I'm kind of partial to the Eco-worthy 20 A MPPT
controller for $102, delivered. I've installed 2 of them and I'm very impressed with it's performance, features, display and especially price
It's been disassembled and reviewed on youtube, very favorable review. It's rated at 20 A with 300w of solar
input. Realistically, it will probably produce 18.5-19 A at 300 watts. With 240 watts, you should see about 14-15 A. It comes with gold plated contacts, fully user adjustable charging
setpoints (bulk and float voltages) and the entire circuit board is conformal coated, which is surprising for such an inexpensive controller. It displays solar
panel output in watts and volts, charging current
in amps and volts, and total cumulative KW. I've seen other brands for twice the price
without those features. At that price, you could carry a spare in case of a lighting
strike or failure. Eco-worthy.com.
A better known name brand is Blue Sky Solar Boost 2000e, I have one of those also. It only displays solar output in amps, charging amps and charging V. It's limited to solar panels
24v or lower. All adjustments are done with small variable resistors on the back, is not conformal coated or gold plated and costs $190 - $235, plus about $20 s&h.