AIMS Power 12V Lithium Battery Voltage Regulator For Alternators

Alternator Charging Protection | Solid-State | 200A

The AIMS Power 12V Battery Voltage Regulator is specifically engineered to safely charge lithium batteries from an alternator.

Using advanced solid-state technology, this regulator automatically disconnects a 12V DC power source when voltage moves outside the safe operating range, preventing overcharging and protecting lithium battery banks from damage.

It is most commonly used in heavy duty applications where high output alternators, paired with large battery banks and extended drive times can stress lithium batteries. This regulator will allow charge to larger battery (s). No time limits.

Designed for Lithium Batteries + Alternators

Standard alternators are not designed specifically for lithium battery charging. Without proper voltage control, they can overcharge lithium batteries, reduce lifespan, or trigger BMS shutdown. This regulator continuously monitors alternator output and automatically controls charging voltage to protect lithium batteries during operation. It consistently regulates charging whether the vehicle is running for 1 hour or 20 hours, maintaining stable voltage protection throughout short trips or extended drive cycles.

Ideal for:

• Work trucks
• Commercial food trucks
• Fleet vehicles
• Service vehicles
• RV lithium upgrades
• Overland builds
• Any system using a high-output alternator and lithium battery bank

How It Works

The regulator continuously monitors incoming DC voltage from the alternator or other 12V charging source. It protects from high voltage and current spikes from the charging source.

• Supplies power within 9.4 – 14.4V
• Disconnects output below 9.2V or above 14.6V disconnects battery from alternator or other power source
• Automatically resets when voltage stabilizes automatically reconnects battery and alternator or other power source
• Protects lithium and mixed battery chemistries
• Prevents overcharging from high-output alternators or other power source no time limits therefore, able to charge large battery banks
• Protects lithium batteries from high voltage and current spikes of charging source

Automatic Reset:
Once voltage returns to the safe 9.4–14.4V range, the regulator automatically resets after a 2-minute delay and resumes normal operation.

Built for Continuous Heavy-Duty Charging

This regulator is ideal for systems with:

• High-output alternators (up to 200A DC devices, we also have a 100 amp model available)
• Large lithium battery banks
• Long-duration drive shifts
• Continuous high-amperage charging

Whether charging during short service calls or all-day commercial operation, the regulator maintains stable protection without interruption.

Built-In Load Isolation Protection

In addition to voltage regulation, the unit also isolates loads when voltage falls outside safe parameters. This helps protect the vehicle’s starting battery and connected electronics from unstable charging conditions.

Simple Installation

Designed for 12V systems
Supports up to 200A alternator or DC device .
Dedicated main battery port (this is labeled alternator, do not connect directly to alternator)
Compact design
Simple 2-wire installation
Solid-state (no mechanical relay wear)
Installs easily in common 2-wire 12V applications including vehicles, wind, hydro, and other DC systems.

Why This Regulator Matters for Lithium Systems

Lithium batteries are a significant investment. Improper alternator charging is one of the leading causes of premature failure.

• Prevents lithium overcharging
• Protects against unsafe voltage conditions
• Supports continuous-duty charging
• Extends lithium battery lifespan
• Enables safe lithium upgrades in heavy-duty vehicles

NOTE:

•  Use the LFP12VXXXAREG when charging a lithium battery from the alternator and starter battery. There are 100A and 200A voltage regulators available. No time limits, just convenient consistent voltage regulation. 
• Use the BATISO300 when you want to keep your starting battery at 100% while discharging from auxiliary batteries when the vehicle is off or using external charging sources.
• Use both the LFP12VXXXAREG and BATISO300 when charging a lithium battery from the alternator and a starter battery and you need the starting battery to remain fully charged while discharging auxiliary batteries with the vehicle off. Ideal when using external charging sources such as grid or solar.