Battery-Cables-&-Accessories > Battery-Isolators

Mastervolt Charge Mate Pro - 40 Amp

A secondary battery on board requires a dedicated charging solution. The Mastervolt Charge Mate Pro connects both batteries during charging and keeps them isolated when discharging. This makes it possible to distribute the charger or alternator current effectively between two battery banks. The Charge Mate Pro offers an additional advantage over mechanical charge relays, by limiting the charge current to the second battery. The primary battery, like a starter battery, is therefore charged with priority. The return current is automatically blocked even when the secondary battery has a higher voltage. An emergency start function is possible by connecting an optional bypass switch. The Charge Mate Pro series consist of a 40 Amp and a 90 Amp version, both suitable for charger or alternator applications.


  • Electronic charge coupling with very low voltage drop.
  • High system reliability by prioritized charging of the main battery.
  • Prevents power dips of the onboard electrical network.
  • Suitable for all kinds of chargers and alternators.
  • IP65 electronics in a corrosion resistant casing with aluminum heat sinks.
  • Fast and easy installation.
Item Description Price Qty in
Package
In Stock Add to Cart
904002 Mastervolt 83304002, Charge Mate Pro 40 (1 MIN) 249.70 1 EA

Mastervolt Charge Mate Pro - 90 Amp

A secondary battery on board requires a dedicated charging solution. The Mastervolt Charge Mate Pro connects both batteries during charging and keeps them isolated when discharging. This makes it possible to distribute the charger or alternator current effectively between two battery banks. The Charge Mate Pro offers an additional advantage over mechanical charge relays, by limiting the charge current to the second battery. The primary battery, like a starter battery, is therefore charged with priority. The return current is automatically blocked even when the secondary battery has a higher voltage. An emergency start function is possible by connecting an optional bypass switch. The Charge Mate Pro series consist of a 40 Amp and a 90 Amp version, both suitable for charger or alternator applications.


  • Electronic charge coupling with very low voltage drop.
  • High system reliability by prioritized charging of the main battery.
  • Prevents power dips of the onboard electrical network.
  • Suitable for all kinds of chargers and alternators.
  • IP65 electronics in a corrosion resistant casing with aluminum heat sinks.
  • Fast and easy installation.
Item Description Price Qty in
Package
In Stock Add to Cart
909002 Mastervolt 83309002, Charge Mate Pro 90 (1 MIN) 266.92 1 EA
Prop65 Warning