Renogy 10W 12V Portable Solar Panel Battery Maintainer Trickle Charger $29.99

um lol

"This item will be released on July 22, 2021."

kanechart wrote: ↑ um lol

"This item will be released on July 22, 2021."

Just in time for the height of summer...

I guess?

I might be wrong but isn't 10W kind of weak? Might be better to go for 21W or more.

You don't need 10W to maintain a car battery, but as long as it has the circuitry not to overcharge, go for it.

Quentin5 wrote: ↑ You don't need 10W to maintain a car battery, but as long as it has the circuitry not to overcharge, go for it.

Yep. The bigger concern is if this actually puts out 10W!

craftsman wrote: ↑ Yep. The bigger concern is if this actually puts out 10W!

That is easily measured.

If you have full solar load this won't be enough to put any sort of dent in maintaining your batt

Quentin5 wrote: ↑ That is easily measured.

Quentin5 wrote: ↑ You don't need 10W to maintain a car battery, but as long as it has the circuitry not to overcharge, go for it.

10W under maximum sunlight, much much less when it's overcast. On average? Who knows, probably enough. But yes, you want it to sense battery voltage and switch on/off.

mlieber201 wrote: ↑ If you have full solar load this won't be enough to put any sort of dent in maintaining your batt

It will actually be enough as long as the vehicle doesn't draw too much with extra 3rd party add-ons.

Mailliw wrote: ↑ 10W under maximum sunlight, much much less when it's overcast. On average? Who knows, probably enough. But yes, you want it to sense battery voltage and switch on/off.

Most car batteries fall into the 50-75Ah, At 12V nominal that is 600-900Wh (new). If they are being drained faster than this thing can charge it that means if you don't drive for a few days your battery would be dead or close to it. If that is the case then you have parasitic drain that is far outside the vehicle's spec.
Frankly if your car's battery dies this quickly or close to it then you have bigger problems than if this actually puts out 10W. You need to find the problem and solve it because its shortening your battery's life drastically and a band aid is a poor solution.

agreed. But i've even seen chargers that have a parasitic load when they aren't plugged in LOL .... so u got this thing thats 10W in perfect conditions and then the fact that on the average passenger car it still wont do much in a practical scenario

That time this solar battery charger proved to be the most reliable.

Although Amazon initially said I wouldn't get it until the spring, mine arrived a week ago. I connected it directly to the battery and fixed it to the rear side window with the supplied suction cups. The suction cups aren't the greatest so I'm not sure if it will stay in place while driving/cornering. I have some velcro with very strong adhesive I can use if it falls off.

I used some hot water to soften the suction cups so they would "stick" better, some of the vapour froze which you can see in the picture but hopefully you can get an idea of the size of the panel.

In my wife's case the battery is under the floor in the rear of the car so I was easily able to install the panel on the driver's side rear where it won't cause any problems. It would be super easy to extend the cable with an SAE-connectorized cable you can buy at any number of stores.

They included a 12 V cigarette lighter adapter but I don't think that would work in any car I have because the battery is disconnected from the port when the engine is off.

Overall, I'd buy it again.

From my experience, 10W panel in good position will effectively maintain your RV, ATV, Riding mower's batt in off seasons.