20A 12V 24V Auto IP68 Waterproof PWM Solar Charge Controller Solar Panel Battery Intelligent Regulator for Solar System Caravan Boat(24 Hours Working Mode)

Can't tell you about its water resistance capabilities because I'm using it inside a small enclosure I built for my two generators; one is a regular 10,000 watts generator and the other is 4,500 watts inverter generator. Both are electric start capable, so they both require battery power. The issue with the batteries is that they can lose power quickly or get damage by just sitting around, or if they are not allowed to return to a full charge state after being used. I'm using this HUINE 20A 12V 24V Auto IP68 Waterproof PWM Solar Charge Controller to keep both of the generator's batteries fully charged and ready just in case an emergency. The charge controller is connected to a 160W 12V solar panel and, so far, it has kept both batteries fully charged, without any evident of an overcharged condition. The LED lights provide indication of the battery power, solar panel power and/or an attached load. One thing that users must be aware of is that this charge controller does not have a provision to shut the power off to the load side. So, if you're not planning to attach a load to the controller, you should either tape the wires or use wire caps before connecting batteries. Anyway, based on my results and low price of this charge controller, I recommend it. It has worked flawlessly up to this point.

Used to control solar panels at our off grid cabin. Works great.

I have 2-10 amp and 3-20 amp of these charge controllers these are the best charge controllers I have purchased in the last 10 years they are small compact and one hundred percent waterproof I love the way the electronics are sealed in a silicone based substance similar to what they sealed Auto parts electronics in the 1980s.They work exactly like what is advertised I have even checked this on my multimeter they work great and should last for many many years. I also like the fact that these charge controllers are waterproof can tolerate high temperatures and also low temperatures. Super easy to install these charge controllers no programming needed.

This looks like a fine unit, small and well made. However, it CANNOT be used when Lithium Ion, LiFEPO4, NiMH batteries. This is not explicitly called out in the description but is in the instructions you'll receive. Purchase knowing what you can and can't change.

I’ve Had a for a few weeks to use with a solar maintainer panel I use for an outdoor shower that I need to keep a battery charged for an rv water pump. I tried just using a solar maintainer with built in controller but ruined 2 batteries in a matter of days. Bought this and everything is working fine now. It has lights that light up to show connectivity. I like that I did not have to try to jam wires into a small hole to connect to controller like other controllers I’ve used. Easy quick set up. Done in about 10 minutes.

I bought this for my small 20W solar panel to charge my new deep cell boat battery. My old charge controller was dumping too much voltage (15+ volts) into my battery and I didn't want to fry it. Since this one is waterproof, I decided to solder and heat shrink all the connections to the panel and the battery, so it wasn't the easiest to install, but it works great after taking those extra measures for longevity. I tested the voltage outputs through a charge cycle one sunny day. Worked very well, and was within the battery manufacturer's voltage recommendation for bulk charging and float voltages. Just remember, as with all charge controllers, the battery connections must always be made first (and dis-connected last) before the solar panel connections, or it may not charge or cause damage.

This works well I have had it running a 12volt fueling station for several years now without issue.

Lasted for 2 years before giving up the ghost. Was used in the NorthEast, inside an unheated garage, up towards the rafters, not very extreme conditions. Will be looking at a different manufacturer for a replacement.