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FlexSolar 20W 12V Solar Panel Battery Charger

Curated from 130 real Reddit conversations

Refreshed on: January 29, 2025

FlexSolar 20W 12V Solar Panel Battery Charger

Brand: FlexSolar

Price: $49

Snoop Score:

2.3

Sentiment

0.0

Popularity

0.0

Technical

4.4

Buy on Amazon for $49 See All Solar Battery Chargers & Charging Kits Reviews

As an Amazon Associate, I earn from qualifying purchases.

Snoop's Take

The FlexSolar 20W 12V Solar Panel Battery Charger is designed to efficiently charge and maintain various 12V rechargeable batteries using solar energy. Featuring a built-in charge controller, it prevents overcharging while ensuring that your devices are ready for use, making it suitable for cars, boats, and outdoor electronics. Consumer feedback highlights a common sentiment regarding the effectiveness of this solar panel. Many users have pointed out that, "solar is slow and doesn't have enough amperage to quickly charge a phone," and others have expressed that it can take several days to charge devices effectively, stating, "it takes like 3 days of sun to charge to 50%." This suggests that while the product is useful for maintenance charging, it may not meet the expectations for fast charging needs, especially for larger batteries or direct device charging. In conclusion, the FlexSolar 20W Solar Panel is recommended for those looking to maintain battery levels over time rather than for quick charging solutions. Users seeking immediate power for devices may find alternative solutions more satisfactory.

Not for you? Check out our other rated Solar Battery Chargers & Charging Kits

when I use a solar charger, the battery drains faster than without one.
Insightful Chatter

Solar is slow and doesn't have enough amperage to quickly charge a phone, that's why it's used to charge batteries.
Negative Feedback

2.3

FlexSolar 20W 12V Solar Panel Battery Charger

Buy on Amazon for $49

Vehicle Battery Maintenance

3 / 10

Marine and RV Applications

3 / 10

Off-Grid Power

3 / 10

Battery Preservation

3 / 10

See how this compares to all Solar Battery Chargers & Charging Kits

Where it needs some work!

Areas to watch—feedback on possible improvements.

Solar is slow and ineffective for direct phone charging.

“Solar is slow and doesn't have enough amperage to quickly charge a phone, that's why it's used to charge batteries.”➕

“Don’t use a solar panel to directly charge your phone.”➕

“Student uses light on phone to charge portable solar battery so that he can charge his phone...”➕

“It's like a race between solar and phone battery. So who won?”➕

Solar panels take days to charge devices effectively.

“Good investment in my opinion.”➕

“They can take days to charge a modest sized bank.”➕

“the efficiency of a solar panel is like 15%-20%.”➕

“Small panels will generate very little power.”➕

Solar panels do not produce enough energy to recharge efficiently.

“You are much better off getting a decent solar panel and using it to charge normal powerbanks.”➕

“Small. Battery packs with built in solar are worthless.”➕

Solar is slow and ineffective for charging larger batteries.

“It takes them more than a day to charge a relatively small car battery.”➕

“To do it in any meaningful way requires far more panels than you might expect.”➕

“on one hand it works on the other it might not be *practical.*”➕

“Are solar chargers useful? I won't have any electricity where I am going, so just wondering”➕

Not practical for charging electric vehicles.

“it's possible but not practical.”➕

“no, it's not practical for a trans continental excursion.”➕

Not effective for direct charging of devices

“I'm looking to install basically a trickle charger using a like harbor freight (cheap) solar panel that I can put up while I'm not there.”➕

Slow charging speed for devices.

“It takes like 3 days of sun to charge to 50%.”➕

Solar panels are too small for effective charging.

“They are crap”➕

“I had one that was basically just a normal power bank with a solar panel slapped on as an afterthought.”➕

“Its a funamentally flawed design which is ouperformed by just having a seperated power bank and solar panel.”➕

Solar is slow and ineffective for charging devices.

“I think a solar charger for a phone is too slow and not the best use of solar set-up.”➕

Not effective for direct charging of phones.

“Better not hook up your phone directly too the solar panel because it will get hot in the sun and your phone's battery doesn't really like the fluctuating amperage coming from a solar panel.”➕

Compare On All Talked About Dimensions

Product Name	Price	Score	See Details	Buy Now
ZOUPW 30W 12V Solar Battery Charger	$69	8.6	Details	Buy
POWOXI Upgraded 7.5W Solar Battery Trickle Charger	$39	7.5	Details	Buy
SUNER POWER Waterproof 12W 12V Solar Battery Charger	$50	7.3	Details	Buy
SUNER POWER 20W 12V Solar Battery Charger & Maintainer	$85	7.3	Details	Buy
Sun Energise 10W 12V Solar Battery Charger Maintainer PRO	$55	7.3	Details	Buy
SUNER POWER 30W 12V Solar Battery Charger Maintainer	$89	6.9	Details	Buy
POWOXI 12V Solar Car Battery Charger	$59	6.7	Details	Buy
Sunway Solar Car Battery Trickle Charger & Maintainer	$22	6.6	Details	Buy
SUNAPEX 12V Solar Battery Charge Kit	$21	6.4	Details	Buy
SUNAPEX 20W 12V Solar Panel Battery Charger Maintainer	$49	6.1	Details	Buy
Sun Energise 25W 12V Solar Powered Battery Charger & Maintainer	$89	4.4	Details	Buy
Renogy 10W Solar Trickle Charger Portable Battery Maintainer	$25	4.2	Details	Buy
Topsolar 10 Watt 12 Volt Solar Trickle Charger	$19	3.9	Details	Buy
Saillong 10W 12V Solar Car Battery Charger Maintainer	$19	3.9	Details	Buy
Sunway Solar 16FT Battery Charger Extension Cable Adapter	$16	2.4	Details	Buy
FlexSolar 20W 12V Solar Panel Battery Charger	$49	2.3	Details	Buy

Core Power Plays

The specs and strengths that make it shine.

Users prefer larger solar panels for better efficiency.

“The one you're linking to is hot garbage, though, and not what I'm describing.”➕

Hidden Hero Hacks

Unexpected tricks and side‑door uses you’ll love.

Many users recommend using solar panels to charge battery packs instead of directly charging devices.

“Charged the anker battery during the day, used battery to plug phone in at night.”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’

Experiences with solar setups can vary widely by environment.

“Too much cynicism against solar panels...”➕

“You do realize solar panels are extremely popular on expeditions?”➕

“Maybe he wants to charge lappy later?”➕

“Said the Renogy salesman.”➕

Challenges with battery maintenance in various settings.

“I think what made it work was the summer daylight length.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.

Challenges with battery maintenance in older vehicles.

“when I use a solar charger, the battery drains faster than without one.”➕

“Sounds like you either have a high parasitic draw or a bad battery.”➕

“Not on a 2001. Maybe an 80s truck.”➕

“the battery is rarely ever 'dead'.”➕

Challenges with battery maintenance in older vehicles

“Best Solar Charger/Battery Bank Under $100?”➕

Challenges with solar panel efficiency in different setups.

“Thanks for all the feedback. It looks like this is something that wouldn't help me -- I'm thinking I'd be better off just buying a couple more regular power banks.”➕

“Make sure you get one with fold out panels, the ones that are just attached to just the housing of the battery bank produce almost zero power.”➕

Varied experiences with solar panel efficiency.

“Can you charge an EV using portable solar panels? I did a Google search to see if you can purchase portable solar panels like the ones seen on campsites, trailers, etc.”➕