The Mastervolt Alpha Pro III Charge Regulator is a powerful and advanced 3-step regulator that transforms any alternator into a full temperature controlled charger.

The Alpha Pro III Solar Regulator protects against overcharging and extends battery life, while also balancing engine load and improving performance. Compatible with various alternators and suitable for all battery types, including Lithium Ion.


  • Fast and safe charging
  • Protects against overcharging and extends battery life
  • Compatible with standard and high performance alternators
  • Engine load balancing
  • 'Keep alive' feature for reliable tachometer readings


Charge characteristic IUoUo, automatic/3-step+
Charge voltage Bulk/Absorption/Float
Absorption time 4 hours (adjustable)
Temperature compensation -30 mV/°C, -17 mV/°F
DC voltage compensation up to 3 V
Field current up to 20 amps
MasterBus compatible yes
Dimensions 90 x 109 x 30 mm
Weight 0.4 kg
SKU MV45513000
Barcode # 45513000
Brand Mastervolt
Shipping Weight 0.4000kg

Manufacturer's warranty included

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