- Description
- Technical Specifications
- Mounting Options & Applications
- Regulation
- Transparency - How we test for output
- Cross-Reference
THE HIGHEST POWER OUTPUT ALTERNATOR IN ITS SIZE/CLASS
- Engineered for High Energy Production.
- Suitable for Marine, RV, Military, and Commercial applications.
- 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 absorbs less heat, keeping the A225S cooler. This translates to more amperage for sustained periods.
- For maximum performance or lithium battery charging, use an ARCO Zeus Bluetooth alternator regulator.
- SAE J1171 Certified.
- Proudly made in the U.S.A.
Click here to optimize your alternator's output with the ARCO Zeus Bluetooth alternator regulator.
| Voltage | 12V |
| Field Type | P |
| Rotor Poles | 16 |
| Stator Size | 130mm |
| Frame Size | Small |
| Weight | 12 lbs / 6.7 kg |
| Regulation | Internal/External (IE) or External Only (EX) |
| Output Voltage | 14.1V (default) |
| Finish | (Black) Cerakote or E-coating |
| Cut-In RPM | 1,061 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) | 254 Amps |
| Sustained Cruising Output (Hot, 6,000 RPM) |
187 Amps |
| Sustained Idle Output (Hot, 3,000 RPM) |
157 Amps |
| 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 1or 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/GM | A225S-12-VT-EX-49K6 A225S-12-VT-IE-49K6 |
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.) (GM Blocks ) |
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.
Internal/External (IE): Internally regulated with adaptor for optional external regulation.
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 A225S | APS | Mechman | Balmar |
| A225S-12-DF315-EX-49K6 | 255HSB1H652S9E4 | - | - |
| A225S-12-DF315-IE-49K6 | - | - | XT-CR-170-K6 |
| A225S-12-SF12-EX-49K6 | - | - | - |
| A225S-12-SF12-IE-49K6 | - | M7294170 | XT-SF-170-K6 |
| A225S-12-VT-EX-49K6 | - | - | - |
| A225S-12-VT-IE-49K6 | 255HGM1H652S9 | M8237170 | XT-VT-170-K6 |
