Review on Renogy 12V 20A AC-to-DC Portable Battery Charger with Alligator Clips for Lithium-iron Phosphate Batteries: Efficient Charging Solution by Jeremy Tyson

Pretty good value for money. The device does not require a fan. 300 watts pulled from the wall. The specs say it's 92% efficient. Which would make it the advertised 20 amps. This is the only listed (etl) device I've found in this price range. The light is red when charging and green when finished. This thing puts out a lot of power, it's probably a little more than an old xbox360 power supply if you remember. these things.