ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator - Isolated Ground

Price
$1,499
Housing:
Description

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.

A4000 -24V high amperage alternator power curve
  • 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.

Technical Specifications

Voltage 24V
Field Type P
Rotor Poles 16
Rotator Source Voltage 24V
Stator Size 138mm
Frame Size Large
Weight of heaviest option (N62 with clutch pulley) 15.89 lbs / 7.2 kg
Regulation External Only (EX)
Finish (Black) E-coating
Cut-In RPM 1,072 Alternator RPM
Maximum Alt RPM 19,000
Battery Post M8 Thread Post, Side Mount
Standard Pulley 49K6 (6-groove, 49mm)
Pulley Mount 17mm diameter shaft, 25mm long, threaded M17 x 1.5
Pulley Hardware M17 x 1.5 x 24mm nut, w/ 18mm ID x 29mm OD washer (Included)
Diodes 6 positive, 6 negative, 50A Rated, Avalanche
Max Output (Cold, 9,000 RPM) at 27.5V 144 Amps - 3,960 Watts – 5.7Kw PTO
Sustained Cruising Output
(Hot, 6,000 RPM) at 27.5V
130 Amps - 3,575 Watts – 5.1Kw PTO
Sustained Idle Output
(Hot, 3,000 RPM) at 27.5V
108 Amps - 2,970 Watts – 4.2kW PTO
Max Continuous Operating Temperature 100°C / 212°F

Mounting Options and Applications

Mounting ARCO Part Number Application
1-2” Single Foot 4405 Replaces most domestic styles using a single 1” or 2” mounting foot (e.g., Motorola, Prestolite).
3.15” J180 Saddle 4401 Replaces most small case styles using a 3.15" J180 saddle style mount (e.g., Hitachi, Lucas, Mitsubishi) Most Yanmars.
3.15"R Saddle Mount, Rear Exit B+ 4402 Must Be used on Yanmar Common Rail Engines introduced after 2013 (JH-CR, 3JH40, 4JH45, 4JH57, 4JH80, 4JH110).
4” J180 Saddle 4403 Replaces most Volvo Penta alternators using a 4” J180 saddle style mount.
Vortec/GM 4406 Replaces Mando type alternators using Vortec/GM pad mounting feet. (Found on many Mercruiser and Volvo Penta 3.0GLM, 3.0GLP, 4.3GXi, 5.7GiL, 5.7GXiL Marine Engines).
N62 (Clutch Pulley) 4404 Replaces factory dual alternator on many Sprinter RVs, including Roadtrek, Thor, Winnebago, and others.
For all Mercedes Sprinter applications with N62 option.
Meets current Mercedes Upfitter weight and PTO requirements.
Isolated ground only for marine units.

Regulation

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.

Transparency - How We Test For Output

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.

Cross-Reference

ARCO Zeus 24V 4Kw LTO APS Mechman Balmar
4401, 4402 360HSB1H652S9E4 - -
4403 42I-270-14JEXT/STA - -
4404 360HN621H652S9CE4 - -
4405 - - -
4406 - - -

SKU Details

Voltage Maximum
Output (Amps)
Sustained Idle
Output (Amps)
Housing Regulation Pulley Unit Part #
24V 144 108 Vortec (GM) External Only 49mm K6 4406
24V 144 108 1"-2" Single Foot External Only 49mm K6 4405
24V 144 108 N62 Clutch Pulley External Only 50mm K6 Clutch Pulley 4404
24V 144 108 3.15" J180 External Only 49mm K6 4401
24V 144 108 3.15" J180 Common Rail External Only 49mm K6 4402
24V 144 108 4" J180 External Only 49mm K6 4403

Support and Downloads

ARCO Zeus High Energy Datasheet

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ARCO Zeus Alternator Wiring Instructions

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