20A 12V/24V MPPT Solar Charge Controller, Bateria Power Intelligent Solar Panel Regulator 20 Amp with LCD Display and LED Indicate Light Designed for 12/24 Volt Gel AGM Lithium LiFePO4 (Sunrock 20)

This really works good for charging LIFEPO4 batteries up to 20 amp hours. What a difference it makes compared to the cheap PWM controllers supplied with some portable solar panels. With 160 amp panels I can charge a 20AH LIFEPO4 battery from BCM shutoff to full charge in 2.5 hours in mid day sun. I like the small package that it is housed in. Easily packed into the same space as a cheap PWM controller. 160 watt solar panels easily put out 8.5 amps continuously with this controller. It appears very well built to last. Just watch your polarity with the SAE connectors. I just wish they put power poles on these things instead of the SAE connectors as the SAE connectors get loose all the time and heat up. You can’t go wrong by this purchase the unit works great.

Seems to work fine. I have a portable 200 watt solar panel I use to charge my camper battery. When I hook 2 up it doesn't work but I figured that since it's rated at 300 watts and 30 volts at 12 volts. But all in all it works fine.

I ordered the 20amp controller with Bluetooth connection because it is the only plug and play MPPT controller with Bluetooth connection that I could find. It also leaves me some room to add a 40-60watt panel in the future. The Bluetooth does not collect data if the app is not open and running or if you are outside of the connection range. So while testing on a July summer day with clear sky and 97degree temps I would lose connection anytime I came inside my house or if I left the app. So if you are buying this because you expect it to collect data over a full day then think again because it does not work that way.The app will be helpful for me when camping with my set up so that I can be in the shade and check on my charge system remotely.I like that it is plug and play ready with SAE connections and extra leads and SAE connectors in the box! I hooked up an Ecoflo 160watt panel, no electrical load, rated at the industry standard 70% efficiency with 19v and 9amps max. I saw a consistent 6.7amps and I will be testing again while under electrical load to see if that makes a difference. Instructions were straight forward and great. The physical operations were intuitive and easy to use without needing the owners manual.I will need to find a way to elevate this off the ground while keeping it away from direct contact with the solar panel to avoid overheating the controller. The controller does get extremely hot and the SEA connectors are hard wired backwards but that is not that big of a deal. Now if I suspected voltage drop I would need to measure the at the power source and then again at the battery terminals

Since I already had a 20 amp MPPT controller on another battery bank I was able to test this against that unit. I tried numerous variations with my panels but in each case this unit was about 50% as good at harvesting the available power the panels were putting out. I really wanted this to be a winner due to its size and how I could integrated it with my homemade backup box, but at least in my case it was not going to work as advertised. If you buy it, test the unit and see if in fact it is performing. It is possible I just received a faulty unit.

I’ve a small 4WCamper with a fixed 85w rooftop solar and backcountry a lot. I purchased a 200w portable so I could seek shade with the camper and put the portable in sun. I also started inverting AC power to charge my eBike. The 85w would get me back to 100%SOC but only with perfect full sun conditions. My existing controller wouldn’t handle the new 200w panel and also had dissimilar sizes too. So,.. wired an SAE exterior plug directly to the battery and use this controller in-line with the 200w portable panel. Because this charger and panel are independent from my camper, they can also be used to charge my boat (24v) and boat/truck (12v) starter batteries. I can also use the exterior SAE plug to inflate tires, or to inflate pontoon boats. It gives me much more flexibility than just being able to seek shade and recharge my eBike as I had originally set out to do. I suspect the reviewer who states inefficiently is placing the controller close to the panel instead of the battery and experiencing line drop? I have not experienced his concern and I’m in Montana too. Maybe his trial was on a smoke hazy day? My experienced efficiency is excellent.

Item came as described

This is a good charge controller. The problem I ran into is that when I connected more that 100 watts (abt 6 amps) of solar panel, the factory ASE connector points would get very hot due to resistance. With a 20 AMP charge controller I should be able to connect about 300 watts of solar panel, but NOT while using SAE connectors. That much amperage just cannot flow through them due to resistance. I replaced the SAE connectors with MC4 connectors at the input and an anderson connector at the output. Now it works great, no resistance etc. I'd have given 5 stars if I had not had to do this modification to make the charge controller safe and effective..

This thing works great I have no qualms with it it charges everything from my 100ah battery all the way down to my 6ah battery I have 225 Watts running to it at 12v