This is a good MPPT charger. I can set my own battery options with the MT50 monitor. Other people working offline are noticing the same issue I had with my old chargers. Battery operation with sundial! I have a large battery and set the soak to 3 hours but would set it to more hours as my batteries can soak or charge for 12 hours. I set my trickle charge to 14.5 volts. I want my batteries to charge for as long as the panels can store electricity and I definitely don't want to run out of batteries before dark. I couldn't figure out what my previous chargers were doing in float mode, but they drained my batteries a bit during the day and then returned to charging mode when the predetermined low voltage level was reached in float mode. This usually happened around the time the sun was going down, so my batteries weren't fully charged and the surface charge wasn't full when I left at night. Check charger settings when offline and battery voltage at night. It took me a summer to figure out what was going on and I was pissed when I realized the sun was shining and I was running my house on batteries instead of panels! I love all my free solar energy during the day. Put my freezer on high and charge all my tools, phones, computers, work equipment, etc. Once my batteries are charged, all excess electricity is free! This Solar Epic has a 20 amp load output and will show battery charge and the load being fed by your panels. Love the Solar Epic and connect extra power and panels (no more than 130 volts) so the charger always gets maximum power. You can put more than 40 amps on it, but not exceed 130 volts. READ THE INSTRUCTIONS! TO UPDATE. The device works great! The tracking seems quick to respond to passing clouds etc, which some reviewers complained about being slow. Maybe I'll buy another device in the future.