Split Charge Systems - VSR Relays and DC Battery-to-Battery Chargers.

Volt Sensing Split-Charge Relays

VSR (voltage sensing relay) split-charge relays.

The VSR systems are especially useful if you're fitting a split charge system from scratch and / or your vehicle was registered after the mid to late 90's with a complicated engine management system we would definitely recommend using a voltage sensing split charge relay because they are easy to fit and require no connection, or interference to, the vehicle electrics. Simply wire the relay from your starter battery to your leisure battery. This also avoids any vehicle warranty issues.

Voltage sensing split charge relays and fitting kits are easy to fit as they only need wiring from the starter battery to the leisure battery/batteries. They are suitable for older and also modern vehicles with INTELLIGENT ALTERNATORS, CANBUS and MULTIPLEX wiring systems. With volt sensing/sensitive split chargers there's no need to cut wires or take feeds from other sources (i.e. the vehicle alternator). Beware of other systems on the market that may cause electrical malfunction or invalidate the warranty on modern vehicles.

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To read more about split charge relay systems and what system will best suit your needs see our Battery Split Charging FAQ's.

For the very latest vans with Smart Alternators and Regenerative Braking Systems on which VSR relays will not work efficiently see DC Battery Chargers.

Cargo voltage sensing 70A split charge relay

Cargo voltage sensing split charge relay 70A - 12 volt

Easy to fit, compact voltage sensing split charge relay

12 volt 70 amp.

Easy to fit - no alternator/trigger wire connection required. Max output 70 amps. Allows charging of auxiliary/leisure battery bank without discharging starter battery. The voltage sensitive relay will make sure the starter battery is fully charged first before switching the charge to the leisure battery. Simple to fit. Cuts in at 13.4 volts and breaks at 12.8 volts.

See it on the H-C Cargo website.

Manufacturer:	HC Cargo
Model #:	160876
Max amps:	70 amp
Voltage:	12V
Dimensions:	60 x 34 x 70
Warranty:	1 year
Installation difficulty rating:	Easy
Instructions included:	Yes

Cargo Power-Tech voltage sensing 140A split charge relay

Cargo VSR 140A 12V

Cargo voltage sensing split charge relay 140A - 12 volt

12 volt 140 amp.

Easy to fit - no alternator/trigger wire connection required. Red LED indicator. Max output 140 amps. Allows charging of auxiliary/leisure battery bank without discharging starter battery. The voltage sensitive relay will make sure the starter battery is fully charged first before switching the charge to the leisure battery. Simple to fit. Cuts in at 13.7 volts and breaks at 12.8 volts.

See it on the H-C Cargo website.

Manufacturer:	HC Cargo
Model #:	161059
Max amps:	140 amp
Voltage:	12V
Dimensions:	68 x 54 x 68 (LxWxH)
Warranty:	1 year
Installation difficulty rating:	Easy
Instructions included:	Yes

Durite voltage sensing 140A split charge relay

Durite voltage sensitive split charge relay

Durite voltage sensitive relay

Durite voltage sensing split charge relay 140A - 12 volt

Voltage sensitive split charge relay 12 volt.

See it on the Durite website.

Manufacturer:	Durite
Model #:	072733
Max amps:	140 amp
Voltage:	12V
Dimensions:	68 x 54 x 68 (LxWxH)
Warranty:	1 year
Installation difficulty rating:	Easy
Instructions included:	Connections marked on back of relay

Durite voltage sensing 140A split charge relay - 24 volt

Durite VSR 24 volt

Durite voltage sensing split charge relay 140A - 24 volt

Voltage sensitive split charge relay 24 volt.

Easy to fit - no alternator/trigger wire connection required. Red LED indicator. Max output 140 amps. Allows charging of 24 volt auxiliary/leisure battery bank without discharging the 24 volt starter battery. The voltage sensitive relay will make sure the starter battery is fully charged first before switching the charge to the leisure battery. Simple to fit. Cuts in at 27.4 volts and breaks at 25.6 volts.