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expiredRed_Liz | Staff posted Feb 11, 2025 03:46 PM
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expiredRed_Liz | Staff posted Feb 11, 2025 03:46 PM

ECO-WORTHY 7.5W Waterproof Solar Panel 12V Battery Trickle Charger Maintainer

$16

$31

48% off
Amazon
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Deal Details
ECO-WORTHY US via Amazon has ECO-WORTHY 7.5W Waterproof Solar Panel 12V Battery Trickle Charger (Cars, Trucks, Boats, Lawn Mowers, RV, Tractors) on sale for $31.18 - $15.59 (50% off w/ promo code 50HWX8TU at checkout) = $15.59. Shipping is free with Prime or on $35+ orders.

Thanks to Slickdeals Staff Member Red_Liz for finding this deal.

Product Info:
  • A+ grade monocrystalline silicon wafers have a conversion efficiency of up to 23% to maintain a consistent output of 7.5W.
  • The solar panel is bendable to fit windscreens and has a strong hold on the 4 PVC suction cups.
  • IP64 waterproofing and UV protection.

Editor's Notes

Written by SlickDealio
  • About the deal:
    • This matches the previous +35 Frontpage Deal in December 2024.
    • Please see the original post for additional details and give the WIKI and forum comments a read for helpful discussion.
  • About the product:
    • This has a 4.3 out of 5 star overall rating based on over 100 reviews.
  • About this Store:

Original Post

Written by Red_Liz | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
ECO-WORTHY US via Amazon has ECO-WORTHY 7.5W Waterproof Solar Panel 12V Battery Trickle Charger (Cars, Trucks, Boats, Lawn Mowers, RV, Tractors) on sale for $31.18 - $15.59 (50% off w/ promo code 50HWX8TU at checkout) = $15.59. Shipping is free with Prime or on $35+ orders.

Thanks to Slickdeals Staff Member Red_Liz for finding this deal.

Product Info:
  • A+ grade monocrystalline silicon wafers have a conversion efficiency of up to 23% to maintain a consistent output of 7.5W.
  • The solar panel is bendable to fit windscreens and has a strong hold on the 4 PVC suction cups.
  • IP64 waterproofing and UV protection.

Editor's Notes

Written by SlickDealio
  • About the deal:
    • This matches the previous +35 Frontpage Deal in December 2024.
    • Please see the original post for additional details and give the WIKI and forum comments a read for helpful discussion.
  • About the product:
    • This has a 4.3 out of 5 star overall rating based on over 100 reviews.
  • About this Store:

Original Post

Written by Red_Liz | Staff

Community Voting

Deal Score
+41
Good Deal
Visit Amazon

Price Intelligence

Model: ECO-WORTHY Upgraded 7.5W Solar Car Battery Charger Maintainer 12V Waterproof Solar Panel Portable Solar Trickle Charger for Car Truck Boat Lawn Mower RV Trailer Tractor ATV Utility Vehicle Battery

Deal History 

Sale Price
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Current Prices

Sort: Lowest to Highest | Last Updated 9/16/2025, 11:36 PM
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Amazon$19.54

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Top Comments

FairWinter2721
293 Posts
26 Reputation
i own this. one advantage is that it came with both alligator clips AND a very handy OBD2 connector. the OBD2 allows charge thru OBD2 port as an option.
MultiMatrix
573 Posts
83 Reputation
I don't see anywhere on the product page that shows it includes odb2 charging adapter...

Edit: I decided to purchase anyway and just received the unit, and it did come with an ODBII adapter. you were absolutely right FairWinter. Thank you!
big mike
7274 Posts
1697 Reputation
This is not correct, solar panels not exposed to light most definitely USE electricity, also most of these have status lights or other circuits that use electricity. If the panel isn't working right to create electricity (or isn't exposed to enough light during the day) it's definitely possible for it to drain a battery. Better/industrial systems have controllers that shut the panels off at night so they aren't using power out of the storage system.

78 Comments

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Pro
Feb 12, 2025 06:34 AM
657 Posts
Joined Nov 2023
bluzcluz
Pro
Feb 12, 2025 06:34 AM
657 Posts
Can this panel be rigged to another device so it can connect to 110V devices for a direct charge? This is more cost effective than buying a portable generator. I would like to use it for camping or a day at the beach.
Pro
Feb 12, 2025 06:46 AM
409 Posts
Joined Sep 2014
icantsleep
Pro
Feb 12, 2025 06:46 AM
409 Posts
The same brand has the 10W model for $23.99 that also includes a cigarette lighter connector

https://amazon.com/dp/B017K6PH1S
Feb 12, 2025 09:47 AM
38 Posts
Joined Mar 2022
HonestPenguin348Feb 12, 2025 09:47 AM
38 Posts
Bought this, connected it up and my car battery was totally dead when I went to go move it later that night. Another solar charger years ago ruined my rpm gauge in my cluster …
4
Feb 12, 2025 11:40 AM
120 Posts
Joined Jan 2014
DelawaresaceFeb 12, 2025 11:40 AM
120 Posts
Quote from bluzcluz :
Can this panel be rigged to another device so it can connect to 110V devices for a direct charge? This is more cost effective than buying a portable generator. I would like to use it for camping or a day at the beach.
Technically, yes you can. But you would need two more devices, not one. This solar panel turns photons into electrons. You would need a battery to store the electrons as DC power and then an inverter to convert the power from DC to AC. Basically, one of the portable generators you mentioned. There's no way to convert photons from the Sun directly into steady 110V 60Hz AC power. I don't think physics works that way.
1
Feb 12, 2025 01:15 PM
591 Posts
Joined May 2017
BillytheGOATFeb 12, 2025 01:15 PM
591 Posts
Quote from BlueOvalStangGT :
Any idea how efficient this would be in a shaded area? I'd love to have power to my boat but it's pretty well shaded and I don't know if this would put out any juice. Not looking for too much just to keep them topped off when it sits.
Shade mean it'll get very little charging, if any. Don't recommend this for your use unless you can prop it in the sun.
Feb 12, 2025 01:28 PM
7,274 Posts
Joined Dec 2006
big mikeFeb 12, 2025 01:28 PM
7,274 Posts
Giving this one a shot, the last one of these I bought I had the same experience as the other poster that it drained the battery more than it charged it.
1
Feb 12, 2025 01:32 PM
7,274 Posts
Joined Dec 2006
big mikeFeb 12, 2025 01:32 PM
7,274 Posts

Our community has rated this post as helpful. If you agree, why not thank big mike

Quote from Luigis3rdcousin :
I would ignore that review because that's simply not possible with solar lol. Power is one way.

Unless they connected it backwards. OR they didn't remove the plastic wrapping from the metal tongs and the battery drained because it didn't get power. I had a sibling replace his car battery and his car wouldn't start because he didn't remove the plastic from the battery terminals. There's lots of people like this out there.
This is not correct, solar panels not exposed to light most definitely USE electricity, also most of these have status lights or other circuits that use electricity. If the panel isn't working right to create electricity (or isn't exposed to enough light during the day) it's definitely possible for it to drain a battery. Better/industrial systems have controllers that shut the panels off at night so they aren't using power out of the storage system.
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Feb 12, 2025 01:33 PM
54 Posts
Joined Dec 2024
SharkToothedGrinFeb 12, 2025 01:33 PM
54 Posts
Quote from HonestPenguin348 :
Bought this, connected it up and my car battery was totally dead when I went to go move it later that night. Another solar charger years ago ruined my rpm gauge in my cluster …
No It did not.
2
Feb 12, 2025 02:18 PM
4,024 Posts
Joined May 2006
ArcticatFeb 12, 2025 02:18 PM
4,024 Posts
I hate all these "yes it does & no it does not" arguments. First you go down the rabbit hole researching these claims with no definitive (and censored) results, after all that you still need to test it yourself, leading to you purchasing the item. Seems to be all on purpose & part of the plan....AI figured out how to accomplish this. At least AZ has a great return policy.
1
1
Feb 12, 2025 03:28 PM
1,237 Posts
Joined Jul 2009
ViciousXUSMCFeb 12, 2025 03:28 PM
1,237 Posts
Quote from icantsleep :
The same brand has the 10W model for $23.99 that also includes a cigarette lighter connector

https://amazon.com/dp/B017K6PH1S
I gotta admit this seems really cool for under $25 I think I just found a new practical toy to play with.

I have a sunroof in my truck too Smilie wonder if pushing power thru the 12v port in the cabin actually works, you would think it would have a diode or something to prevent backflow.

But I also have power lines right under my seat for my ham radio that are hooked directly to the battery and even has a startup relay to protect from surge.
Feb 12, 2025 03:47 PM
7,274 Posts
Joined Dec 2006
big mikeFeb 12, 2025 03:47 PM
7,274 Posts
Quote from ViciousXUSMC :
I gotta admit this seems really cool for under $25 I think I just found a new practical toy to play with.

I have a sunroof in my truck too wonder if pushing power thru the 12v port in the cabin actually works, you would think it would have a diode or something to prevent backflow.

But I also have power lines right under my seat for my ham radio that are hooked directly to the battery and even has a startup relay to protect from surge.
Typically the only issue with using a 12v "lighter socket" is whether or not they stay on when the vehicle is off. Our Fords for example stay hot as long as the battery is above a certain state of charge, but my dad's subaru shuts off either immediately or after a short delay.
Feb 12, 2025 03:51 PM
35 Posts
Joined Aug 2015

This comment has been rated as unhelpful by Slickdeals users.

Feb 12, 2025 04:07 PM
306 Posts
Joined Feb 2019
FarmerPeterFeb 12, 2025 04:07 PM
306 Posts
Quote from techguy553 :
That's electrically impossible for solar to "use energy" lmao. It only produces.
Could the charger itself be drawing power?
Feb 12, 2025 04:37 PM
7,274 Posts
Joined Dec 2006
big mikeFeb 12, 2025 04:37 PM
7,274 Posts

Our community has rated this post as helpful. If you agree, why not thank big mike

Quote from techguy553 :
That's electrically impossible for solar to "use energy" lmao. It only produces.
For a properly designed and working one in a system, sure, but bare solar panels not making power are essentially a resistor, any time you put a resistor across a power source you will drain power. Good solar panels will have controllers or blocking diodes to prevent this from becoming a problem, but assuming a Chinese solar panel can't EVER discharge a battery is naive at best.
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Feb 12, 2025 04:54 PM
651 Posts
Joined Dec 2016
JoeBlo1979Feb 12, 2025 04:54 PM
651 Posts
Quote from big mike :
For a properly designed and working one in a system, sure, but bare solar panels not making power are essentially a resistor, any time you put a resistor across a power source you will drain power. Good solar panels will have controllers or blocking diodes to prevent this from becoming a problem, but assuming a Chinese solar panel can't EVER discharge a battery is naive at best.
I would assume that most/all of these have diodes in place to block the reverse flow, but maybe not.

From the description:

Upgraded Smart Charger Controller] The smart charger controller built into the solar panel has six protection functions: over-temperature protection, prevention of reverse discharge, short circuit prevention, prevention of reverse polarity and over-charging protection. Meanwhile the built-in blocking diode plays an important role in blocking reverse current flow.
Last edited by JoeBlo1979 February 12, 2025 at 09:06 AM.

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