Out of stock

Canadian Solar 400W Solar Panel CS1Y-400MS

price as of June 15
All Canadian Solar products All 400 Watt Panels


Rated Power Output 400 W
Voltage (VOC)52.3 V
Maximum String Voltage 1000V
Cell TypeMonocrystalline
Rated Efficiency19.9 %
Connector TypeT4 - MC4 compatible
Backsheet Colorblack
Frame Colorblack
Dimensions LxWxH79.6" x 39.2" x 1.38"
Weight49.8 lbs
Pallet Qty30
ManufacturerCanadian Solar
Manufacturer Part #CanadianSolar400WSolarPanelCS1Y-400MS
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
Warranty15/25 Year See Warranty details
Delivery Time 5-7 business days

About product

Canadian Solar 400W Solar Panel is an all-black high density mono PERC module, which offers great power output. The module shows an efficiency of up to 19.9%, which is achieved due to higher light absorption and reduced energy loss in cable. Canadian Solar CS1Y-400MS is an ideal solution for residential rooftop installations.

  • 400W Power Output
  • Monocrystalline
  • 19.9% Module Efficiency
  • Better shading tolerance
  • Heavy snow load up to 5400 Pa
  • Wind load up to 2400 Pa
  • MC4 or T4 series Connector

High Efficiency of up to 19.9%

Canadian Solar 400W CS1Y-400MS modules have a higher than average efficiency of 19.9%, which is achieved due to higher light absorption, innovative module design, and better shading tolerance.

Extreme Weather Resistance

Canadian Solar panels are designed to work well even under extreme weather conditions, being able to withstand heavy snow load of up to 5400 Pa and wind load of up to 2400 Pa. Operating temperature range is -40°F ~ 185°F.

High Reliability

Canadian Solar 400W CS1Y-400MS module features lower internal current and lower hot spot temperature, which adds to their outstanding reliability. Cell crack risk has been limited in small regions.

Easy Mounting

Reserved mounting holes allow for easier installation. Cables are optimised to be just the right length.

25-Year Warranty

Canadian Solar panels come with a 25-year linear power output warranty and 15-year product warranty on materials and workmanship.


79.6" x 39.2" x 1.38"


49.8 lbs

Reviews & Questions

  • Reviews (3)
  • Questions (6)
The delivery was fast and a calculator really did help in planning the system. Pleasure doing business with you guys.
S8nt M.
07/21/2021 07:03 pm
I purchased these panels half a year ago for my house in the countryside. A system even produces a little more than i expected. had to get a new fridge for the all the surplus
06/27/2021 10:48 am
I’m in New York, there really isn’t a lot of sun here, but panels work surprisingly well. Electricity is expensive around here, so i expect these panels to pay off quickly. Thanks!
06/04/2021 12:27 pm

Leave a review

is there a detailed drawing how to secure the panel say on a 2x8 wood frame , with modules 69.6" x 39.2" o.c. since I noticed that this panels can be butt joint? without spacing,
01/31/2022, 12:42
We don't have such a drawing, sorry. Generally, it's your installer who takes care of this. You can check out our articles on installation of solar panels.
It has the voltage listed at 52.3v how would this work with a 12v system
jimmy apodaca
11/24/2021, 00:50
You need charge controller.
I have a 500 watt inverter, its voltage is rated 10.5 to 28 vdc, will the single 400 watt solar panel work?
11/12/2021, 12:05
Is it polycrystalline or monocrystalline?
07/16/2021, 12:11
Canadian Solar 400W Panel is a monocrystalline PV module.
I don't want to clean panels from snow in the winter. how badly it’s going to affect their performance? can they break under the snow?
Scott Marrow
06/28/2021, 05:09
Canadian Solar panels withstand snow loads up to 5400 Pa, so no, they won’t break. A thin layer of snow is not going to be an issue for their performance, but the thicker it gets, the more energy you lose.
Hello, i want to install these panels on top of my house, but there are no power lines nearby. How do i set up a system?
Quentin J.
05/19/2021, 15:08
You can go for an off-grid type of system: panels aren’t connected to the grid and their energy is stored in the batteries. Find batteries in a corresponding section on our website.


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