Arkpax Expansion Battery for Ark PRO

The Arkpax Expansion Battery for Ark PRO adds an additional 2300Wh of capacity, extending runtime for critical loads during off-grid deployments, marine environments, professional job sites, and emergency backup applications.

Engineered for seamless integration with the Ark PRO platform, this expansion module connects directly to the main unit, increasing total system capacity without adding operational complexity. Supporting up to 10 expansion batteries, the Ark PRO system can scale to approximately 25.3kWh — transitioning from portable power to extended-duration energy infrastructure.

Built with the same IP67-rated sealed enclosure as the Ark PRO, this expansion battery is fully protected against dust and water intrusion, ensuring reliable performance in harsh and unpredictable conditions.

Powered by advanced LiFePO4 (LFP) battery chemistry, it is rated for over 3,000 cycles to 80% capacity, delivering long-term durability and dependable capacity retention.

Best for: 

• Extending runtime for Ark PRO systems

• Long-duration off-grid deployments

• Marine & dockside backup power

• Job sites requiring extended operation

• Emergency preparedness & outage protection

Features

• 2300Wh Expansion Capacity – Increases total runtime of the Ark PRO system for extended off-grid or backup applications.

• Scalable System Design – Supports connection of up to 10 expansion batteries for large-capacity energy configurations.

• IP67 Dustproof & Waterproof Construction – Fully sealed UltraSeal enclosure built for harsh marine and outdoor environments.

• Advanced LiFePO4 Battery Chemistry – Rated for 3000+ cycles to 80% capacity for long-term durability.

• Seamless Integration with Ark PRO – Built-in expansion cable for direct connection without additional accessories.

• Fast Recharge via Ark PRO – Recharges in approximately 2 hours when connected to the main unit (1500W input).

Specification

Official Specification & Manual (PDF)

Warranty
2-Year Manufacturer's defect Warranty

Battery Type
LiFePO4 (LFP) Lithium Iron Phosphate

Rated Capacity
2300Wh

DC Expansion Interface

• 2 × DC Expansion Ports
• Input: 57.6V Max, 45A Max
• Output: 40–57.6V, 85A Max
• Max Output Power: 2300W
• System Expansion Max: 4600W

Charging Options

Recharge Time: ~2 Hours (1500W via Ark PRO)

Expandability

• Compatible with Ark PRO
• Up to 10 Expansion Units
  
• Maximum System Capacity: ~25.3kWh

IP Rating
IP67 Dustproof & Waterproof

Operating Temperature

• Discharging: -10° to 45°C (14° to 113°F)
• Charging: 0° to 45°C (32° to 113°F)

Weight
46.7 lbs (21.2 kg)

Dimensions
16.54" L × 10.83" W × 9.09" H

Connectivity

None (Direct Expansion Connection via Built-in Cable)