Lensun Semi-Flexible 100 Watt Solar Panel Review

I’ve always been curious about those super thin flexible solar panels. So I was thrilled when a company called Lensun Solar asked if they could send me one for review. It couldn’t have come at a better time for me. I’ve been kicking around the idea of building myself a portable remote ground panel for my boondocking adventures this fall. The 100-watt flexible panel they sent would be ideal since it is lightweight and can be easily mounted on so many surfaces.

First Look at the Lensun Solar Kit

The kit included a 100-watt semi-flexible solar panel Model LS-100FX2, a 10 amp PWM solar charge controller and battery hookup wires with alligator clips. They neglected to send me a set of MC4 cables to connect the solar panels MC4 connectors to the charge controller, so I picked a 15 foot set for myself locally.

Lensun 100 watt flexible solar panel

My first impression of the 100 watt Lensun flexible panel is quite good. It appears well-made and has an attractive looking flat black matte finish to the front side. It was even thinner than I had imagined at only 2.5 mm and very light weight at around 5-6 pounds. The panel is 43.3 inches long by 22.4 inches wide with 32 Sunpower solar cells laid out in 4 rows of 8 cells.

flex demo

On the front is a flush mounted IP65 rated waterproof junction box with 3 feet of MC wire and connectors. The backside is made of black fiberglass material rather than heavier aluminum.

Lensun solar panel junction box

The included solar charge controller is an inexpensive PWM unit which is adequate but nothing special in my mind. I will use it for test purposes but in the future, I plan to use my already installed Bogart SC2030 charge controller with the new panel. My current solar system consists of 4 – Renogy 100 rigid solar panels mounted on the roof. The new Lensun panel will be used in parallel with them.

Lensun solar kit

Real World Tests of the Lensun Panel

I decided to test out the Lensun 100 watt panel in two ways.

One – using the supplied PWM charge controller and measuring its output current with a multimeter.

Two – adding the Lensun panel into my existing RV solar system and measuring the increased current it provides.

Tests were done at approximately 10:30 in the morning at 50 degrees latitude on May 29th with a clear blue sky.

First Test: Using the Lensun Solar Kit

I let the four 6-volt battery bank in my RV run down to about 80 percent charge so it would be ready to accept as much amperage from the PWM controller as possible. I placed my multimeter in amperage mode in the positive output line of the controller.  With the panel laid flat on the campsite picnic table, I measured an output current of 5.8 amps at 13.2 volts.

Lensun Panel current output test

Next, I tilted the panel perpendicular to the sun for optimum power generation and measured a current reading of 6.9 amps. I was impressed, these amperages are as good as or better than what my 100-watt Renogy panels produce.

Second Test: Paralleled With My 4 Renogy Panels

For this test, I simply added the Lensun 100 watt panel to my existing system by wiring its output MC wires into my Bogart SC2030 Charge Controller then checking the total solar current being produced using my Trimetric TM2030-RV battery system monitor. I laid the Lensun panel flat on the RVs roof beside my 4 – 100 watt Renogy panel array.

Total solar current output was measured at 24.4 amps. I then disconnected the Lensun panel and the reading dropped to 19.1 amps a difference of 5.5 amps.

Note: The Renogy panels have slight tilts to them due to the front roof slope of my fifth wheel trailer.

Lensun panel next to my Renogy panels

Lensun Flexible Solar Panel Features

I’ve done a fair bit of research on the technology employed in these Lensun solar panels and what makes them so efficient and durable compared to previous cheaper flexible panels on the market. Here are the main features I’ve discovered:

– To start with they use high-quality solar cells – Grade “A” Sunpower Back Contact monocrystalline cells with high efficiency up to 22%. Many cheap panels use grade “B” or “C” cells.

– The panel uses a more expensive material (imported from Japan) called ETFE (Ethylene Tetrafluoroethylene) versus PET (Polyethylene terephthalate). The ETFE film layer absorbs light better with less reflection leading to more power per square inch.

ETFE vs PET films


– The ETFE material is much more durable that the cheaper PET for a longer lasting panel with less surface deterioration over time. The ETFE material bonded with the fiberglass back sheet makes a stronger panel than a cheaper PET film one with less chance of cracking or water intrusion.

– The Lensun semi-flexible panel may be walked on with soft soled shoes.

Soft soled shoe on Lensun panel

– Easy to mount on almost any surface using the 4 built-in grommets, adhesive or heavy duty Velcro, perfect for RVs or boats.

Lensun 100W 12V Black Fiberglass Semi-Flexible Monocrystalline Solar Panel for 12V Charge Battery on Boats, Caravans, Motorhomes, Yachts, RVs
Price: $279.00
2 new from $279.000 used

My Lensun Flexible Solar Panel Demo Video

Review Conclusions

I have to say I’m super impressed with the build quality and power output of this Lensun Semi-Flexible 100 watt solar panel. The tests results turned out much better than I had envisioned. It has encouraged me that it will make a terrific lightweight remote panel for my boondocking RV solar system. I look forward to building a tiltable frame for it this summer. Stay tuned to the blog for a post and video with build details and demo.

Lensun 100 watt solar panel

I think the Lensun semi-flexible panels would really shine for solar installations on RVs such as a campervan, Airstreams or small teardrop travel trailer where roof space is at a premium and curved. Or where traditional rigid solar panel mounting methods aren’t very desirable.

If I have to come up with anything negative to say it would be the lack of reviews and history out there on the Lensun solar panels. I couldn’t find much with an internet search other than a few references in some sailing and boating forums.

So far I give them a Love Your RV! thumbs up.  But, as with any new technology, no one knows how things will perform long term in the real world. I’m cautiously optimistic that these flexible solar panels designed with a harsh marine environment in mind will withstand the test of time in the RV world. I will definitely be putting it through its paces come this winters snowbird season in the desert sun.

See More Love Your RV Product Reviews

Review of the Lensun semi flexible solar panel ki by the Love Your RV blog - http://www.loveyourrv.com/ #solar #boondocking

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  • windship

    Finally, something for mariners to get excited about too!

    How well do these work if part of the panel is in shadow? I know some panels require 100% exposure to work at all, but on my boat, that’s not always achievable.

  • gr8simpson

    If you were just beginning to look at a 100w solar system which one would you be leaning towards and why.

    • Generally, I would tell weekend RVers if they don’t have plans for future expansion of the system to get a little portable suitcase system. Since you can move it around and tilt it to get max power out of it. 100 watts isn’t very much so you would want to really maximize it. Also, it’s easy to setup and is complete with everything you need. Something like this Renogy one- http://amzn.to/1VAdKj4
      If it is something that will be mounted on a vehicle and part of a system with plans to grow in the future then lots of things come into play so hard to answer.

      • gr8simpson

        Thank you Ray for not only your review but your quickness in responding. My issue with these portable solar systems is that my house batteries are under my entrance steps to my MH and with grandkids coming in and out, it’s a disaster waiting to happen. All of the portable systems I have seen have about 10 feet of wire with alligator clips to attach to the batteries. I have not seen anyone using a different connection system with the portables. Am I missing something here?

        • Some folks make up their own connections, I’ve even seen some using heavy extension cords.
          How many house batteries do you have? The general rule of thumb for solar is to have at least 100 watts for every battery you are trying to charge up.
          If you have a “motorhome” I assume a large Class C or A then 100 watts is likely not near enough power for you for dry camping. You would need to install at least 300-400 watts of solar before you’d see much difference versus just running the generator once in a while. 100 watts works for folks in campervans or truck campers with very meager power needs, but not for larger RVs.

  • I think the big issue was gluing the panels to an RV roof. The generated heat could lead to reduced efficiency of the panel.

    • Ah, I see. We have a sunny 85 degree day coming this weekend. I’ll lay the panel flat up on the RV roof at mid day and compare the temps readings between it and my Renogy panels with my IR gun then compare output currents.

    • 87F degrees here today so I laid out the panel and checked temp after an hour. It hit 146F at that temp it was down about 20% in output current. I tested by hosing it down to cool it to 75F and measuring. Some high wispy clouds so not full output but was getting 4 amps when panel was 146F and 5 amps when 75F.
      High temps on the Renogys were 118F so definite the these flex panels will cause extra heating to the RV roof so AC will work harder.

      This time of year I don’t need full efficiency since it’s light out to 10 pm here 😉 and when I do in the desert during winter the temps will be lower, so should work well for my application as a portable ground panel.

      I guess the big thing will be if this new ETFE film coating they are using will be able to handle the heat without panel deteriorating as the previous PET technology suffered from. Many would yellow and crack.

  • One of the negatives of previous flex panels was the heat generated on the back. Have you measured that?

    • No John, When I did pick the panel after laying in the sun it wasn’t too hot to hold but I have an IR gun so will do some measurements and add to the article, thank!.
      I would think the fiberglass backing would be better for that problem versus aluminium.