AmpliPHI™ 3.8-M Battery

The AmpliPHI™ 3.8 Battery utilizes advanced Lithium Ferro Phosphate (LFP) chemistry that eliminates cobalt which reduces the risk of thermal runaway, fire propagation, operating temperature constraints, and toxic coolants to deliver more efficient, safer and reliable energy storage. Designed and built with versatility in mind, the AmpliPHI 3.8 Battery features a Battery Management System (BMS) with closed loop communications pre-configured for industry leading inverters that reports SOC and other critical real-time data, optimizing the value of storage and functionality within balance-of-system equipment. Combined with our proven overcurrent protection (OCPD) and accessible 100 Amp DC breaker On/Off switch, installation time is reduced and safety is increased during set-up, making it an ideal solution for battery replacement, expansion of existing systems, or as a new installation for residential and commercial systems, on and off-grid, scalable up to 60 batteries.

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Battery Management System (BMS)

Closed-loop communication reports critical real-time data and simplifies installation.

Pair with Leading Inverters

Ready to be integrated industry leading inverters for ease of installation.

Lithium Ferro Phosphate (LFP) Chemistry

Peace of mind that the elimination of cobalt reduces the risk of thermal runaway, fire propagation, operating temperature constraints, and toxic coolants.

Scalable for Any Energy Need

Scale up to 60 batteries to allow for larger storage capacity.


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Model Number
DC Voltages - Nominal
51.2 VDC
75 Ah
Rated kWh Capacity @ C/2
3.8 kWh DC @ 100% DOD
3.04 kWh DC @ 80% DOD
MAX Surge Discharge Rate (10 Minutes)
100 amps DC (5.1 kW DC)
MAX Continuous Discharge Rate
37.5 Amps DC (1.9 kW DC)
MAX Continuous Charge Rate
37.5 Amps DC (1.9 kW DC)
DC Voltage Range¹
48 VDC to 56 VDC
Depth of Discharge¹
up to 100%
Charging Temperature¹
32° to 120° F (0° to 49° C)
Operating Temperature¹
-4° to 140° F (-20° to 60° C)
Storage Temperature¹
6 months: 14° to 77° F (-10° to 25° C)
3 months: -4° to 113° F (-20° to 45° C)
Self-Discharge Rate
< 1% per month (when off)
Cycle Life
10,000+ cycles (@ 80% DOD)
Memory Effect
IP Rating
Warranty Period
15 Years
86 lbs. (39 kg)
Dimensions (W x H x D)
13.5 x 14 x 8 in. (15.5” H w/terminals) / 0.88 ft3
(34.3 x 35.6 x 20.3 cm / 0.025 m3)
3/8 IN (10 mm)
Battery Cables
Installation Manual

1 Max operating ranges. Refer to Installation Manual for recommended conditions.
All specifications listed are typical/nominal and subject to change without notice.
Engineered and Manufactured in California, USA.
Briggs & Stratton has a policy of continuous product improvement and reserves the right to modify its specifications at any time and without prior notice.