you might need anywhere from 12 to 45 solar panels. Remember, the more panels you install the more energy you will get.Please use our solar calculator to estimate your energy consumption and plan on building a solar system that will exceed your energy needs by 25%.
Do you offer discounts?
We do offer discounts for orders of over 50 units. Please contact us for details.
How do I build a solar system?
Please use our solar calculator to estimate what equipment you need. Choose your panels, microinverters, inverters, and solar batteries if necessary.Please note that we do not offer solar system design or installation.
How do solar panels compare?
Solar panels differ by power output, voltage, connection type, size, efficiency, and weight. Some solar panels might be sold together with microinverters as a set.
Can I build a solar system by myself as a Do It Yourself project?
Yes, it is possible if you understand what solar equipment you need and how to connect it together. However, please be mindful that handling your own electrical work without having proper experience might cause life-threatening injuries. Please contact a certified electrician if you do not possess appropriate electrical skills.
Can I connect and charge my solar panel battery directly with the solar panel?
We do not recommend using the solar panel without the charge controller. Using solar panels without the charge controller might damage the batteries.
Can I drill holes into the aluminum frame for mounting?
We do not recommend drilling any new holes to the aluminum frame of the panel as it could damage the internal circuit and solar cells. (Also, any modification to the panel will void the warranty). We recommend only using the pre-drilled holes for mounting.
Do solar panels require maintenance? Can I wash my solar panel?
Solar panels generally require very little maintenance. We recommend cleaning the solar panel with water, glass cleaner (Windex) and microfiber cloth.
Will my panel produce power in an overcast condition?
While solar panels require sunlight to generate solar energy, they will still work in cloudy weather. Even on a cloudy day, solar panels will produce energy just not as much.
Will my panels produce power if covered with snow?
Solar panels cannot produce electricity if covered with snow.
What is the best direction for a solar panel to face?
The best direction for a solar panel to face is the South