ARGO FET Battery Isolator with alternator energize input is a product that has virtually no voltage loss compared to diode battery isolators. It has a voltage drop of less than 0.02 volts at low current and an average of 0.1 volts at higher currents. This means that there is no need to increase the output voltage of the alternator when using ARGO FET Battery Isolators. However, it is important to keep cable lengths short and of sufficient cross section. For example, a current of 100A through a cable with a cross section of 50mm² and a length of 10m will result in a voltage drop of 0.26 volts. Similarly, a current of 50A through a cable with a cross section of 10mm² and a length of 5m will result in a voltage drop of 0.35 volts!
The ARGO FET Battery Isolator is a field‑effect transistor based battery separator that virtually eliminates voltage loss when charging multiple battery sets from a single alternator. It automatically adapts to 12 V or 24 V systems and includes an optional energize input for alternator start‑up.
The guide details installation: disconnect negative battery cables, connect the alternator positive output to the isolator input, link each battery set to the designated outputs, optionally wire the energize terminal to the engine run/stop switch, and use a minimum cable cross‑section of 2.5 mm². A blue LED indicates input voltage.
| Voltage drop (low current) | < 0.02 V |
|---|---|
| Voltage drop (high current) | ~0.1 V |
| System voltage range | 12 V / 24 V (auto‑adjusting) |
| Minimum cable cross‑section | 2.5 mm² |
The isolator drops less than 0.02 V at low current and about 0.1 V on average at higher currents.
Yes, it automatically adjusts to either 12 V or 24 V system voltage.