Renogy 100 Watt Solar Panel Review

This is my hands-on review of the Renogy 100 Watt Monocrystalline Solar Panel.

I spent weeks testing it on its own as well as alongside other top 100 watt solar panels. I tested it with a multimeter, inspected its build quality and measured its power output on a sunny day.

After all that, I think the Renogy 100W Mono panel is the best 100 watt solar panel for most people. It’s my favorite combination of size, build quality and power output.

Its only real downside is price. It’s a bit pricier than most other 100 watt panels.

Full review: Best 100 Watt Solar Panels

Top Pick

Renogy 100W 12V Monocrystalline Solar Panel

The best 100 watt solar panel

Its combination of size, build quality and power output make this my favorite 100 watt solar panel. It’s the most compact panel I tested, making it a great option when mounting space is at a premium. It is a bit pricier than most other 100 watt panels, though.

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Solar cell type: Monocrystalline Max power (Pmax): 100W
Max power voltage (Vmp): 18.6V Max power current (Imp): 5.38A
Open circuit voltage (Voc): 22.3V Short circuit current (Isc): 5.86A
Dimensions: 42.4″ x 20″ x 1.38″
(1077mm x 508mm x 35mm)
Weight: 13.6 lbs (6.2 kg) weighed
14.3 lbs (6.5 kg) listed

Renogy Solar Panel Review

Unboxing & First Impressions

Upon arrival, I took the panel out of the box and gave it a quick rundown. It arrived well-packaged and in good condition. The box was sturdy and the panel was well protected.

The first things that stood out to me were its size and weight. It was noticeably smaller and lighter than other 100 watt panels I’ve used. I also liked its thick frame.

Everything looked in order, so I took it outside for some multimeter testing.

Multimeter Testing

I angled the panel toward the sun, propped it at the optimal tilt angle and took some measurements with my multimeter.

First I recorded the open circuit voltage (Voc).

I got a Voc of 22.2V. The panel claims a Voc of 22.3V at STC.

Next I measured the panel’s short circuit current (Isc).

I got an Isc of 5.66A. The panel claims an Isc of 5.86A at STC.

These are perfectly good results for a multimeter test. The open circuit voltage was spot on. The short circuit current was a little less than claimed, but I did this test in December when the sun isn’t as strong, so that’s to be expected.

Related: How to Test Solar Panels

Installation & Mounting

Of the five 100 watt panels I own, the Renogy Mono is the easiest to mount out of the box.

It has the most pre-drilled mounting holes of any panel I tested, which gives you a bit more flexibility in how you mount it.

Plus, its frame is 35mm thick. Many 100 watt panels have thinner 30mm frames. 5mm doesn’t sound like much, but in practice it makes a panel easier to mount.

Power Output Testing

To test power output, I connected each solar panel to a battery via an MPPT charge controller. Then I used a watt meter to measure each panel’s output in watts.

Performing a power output test

Here are the results:

The Renogy Mono output a max of 71.6 watts. The only panel that performed better was the WindyNation Poly, which output a max of 72.7 watts.

Note: I tested the panels at 33.7° latitude in early December.

Build Quality

The panel seemed well-built and held up just fine during my testing.

Its MC4 connectors were my favorite of all panels tested. I gave them a little tug test to test the crimps, and found no looseness.

I do think Renogy skimped a bit on their cables. This panel has 2-foot, 14 gauge (2.5mm2) cables, as opposed to the 3-foot, 12 gauge (4mm2) cables I’ve seen on other 100 watt panels. In practice these are negligible differences, though.

Everything else — from the panel glass to the junction box — looked solid.

Size & Weight

Here’s how the Renogy panel’s size (length * width) compares to other top 100 watt panels:

And here’s how its weight compares:

The Renogy Mono is the most compact 100 watt panel I tested. It’s also the second lightest, weighing only 0.1 pounds more than the Newpowa Mono.

Its compact size makes it a good option if you have space constraints, such as when mounting to a van, boat, RV, or small roof. It lets you generate the same amount of power in less space.

Key Specs

  • Solar cell type: Monocrystalline
  • Max power (Pmax): 100W
  • Max power voltage (Vmp): 18.6V
  • Max power current (Imp): 5.38A
  • Open circuit voltage (Voc): 22.3V
  • Short circuit current (Isc): 5.86A
  • Dimensions: 42.4″ x 20″ x 1.38″ (1077mm x 508mm x 35mm)
  • Weight: 13.6 lbs (6.2 kg) weighed, 14.3 lbs (6.5 kg) listed

What I Like

  • It’s an all-around great 100 watt solar panel. Its combination of build quality, power output and size made it my favorite of the five 100 watt panels I tested.
  • It’s small and compact. It’s the most compact 100 watt panel I tested, and the second lightest.
  • It has good power output. It placed second in my power output test.

What I Don’t Like

  • It’s a bit pricey. Renogy is one of the most popular brands in DIY and mobile solar power. As such, many of their products come with a small but noticeable price premium.

Who This Solar Panel Is for

  1. You have space constraints. Its compact size makes it great for mounting on vehicles and small roofs.
  2. You want a top 100 watt solar panel. After testing five of the best 100 watt solar panels, this panel was my favorite. I think it’s the best 100W panel for most people.

Who This Solar Panel Isn’t for

  1. You want a cheap 100 watt panel. As of this writing, it has the highest retail price of the 100 watt panels I tested. For a cheaper option, look at the Newpowa Mono or Rich Solar Poly.
  2. You have lots of space to mount your panels. In this case, I’d recommend looking at a polycrystalline panel. They are bigger and heavier, but cheaper.

Top Alternatives

The Bottom Line

After testing five 100 watt solar panels side by side, I think the Renogy 100W 12V solar panel is the best 100 watt solar panel for most people. It has the best combination of size, build quality and power output.

It’s best suited for people who want a monocrystalline panel or have space constraints, such as those mounting panels on a vehicle or small roof. If you have lots of space for mounting, I’d recommend looking at a cheaper polycrystalline panel.

A small ask: If you found my Renogy solar panel review helpful and are planning to buy one, please consider buying through one of my affiliate links below — I’ll get a small commission which will help fund more reviews like this one. Thank you! 🙏

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Alex Beale
Alex Beale
Hi, I'm Alex. I started Footprint Hero to help people reduce their environmental impact. My current obsession is DIY solar power projects, which I've been building since 2020.

5 thoughts on “Renogy 100 Watt Solar Panel Review”

  1. Whilst the renogy product might be acceptable, their customer support in my and others, experiences is diabolical, these are factors which should be taken into account when advising people to buy products

    1. Thanks John. Have had a bad experience with Renogy custom service myself. Haven’t contacted the other companies custom service numbers though, so not sure how they compare. Might include a note about that next time I update the reviews.

  2. Well explained Alex, i have a question
    How much power will this 100W solar panel produce per day on average per peak sun hour, like 70% or 80% of its total capacity? without counting any losses due to charge controller, inverter, or wiring

    1. Hey James, during a peak sun hour you’d expect any 100W solar panel to output around 100 watts for an hour (for a total of 100Wh). That’s because a peak sun hour is defined as 1 hour in which the sun shines at an intensity of 1000 W/m2, which is the level of solar irradiance under which solar panels are tested and rated (this is called STC or Standard Test Conditions).

      BUT a big variable here — beyond the losses you mentioned — would be solar panel temperature. Solar panels produce less power as they heat up. So if your panel is really hot during the hour then I’d expect it to produce less than that.

  3. Michael Conway-Brown

    I too have had terrible customer service from Renogy. Check the reviews and you’ll avoid Renogy.

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