HIGH OUTPUT ALTERNATOR
The Highest Power Output
Alternator in its Size/Class
A225S High Output Alternator
- Engineered for High Energy Production.
- Suitable for Marine, RV, Military, and Commercial applications.
- High-density, ultra-efficient stator winding produces maximum energy output.
- Rapidly charges large battery banks.
- Coolest operating temperatures for increased performance. Runs 8 – 20% cooler than incumbent alternators due to:
• Heat-shedding coatings
• Rectifier located on housing exterior
• Dual cooling fans
• OEM components
- Optimized for performance at idle speeds.
- Reduces need for generator by creating additional power with your engine.
- Unleash peak performance with E-Coat/ Cerakote. Our advanced coating dissipates heat, keeping the A225s cooler.
This translates to more amperage for sustained periods. - For maximum performance or lithium battery charging, use an ARCO Zeus Alternator Regulator.
- SAE J1171 Certified.
| 3.15″ J180 | 1″-2″ | Vortec | |
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IN A CLASS OF ITS OWN…
GET AMPED
The ARCO Zeus A225s introduces the highest power density of any alternator in its class
TRANSPARENCY IN OUR TESTING
*To measure sustained HOT output, the alternator is run at 3,000 RPMs for 60 minutes with a plexiglass shield covering the unit. After 60 minutes in these conditions, alternators reach their maximum operating temperature. It is under these harsh conditions where we measure the “HOT” output of the units at various RPMs (see above). The complete power “COLD” testing was done at 71° F (21.5° C).
| Voltage | Maximum Output(Amps) | Sustained Idle Output*(Amps) | Housing | Regulation | Pulley | Release Date | Unit Part # |
| 12V | 254 | 187 | Vortec (GM) | External Only | 49mm K6 (6 groove) | June, 2024 | A225s-12-VT-EX-49K6 |
| 12V | 254 | 187 | Vortec (GM) | Internal or External | 49mm K6 (6 groove) | June, 2024 | A225s-12-VT-IE-49K6 |
| 12V | 254 | 187 | 1″-2″ Single Foot | External Only | 49mm K6 (6 groove) | June, 2024 | A225s-12-SF12-EX-49K6 |
| 12V | 254 | 187 | 1″-2″ Single Foot | Internal or External | 49mm K6 (6 groove) | June, 2024 | A225s-12-SF12-IE-49K6 |
| 12V | 254 | 187 | 3.15″ J180 | External Only | 49mm K6 (6 groove) | June, 2024 | A225s-12-DF315-EX-49K6 |
| 12V | 254 | 187 | 3.15″ J180 | Internal or External | 49mm K6 (6 groove) | June, 2024 | A225s-12-DF315-IE-49K6 |
*3,000 alternator RPM sustained under load and hot conditions for 1 hour.
SPECIFICATIONS
| Voltage | 12V |
| Field Type | P |
| Rotor Poles | 16 |
| Stator Size | 130mm |
| Frame Size | Small |
| Weight | 12 lbs / 5.4 kg |
| Regulation | Internal/External (IE) or External Only (EX) |
| Output Voltage | 14.1V (default) |
| Finish | (Black) Cerakote or E-coating |
| Cut-In Alt. RPM | 1,196 |
| Maximum Alt RPM | 19,000 |
| Battery Post | M8 Thread Post, Side Mount |
| Standard Pulley | 49K6 (6-groove, 49mm); 50mm Clutch Pulley (Optional) |
| 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) | 254 Amps |
| Sustained Cruising Output (Hot, 6,000 RPM) | 187 Amps |
| Sustained Idle Output (Hot, 3,000 RPM) | 157 Amps |
| Max Continuous Operating Temperature | 110°C/230°F |
APPLICATIONS
| Mounting | ARCO Part Number | Application |
| 1-2” Single Foot | A225s-12-SF12-EX-49K6 A225s-12-SF12-IE-49K6 | Replaces most domestic styles using a single 1” or 2” mounting foot (e.g., Motorola, Prestolite) |
| 3.15” J180 Saddle | A225s-12-DF315-EX-49K6 A225s-12-DF315-IE-49K6 | Replaces most small case styles using a 3.15″ J180 saddle style mount (e.g., Hitachi, Lucas, Mitsubishi) Most Yanmars. |
| Vortec | A225s-12-VT-EX-49K6 A225s-12-VT-IE-49K6 | Replaces Mando type alternators using Vortec/ GM pad mounting feet (FoundonmanyMercruiserandVolvoPenta3.0GLM,3.0GLP,4.3GXi,5.7GiL,5.7GXiLMarineEngines.) (GM Blocks) |
ARCO’S BEST IN CLASS WARRANTY AT YOUR SERVICE
Register for your warranty at arcomarine.com/arco-product-registration
1 year parts and labor with a second year extension if registered within 30 days.
arcomarine.com
sales@arcomarine.com
Toll Free: 1-800-722-2720
Fax: 850-453-2630
3921 W. Navy Blvd.
Pensacola, FL 32507
Documents / Resources
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ARCO Marine A225S High Output Alternator [pdf] Owner's Manual 3.15, 1-2, J-180, Vortec, A225S High Output Alternator, A225S, High Output Alternator, Output Alternator |