![]() ![]() Now on the BMS remote monitor, the DC Input Trigger needs to be changed to trigger via Ignition.ġ. Wire spliced connection through to the caravan 50A Anderson Plug’s positive using 6B&S wire. Splice wiring connection between PIN 4 and PIN 6 (refer to illustration above).Ģ. The BMS1230S2 mounted in the caravan will need to be wired to connect with the SBI12 now mounted in the vehicleġ. Using 6B&S, wire through to an Anderson plug at the rear of the vehicle. Wire the SBI12’s BLUE Override wire to the vehicle IGNITION.Ĥ. Source power from the vehicle start battery via a suitable MIDI Fuse to the SBI12.ģ. Install SBI12 in the vehicle according to the SBI12 Instruction Manual.Ģ. Vehicles with Variable Voltage Alternators will need additional wiring on both the Caravan and the towing vehicle to beįor vehicles with Variable Voltage Alternators towing caravans, a REDARC SBI12 Smart Battery Isolator and a 50A Anderson plug will need to be wired up for compatability with the BMS1230S2.ġ. Main Battery - Auxillary Battery and Earth.Want to know how to wire a REDARC Manager30 from a caravan to a vehicle with variable voltage alternator? The ‘VSR’ is very popular due to its simple installation, it is a 3 wire isolator. Note: Diode Isolators are not recommended as they have a substantial voltage drop and batteries do not fully charge. c) Smart Isolator also known as a VSR (Voltage Sensing Relay) or Electronic Isolator. If the main battery is too weak to start with a quick override, it is then recommended to use booster cables designed for the purpose.ġ) Battery isolation – Used to link or disconnect batteries.Ģ) Battery protection – Used to protect the main starting battery from discharge caused by accessories running off the auxillary battery.īattery isolation can be done with 3 types of isolators. The damage is not visible to the owner as it occurs inside the ‘VSR’ on the contacts of the relays, this shows as pitting and arcing and causes voltage drop or even total loss of power through ‘VSR’. This function if available should be used with extreme caution as the high current required to start an engine can damage all of the above types of ‘VSR’s. This typically happens at approx 12.5V.Ĭ) All ‘VSR’s have relays, these will be solenoid type, standard relay or solid state.ĭ) Some ‘VSR’s will have an override function or forced parallel for emergency charging or possibly even to start the car on the auxillary battery if the main battery has failed. ![]() Once the engine is turned off or the main battery drops below the low sense voltage the ‘VSR’ will disconnect the circuit. The charge is regulated by the cars own regulator fitted to the alternator which is typically 13.6V to 13.8V when the engine is at full operating temperature. The battery with the lowest charge will accept more charge initially and once they are at a similar capacity they will charge together. At this point the two batteries are joined in parallel and charge as one battery. This is where the voltage sensing circuit will activate the relays and bring the auxillary battery into the charge circuit. When the engine is started and the main battery charges up, the voltage will increase to a point that the battery is close to fully charged. Some may be solid state meaning the relays are not mechanical but rather an electronic switch that has no moving parts but these normally require large heat sinks to dissipate the heat generated and as such are about twice the size of a ‘VSR’ with mechanical relays, as technology improves we hope to see these get smaller and more efficient with smaller heat sinks.Ī) Most if not all ‘VSR’s have spike protection that protect the vehicles electronics as the isolator connects or disconnects the charging circuit.ī) All ‘VSR’s have a voltage sensing circuit, this circuit senses the main battery voltage. ![]() Basically they are all a type of ‘VSR’ – Voltage Sensing Relay. This type of isolator has many names like ‘Electronic’, ‘Smart’, ‘Automatic’, ‘Intelligent’, ‘Micro Processor’ and ‘VSR’. Following up on last week’s newsletter covering the continuous duty solenoid we look at ‘Smart’ Isolators. ![]()
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