When smart alternators increase and decrease the voltage it causes a Voltage sensitive relay (inside the Redarc DC Charger) to fluctuate which causes the DC charger not to charge correctly. If your vehicle has a smart alternator you will need to have a compatible DC-DC Charger like the Redarc BCDC1225D. This charger is a MPPT Solar Regulator (9V to 32V), isolator and 25 Amp DC-DC Charger in one unit. An example of this is a Redarc BCDC1225D charger. I gnition relay (isolating switch) which allows current to flow when the ignition is turned on with the key and prevents the flow when the ignition is turned off with the key.ĭC-DC charger which has a built in isolator. Thus the house battery can drain and not drain the start battery. When the vehicle is turned off, the alternator does not produce voltage and the relay disconnects the current flow between the start battery and the house battery.
When the vehicle is running the alternator provides enough voltage to trigger the relay, which connects the start battery and house battery together. When the voltage on the input (start) is low enough the current is prevented flowing between the start battery and the house battery. When the voltage on the start side is high enough it will allow current to flow between the start battery and house battery.
This device turns the isolating switch on and off when it detects a voltage on the input side (start). Voltage sensitive relay (isolating switch). If the house battery drains it will not drain the start battery. When the switch is turned off it prevents the current flowing between the start battery and house battery. The switch allows current to flow between the start battery and the house battery.
There are many options for dual battery systems:
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