EEEKit 20A Solar Charge Controller, 12V/24V Solar Panel Battery Intelligent Regulator with Dual USB Port PWM Auto Parameter Timer Setting Adjustable LCD Display, Blue

I had intended to order another 30A unit, but ordered this one by mistake which is rated at 20A charge current. I'm happy I made that mistake since the 30A units I have are off in their voltage reading by +0.42 and +0.50 volts which is quite excessive when it comes to a charge controller, this results in undercharge. This one reads the voltage accurately to within 0.1V and as long as the float voltage is properly set to 13.7V there should be little risk of overcharge. One thing I don't like about any of them is the load controller which can act flaky. IMO it is better to use an external switch directly connected to the battery terminals for any loads. Overall, I am happy with the controller since it is inexpensive and does the job well. I am using this with a 100W panel and a set of 4 paralleled 12V LED screw in bulbs rated at 13W each. The bulbs are supposedly 100W incandescent equivalents, so this gives 400W like lighting to my shed. I am using an old car battery which is working well. I change my car batteries every 4 years even if they are still in working order so I always have an extra one around anyway.

The unit is inexpensive and easy to install. BUT open USB ports on front and screwed on backing are not waterproof. Also, I found it almost impossible to change discharge and re-connect voltages; I can get to the menu, and change the settings, but cannot get the the unit to 'save' settings. It seems to revert to defaults no matter what I do to exit the setting menu.

I bought several to make solar charger marine / outdoor battery boxes. Easy to set up and seem to work well. The instructions are in a bit of "chinglish", but not hard to decipher if you understand basic solar wiring.I left one at the lake in the boat in the elements for the whole season, running a cheap harbor freight solar battery maintainer as the solar source, and a couple of used AGM batteries I acquired, wired in parallel. It kept the boat ready to go and the batteries charged for the whole year. Pretty good for the price, but not super heavy duty. No problems running the small amperage charger, but if I was running a high amperage array, I would select something more robust probably.I used another to make a campsite LED lighting and cellphone charging box with a similar setup and my daughter took it for a summer of road trips and had no problems. If she can't break it, it should hold up for most basic uses!

I built a bathroom where a closet used to be but it doesn't have any windows. It's real dark when the light is turned off, and especially when one is taking a shower and there's a power outage. I have two 12 - volts 100 amps solar panels, so I bought this charger to charge a 18AH GM battery powering two 12-volts RV ceiling lights (one in the bathroom and one in a dark hallway leading to the garage). The lights stay on throughout the day and during the night, at least until the battery voltage drops to a set level. Now, we don't have to worry about being left in the dark when taking a shower and can walk safely to the garage during an outage. Inexpensive and it works.

Had hi hopes... Seemed to work after instill, but who really knows unless you're monitoring it every day (I was using on a solar powered gate opener).Anyway, equipment it was connected to SUDDENLY Stopped working. In investigating, found the solar panel functional, the battery and this device, which everything was wired to - D.E.A.D.I'm going to give a different model/manufacture a shot and see what happens... This one, couldn't hold up.

Over the past 3+ years I have used 3 of these. The first 2 were defective but #3 lasted about 3 years. Recently another brand failed within 1 month and I went back to get #4 of this brand. I have an engineer friend that has a couple of these and they work fine. The instructions are awful. In the settings ,there are 4 battery choices but it defaults to B1. What is B1? They don't tell you what parameters to select but other brands want B3 for wet cell batteries so I selected that. There should be recommended settings for all the various parameters. You can't really expect Mercedes performance out of a Yugo car when you only paid $10 so don't get your expectations too high.UPDATE 8/19/2023. This controller like others failed me after about 2 weeks. It would not adequately charge the battery. ALL these cheap controllers shut down if the voltage goes below @11 volts. They say it will recharge when voltage comes back up. That my friends is an oxymoron. You have to remove the battery and put it on a real battery charger to get it above 11v. My solar system powers an outdoor intercom and there is a tiny LED light on the intercom button that is always lit. I believed it was drawing minimal power that the system could handle. NOPE! Come to find out my 10watt solar panel was just barely putting in what the sleeping intercom light was using, so the battery was always hovering around the danger level.My sleeping intercom continued to draw power even though the controller charge circuit had shut down in default mode, therefore running the battery to zero after several days. I now realize what I should have purchased and later did, was a solar maintainer/charger, not "controller". With help from an engineer friend we determined you really need about an 80-100 watt panel to stay ahead of the voltage drop. My system was putting out 12v or more, yet it was only putting out a fractional amount of amperage. With a maintainer/charger, there is no default mode like above. Once the solar panel puts out more than 12v, the maintainer charges the battery and maintains it. NO SHUTDOWN IN DEFAULT MODE.My friend taught me to use simple voltage/amp/watt calculations to determine what size panel you will need. 100watt panel @12v=8.3 amps. 10watt panel at 12v= .83 amps. Remember, all those numbers quoted on the listings are MAXIMUM numbers, not what you will get on a day to day basis. It's best to overestimate what you need, then, you can select the proper charger/controller you need for your application.