Briggs & Stratton AmpliPHI 3.8 Specifications
| Model | AmpliPHI-3.8-48 |
| Total Capacity | 3.87 kWh @ 100% DOD |
| Nominal Voltage | 51.2 VDC |
| Voltage Range | 48 VDC to 56 VDC |
| Amp-Hours | 75 Ah |
| Max Discharge Rate | 37.5 ADC (1.9 kW DC) |
| Max Charge Rate | 37.5 ADC (1.9 kW DC) |
| Surge Rate (10 min) | 100 ADC (5.1 kW DC) |
| Operating Temperature | -4°F to 140°F (-20°C to 60°C) |
| Cycle Life | 10,000+ cycles @ 80% DOD |
| Max System Capacity | 60 batteries (232 kWh) |
| Warranty | 15 Years |

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Briggs & Stratton 48V AmpliPHI 3.8 kWh Lithium Battery
SKU BAS-AMPLIPHI-3.8-48V-BATTERY
AmpliPHI™ 3.8 48V Lithium Battery
The AmpliPHI 3.8 battery system provides 3.87 kWh of energy storage using advanced lithium ferro phosphate (LFP) chemistry that eliminates cobalt, reducing thermal runaway risks and fire propagation potential. This system features an integrated Battery Management System (BMS) with closed-loop communications pre-configured for industry leading inverters, reporting state of charge and other critical real-time data for optimal system performance.
Engineered for maximum versatility across residential and commercial markets, the AmpliPHI 3.8 supports exceptional system scaling with up to 60 batteries per installation, delivering 232 kWh of total energy storage capacity. The 15-year warranty coverage exceeds industry standards while the 5.1 kW surge capability provides enhanced power delivery for high-demand applications.
AmpliPHI™ 3.8 48V Features
- Integrated Battery Management System: Built-in BMS with closed-loop communications reports critical real-time data including state of charge and simplifies installation procedures.
- Pre-Configured Inverter Integration: Ready for seamless integration with industry leading lithium-ready inverters through optimized communication protocols and ease of installation.
- Advanced LFP Chemistry: Cobalt-free lithium ferro phosphate technology delivers safer, more efficient energy storage that outperforms alternative battery solutions.
- Massive System Scalability: Scale up to 60 batteries per system for 232 kWh total capacity, allowing for extensive commercial and large residential storage installations.
- Extended 15-Year Warranty: Industry-leading warranty coverage with UL 9540 and UL 9540A fire safety certifications for enhanced system reliability and peace of mind.
Scalable Replacement & Expansion Solution
The AmpliPHI 3.8 battery excels as an ideal replacement solution for aging lead-acid or early lithium battery systems, offering seamless integration into existing electrical infrastructure. With scalability up to 60 batteries per system (232 kWh total), this battery supports both small residential retrofits and large commercial expansions.

Briggs & Stratton AmpliPHI 3.8 Lithium Battery Review
The AmpliPHI 3.8 battery distinguishes itself through exceptional system scalability and integrated communication capabilities that simplify large-scale installations. The integrated BMS with closed-loop communications eliminates the need for external monitoring equipment while providing real-time data critical for system optimization. The 100 ADC surge capability (5.1 kW) exceeds the PHI 3.8 series performance, making this battery suitable for higher-demand applications and commercial installations.
The 15-year warranty represents the longest coverage period in the Briggs & Stratton battery portfolio, reflecting enhanced confidence in the AmpliPHI platform's long-term reliability. The ability to scale up to 60 batteries per system (232 kWh) opens opportunities for substantial commercial and industrial energy storage projects while maintaining the compact 0.88 ft³ footprint per unit.
Briggs & Stratton AmpliPHI 3.8 Features

Scalable for Any Energy Need
Scale up to 60 batteries to allow for larger storage capacity with the AmpliPHI 3.8 battery.

LFP Battery Chemistry
reduces the risk of thermal runaway, fire propagation, operating temperature constraints, and toxic coolants.

Pair with Leading Inverters
The AmpliPhi 3.8 comes ready to be integrated industry leading inverters for ease of installation.

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