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Not sure the product designed for vehicle battery

Customer Rating:
I made few measurements of voltage on vehicle battery contacts - with and without solar panel, with and without working engine, during engine start also (that is most critical). And the result is simple - there is no difference with or without the solar panel.

In addition I made measurements on panel contacts when there is no DIRECT sun light - very low energy supported, most of cases near to zero. And I'm leaving in very sunny place.

This panel probably can be used as power supply over little lamp or radio or something else like diode lights, but not for vehicle battery. And this is exactly why I bought it. So for me it was pure waist of money.

Never Worked

Customer Rating:
I read the product description for the solar battery charger and "boat batteries" were listed. I assumed that since they listed boats that the product was waterproof... Oops on me. The product is not water proof! Well, for twenty bucks, what do you want... I was able to rig a waterproof cover for it out of an old, clear camelback hydration bladder. With that in hand, I went out assuming that it would work... Oops on me again. The led that is supposed to light to tell you that it's charging never lit up. I thought that maybe the clear pack was somehow interfering with it. So, I took it out and no go...

THE PRODUCT DOES NOT WORK! If you need energy, just light a $20 bill. It's about the same cost and you'll get more energy from the fire than from this unit!!!

Unfortunately, I threw away the packaging, so I couldn't return it.

failure

Customer Rating:
Doesn't work at all. I've tried in repeatedly on my fully RV charged battery, and it doesn't keep it from running down at all. If I still had the packaging I would surely return it for a refund. I hope my experience isn't typical, but it's all that really matters when I've paid for something that's such a complete and total failure!

the best

Customer Rating:
works as advertised, keeps a charged battery full up, does not charge a dead battery, but the instructions state that, and no 1.5watt trickle charger will either, charges battery with indoor garage lighting, if this does not work for you its because you cannot read the instructions,

So far So good

Customer Rating:
It does what it says and seems to work well, I will need more time with it to see if it really keeps the car's battery charged.