Solar battery tenders:

[speeder]

Anyone tried one? Any recommendations on brands?

Here are a few on Amazon, no idea if they work and for how long:

https://www.amazon.com/s?k=solar+battery+chargers&hvadid=616863042948&hvdev=c&hvlocphy=9199071&hvnetw=g&hvqmt=e&hvrand=9298042467011007537&hvtargid=kwd-2737211381&hydadcr=24632_13611814&tag=googhydr-20&ref=pd_sl_30d4qfw267_e

[pwd72s]

Link doesn't wortk...but no, never tried one. Unless one draws current when it has no light, should work...but depending on panel size, not a lot of output.

[Rusty Heap]

Go shopping for RV parts on Amazon.

How many amps you want out of a panel?

My $89 Eco-Worthy 100 watt 2 foot x 4 foot panels are good for around 4 amps (60 watts) measured.

[Tobra]

Had a cheapo Harbor Freight one, panel sat on the dash, plugged into lighter or it had cables to attach to battery. Worked okay, used it on my wife's car that had a current draw I could not track down. Kept it from going flat, shudder to think how long it would take to charge a dead battery

[Evans, Marv]

I used one of the small panels (about 3"x10 or 12") a long time ago to keep one of my tractor batteries charged. I found out one drawback was the wire from the bottom of the panel would break near the bottom of the panel. Outside in the wind & breezes the wires fatigue from being blown back & forth. If you use one, take that into consideration.

[flatbutt]

I use one on the battery for my trolling motor on the jon boat. So far so good. I got it off of Amazon but don't recall the brand.

[juanbenae]

was one on my original generator and it worked well.

[speeder]

Thanks for responses. I was thinking of using one for a tender on my RV, which never goes anywhere but sits out in the sun all day. It has 3 expensive batteries.

[Rusty Heap]

4 panels on my RV can put out 15-16 amps.........heck of a trickle.

[craigster59]

I bought this one for my travel trailer. After spending $$$$ on batteries that went dead, even with a cutoff switch. Has worked flawlessly keeping the batteries charged. Wished I had done it sooner!

https://www.amazon.com/gp/product/B07TNFPFZ8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

[Deschodt]

I see at track days on old cars, so it must work... people wouldn't risk losing track time with junk

[speeder]

Originally Posted by craigster59

I bought this one for my travel trailer. After spending $$$$ on batteries that went dead, even with a cutoff switch. Has worked flawlessly keeping the batteries charged. Wished I had done it sooner!

https://www.amazon.com/gp/product/B07TNFPFZ8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

Just ordered two of them, thanks, buddy!

[Rusty Heap]

Originally Posted by speeder

Just ordered two of them, thanks, buddy!

shrug, only 9 watts, will barely light a bulb.

3/4 amp hour ain't going to do diddley. depends on your expectations I guess.

[speeder]

Originally Posted by Rusty Heap

shrug, only 9 watts, will barely light a bulb.

3/4 amp hour ain't going to do diddley. depends on your expectations I guess.

I want them simply as battery tenders for 12V auto batteries. Are you saying that they are too weak for that?

[craigster59]

Originally Posted by speeder

I want them simply as battery tenders for 12V auto batteries. Are you saying that they are too weak for that?

Trust me, you'll love them. That's what they are specifically designed for.