Renogy 2PCS 100 Watt Solar Panels 12 Volt Monocrystalline, High-Efficiency Module PV Power Charger for RV Battery Boat Caravan and Other Off-Grid Applications, 2-Pack Compact Design

As soon as I received the panel's I unboxed everything and set them in the sun to check if they worked. First things I noticed is they are built really well, and they sent me 24 volt panels and I ordered 12 volt so a big plus for me, 96 volts of power from an expected 48 so again a big plus in my favor (After ordering a total of 22 of these they are all producing more than 100W each unfocused and YES they are a good deal). Next I pointed them at the sun and was getting more than rated voltage when in a direct angle to the sun, and I got a reading of 24.5 volts DC on all but 1 which was 22.8 volts DC with them pointing unfocused; in an attempt to imitate the angle they would be in a stationary system on the roof. Of course my opinion may change if they don't work long term but right now I couldn't be happier with the purchase. Edit: It's been a few months now using these panels fully off grid. And I couldn't be happier. Yes I could have spent a lot more money and had fewer panels by buying 300+ watt panels but space wasn't a worry for us money is. We would have spent quite a bit more per watt buying the higher wattage panels. The important thing is each and every one of my Renogy solar panels produces more than the rated wattage under full sun. It isn't a lot but we get over 3200 watts total under full sun with 30 panels now. Which means there is over 200 watts higher than rated wattage total. Thats 2 panels worth. I call them our ghost panels. My opinion of these panels and the company couldn't get better. The PowMr 5000W CC/Inverter we are using can take 450V to the MPPT with a max of 500V 16 amps. Two arrays of 15 panels each at 13 amps is where we are now, thats about 250 V 6.5 amps per array. We are going to add more panels to reach the 450V 16A input potential. Right now we only use battery power under full sun if we use the dryer or microwave oven, everything else is powered between say 8:00 AM to 6:00PM by our panel array which are not focused and is a bit small yet. That includes recharging our battery bank, watching TV, coffee on, lighting and the fridge. If the dryer and AC are on at the same time we may see a small draw on the batteries around 1 or 2 amps when the dryers heating element is powered, which is intermittent. Right now we are fairly balanced. The panels run everything in the house pretty much during daytime including recharging batteries, and the batteries at night; which means the panels are producing all the electricity we use. Adding a few more panels will end using any battery power during a sunny day and adding panels to reach 450V max will probably accomplish that on a cloudy day. And thats the last thing I want to mention. Even though power production does depend on how much light is blocked by clouds or shadows, they do produce power on overcast days. A thin layer of clouds won't appear to make much difference and even on a day with a few rain clouds around we will have power coming from the panels. So my rating is 100% 5 Stars and I'd add another 5 if I could. The panel that produced 22 volts was made wrong. One of the cells isn't connected and what looks like the solder strip is laying across the neighboring cell face. Still can't complain I purchased 12V panels.

Good energy results

They work really well

Update 2/5/23 Raised to 3 stars The Good: Output is exceptionally high at 114 watts or 14% above 100 watt nominal rating as pictured. Measured on a perfectly clear day at the very low ambient temperature of minus 15 degrees F. While most solar panels will put out higher voltage and hence more power at lower temperatures, these 36 cell, 100 watt modules exceeded my expectations. Your experience may vary depending on what you might be feeding with your system. This example shows four 100 watt panels feeding an Ecoflow Delta 2 power station with extra battery, see pictures. The Bad: Quality control at Renogy is poor. I bought 7 of these Renogy RNG 100D-SS panels, and while five were just fine, two were labeled in reverse polarity causing a short circuit. Look at the attached pictures to see that 2 separate 100 watt solar panels were incorrectly wired and labeled by Renogy Solar. One panel was marked positive on both wires. the second was labeled in reverse. Not good! Both were in the same box, with consecutive serial numbers, and both managed to get passed by QC. That mistake resulted in a short circuit and a lot of wasted time on the phone with Renogy. While the representative at Renogy was willing offer compensation of just 5% of my purchase price, I found this unacceptable as a solution for all the wasted time I spent going up and down ladders with a multimeter troubleshooting their inexcusable mistake. Not sure if I'd work with Renogy again as there's plenty of choices on Amazon for similar panels at similar prices. But if I do buy more, I will definitely double check polarity and their quality of workmanship. After reworking the wiring I was pleased to see the panels were still working well, in fact they all were putting out 114 watts, mainly due to the very low temperature outside. Definitely double check polarity with a volt meter if you buy these. In all fairness, Amazon's customer service experience was excellent, and much better than working directly with Renogy. This is why I buy on Amazon, customer service. Update 3/19/23 Overall a very good panel But there are some QC problems to be aware about. I purchased 9 of these so far and they all put out 100w or better. Two of them came wired or labeled with reverse polarity and caused a short circuit. I quickly discovered the problem and fixed it myself however there does appear to be a couple of dark discolored spots on one panel that might indicate over heating of a cell, possibly caused by the short circuit, possibly just came that way from the factory. Anyway before you install these panels definitely check them thoroughly for discolorations and correct polarity. They are otherwise excellent panels for the money.

I bought 4 of these about 8 years ago and put them on the roof at the ranch. After 8 years of extreme Texas heat, freezing, hail and high winds they're still pumping out 400+ watts daily. Recently purchased 8 more, arranged them in an 800 watt configuration, 2 strings of 4 panels wired in series then running in parallel. I have seen these panel push out over 800 watts even after connecting them with 100' extension! I convinced a good friend that these were the panels for his ranch, he purchased 5 of them wired in series and they power his cabin and charge his battery bank perfectly. I have seen these panels take abuse, dropped, hailed on, items dropped on them etc. I have never once, since I purchased my original panels for the ranch, cleaned them and 8 years later they're still pushing above the rated wattage. I know that there are other panels on Amazon that are cheaper, but if you're looking for a panel that you can set and forget, I think after 8 years of testing and abuse, Renogy has earned my trust. I'm getting ready to build another 800 array and you can bet these are the panels I'll use.