Battery Tender 021-1163 5W Solar Maintainer : Perfect for the camper! Add disconnect switch

2017, so i’ve used it now around 4 months. I have a 1999 ford taurus and the battery is 2 years old. I guess i might drive my car once or twice a month, so i had to drag out the charger, charge the battery, so i could use the car, every time.Since, i hooked the battery tender up to the battery, my car starts, every time. It has started, even when the temperature has been in the single digits and teens, for 2 whole weeks. I am thankful and thrilled, that i purchased this product. It was really easy to hook up, too.

I have my pontoon in dry storage, so i trailer it to the lake. While in storage i attach the battery tender to my battery box minnkota trolling motor power center with a battery charger male adapter. Battery stays charged and i’m good to go anytime. Peace of mind from battery tender.

I added this to the propane cover of our camper to help maintain a charge in our battery. If you don’t leave it plugged in, it drains the battery and doesn’t stay charged for long. The brain of it isn’t functioning correctly so now i will have to get a hold of the manufacturer to get a replacement. When i will i will follow up again. 3-12-2019 updatei added a battery disconnect switch so my camper when parked can no longer drain the battery when parked. I have the battery tender hooked directly to the battery and it now seems to be keeping the battery charged.

I bought this to protect 4runner battery while i keep it parked in the yard. (i ride my motorcycles daily & will switch back to the 4runner if/when i need to) this helps to keep my new battery charged for the occasional home depot trip. (had to get a new battery after the old one died from no use) also got the battery 25′ extension which is helpful should i need to adjust where i put the solar panel. No more dead batteries, no need for a nearby outlet or electricity just the everyday sun of southern california.

I bought this because since i am transitioning to a work-from-home position and am a student taking online classes, so i rarely drive and my car battery kept dying. Decided to get the 15 watt even though it might be a little overkill. My husband thought i was full of bull-hockey purchasing this solar charger so i didn’t have to get my car jump-started all the time, but it works. I just put it on when i feel like it and my car starts right up the next time i need to drive somewhere. Doesn’t even require a super sunny day to work. Just an fyi if you’re considering the 15 watt- it’s huge. I almost freaked out when i saw how large the amazon box was. It is almost as wide as my windshield, but it’s pretty light weight, and it’s easy to clamp onto my battery terminals (kia forte). I place it on my dash just sitting flat, open my drivers side window and fish the cords through, then close the window gently on the cord, pop the hood and wind the cord under the hood, hook it to the battery terminals and close the hood. Takes maybe a minute to get it set up; much less hassle than organizing for someone to give me a jump.

I purchased this solar panel to keep the battery topped off in my 2013 jku. Most of the trips are short, under 1km, so the battery doesn’t get charged enough duing trips to offset the drain when starting the jeep. When wired directly to the battery using the provided alligator clips, it works well and charges the battery fine. But i don’t want to have to pop the hood after every trip to hook it up, so i installed a remote port into the driver’s side mirror connected to the battery. Using a meter, i can read the volts off the battery at the port, yet the battery tender 15w panel i installed on my roof won’t charge the battery through this port. If i disconnect the alligator leads off the battery and test the output of the panel, i get 0 volts. This tells me that the smart circuits stop the power output when not hooked to a battery. I have to assume this is the reason why it will not charge the jeep battery through a remote port wired with 16g wire. I think the controller is not sensing that a battery is connected to the other end of the wiring. Otherwise, i’d give it 5 stars.

Battery Tender 021-1163 5W Solar Maintainer with Built-in Super Smart Charging Controller

  • Make sure this fits
    by entering your model number.
  • 5W solar panel with built-in Battery Tender 3-step microcontroller for super-smart charging that ensures that your battery is not damaged by overcharging
  • Output: 12 VDC, 270 mAmp DC, 5W max for battery charging and maintenance
  • Worry free: Reverse polarity protection, waterproof, sparkproof, built in temperature compensation sensor, and CE approved
  • Great for: Outdoor use, trickle charging, off road motorcycle, all-terrain vehicles
  • Approximate dimensions: 14″W X 16″L X 1″H; Weight: 3 pounds
  • Built-in 3-step microcontroller for precise charging
  • Waterproof and sparkproof for outdoor installations
  • Easy, do-it-yourself installation
  • Built-in temperature compensation sensor
  • 12V nominal voltage 270 mAmps

Although it helps extend the time before the battery is drained, it’s not a set-and-forget solution. I’ve still got to run the vehicles periodically or the battery will get depleted.

So i’m evaluating the 15 watt unit. I have to disagree with some of the reviews that said it’s not well made, i mean it’s not made of steel but it seems well constructed to me. It’s also noteworthy it has a five year warranty, what more could you ask for?. I was a little surprised the cigarette lighter adapter was not included, that’s ‘extra. ‘ so far when i first plugged it in, the led was flashing rapidly and in a few minutes was lit solid yellow. Have not seen the green led yet, but it’s only been plugged in like 24 hours. I’m trying it on a very large battery that’s used to start the v8 engine in my caprice, i have the charger on the back deck, so we’ll see how that goes being inside the car. I also noticed the led only seems to light when there’s light out, it seems to go dormant when it’s dark. I thought the led might be powered all the time by the battery, but it doesn’t seem to work that way. Not an issue, just mentioning how it seems to work.

Perfect for topping off the 12v battery while it sits in the parked travel trailer. I connected this with sensitive test equipment while also measuring current draw of the trailer, and this peaks at 1. 0 amps on a sunny day, and you are aimed within 30 deg. (it’s rated 10w but i got a reliable 12+ watts under ideal conditions. ) clouds make a huge difference (this is typical). The shadow of my hand drops the output from 1. 68 amps, that is, about a third less output. Be careful to not have any shadows on it.

I love this unit and it works like a charm. I don’t know how excited i can get about a battery tender but when things work like they should it just makes life a little bit easier. As you know the unit comes with a solar panel, charge controller and a 5 foot cord. Here are my points:1) 5 feet isn’t a very long cord. If you need longer search amazon for a sae battery tender extension cord. I’ve seen them in various lengths with 25 and 12 feet coming to mind. I believe the 12 foot was around $9. 2) if you intend to measure voltage at the leads you must have a battery with at least 3 volts connected to the unit before it will supply a charge. I guess they do this as a safety measure but it probably also protects the battery tender from overloads.

Battery Tender 021-1163 5W Solar Maintainer with Built-in Super Smart Charging Controller :

Review Date
Reviewed Item
Battery Tender 021-1163 5W Solar Maintainer with Built-in Super Smart Charging Controller
3 of 5 stars, based on 705 reviews