The Felicity 580W Monocrystalline Solar Panel (such as models like 72HTBD-580M or em580w) is a high-output, half-cut cell panel designed for large residential, commercial, and off-grid power setups. It operates at an open-circuit voltage of roughly 24V and a maximum power voltage of 24V, meaning it pairs with MPPT charge controllers or hybrid inverters rather than charging a 24V battery