SimpliPHI 1.4 24V Lithium Ferro Phosphate Battery (by Briggs & Stratton)
Delivery on Dec 17–22
SimpliPHI 3.8 48V Lithium Ferro Phosphate Battery (by Briggs & Stratton)
Delivery on Dec 17–22
SimpliPHI 3.8 24V Lithium Ferro Phosphate Battery (by Briggs & Stratton)
Delivery on Dec 17–22
Delivery on Dec 17–22
SimpliPHI 6.6 48V Lithium Ferro Phosphate Stackable Battery (by Briggs & Stratton)
Delivery on Dec 17–22
Stackable battery technology enables homeowners to scale energy capacity from 5 kWh to 50 kWh through modular units that connect without complex rewiring. Unlike traditional monolithic systems, stackable designs allow adding capacity by simply stacking battery modules vertically or connecting them in parallel configurations.
Each module contains integrated battery management systems (BMS) that communicate through CAN bus or RS485 protocols, creating a self-regulating network that automatically balances charge distribution. Installation requires no electrical wiring when expanding—additional modules connect through simple-click architecture.
Lithium iron phosphate (LiFePO₄) dominates the residential stackable market due to superior safety and longevity, representing approximately 78% of installations.
Daily deep discharge applications benefit from LiFePO₄'s 6,000 cycle life at 80% depth of discharge. Calculate annual cycles by multiplying daily discharge depth by 365. A battery rated for 6,000 cycles with 60% daily discharge delivers approximately 27 years of service.
Sergey Fedorov, Co-founder & CTO
Round-trip efficiency measures energy retained through charge-discharge cycles, with modern LiFePO₄ systems achieving 93-97%. Each percentage point of efficiency loss translates to wasted energy during operation.
💡 Real-World Cost Example: A system cycling 5,000 kWh annually with a 5% efficiency difference requires 250 kWh additional solar production. This represents $50-$75 annual loss at typical electricity rates, accumulating to $750-$1,100 over 15 years per efficiency percentage point.
EG4 LifePower4 Series
Delivers 5.12 kWh per module with 6,000 cycle life and 99% efficiency. Features 100A internal BMS and supports parallel expansion for systems up to 51.2 kWh.
Modular design starting at 10 kWh, expandable to 20 kWh through vertical stacking. Includes wireless communication and 10-year warranty coverage.
Fortress eVault Series
High-capacity option with 18.5 kWh base configuration, scalable to 37 kWh. Integrates seamlessly with most hybrid inverters through CAN/RS485 protocols.
Wire-free stackable design with 3.5 kWh modules. RapidStak connector technology eliminates manual wiring, enabling sub-15-minute module additions.
UL 9540 certification has become mandatory for North American installations, establishing thermal runaway containment protocols. UL 9540A specifically tests large-scale thermal events, while IEC 62619 covers international safety standards.
Calculate seasonal production ratio by dividing winter output by summer output. Multiply battery capacity by this factor to determine required solar array size. Example: 15 kWh battery with 0.6 seasonal factor needs 25 kWh summer production capability.
Sergey Fedorov, Co-founder & CTO
Practical constraints emerge despite modular architecture. Inverter capacity typically limits effective battery storage—a 10 kW inverter optimally supports 20-25 kWh without creating charge/discharge bottlenecks.
Modern systems implement Modbus TCP/IP and IEEE 2030.5 protocols enabling participation in virtual power plant programs. Early VPP participants earn $200-$400 annually per 10 kWh committed capacity.
LiFePO₄ stackable batteries typically deliver 6,000 charge cycles at 80% depth of discharge, translating to 15-25 years of service in daily-use applications. Actual lifespan depends on usage patterns, operating temperature, and maintenance practices.
Mixing battery brands within the same stack is not recommended. Different manufacturers use varying BMS protocols, voltage curves, and cell chemistries that can create imbalances and reduce system performance. Always expand with identical models from the same manufacturer.
A typical installation requires approximately 1.5-2 square meters of floor space, including mandatory ventilation clearances. Stack height ranges from 1.5 to 2.2 meters depending on configuration. Indoor installations work best in climate-controlled environments between 15-25°C.
Stackable LiFePO₄ batteries require minimal maintenance. Annual inspections should verify connection integrity, check for firmware updates, and clean ventilation areas. Unlike lead-acid systems, no water refilling or equalization charging is needed. Most systems include remote monitoring for proactive issue detection.
Ready to Scale Your Energy Storage?
Explore our selection of stackable battery systems designed for seamless expansion. Start with the capacity you need today and grow as your energy demands increase.
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