Similarly to diode battery isolators, FET isolators allow simultaneous charging of two or more batteries from one alternator (or a single output battery charger), without connecting the batteries together. Discharging the accessory battery for example will not result in also discharging the starter battery.
In contrast with diode battery isolators, FET isolators have virtually no voltage loss. Voltage drop is less than 0,02 Volt at low current and averages 0,1 Volt at higher currents. When using ARGO FET Battery Isolators, there is no need to also increase the output voltage of the alternator. Care should taken however to keep cable lengths short and of sufficient cross section.
When a current of 100 A flows through a cable of 50 mm2 cross section (AWG 0) and 10 m length (30 ft), the voltage drop over the cable will be 0,26 Volt. Similarly a current of 50 A through a cable of 10 mm2 cross section (AWG 7) and 5 m length (15 ft) will result in a voltage drop of 0,35 Volt!
Alternator energize input
Some alternators need DC voltage on the B+ output to start charging. Obviously, DC will be present when the alternator is directly connected to a battery. Inserting a Diode or FET splitter will however prevent any return voltage/current from the batteries to the B+, and the alternator will not start. The new Argofet isolators have a special current limited energize input that will power the B+ when the engine run/stop switch is closed.
Argofet 100-2, Argofet 100-3, Argofet 200-2, Argofet 200-3
Off-grid, Backup and Island systems
Certificate Safety IEC 60335-1 – Argodiodes, Argofets and Diode Battery Combiners
Declaration of Conformity – Argo Battery Isolator and BCD Battery Combiner
Argofet 200-2 / 200-3
Argo Fet Battery Isolator with alternator energize input
1.2kVA 12V MultiPlus 230 Volt system example with Argo Fet and MPPT
3 Phase VE Bus BMS system 4 pin with 3xQuattro and 4x200Ah 24V Li
3 Phase VE Bus BMS system 5 pin with 3xQuattro and 4x200Ah 24V Li
VE.Bus BMS example with 3kW 12V MultiPlus 230V