Mastervolt Charge Mate 1202 battery disconnect relay

The Mastervolt Charge Mate (MPN 83301202) is an automatic battery relay that connects two battery banks when the voltage rises above a preset value (>13V@12V / >26V@24V) for at least 5 seconds, allowing these battery banks can be loaded at the same time. When the voltage drops (<12.75V@12V / <25.5V@24V), the battery banks are disconnected again.

With an optional remote switch, the Charge Mate can be used as a parallel connecting magnet for emergency starts.

Background on the use of battery relays

Secondary batteries are being used more and more. Since a second battery can prevent the main battery from being drained to the point where it won't start, it seems like a safe and reliable solution. But the second battery also has to be charged regularly. Mastervolt offers the solution for this: the Charge Mate connects both batteries with a relay during charging and keeps them separate at other times.

important technical characteristics

• for battery voltage 12V / 24V with a continuous output of 120A
• Switch-on voltage 13-15 V (12 V) / 26-30 V (24 V), switch-off voltage < 12.75 V (12 V) / < 25.5 V (24 V)
• Switch-on delay ensures stable function as it is insensitive to voltage peaks
• can be used as a connecting link for an emergency start via the secondary battery if the starter battery is deeply discharged
• very low self-consumption at no load: < 1 mA at 12/24 VW

Can be used as a remote control switch (optional)

A single pole ON-OFF-ON switch can be used to remotely control the Charge Mate. If the SWITCH contact is connected to the negative supply, the relay remains open. When the switch is in the central position, the Charge Mate is automatically in service. If the Charge Mate is connected to the positive supply during a short pulse (ON), it will remain closed for 30 seconds, allowing the engine to start in the event of an emergency start. With a continuous connection to the positive supply (AN), the two battery banks remain connected in parallel.

LED display

The green "STATUS" LED lights up when the Charge Mate has connected the two battery banks in parallel. See table "STATUS LED".