Model: powmr 20a rbl series solar charge controller
controller type: pwm (pulse width modulation) (note: some versions of the rbl series are advertised as mppt+pwm)
system voltage: 12v/24v auto-sensing
rated current: 20 amps (charge and discharge)
max solar input voltage: typically <50v or <60v (pwm version); some "keeper" mppt versions can handle up to 75v
max solar panel power:
12v system: 240w to 260w
24v system: 480w to 520w
battery compatibility: lead-acid (sealed, gel, flooded/open, agm); some specific models (rbl-li) also support lithium (li-ion, lifepo4)
outputs: dual 5v usb ports, 2a or 2.5a max
display: backlit lcd screen
protection features: short-circuit, open-circuit, reverse polarity, overload, reverse current, and over-discharge protection
operating temperature: -35°c to +60°c