Out of stock

Canadian Solar 400W Solar Panel CS1Y-400MS

price as of October 01
Solar Loan from 6.99%
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 Color
  • black
Frame Color
  • black
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.