The Mastervolt Charge Mate is a relay based switch that combined 2 batteries during charging, but isolates them when they are discharging, enabling the second battery to be charged regularly.

General specifications

Battery voltage: 12/24 V

Max. current: 500 A

Number of modes: on, off, auto, start assist

Dimensions, hxwxd: 90 x 80 x 85 mm (3.5 x 3.1 x 3.3 inch)

Weight: 0.65 kg (1.4 lb)

Compliance: CE

Technical specifications

Power consumption: switch open: < 1 mA at 12/24 V DC

Inrush current (250 ms): 2000 A

Switch on voltage: 13-15 V (12 V) / 26-30 V (24 V)

Switch on delay : 30 sec

Switch off voltage: < 12.25 V... > 15 (12 V) / < 25.5... > 30 V (24 V)

Switch off delay: 3 minutes

Relay: electro-mechanical

Temperature range (ambient temp.): -40 °C to 60 °C (-40 °F to 140 °F)

Protection degree: IP21