ECO-FRIENDLY - 4 Pack 400W Solar Panel 100W 12V Monocrystalline Module for Off-Grid Solar Power for Home Camping Boat Cabin Caravan

is a "DIY/semi-professional" level panel/kit that is positioned as economical, with good assembly equipment, with quality frame and glass materials, and designed for off-grid, farm, light house, etc. uses. Aluminium frames wider than usual (35 mm vs ~30 mm) which improves stiffness. Low-iron 3.2 mm glass that improves light transmission and resistance. Good wind and snow resistance in field trials. "high conversion efficiency" and good performance even under suboptimal conditions.

I have purchased quite a number of these panels and I’m finally getting around to submitting a review. I've tested a range of panels now, including Renogy, Goal Zero, no-name brands. And these panels have generated relatively the same amount of energy as the rest. I typically expect 70% of the rated output as a performance target, and these panels had no problem reaching 70 Watts. On cold days with perfect sunshine I’ve gotten up to 90 watts, but this isn’t something I count on. The panel size and cable length is also on par with the other brands, so there isn’t much to differentiate it from them EXCEPT for the price, which is amazing. I bought these on sale for $46.50 / panel, not expecting much, but I have been very pleased with them. In comparison, the name brands are easily $120+ / panel. So cost per watt is just amazing! I’ve been using them for about a year now, without any noticeable deterioration or performance issues, so we’ll see how they do in the long run.

This was a no-brainer of a purchase. Easy to install, very reasonable price, and keeps my auxiliary power system charged very reliably. I got the brackets to screw them down to my roof, but it's a flat roof, and it doesn't get very windy where I live. so I just set them there and ran the cable down from them, and they've worked fine ever since.

I was debating whether I wanted to add Solar to my battery backup system for emergencies. The price of these came down low enough ($0.50/W) that I figured I should just do it. I saw some mixed comments about their performance, but decided that for the price I didn't care if they got to the full rated power. I have a set of 8 of these in series with a MPPT system at 30 deg N latitude in July. The peak power out I've managed to achieve so far is 600 W (rated 800), but I don't have them mounted at the perfect angle at this point, and while it's pretty clear, there may be some high thin clouds, so I'd say that's pretty close to specs. I will say they are _extremely_ sensitive to shading. Shading even one cell in one panel causes a very significant power drop in this configuration, but that behavior is pretty much expected for this type of setup. Assuming you can get these well mounted they are absolutely reasonable for a budget solar setup, and at 18V, you can get them working with the newer high voltage MPPT systems with a small number of cells. I'm very satisfied.

One box was a little beat up but there doesn't appear to be any actual damage to the solar panel, itself, beyond a slight ding in one corner of the frame. I won't have more info until I can install them on my boat when the weather gets quite a bit warmer.