Can it charge a car battery directly?

Yes, with the included battery clips or through the car charger plug. At 30W it maintains a battery rather than recharging a flat one quickly.

Does it need a charge controller?

For short maintenance use, no. For leaving a battery connected for weeks, add a controller to avoid overcharging.

Will it charge a phone or laptop?

Not directly. It is set up for 12V batteries, so charging small devices needs a separate 12V adapter.

How much power does it really make?

Expect well under 30W in real conditions. The rating assumes direct, strong sunlight and ideal alignment.

What comes in the box?

The solar panel, a car charger plug, battery charging clips and four suction cups.

Unbranded

Knadgbft Portable 12V/30W Solar Panel Battery Charger Maintainer

Best price now

$13.59at WalmartChecked Nov 14

Prices are checked against each store and labelled with when.

Visit Walmart

Unbranded

Knadgbft Portable 12V/30W Solar Panel Battery Charger Maintainer

Best price now

$13.59at WalmartChecked Nov 14

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $13.59 at Walmart on Nov 14.

Our take on the Knadgbft Portable 12V/30W Solar Panel Battery Charger Maintainer

A 30W monocrystalline solar panel sold as a battery maintainer and charger, with a car charger plug, battery clips and four suction cups in the box. It is aimed at keeping a car, boat or tractor battery topped up and at trickle-charging 12V gear outdoors. Monocrystalline cells give it more output per area than the cheap amorphous panels it competes with, but at 30W it is a maintainer, not a fast charger. Buyers rate it around 3.8 out of 5, and the common gripes are output below the claimed figure in real sun and flimsy wiring and clips.

Best forKeeping a parked car, boat or tractor battery topped upTrickle-charging a 12V battery at a campsite or cabinOwners who want a foldable panel that stores flat

Pros

Monocrystalline cells, more efficient per area than amorphous panels
Folds flat and packs small for storage or travel
Includes car charger plug and battery clips for two ways to connect
Suction cups let you stick it to a windshield or window
Works as a maintainer for batteries that sit unused

Cons

30W is a trickle charge, not a fast charge
Real output falls well short of the rated figure in anything but direct sun
Wiring, clips and connectors feel cheap to some owners
No charge controller, so it is not suited to leaving a battery unattended long term
Unbranded, with little support if a part fails

Knadgbft Portable 12V/30W Solar Panel Battery Charger Maintainer prices at every store

WalmartNew
In stockSold by BaylineReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$13.59Free shippingChecked Nov 14
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What reviewers say

3.8 / 567 ratings

Ratings average 3.8 out of 5. Owners who use it as a battery maintainer are mostly satisfied, while those expecting near-rated output or sturdy hardware are disappointed.

What people mention

OutputCriticisedOwners say it delivers well under the rated 30W in real sunlight.
BuildCriticisedThe clips, wiring and connectors are described as flimsy.
Battery upkeepPraisedBuyers use it to keep stored car and boat batteries from going flat.
PortabilityPraisedIt folds flat and is easy to store or carry.
Cloudy daysMixedOutput drops sharply when the sun is weak.

About the Knadgbft Portable 12V/30W Solar Panel Battery Charger Maintainer

This portable solar panel is a 12V, 30W battery charger and maintainer. The panel uses monocrystalline silicon cells and is black.

It comes with a car charger, a battery charging clip and 4 suction cups.

Voltage: 12V
Power: 30W
Material: Monocrystalline silicon
Color: Black
In the box: 1 x solar panel, 1 x car charger, 1 x battery charging clip, 4 x suction cups

Specifications

finish: 30WSource
color: BlackSource

Questions and answers

Can it charge a car battery directly?: Yes, with the included battery clips or through the car charger plug. At 30W it maintains a battery rather than recharging a flat one quickly.
Does it need a charge controller?: For short maintenance use, no. For leaving a battery connected for weeks, add a controller to avoid overcharging.
Will it charge a phone or laptop?: Not directly. It is set up for 12V batteries, so charging small devices needs a separate 12V adapter.
How much power does it really make?: Expect well under 30W in real conditions. The rating assumes direct, strong sunlight and ideal alignment.
What comes in the box?: The solar panel, a car charger plug, battery charging clips and four suction cups.
Where is the Knadgbft Portable 12V/30W Solar Panel Battery Charger Maintainer cheapest?: At Walmart, for $13.59, as of our latest check.
What do buyers say about the Knadgbft Portable 12V/30W Solar Panel Battery Charger Maintainer?: Rated 3.8 out of 5 from 67 ratings.

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