SUNER POWER 10W 12V Solar Battery Charger Maintainer, Built-in Smart MPPT Charge Controller, Adjustable Mount Bracket, Waterproof 10 Watt Solar Panel Kits for Car Automotive Boat Marine RV Trailer

Easy to use, works well.

I have purchased this Sunerpower solar powered trickle charger to charge my boat battery off-season without removing the battery and putting it on a battery tender in the garage as I used to. I had been using the Deltran 15w Battery Tender solar trickle charger ($140) until a tree branch fell down and shattered its glass. This unit looked appealing due to the more traditional solar panel mount, which as you can see in my picture is on a tree next to the boat. I like that I can bend the bracket to fit the tree and angle the charger up to the sun.Upon installation, as many other reviewers have commented, the charge light was solid red indicating reversed polarity to the wires. My boat battery is connected with standard SAE connectors and extension cables (red+, black-) and I never had an issue with the Deltran. According to my volt meter, those wires read -12.86V, so it's actually the SAE extension cable reversing the polarity not the Sunerpower unit itself. To fix this there are three options: reverse the leads at the battery so that the red+ is on the negative battery terminal and vise versa; purchase a SAE reverse polarity adapter off Amazon ($6 for two); or use the included cables that come with the Sunerpower unit. As I didn't want the hassle of undoing my winterized boat cover to get to the battery and considering I prefer to use the extension cables exactly as they are, I chose the cheap Amazon adapter (see picture of tree) which arrived in 1 day. Immediately the charger was fast blinking red indicating active charge, and within a day with decent sunlight, the charger turned green indicating a full charge to the boat battery (see picture). What more could I ask for?So buyer do note that this unit is quite simple and nice and hopefully sufficient to charge and maintain a single deep cell battery, and I like the ability to view the charge status underneath which I couldn't do with the Deltran unit. But unless you use the supplied cables, you will most likely need to reverse the polarity on the wires which is a very simple fix. PURCHASE THIS UNIT WITH A SAE REVERSE POLARITY ADAPTER. Happy charging.

I have only had the unit installed for 36 hours. It seems to be working. The installation was easy, but the attachment screw to the PV bracket seems flimsy. The unit is currently quite shaded, but the battery registers 0.1 volt higher than yesterday

The product delivery was quick and it was packaged well and arrived without damage. The instructions are easy to follow and illustrated well. There is information on testing the unit on the back page which is important so be sure to keep the instructions somewhere safe if you ever have to do any troubleshooting.The solar panel is quite solid and the brackets are well made. Installation went without a hitch and the SAE cable connectors are very nice to work with. I made one slight modification on Step 6 where a set screw is tightened (otherwise the unit may fall) where I put a drop of Lock-Tite on the threads just to be sure that any mounting vibration would not result in the loss of the unit.The indicator lights are nice and again keep the instructions so you know what different flash or illumination patterns mean. It was a cool, overcast day when I installed this unit and it still showed that it was charging the battery.Have not had it long enough to evaluate its ability to charge a system over an extended period of cloudiness but I am hopeful it will work out fine.Would buy another one if the need arose.

There's a lot of bang for the buck with this unit. To power my telescope I use (2) six volt sealed lead acid batteries used in series for 12 V to power a simple cooling fan and a small computer (DSC) used to find astronomical objects. After a night of viewing, a small (12 V, 10 Watts) solar charger is the perfect way for me to recharge the batteries while I sleep during the day. This little unit comes with a built in charge controller (you buy this extra on a lot of solar panels) This maximizes the charging cycle and prevents nasty things from happing. For example short circuits, overcharge protection (turns off when battery fully charged), parasitic back charge (power back to the panel when not illuminated) and will not charge an inadequate battery. I had a personal issue with my battery being bad and the unit not working. I reached their technical service department by email and John was great at helping me resolve the issue. Tested the unit with new batteries and it worked perfectly. The instruction sheet was missing the information that would have been useful for identifying how the unit would act trying to charge a bad battery. Things do get lost in translation sometimes. Bottom line, Excellent unit, Excellent customer service!

The stand that holds this 10 watt solar panel is nothing short of excellent. It was a little tricky to set up in part because the directions are a bit confusing. They mention what the parts are but they don't quite explain which part goes where in an easy to understand manner. This may seem silly to them but this is not my first rodeo when it comes to setting up solar panels.The best part of this is how easy it is to arrange and secure the direction the panel needs to be facing. This is not easy with some fixed bracket systems. This gets around all of that. I set this up on the railing to my porch facing due south at an approximate 30° angle. The battery is being charged beautifully.If they ever come up with a 25 watt solar panel with the same bracket I would easily buy two to three more. To me the support bracket is the major selling point. The ball joint that they've included is not cheap by any means and holds everything perfectly still. It comes with an allen wrench that allows the user to fix it in place exactly where you think you'll get the most sunlight. I still may buy another one but I just wish the panel was at around 25 watts.

hooked this up to my deep cycle battery, the battery sat for the Winter, it charged to full capacity in about 1.5 days in poor sunlight.