Review on Efficient 20A Solar Charge Controller with Adjustable LCD Display for 12V/24V Solar Panel Battery System, Intelligent Regulator featuring Dual USB Ports by Michael Thaxton

I did a little surgery on mine to fix an issue where one of the MOSFETs wasn't touching the back panel. I bent them forward a bit and put a piece of shrink tubing behind them to hold them against the plate. Some of the people reporting these errors are most likely due to the FETs not touching the metal backplate and overheating. People who complain about wiring harnesses don't open the clamps before trying to tighten them I guess. The clamps are closed, you need to turn the screws counterclockwise to open the clamp. Once open, turn clockwise to close. They pressed very hard against my small 16 gauge wires and didn't budge after being tightened. I filled the wires with solder. This works fine with lithium batteries as long as you keep an eye on the charging voltage. I have checked the cut off voltage for the lower limit and when will I power the accessory. I saw a review that incorrectly assumed that 11.5 volts was the highest cutoff voltage for charging the battery, which is incorrect, it's the highest voltage you can set to not power your output . It always powers the battery until it reaches float 14.4. The level at which the power supply is completely cut off is highly adjustable and is excellent for protecting the lithium battery from over-discharge. All shield voltages match my multimeter perfectly. I also measured the current draw of the controller alone and found it to be 9.6mA, just under the advertised 10mA. The bad news is the floating battery voltage. This is the only setting that doesn't change on your setting. I saw it in other reviews and didn't want to use it anyway. The floating voltage is 14.4 volts regardless of which battery it is installed on. On the other hand, it regulates it to exactly 14.4 volts. If you have a fairly long cable to the battery, it's easy to lose a few tenths. I saw a review of an older version of this controller and in the past it allowed a float setting, too bad it was removed probably to save money. The older model could be tuned to 12.7 so it could be used even for lithium without monitoring with a slight surge. The current one allows you to set the float to 13 volts but does nothing. For what I do with it, I don't care about the float voltage, it's for emergency power and car battery charging in the winter. Also for direct charging of 12V lithium batteries and NOCO GB70 jump starter. I'm connecting it to a 30 watt panel, so the max output for it is pretty low, 1.5 amps max. 1 start was disabled due to a heatsink issue, but overall I'm really impressed with it.