SeaLITHIUM VRC-100 Advanced Alternator Controller



An alternator smart charge controller specifically designed to operate with unmodified externally-sensed alternators.

Out of stock

SKU: VRC-100 Categories: ,


This product has been superseded by the new VRC-200 Charge Reference Controller

The SeaLITHIUM VRC-100 controller was specifically designed to work with unmodified, stock alternators equipped with an external voltage sensing input to provide fully configurable 3-stage charge control with advanced capabilities. The controller is able to both reduce or increase the built-in regulation voltage of the alternator and implement a fast, efficient charge profile while reducing stress on the batteries.

There is no need to dismantle the alternator, remove its regulator or worry about regulator polarity issues. A wire from the controller simply connects to the voltage sensing terminal on back of the alternator.

Originally developed for charging lithium iron phosphate (LiFePO4, also sometimes referred to as LFP) batteries on boards marine vessels with externally-sensed alternators, the SeaLITHIUM VRC-100 controller is equally suitable for charging all types of 12V lead-acid batteries: flooded, SLA, AGM or gel.

With its unique current sensing capability, it is the smartest alternator controller on the market:

  • Active Current Limiting allows keeping the charge current within the alternator continuous output capability without overheating for reliability and long service life. It also means higher sustained output at low RPM than what is experienced with traditional controllers that blindly reduce the field current.
  • Smart Charge Termination makes use of the battery current information to determine when the charge is complete. This means an optimum absorption duration every time, without any overcharging when batteries are already full.

Battery temperature compensation is available for charging lead-acid cells optimally and, while normally unnecessary, alternator temperature sensing for overheating protection is also possible.

The controller is microprocessor-controlled and was engineered to provide industrial-grade robustness and ultra-low power consumption in standby mode.

For the owners of new Volvo Penta D-Series engines, it is a highly effective plug-and-play upgrade for improving the charging characteristics of the excellent stock 14V/115A Mitsubishi A003TR0093ZT alternator, as well as maintaining the alternator within its continuous output capability without running it at peak temperature for extended periods.

Feel free to get in touch with any questions. We are always happy to review the particulars of an installation before selling our products.

Download Product Manual

Download Installation Drawings

Additional information

Weight 0.5 kg
Dimensions 13.8 × 5.9 × 3.1 cm

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