Three models accommodate solar arrays with up to 250 VDC of operating voltage. Open circuit voltage (Voc) is based on operating voltage plus the battery voltage. The Classic250 model is good for 300 Voc on a 48V battery. The Classic150 is good for 175 Voc on a 24V battery bank.
They have MPPT modes for solar, wind or hydro with user adjustable power curves, and a learning mode for self optimization. No hub is required for stacking Classics to act as one large controller. They have two auxiliary outputs, a dry contact relay and a 12V output. Each unit includes snap-on covers and hole plugs for sealing openings in dusty or salt-air environments, but about 20% reduction in output will result when used in sealed mode.
The Classic has built-in Ethernet, USB and RS-232 ports for two-way communications. An internal IP address allows the Classic to be a mini web server when hooked up to broadband. It has 32 MB of memory for data storage. A wizard-driven setup covers battery bank size, string voltage, wind turbine selection, power and wire loss chart, PV breaker sizing and more.