Victron Energy Bluesolar PWM DUO 20A Dual Solar Charge Controller LCD&USB 12V24V
(Victron Energy. BlueSolar PWM-LCD & USB. BlueSolar PWM-DUO LCD-USB 12/24-20. Solar Panels & Kits. Energy Monitoring. Water Saving. 1) For 12V use 36 cell solar panels, For 24V use 72 cell solar panel or 2x 36 cell in series.