If Optimal Charging at Low Speed is Important to You, This is the Perfect Alternator for You

High Output / High Amperage Alternator: The Highest Power Output in Its Class

Note: If fast idle charging is important to you, view our ARCO Zeus 24V 7kW High Amperage Alternator here.

24V Advantage – Low Turn On (LTO)

The ARCO Zeus A4000-24V LTO alternator turns on at lower RPMs, runs cooler and provides more power than older designs that are larger and heavier. This alternator continuously generates over 1.4kW (51 Amps) at just under 1,500 RPM, and almost 2.4kW (87 Amps) at 2,000 Alternator RPM. Put in real world terms, a marine diesel engine idling at 750 RPM with a 2:1 pulley ratio is generating over 1.5kW (55 Amps), and a Mercedes Sprinter at 750 RPM with a 3.21:1 ratio is generating over 2.5kW (91 Amps)!

Best-in-Class Performance

The ARCO Zeus A4000-24V alternator turns on at lower RPMs, runs cooler and provides more power than older designs that are larger and heavier. The newest generation of 24V performance has arrived.

True 24V Alternators

Competitor’s 24V alternators utilize a 12V rotor and field current which is less efficient and limits output at all RPMs. ARCO utilizes a native 24V rotor and field current. This results in our 24V alternator running cooler than competitor’s 24V alternators, having a direct impact on alternator lifespan.

ARCO Zeus 24V High Amperage Alternators, A4000-24V LTO or A7000-24V: Which One’s Right for You?

Choose A4000-24V LTO if:

• You prioritize charging at idle (at campsite or anchor)
• You need to limit power take-off i.e. smaller engine
• You are willing to trade some top-end output for increased output
  at low RPMs

*On the power curve graph, select A4000-24V LTO for use cases left of the Decision Point; otherwise, select A7000-24V.

If these do not apply to you, check out the A7000-24V page here.

• Replace your noisy generator!
• Engineered for high energy production.
• Suitable for marine, RV, military, and commercial applications.
• Rapidly charges large battery banks.
• Coolest operating temperatures for increased performance:
  • Heat shedding coatings
  • Rectifier located on housing exterior
  • Dual cooling fans
  • OEM components
• Optimized for performance at cruising speeds.
• Reduces the need for a generator by creating additional power with your engine.
• Unleash peak performance with E-Coat/Cerakote, keeping the high amp alternator cooler for sustained amperage output.
• For maximum performance or lithium battery charging, use the ARCO Zeus Bluetooth Alternator Regulator.
• Mercedes requires the use of a clutch pulley on secondary alternators used on all Sprinter vans. For Mercedes Sprinter, please use our N62 with Clutch Pulley here.
• SAE J1171 Certified.
• Proudly made in the U.S.A.

Isolated ground only for marine units.

External Only (EX): These units will come with a terminal block and a P-Type harness. They will only work with an external regulator, such as an ARCO Zeus Bluetooth alternator regulator.

To measure sustained output, the alternator is run at 3,000 RPMs for 60 minutes with a plexiglass shield covering the units. Testing shows that after 60 minutes in these conditions, alternators reach their maximum operating temperature, or the conditions under which the unit will produce the least output.

It is under these harsh conditions where we measure the “hot” output of the units at various RPMs. The complete power curve is shown above.

Note: The “hot” conditions are much less favorable than the conditions typically used in the industry. The temperature of the stator during our “hot” test was 305 °F. Incumbents measure the power curve at an ambient temperature of 140 °F. “Cold” testing was done at 71° F.

ARCO Zeus High Energy Datasheet

ARCO Zeus Alternator Wiring Instructions