ARCO 12V 275A DF4, Side Battery Post, Externally Regulated, Isolated Ground, 49mm K6 Pulley
Marine high output alternator with isolated ground, external regulation, advanced cooling and strong low-speed charging for large battery bank installations.
SKU: ARC.4023 | MPN: 4023
SAVE $499.58 (23%)
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Non Returnable/Non Refundable
High Output Marine Alternator for Large Battery Banks and Engine-Driven Charging
The ARCO Zeus high output alternator is built for marine, RV, commercial and other demanding engine-driven charging systems where substantial battery charging capacity is required. Its large-frame construction combines an externally mounted rectifier, dual cooling fans and heat-dissipating surface treatment to manage operating temperature during sustained charging. Strong output at lower engine speeds supports battery replenishment while underway or at idle, helping reduce reliance on a separate generator. This variant uses a J180 mounting configuration with isolated ground and external regulation, allowing integration with a compatible alternator regulator for controlled charging of lead-acid and lithium battery systems.
Key Features
- High-output battery charging: Supports rapid replenishment of large house battery banks in marine, RV and commercial electrical systems.
- Strong idle performance: Maintains substantial charging output at lower alternator speeds where conventional alternators may produce significantly less current.
- External regulation: Intended for use with a compatible external alternator regulator, allowing charging behaviour to be matched to the connected battery system.
- Lithium charging compatibility: Can be integrated with a suitable external regulator for controlled charging of lithium battery installations.
- Enhanced thermal management: External rectifier placement, dual cooling fans and heat-dissipating surface treatment help control temperature during sustained operation.
- Isolated ground configuration: Separates the alternator ground from the housing for installations requiring an isolated electrical return path.
- J180 mounting: Suitable for compatible engines using the established saddle-style alternator mounting arrangement.
- Marine certification: Certified for ignition-protected marine applications.
- Engine-driven energy production: Generates substantial charging power from the propulsion engine, reducing dependence on a separate generator in appropriately configured electrical systems.
- Replaceable regulation architecture: External regulation provides additional flexibility for advanced charging and battery-management installations.
The alternator is suited to installations requiring sustained engine-driven charging, high battery demand and external charge regulation, particularly in marine and mobile power systems.
| Voltage | 12 V |
| Maximum Output – Cold | 311 A at 9,000 alternator RPM |
| Sustained Cruising Output – Hot | 227 A at 6,000 alternator RPM |
| Sustained Idle Output – Hot | 198 A at 3,000 alternator RPM |
| Default Output Voltage | 14.1 V |
| Housing | 4 in J180 saddle |
| Regulation | External only |
| Ground Type | Isolated ground |
| Field Type | P-Type |
| Rotor Poles | 16 |
| Stator Size | 138 mm |
| Frame Size | Large |
| Cut-In Speed | 1,061 alternator RPM |
| Maximum Alternator Speed | 19,000 RPM |
| Maximum Continuous Operating Temperature | 110 °C |
| Battery Post | M8 threaded side-mount post |
| Standard Pulley | 49K6, 6-groove, 49 mm |
| Pulley Shaft | 17 mm diameter × 25 mm long, M17 × 1.5 thread |
| Pulley Hardware | M17 × 1.5 × 24 mm nut with 18 mm ID × 29 mm OD washer |
| Diodes | 6 positive and 6 negative, 50 A avalanche rated |
| Weight | 6.7 kg |
| Finish | Black Cerakote or E-coating |
| Certification | SAE J1171 |
| SKU | ARC.4023 |
| Model # | 4023 |
| UPC/EAN | 695845769955.00 |
| Brand | Arco Marine |
| Shipping Weight | 7.0000kg |
| Shipping Width | 0.180m |
| Shipping Height | 0.150m |
| Shipping Length | 0.220m |
| Shipping Cubic | 0.005940000m3 |
| Unit Of Measure | ea |
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