Was easy to hook up and worked great for about 2 months. Wondered why my trailer outlets were not working. The controller was reading 16 .amps and had melted. My batteries had overheated.

Love these controllers, this is the 3rd one I have purchased, all 3 are still working like champs, 2 of them are several years old now.

This may be an excellent charge controller but it is ONLY a charge controller. When I bought it I didn't know enough to know the difference and found out to my disappointment later. It is not suitable for a solar electrical system as it does not have output to the LOAD. I expect it will charge batteries just fine, but to manage a solar electrical system one also needs control of battery OUTPUT to the system. If you are looking for a system controller this will not do it. $99 wasted. I think they might have indicated this information in the product description to take care of newbs like me.
Live and learn.....

I installed one of these controllers for use with one of the flexible 18 foot solar arrays. The array is nominally 12VDC. Unfortunately, when you put the solar array into the bright Arizona sunshine, the array output voltage goes to about 35 volts. The controller works fine while charging the battery, but once the battery is charged and the load is removed from the solar, the solar voltage goes above 30VDC and the filtering electrolytic capacitor inside the controller explodes. It's pretty messy, with dielectric residue all over inside the controller. Luckily the capacitor is available at Radio Shack for under 2 bucks, and is easy to replace if you have soldering skills.

The fix for the high no-load voltage on the solar was to tell my mom that she needs to watch the controller current. If it goes below 0.5 amps, she needs to cover up half the solar array. I found that covering up half the array drops the no-load voltage to about 18 volts, which works fine for protecting the controller.

I'm not going to knock any stars off the rating, as this is designed for 12 volt solar. Getting a no-load voltage on the solar input above 30V is probably well outside the rating of the controller.

This is another fine example making sure the components from different manufacturers are compatible with each other.

I recently installed one of these controllers in a different vehicle, with no issues. In this case, the solar panel no-load voltage didn't go above 25 volts, which is quite safe for this controller.

For what it is, this controller is a good deal for the money.

I'll say that this Charge controller is good for very small projects and it handles up to 24v panels surprisingly well but the problems start when you really start pouring current into this thing. Anything above 10amps and it starts to cook, and after a few days of this the plastic at the back starts to deform from the heat. The heat sink on the back is way too small to deal with high current. I have pushed this unit right to its very limits as specified in the manual and it doesn't last very long when there. It cuts out until it cools down. So if you have a single panel and plan to charge a single battery that's around 100 - 150AH go straight ahead it will work well for that but for any multi panel/multi battery charging look else where.