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Ships within 48 hours · Estimated delivery Aug 14 - Aug 19
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Description
ARCO Marine Zeus A275L J-180 4" Alternator w/Terminal Block [4022]Zeus A275L J 180 4" Alternator with Terminal Block The highest power output alternator in its size class. Features: Engineered for High Energy Production. Suitable for Marine, RV, Military, and Commercial applications. Rapidly charges large battery banks. Coolest operating temperatures for increased performance. It runs 8 20% cooler than incumbent alternators due to heat shedding coatings, a refrigerator on the housing exterior, dual cooling fans, and
Zeus A275L J-180 4" Alternator with Terminal Block
The highest power output alternator in its size/class.
Features:
- Engineered for High Energy Production.
- Suitable for Marine, RV, Military, and Commercial applications.
- Rapidly charges large battery banks.
- Coolest operating temperatures for increased performance.
- It runs 8 - 20% cooler than incumbent alternators due to heat-shedding coatings, a refrigerator on the housing exterior, dual cooling fans, and OEM components.
- It is optimized for performance at idle speeds.
- Reduces the need for a generator by creating additional power with your engine.
- Unleash peak performance with E-Coat/Cerakote. Our advanced coating absorbs less heat, keeping the A275L cooler. This translates to more amperage for sustained periods.
- Use an ARCO Zeus Bluetooth alternator regulator or lithium battery charging for maximum performance.
- SAE J1171 Certified.
- Made in the U.S.A.
Technical Specifications:
- Voltage - 12v
- Field Type - P
- Rotor Poles - 16
- Stator Size - 138mm
- Frame Size - Large
- Weight - 14.9 lbs/6.7 kg
- Regulation - External Only (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.)
- 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) - 311 Amps
- Sustained Cruising Output (Hot, 6,000 RPM) - 227 Amps
- Sustained Idle Output (Hot, 3,000 RPM) - 198 Amps
- Max Continuous Operating Temperature - 110°C / 230°F
Mounting Application:
- Replaces most Volvo Penta alternators using a 4” J180 saddle-style mount
Quick Guide (pdf)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 5
A Versatile & Stylish Solution for Instant Privacy and Space Definition
Color: Black
This AKTOP Room Divider is an absolute game-changer for creating flexible spaces in my open-plan apartment. The 71"x71" single panel is substantial, providing excellent visual privacy without making an area feel completely closed off. The sleek, minimalist black frame looks modern and professional, easily blending into my home office and living area. I've used it to section off a dedicated workspace, creating a psychological barrier from household distractions, and it works equally well as a stylish backdrop for video calls.
What I love most is its freestanding and portable design. It requires no tools, drilling, or installation—I simply unfold it and place it wherever I need a temporary wall. It feels remarkably stable and well-made, with a sturdy metal frame and durable fabric that doesn't sag. The size is perfect for most applications. Whether you need to divide a dorm room, create a private nook in a studio, or set up a temporary partition in an office, this screen delivers fantastic functionality and style with zero commitment. It's a brilliantly simple and effective product.
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Reviewed in the United States on February 5, 2026
★★★★★ 5
Turning One Big Room into Two
Color: Black
My apartment is basically one big open space, so my living room, dining table, and “office” used to all blend together. After I got this screen, the whole layout finally makes sense. I set it up in the middle and now I have a clear work side and a chill side, and my background for video calls looks way more professional. This divider is a fixed style, so when you set it down it forms a nice straight line. Visually it really feels like a light, mini wall, which is perfect for breaking up a large area. It’s tall and long enough that it actually blocks what you want to hide, so you get real privacy, not just a decorative panel. The woven texture looks nice up close and doesn’t feel cheap, and the color is easy to match with other furniture. It’s not overly heavy either and I can slide it to a new spot by myself when I want to change the room layout. Most days I pull it out as a clean background for meetings and classes, and when I don’t need it as a divider I just move it against the wall and it still looks good there. If you have a big open room or a rental and want to create separate zones without doing any construction, this screen is a simple, effective solution. I’m already recommending it to friends who need more privacy in their space.
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Reviewed in the United States on December 29, 2025
★★★★★ 4
AKTOP Room Divider, Freestanding
Color: Black
AKTOP Room Divider, Freestanding ...all parts fit well and easy to assemble and looks great. Using it for church & move back & forth weekly. Screws come out so I reinforced legs. Better if you don't move around a lot or you will need to reinforce legs. Priced well.
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Reviewed in the United States on March 24, 2026
★★★★★ 5
Worth the purchase
Color: Black
Very easy to set up and one setup provided great privacy for viewing not so much for sound but that's expected and the reason why I got it
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Reviewed in the United States on April 12, 2026
★★★★★ 5
Simple, sturdy and perfect for creating privacy
Color: Black
This room divider is very easy to set up and surprisingly sturdy. It works great for creating a quick private space in a room without installing anything permanently. The fabric looks clean and modern, and it’s lightweight enough to move around when needed. Perfect for separating spaces in a living room or studio.
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Reviewed in the United States on March 14, 2026