400W N-Type Bifacial Solar Panel
Sold by Renogy UK
From £379.99across the range: £379.99 – £759.99
Renogy UK's price when we last checked, on 2 September 2026. They run promotions and price by variant, so confirm the current price on their page before you buy.
Buy at Renogy UK (opens Renogy UK in a new tab)Multiple variants; verify the linked variant before quoting a price
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Delivery and returns
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Warranty and support
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Overview
400W N-Type Bifacial Solar Panel
400W per panel at 21.5% efficiency — the highest in the range. A 1722 × 1134mm module weighing 20.6kg, sold in pairs. Serious generation for a motorhome roof, a static build or a ground array.
- 400W at STC, 21.5% module efficiency
- N-type bifacial
- Vmp 34.0V, Voc 39.42V, Imp 11.76A, Isc 13.06A
- 1500V DC maximum system voltage
- 20.6kg, 1722 × 1134 × 35mm
- 25-year power output warranty
Not a panel van panel
1722 × 1134mm is nearly two square metres, and at 20.6kg a pair is over 41kg on the roof. Very few panel vans have the width to take it squarely between the rails. Where it does fit — a coachbuilt motorhome, a horsebox, a shed or a ground frame — 21.5% efficiency means you get more watts from the same area than anything else here.
Current is the design constraint
At 11.76A operating current, two in parallel is over 23A and the cable needs to be sized for it. Two in series is a much better arrangement at this power level: 68V, half the current, thinner cable — provided the controller's input ceiling allows it. Maximum series fuse rating is 25A.
Before you order
Handling a 20.6kg panel of this size on a roof needs two people and a still day. Check the roof structure will carry the point loads at the bracket positions, not just the total weight.
Renogy's published figures
Taken from Renogy's own specification for this product, on the date shown by the price. Anything wired into 230V mains should be signed off by a qualified electrician.
Build notes for this part
Get the sizing and fitting notes.
Useful product advice, installation considerations and occasional offers for this part of your van build.