Author Topic: Solar Panels  (Read 743 times)

Offline Gumb

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Re: Solar Panels
« Reply #15 on: April 26, 2019, 12:34:17 PM »
OK, got it now. That's what I do, just in a different way as there's no regulator on the panels themselves, being Ultralites.

Cheers, it's an interesting discussion.  ;D
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Offline peter_mcc

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Re: Solar Panels
« Reply #16 on: May 02, 2019, 09:10:35 PM »
So... following up... I've been chatting with someone on Facebook about solar panels so went looking to see what I should use.

I found some claimed 250W panels - for example this one:

The quoted dimensions are 1.335 x 0.67m = 0.89445m2. They claim 18% efficiency. Using that and standard illumination of 1000W/m2 means 180W/m2. So only really a 161W panel... not the 250W they are marketing it as.

All the other 250W panels I found were the same (or very similar) dimensions so it is unlikely that any of them are really 250W panels (using the standard illumination figure).

This one is even worse if you assume the quoted dimensions are correct:
Unsurprisingly the two most recent reviews complain that it doesn't produce as much power as expected... hahahaha

This one looks better:
It works out to be around 200W

Looking around more there some panels which look legit - eg
It is a 160W panel with an area of about 1.05m2. It's also $1560... so you could buy 8 or more of the cheaper ones. But the expensive one has a 5 year warranty, the cheap ones probably won't last very long (one of my 3 died within a year).

They also have cheaper ones  160W for $465 but with an area that matches the claimed output:

Interestingly a Road Tech Marine panel seems to check out as well:
Area is 0.94 x 0.69m = 0.6486m2 @ 170W/m2 = 110W (more than claimed because the dimensions include the border/etc which won't actually produce power).

I have no association with Solar4rvs or RTM and have no idea if their stuff is any good - they just have better search engine optimisation for what I searched for...

Offline Faraway

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Re: Solar Panels
« Reply #17 on: May 06, 2019, 12:17:19 PM »
Very interesting and useful knowledge to have prior to making a purchase.  Still rather like Gumb’s Original suggestion.  It’s good to have a specific product and supplier recommended.