The Classic is designed to regulate DC input from PV, and Approved Hydro and Wind turbines. Solar, wind and hydro MPPT modes. Sunrise and sunset program set up. The Classic 150, 200 and 250 are designed to work with 12, 24, 36, 48, 60 and 72 volt battery banks.
As a newbie I haven't had much experience with charge controller or solar in general yet I've decided to build a small off-grid cabin and learn quickly. I had already owned a few pieces of gear in a portable kit I built for camping use. I have added to/replaced all of that gear up to the 18$ charge controller. Each step yielded a massive difference in how quickly the battery bank was charged but none as much as the MSC Classic. MPPT technology is no joke and should be considered a necessary to any solar system you will be using in multiple day stretches. I will admit to only using it in it's most basic form but by design; my system will utilize many of the features it has.
Performance: 400 Watts of panels in 12v configuration with a 400ah battery bank - from 60% to 89-90% charge before took the entire 3.5 hour direct sunlight hours to replenish with the prior unit. I can replenish with the MSC C150 in less than an hour and reach more capacity in the battery bank.
Thanks for taking me to a level above hobby Midnight Solar.
probably the best solar controller for the price. extremely good support. continuous firmware updates. cloud based access to data. and it is mostly made in the USA.