Intact battery guard accubewaker 6,12 en 24 volt / Bluetooth control | bol.com
Battery Guard 40A 12/24V [ALM Part Reference - BGM40] - £49.95 : ALM Solutions, Auto Electrical Parts and Accessories for Cars, Boats, Caravans and Campers
Low Battery Alarm and Auto Disconnect for 12V or 24V Battery Banks