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Red_Liz | Staff 45.2K Views
Mar 24, 2026 5:49 PM

ECO-WORTHY 10W Solar Car Battery Charger Maintainer w/ OBD-II Cable

$24

$40

40% off
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Update: This popular deal is still available.

CO-WORTHY US via Amazon has ECO-WORTHY 10W Solar Car Battery Charger Maintainer w/ OBD-II Cable for $29.99 - $6 when you apply promo code OZ623KSG at checkout = $23.99. Shipping is free with Prime or on $35+ orders.
  • Note: You must be logged in to apply promo codes; promo codes are typically for one-time use and don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page.
Thanks to Staff Member Red_Liz for sharing this deal.

Includes:
  • 10W 12V solar battery charger panel
  • OBD-II charging cable (for direct vehicle connection)
  • Alligator clip cable (for direct battery connection)
  • Adjustable mounting bracket
  • 4 x PVC screw-on suction cups for window mounting
  • Integrated indicator light (built into panel)

Editor's Notes

Written by qwikwit | Staff
  • About this deal:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
  • About this store:

Original Post

Written by Red_Liz | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Update: This popular deal is still available.

CO-WORTHY US via Amazon has ECO-WORTHY 10W Solar Car Battery Charger Maintainer w/ OBD-II Cable for $29.99 - $6 when you apply promo code OZ623KSG at checkout = $23.99. Shipping is free with Prime or on $35+ orders.
  • Note: You must be logged in to apply promo codes; promo codes are typically for one-time use and don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page.
Thanks to Staff Member Red_Liz for sharing this deal.

Includes:
  • 10W 12V solar battery charger panel
  • OBD-II charging cable (for direct vehicle connection)
  • Alligator clip cable (for direct battery connection)
  • Adjustable mounting bracket
  • 4 x PVC screw-on suction cups for window mounting
  • Integrated indicator light (built into panel)

Editor's Notes

Written by qwikwit | Staff
  • About this deal:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
  • About this store:

Original Post

Written by Red_Liz | Staff

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Top Comments

azndudeC2
7Comments
10Reputation
The OBD connector on this is a little finicky. It only has one of the two possible ground pins and as a result didn't work on my 2000s Camry and Corolla
Go to Comment
Dud321
270Comments
366Reputation
When placing a solar panel behind a vehicle windshield, you can expect an average efficiency loss of 30% to 50% compared to placing it in direct outside sunlight. Under poor conditions, such as with tinted glass or suboptimal angles, this loss can soar to 70% or more.
Go to Comment
OJ47
185Comments
46Reputation
I got this about a month ago at $30 for a truck that isn't used too often. I use it with the solar panel inside the windshield on the dashboard, connected to the OBD2. It's been working well so far.
Go to Comment

Community Reviews

This 10W solar battery maintainer is aimed at keeping a parked vehicle topped off, especially for cars, trucks, mowers, and other equipment that sit for weeks at a time. The low price stands out, and the panel has been reported to hold batteries around 12.75 volts, clear low battery warnings, and restart vehicles after long idle periods. The OBD II setup is convenient for some vehicles, but the connector can be finicky, and several reports question whether the panel is enough in winter, behind tinted glass, or for dead batteries. It looks best suited to light maintenance in decent sun.

Common Questions (5)

  • For maintenance use, 10W can be enough because real-world parasitic draw on many vehicles is low and the panel's rated wattage is its maximum output. It may still be insufficient for some vehicles, especially in winter, under snow, or when the car's draw is higher than the panel can replace.

    nodashiplRyanMPLSJasonSternNothingworked

  • Yes, it can keep rarely driven vehicles topped off and prevent low-battery warnings when the car has parasitic draw or sits for weeks. Users report success on trucks, vans, mowers, and older cars, with batteries staying around 12.75V and cars starting right up after long sits.

    WillingbaconOJ47GorethresherCurtitout

  • It can work through the OBD-II port on vehicles that support it, and some setups use the battery-terminal clips or a wired-in battery connection instead. Several comments note the OBD-II route is finicky on some cars, so direct battery connections are the safer fallback.

    azndudeC2Robin00bmwe30nutXoblaim

  • It is a battery maintainer, not a dead-battery charger. It is meant to keep an already charged battery topped off and prevent drain, though some users report it can recover a battery if left on long enough.

    JasonR9389OJ47SiennaAlpaca1565sl001

  • It can work inside the windshield, but output drops compared with direct sun. One comment estimates a 30% to 50% efficiency loss behind glass, and tinted glass or poor angles can push losses to 70% or more.

    Dud321OJ47Zip.Zap

AI-generated summary based on comments from the community. Updated ago

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70 Comments

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Mar 27, 2026 2:46 PM
341 Comments
Joined Oct 2025
SiennaAlpaca1565Mar 27, 2026 2:46 PM
341 Comments
Quote from JasonR9389 View quoted comment :
I've got three of these on equipment and they keep the battery from draining, but it's NOT a charger, if you've got a dead battery this isn't what you need, which should be obvious.
I left an eight watt charger like this on a dead battery and forgot all about it and what do you think happened? It charged.....
Mar 27, 2026 3:13 PM
8 Comments
Joined Dec 2021
GorethresherMar 27, 2026 3:13 PM
8 Comments
I have one of these. I let my car sit for 4 weeks while I was away. When I came back it started right up with no issues.
Mar 27, 2026 4:23 PM
492 Comments
Joined Jan 2009
tooslickMar 27, 2026 4:23 PM
492 Comments
Quote from itsjoemoney View quoted comment :
Is it a newer truck? I'm reluctant to trickle charge through OBD on my 24 GMC that has so many electrical things going on. Even when I open the back door of the vehicle, I hear whirring and electrical sounds under the hood.
I don't recommend charging through OBD 2. Even at a trickle.
Mar 27, 2026 4:25 PM
234 Comments
Joined Apr 2011
Zip.ZapMar 27, 2026 4:25 PM
234 Comments
Quote from SiennaAlpaca1565 View quoted comment :
I left an eight watt charger like this on a dead battery and forgot all about it and what do you think happened? It charged.....
How long was it left on the battery?
Did you charge via the OBDII port or the direct clips?

If anyone's battery is dead, the fastest charge up is achieved with a charger that uses direct clips and outlet power.
1
Mar 27, 2026 5:25 PM
45 Comments
Joined Oct 2011
paedayMar 27, 2026 5:25 PM
45 Comments
Quote from jmm1122 View quoted comment :
Could you use this with a portable power station like Bluetti for very slow, gradual charging?
The unit uses typically 10-30 watts just when it's on with nothing plugged in to run, so this probably wouldn't charge it.
Mar 27, 2026 6:40 PM
1.3K Comments
Joined Jun 2018
JasonSternMar 27, 2026 6:40 PM
1.3K Comments
Quote from nodashipl View quoted comment :
im surprised a 10watt solar panel is enough.
It really depends on the use case. My "German engineering at its finest" cars consume about ~20W for security, remote entry, etc.
My old trusty Xterra consumes maybe 1W tops to blink an LED with the word "SECURITY" printed above it. Nobody is breaking into it without the LED blinking faster. That'll stop them.
Just remember that the panel wattage is rated at its maximum capacity - not its average output. And be it the car charger or OBD2 adapter, you need an active circuit back to the battery for this to do anything. A lot of negative solar charger (maintainer) reviews come from people not understanding that their vehicles have auto shut-offs on the cigarette lighters when the vehicle is off.
Mar 28, 2026 4:26 AM
472 Comments
Joined Jul 2017
NothingworkedMar 28, 2026 4:26 AM
472 Comments
I've got a parasitic draw on my old truck and this may be enough to overcome it. Or just install a battery shutoff and keep this solar thing plugged to it so the battery stays topped up.

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Mar 28, 2026 9:56 AM
720 Comments
Joined Apr 2014
GarrettM6420Mar 28, 2026 9:56 AM
720 Comments
A 10W solar panel phone charger isn't even enough for a phone. This surely is nothing more than E-Waste.
3
Mar 28, 2026 4:36 PM
12 Comments
Joined Mar 2014
jccamelcamelMar 28, 2026 4:36 PM
12 Comments
Would this be good for use on a riding mower over winter?
Mar 29, 2026 1:00 AM
9.1K Comments
Joined Nov 2006
infin8007Mar 29, 2026 1:00 AM
9.1K Comments
Quote from stevesaves View quoted comment :
I didn't know you could charge through OBD port. Is OBD a standard for any make or would this work on Porsche?
Yes obd is standard and should work for you
Mar 29, 2026 1:06 AM
9.1K Comments
Joined Nov 2006
infin8007Mar 29, 2026 1:06 AM
9.1K Comments
24 bucks in my business account. I'll pass.
Mar 29, 2026 1:45 AM
1.3K Comments
Joined Feb 2009
MunkynutssMar 29, 2026 1:45 AM
1.3K Comments
I've had this on my wife's beemer for 3 days, after topping the battery with a battery tender. Has yet to blink indicating "full". Wondering if I got a bad panel. My multimeter shows it's putting out 10.43w in full sun. Not sure what's going on here, about to just say f*ck it and return.
Mar 29, 2026 1:46 AM
1.3K Comments
Joined Feb 2009
MunkynutssMar 29, 2026 1:46 AM
1.3K Comments
Same problem with my 30-year old 4runner. 4 days on a full, new battery and no blinky-blinky.
Mar 29, 2026 6:30 AM
720 Comments
Joined Apr 2014
GarrettM6420Mar 29, 2026 6:30 AM
720 Comments
Quote from Munkynutss View quoted comment :
I've had this on my wife's beemer for 3 days, after topping the battery with a battery tender. Has yet to blink indicating "full". Wondering if I got a bad panel. My multimeter shows it's putting out 10.43w in full sun. Not sure what's going on here, about to just say f*ck it and return.
Please do any amount of research on like products. 10w is a laughable amount of electricity. This product is nothing more than e-waste. People have tested and deemed like systems to not even be enough to sustain a change on a modern day cell phone. Half of these comments about "this worked amazing" are shills/paid actors or people who haven't the slightest clue of the actual impact this would have but can't help but consume products.
2
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Mar 29, 2026 7:45 AM
1.3K Comments
Joined Feb 2009
MunkynutssMar 29, 2026 7:45 AM
1.3K Comments
Quote from GarrettM6420 View quoted comment :
Please do any amount of research on like products. 10w is a laughable amount of electricity. This product is nothing more than e-waste. People have tested and deemed like systems to not even be enough to sustain a change on a modern day cell phone. Half of these comments about "this worked amazing" are shills/paid actors or people who haven't the slightest clue of the actual impact this would have but can't help but consume products.
I couldn't give 2 shits about "impact", "e-waste", or any of that other garbage. Preach your gospel somewhere else.
3

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