440W Bifacial Panels + Hybrid Inverter: Game Changing Energy Solution? 

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JA is low end Chinese rubbish. No comparison to REA / REC etc.

@@singlendhot8628 REC not comparable to REA

You can find a number of vendors who make statements about their products such as "Module efficiency up to" or for one vendor their warranty states "During the first year, {The company} warrants the actual power output of the Products will be no less than 97.5% of the labeled power output." which is stated on a 575W panel for 2.5% possible drop is a fair amount. Both are ways to not have to state a firm +- value. As long as you find the fine print it is easy to work out the real 'value' of a panel.

@@singlendhot8628and how do they perform as the temperature of the panel increases? Better or worse than REA?

@@StefanHolmes REA = Rolls Royce JA Solar = MG That is the best way to describe the two. There is no comparison.

Yes, we can't see why not. Although the latest versions are "ACM's" meaning the microinverter is affixed to the panel from factory.

Yes, they could. There's a video about vertical panels on RU-vid.

Anybody who understands solar can see these videos for what they are, misleading marketing.

Hi Mark, thanks for your comment. We have a side by side comparison coming to the channel in the coming months.

Would that not depend on if you place the insulation on the floor of the loft or the underside of the roof? My 13 year old system in the loft has no problems as the loft is configured to be cool even during the summer - air in via the eaves and out via vents installed in the roof. As for insulation there is 200mm on the loft floor.

Hi, thanks for your comment. GivEnergy don't advise against this. They recently released statement relating to the PAS 63100: 2024 advisory.

The benefits will be minimal. Bifacial are designed to be used where light can be reflected on to the back of them, ideally installed meters above the surface, not on a roof.

@@TheRonskiman The question was aimed at Heatable as they are the ones who installed the panels.

@@rogerthomas7040 I know, but do you really think they are going to answer the question? If answered honestly it would undermine / contradict their advertising, other option is to lie.

Hi Roger, thanks for your question. This gets asked a lot so we're putting a comparison test video together at the moment. All will be revealed. Importantly though, we only ever quote the front sheet power rating when sizing systems for our clients. Any upside is a bonus 😀

@@TheRonskiman Hi, thanks for your comment. We've answered the question above, we'll be uploading the comparison test in the coming month. All our proposals use the front sheet KWp ratings, which in this case is 440w.

I was wondering this myself, stands to reason it would work but to quicken the instal I'd probably use some kind of plastic or vinyl strips that adhere to the roof tiles just behind the solar units. I'd love to see some real-world testing on a system like that to see what kind of gaines are possible.

A gap of 4 metres? Some light does reach the underside, but the main use is to capture the light passes through the top panel.

@@grahamcook9289 yes I read that on some bifacial solar panel manual.

@@tangent2658 this is not made for roof. Bifacial are for solar farms, structure mounted systems and carports.

Hi, thanks for your comment. PAS 63100: 2024 related to recommendations around siting of batteries. GivEnergy have released their own guidance on this following the PAS 63100: 2024 release. Ideally, where space allows we would avoid loft spaces.

It’s best practice to not put them in the loft. But these guys are selling you bi-facial on a roof system which is pointless. They’re meant for ground-mount, car ports, areas with reflected light.

Just battery not to be installed in lift space.

Hi, thanks for your comment, the recent PAS 63100: 2024 update specifically related to recommendations around battery installations in lofts. Ideally, we'd install inverters in cooler locations however, space was limited here