I have 2-275w monocrystalline solar panels connected to 2 deep cycle marine batteries in a 12v system. 4 months in my camper so far with no problems. There are no other power sources (shore power, generator) to charge the batteries. It's really a bit hard for me to understand what corresponds to some of the numbers. The performance on the right shows how much performance I'm getting directly from my panels. When the battery is charged the power stays at around 50w even in bright sunshine, 5w or 0w of course at night) but when I turn the device on (like my inverter) it jumps to any power. for the device. Good to know that the controller regulates the system well.