We purchased the 100 watt panel to go along with our Grecell HW01 power supply. The solar panel is constructed very well, and feels to be very high quality. It folds in half for excellent portability, and has straps that snap to keep it closed. The storage pocket on the back is nice for keeping all the cables and adapters in one place, ready to use. The included cables and adapters will allow this to be used with many different powerbanks. Kickstands, one per side, are sturdy, and prop it at a good angle to get plenty of surface exposure to the sun. During my initial tests, with small clouds visible, I was getting up to 86 watts during the peak of the day. It charged my bank up to 100% from 68% rather quickly. Our powerbank is used for small items, and device charging while camping, and also to run my astronomy equipment throughout the night. This panel will make recharging easy during the day, without having to worry about running my vehicle battery down.

Ive been using this panel for a little over a month now. I really like to use things in multiple situations and gauge its effectiveness; This panel is perfect for what I am using it for. I wanted something that was lightweight, easy to store and transport to supplement my mounted solar panels. I don't always have the best options for parking in the sun, and the angle is never perfect with mounted panels.

What I really wanted was a panel I could easily and quickly setup in the best location to supplement my charging. I have been extremely pleased with this purchase. It really filled the niche I needed with my setup in my camper van, and I also found myself using it in a lot of other applications because it is very portable and light weight.

1. Very portable.

I really liked how its all self contained, the cables, adapters, all come in a zipper pouch, and I ended up using it to store my 20 ft cables as well, so when it is time to set it up, its really a "Grab and go " situation. The handles are very nice, and they have magnetic clasps so the unit stays closed until its time to use it. I really liked this feature, because it kept it safe, and stopped anything from slipping inside the panel when I was storing it.

The feet are velcro secured and right on the unit, its really nice that they secure so well, and they are always right there to use. That is one of my favorite things about this panel is that its all " Self contained " I do not need to look for feet, cables, or anything, because its all right there.

2. Well made

The construction is very sturdy, I've been using it for right around a month at this point and it still feels and looks new to me. Its very easy to clean/keep clean, the material is strong. I really love the zippered pockets and velcro hold downs for the feet. It keeps it all "Tight" and very quick to store and grab when I want to use it.

3. Comes with cable and adapters

I really liked how it came with extra cable length, and adapters for any device you might want to charge. I have some older power stations and was really surprised to be able to just directly charge those. It really made it easy to work it into my solar setup. It saved me money too.

4. Great power

Its a 100watt panel and I felt the output was very nice. Being so portable, it was very easy to set it up in the best location for the area I was set up in. I used an extra 20 ft cable I had as well, so it is always optimal. This really was clutch for me as it kept me from always being "Just about" there to fully charged on all my stuff. It is really perfect for my application.

Overall, I love this panel. It is so thin and lightweight, it just fits in a little niche I had for it like a glove. I have not had a single issue with this unit, and I cant imagine being without it anymore really. Just being able to add that extra wattage with the perfect output to my setup sent it to total perfection. Its just so nice how it folds in half and protects itself. I would really give this a try if you want something, Portable, well built, and effective.

Something else to add. I have been just grabbing this single panel and a power station for car trips and even a short hike. I really love the portability of this VS my massive fixed panels.

Top notch panel. Easy to fold away. Love the built in support legs. Even if they can be a little cumbersome to move once out, they were perfectly fine for a fold-up panel. Very flexible and pretty stable. The power output is great. During overcast days even during the rain, I was still getting somewhere around 7 to 15 watts. During sunny but semi-clouded days I was getting around 100 to 120 watts. On full sun days I was getting 170 plus. They stood up to full storm weather so the durability is great. They connected into my power bank easily with the proper connector and they kept my portable power station fully charged during sunny days.

At first glance, this Grecell 100W looks like a copycat of the Jackery SolarSaga 100 with its color scheme, folding design, and handles that close magnetically.

IN A NUTSHELL

The Grecell 100W, like the Jackery Solarsaga 100, just folds in half and is held together by strong magnets, accented by a rigid, bright-orange carry handle across the top. Within the built-in carry pouch is a built-in MC4 connector cable ready to be plugged into a battery power station with an appropriate extension cable. On an overcast morning, it had achieved as much as 59W of output whereas the Jackery SolarSaga 100 got 53W. The differential was small, and so I tested it again on a clear, sunny day. The Grecell achieved 84W and the Jackery got 72W. That's pretty good efficiency as most monocrystalline solar panels lose at least 25% due to power conversion. A built-in kickstand helps orient the panel at an optimal, 45 degree angle for maximum sun exposure, and a built-in pocket allows for cables to be stored. Note that this solar panel is NOT waterproof.

It should be kept out of the rain, but then again, if it is raining, the sun probably won't be out. Multiple adapters are included and I tested connectivity with Jackery, Goal Zero, and an off-brand Rockpals battery power station. All three worked with this panel as expected. As long as the power station is able to accept the panel's 20V of output, you are golden. I also connected it in parallel with the 18V Jackery SolarSaga 100, and that took the panels from 53W/58W to a combined output of 102W. You should almost NEVER connect multiple solar panels in sequence/a series -- you should almost ALWAYS hook them up in Parallel with a Y-split or combiner cable. (Goal Zero has a 4x combiner cable to hook up to 4 solar panels).

Overall, the Grecell 100W solar panels are beautiful, sturdy, efficient, and portable and worked well with a variety of battery power station vendors and solar panels. Having the MC4 connector out of the box makes the Grecell compatible with an industry-standard connection, but some power stations may only accept APP (Anderson) connections -- in that case, use the included MC4-to-APP adapter cable.

TIPS/NOTES

- Panel lifespan: Panels generally die/become inefficient between 25-30 years

-- They may last longer, but would produce less energy

- Solar panels work best outdoor under full sun exposure

-- Although the panels will work under the shade or behind windows, charging efficiency is greatly diminished

-- Panels will STILL charge under cloudy conditions. So, keep the panels out even if you do not see the sun

-- Operating temperature range: 14F to 149F (-10C to 65C)

-- ONLY the solar panels can (and should) be directly under the sun while charging a battery power station

--- Keep the power station in the shade to prevent overheating

- ALL panels must be uncovered to generate a charge

-- Do not completely cover one or more panels or the charging will stop

- To maintain solar efficiency, the panels should be kept clean

-- Remove dust with a soft brush and wipe with a damp (NOT wet) cloth

-- Any residue, such as tree sap, should be removed as soon as possible

-- Keep panel away from water that spray at greater than 60 degree angles

-- Keep panel away from low-pressure (or stronger) water jet spray

-- Do not submerge the panel under water

-- Panels will work longer if they are kept away from water altogether

- Do NOT bend the panels more than 30 degrees or risk breaking them!

- Keep the panels away from fires and heaters

CHARGING TIMES

When using solar panels to charge battery power stations, the amount of energy the battery may accept could be throttled to prevent overcharging.

Example: Jackery Explorer 1000 slowed incoming wattage from 70-80W to about 50W once it reached 70% battery charge.

HOW MANY WATTS DOES A DEVICE USE?

- Calc: Watts used by device = Voltage x Amperage

- If a vacuum is 120V and 9.5A, it uses 1,140W

HOW LONG DOES IT TAKE TO SOLAR CHARGE A BATTERY POWER STATION?

- Calc: Hours to charge battery = Battery capacity (Wh) / (Panel Wattage x [0.5 or 0.75])

-- In a perfect lab environment, solar panels charge at the indicated wattage (ie. 100W)

-- Expect to only receive 50-75% on a good, sunny day (ie. 50W – 75W), depending on environmental conditions, panel's age, and component quality

-- Tip: Even if it is overcast, the panels will STILL collect solar energy. Keep charging!

- Charging with a 100W solar panel

-- Jackery Explorer 500: As fast as 6.7 hours [500 Wh / (100W x 0.75)]

-- Jackery Explorer 1000: As fast as 13.3 hours [1000 Wh / (100W x 0.75)]

Wow..... nice, compact, efficient panel. Even with the sun 60 degrees off, 45 degrees high with my panels hanging on vehicle..... I was able to pull 160w. These far exceed performance of my last panel. The panels appear much different than the Amazon picture. An obvious upgrade to a much better performing panel. A few moving parts and pieces but nothing too complicated to set up. My one recommendation to Grecell is to add a USB-C port inside the zippered bag where panel branches into the MC -4 cable. The addition of a USB-C port would make this a stand-alone useable panel without a solar generator.

5-stars - really impressive performance.

I bought this 240W foldable solar panel mainly for camping and as a backup at home. It’s simple to set up, just unfold and face it toward the sun. The foldable design makes it easy to carry, and it doesn’t take up much space when stored.

So far, it has worked reliably with my power station, giving steady charging during sunny days. The build feels sturdy but not too heavy, and the waterproof feature is a nice extra for outdoor use. I like that it comes with multiple connectors, so it’s compatible with different devices.

Overall, this solar panel does what it promises. It’s not meant to replace your main power, but it’s very practical for camping, RV trips, or emergencies. I’m happy with it and think it’s a useful and reliable choice.

Very impressed with this Grecell 200 watt portable panel. Not only was the price amazing, but the quality and the function of the panel lives up to Grecells reputation. I purchased this panel to charge 2 x100ah lithium batteries and to keep my 12v compressor fridge running. I hooked it up to test it and this is in January when the sun is low. It already hit 144 watts and I'm sure it will do much better when we get some real sun for extended periods of time. Very happy how well it works and it's compact size. Easy to haul and setup too. I'm running a 100/30 Victron charge controller inside my camper. I have a 6 foot cable with a anderson connector from the MPPT controller out through the old lead acid battery vent hole in the side of the camper. I then connect that 6 foot cable to a 30 foot extension cable to the solar panel. Works perfectly! Very excited to do some off grid camping with this setup. Thanks Grecell!

Appears to be a well made solar panel BUT, it does not have a terminal end that will plug into a Jackery 300. It has quite a few terminal ends that come with it, but not the one I need.

A very good, useful, handy product. I get 60-80W power on a sunny day. Easy to carry. Cable comes with multiple connectors. Very useful in charging solar inverter. Worth the buy