Simpliphi 6.6kWh, 48 Volt Stackable Lithium Battery
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Visit CalculatorThe SimpliPhi 6.6 Battery from Briggs & Stratton Energy Solutions is a high-performance 48V lithium iron phosphate (LiFePO₄) energy storage module designed for scalable residential and commercial battery systems. With a rated capacity of 6.65kWh and a wire-free stackable architecture, the system simplifies installation while maintaining reliable performance and high energy efficiency. Built with advanced lithium chemistry, durable powder-coated steel housing, and high surge capability, the SimpliPhi 6.6 battery provides dependable energy storage for solar systems, backup power applications, and hybrid energy solutions.
Wire-Free Stackable Design – Innovative stacking architecture allows multiple batteries to connect without complex wiring.
6.65kWh Energy Capacity – High-capacity lithium battery designed for reliable energy storage in residential and light commercial systems.
Advanced LiFePO₄ Chemistry – Lithium iron phosphate technology delivers excellent safety, long cycle life, and thermal stability.
High Continuous Power Output – Supports up to 130A continuous charge and discharge current for demanding energy applications.
High Surge Capability – Provides 240A surge for 2 seconds or 300A surge for 1 second to support startup loads.
High Efficiency Performance – Minimum 96% round-trip efficiency ensures minimal energy loss.


Everything you need is included with your product.
| Specification | Details |
| Maximum Modules per Stack | 1 |
| Maximum Batteries per System | 18 (6 Stacks of 3 - 119 kWh) |
| Full Stack Dimensions | H: 60.4” x W: 28.6” x D: 6.7” |
| Certifications | UL 9540 Edition 3, UL 9540A, UL1973, UL 1998 + 991, UN 38.3, UN 3480, IEC62619 |
What is the capacity of the SimpliPhi 6.6 battery?
The battery provides 6.65kWh of energy storage with a nominal voltage of 51.2V.
How many batteries can be stacked together?
The system is designed for stackable configurations, allowing multiple batteries to be installed for expanded capacity.
What type of battery chemistry is used?
The battery uses Lithium Iron Phosphate (LiFePO₄) chemistry for safety and long cycle life.
What is the maximum continuous current?
The battery supports 130A continuous charge and discharge current.
What is the round-trip efficiency?
The battery has a minimum efficiency rating of 96%.
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