AmpliPHI™ 3.8-M Battery

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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 75 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 75 batteries to allow for larger storage capacity.


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Model Number
Cycle Life
10,000+ cycles (@ 80% DOD)
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)
86 lbs. (39 kg)
Warranty Period
10 Years
Memory Effect
Charge Temperature1
32° to 120° F (0° to 49° C)
Operating Temperature1
-4° to 140° F (-20° to 60° C)
SelfDischarge Rate
< 1% per month (when off)
DC Voltage Range1
48 VDC to 56 VDC
DC Voltages Nominal
51.2 VDC
75 Ah
Installation Manual
MAX Continuous Charge Rate
37.5 Amps DC (1.9 kW DC)
MAX Surge Discharge Rate 10 minutes
100 amps DC (5.1 kW DC)
IP Rating
Depth of Discharge1
up to 100%
Storage Temperature1
6 months: 14° to 77° F (-10° to 25° C)
3 months: -4° to 113° F (-20° to 45° C)
3/8 IN (10 mm)
Battery Cables
Rated kWH Capacity C2
3.8 kWh DC @ 100% DOD
3.04 kWh DC @ 80% DOD
MAX Continuous Discharge Rate
37.5 Amps DC (1.9 kW DC)

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.