Topsolar Solar Panel Kit 20W 12V Monocrystalline with 10A Solar Charge Controller + Extension Cable with Battery Clips O-Ring Terminal for RV Marine Boat Off Grid System

So far its doing its job, keeping my car battery charge while not being used. I had another one that I installed on the roof of my garage this one i installed on the side of my house.

my vehicle sits for long periods of time - I don't go to the office hardly ever and when I do drive to the grocery store, its the 35miles per gallon commuter that I take instead of the 14 mpg weekend warrior truck. Unfortunately, this means that my battery dies after about 30 days due to accessories drawing power like remote starter, antitheft system, etc. I ordered a 10W solar charger that did NOT do the job and the battery still died while connected to it in sunny arizona. I returned that charger and ordered this one. Well, once again my battery didn't have enough power to start the engine, and instead of jumping to start it, I attached this solar charger and let it sit. After 24 hours the batter once again had enough power to start the engine. Im happy with the power this produces and if left attached, it keeps my batter charged enough for starting - although my neighbors hate me because now I move my car out of the community / guest parking even less since I don't need to start it as often to re-charge the battery via the alternator :-D

This setup is perfect for the beginners out there and I've really loved this kit for the price. It's super easy to connect everything! I even had this in my car for a little while mainly to start out with because I didn't have a suitable battery. I did finally buy a used lead acid battery that I am using but only temporarily.The panel itself appears to be well made and I have checked the voltage straight from the panel and I get 20 volts and you wouldn't want to connect this straight to your battery. And that is why you need a controller to lower the voltage and to apply either a steady current or a pulse charge which is just on off, on off etc.Haven't had any issues with the panel. It's definitely glass and can break so treat it gently. Haven't had any issues with water as of yet but I anticipate that it's waterproof.My only complaint is that when I set the float voltage to the battery on the included PWM controller, no matter what I set it at, in full sun the controller always charges the battery at 14 volts. And the same goes for when I set the output voltage, it will always be at the same voltage as what it's displaying on the screen and in full sun that's 14 volts.Most of the time if you are running something that is supposed to run from a 12 volt battery it's not a huge deal as most devices work fine at 14 volts because they are designed to, as when you're charging a 12v battery you want to charge it at least 13.8 volts which is typically what you see from your alternator in a vehicle. But if you're planning on running anything else just make sure you know what you are doing.As I mentioned, I am now using this on my house to charge batteries and I am planning on upgrading to Lithium batteries. I had to add some wire to the panel and I chose 16g for that and I'm not having issues.I'm using this for HAM radio so that I can always have a backup power source and this kit works great for this purpose! I would recommend this to anyone who just wants to keep their small lead acid batteries or lithium batteries charged.One thing to note is that the included PWM controller can only handle 10 amps. This means you can run a HAM radio but only one. Just do not exceed the amperage and you'll be fine. But I imagine that you could connect a inverter or something else as long as you connect it straight to your battery and bypass your controller. I don't see any reason why that wouldn't work. Just always be mindful of your voltage and amperage.

There would be long stints between me using my scooter as it was gifted to me when I really didn't need it. But I still loved going around on it every now and then. The limiting factor would be having the battery get a little weak from sitting so long and making it difficult to start. I bought this and 3D printed some brackets to hold it on to the back of my scooter and just wired to the battery. Always had a full charge and was ready to go whenever I was. I think this little kit makes a pretty good battery tender as long as you do the due diligence of keeping it dry.There are a lot of battery tender options out there but I didn't want something that required it to be hooked up to an AC outlet or to my house with the inherent danger of charging a battery and where I usually parked it did not have an outlet. This was the perfect solution. Although if doing something in a marine application you may want to go with a waterproof charge controller but that's up to you.

I bought this as an experiment just to learn how to set up a solar powered system and toy around with the controller. It was a nice learning experience, I learned a lot. I would say the value in that alone was worth the product. However now that I know what I'm doing I hooked this up to my new system and I'm only clocking 7 Watts off this thing in direct sunlight. 🤣 Just something I feel customers should know up front before buying it.