Portable power stations come in all sorts of sizes, from small packs that you can carry with you to huge units you have to roll around on wheels. And the bigger the power station, the more power you need to keep it topped up.

This isn't a problem if you are recharging it from the mains, but if you are charging it using solar, the bigger power stations are going to need big solar panels. 

And usually, these solar panels aren't cheap. 

If you're looking for a good deal on big, 400W solar panels, you need to take a look at theEcoFlow 400W panels  which are almost half their regular price for Black Friday.

Also:The best Black Friday deals available right now

EcoFlow 400W Portable Folding Solar Panel, IP68 Water & Dustproof Deal for$699 (save$500)

View now at Amazon

I've tested dozens of solar panels for power stations over the past few years, and EcoFlow solar panels are some of the best available. 

First, these panels offer an industry-leading 23% conversion rate for solar energy, meaning that you get more bang for your buck and you get away with using a smaller solar panel. But don't be fooled, because at 16kg (35.3lbs) and an unfolded size of 93.1 by 41.7 by 0.98 inches, this is no petite panel!

Also: The best early Black Friday portable power station deals

This 400W solar panel is engineered to withstand the elements. It's built from layers of flexible EVA and tough fiberglass to ensure durability and portability and has an IP68 rating for water resistance and dust-proofing. 

It's a pain having solar panels that you have to take inside when the weather takes a turn for the worse. I know because I once spent two months in Scotland and had to put my panels away every time it rained -- and it rained a lot! -- so having the ability to leave them outside is a real-time saver.

The cherry on top of the cake with these panels is that the carry case doubles as a kickstand, allowing you to set up your panels such that you maximize the amount of sun hitting them by setting the angle just right. This means you can charge your solar power station even faster.

If you're looking to pick up one or more high-power solar panels to complement your power station, this Black Friday deal almost allows you to get two for the price of one.

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