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125.4–329.3 kWh

Commercial energy storage systemPylontech

Pylontech Optim US-B1-M5A180-A-ex/xxx.xx-US-05

125.4–329.3 kWh · 62.7–164.6 kW · Lithium Iron Phosphate · 12 configurations

UL 9540CEC listed · Jun 11, 2026

Nameplate energy125.4–329.3 kWh
Continuous power62.7–164.6 kW
ChemistryLithium Iron Phosphate

Overview

CEC Energy Storage System List

Optim US-B1-M5A180-A-ex/xxx.xx-US-05: 125.4–329.3 kWh nameplate energy; 62.7–164.6 kW continuous; lithium iron phosphate.

Models & configurations

CEC Energy Storage System List · 12 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
Optim US-B1-M5A180-A-ex/125.44-US-05	125.4 kWh	62.72 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/141.12-US-05	141.1 kWh	70.56 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/156.8-US-05	156.8 kWh	78.4 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/203.84-US-05	203.8 kWh	101.92 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/219.52-US-05	219.5 kWh	109.76 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/235.2-US-05	235.2 kWh	117.6 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/250.88-US-05	250.9 kWh	125.44 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/266.56-US-05	266.6 kWh	133.28 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/282.24-US-05	282.2 kWh	141.12 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/297.92-US-05	297.9 kWh	148.96 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/313.6-US-05	313.6 kWh	156.8 kW	—	—	Jun 11, 2026
Optim US-B1-M5A180-A-ex/329.28-US-05	329.3 kWh	164.64 kW	—	—	Jun 11, 2026

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)125.4–329.3 kWh
Rated power (CEC)62.7–164.6 kW
Max continuous discharge (CEC)62.7–164.6 kW
Full-power discharge timeabout 2 h at full power
ChemistryLithium Iron Phosphate

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by TUV Rheinland of North America
Certificate date & editionApr 7, 2024 · Ed. 3 : 2023

UL 9540 certifies the whole storage system; UL 9540A is the fire-propagation test that fire codes ask for indoors and near walls.

California grid & code compliance

CEC Energy Storage System List

UL 1741 SB (IEEE 1547-2018)No
UL 1741 SA (Rule 21)No
CSIP (IEEE 2030.5)No
JA12 declaration (Title 24)No

Questions & answers

How much energy does the Pylontech Optim US-B1-M5A180-A-ex/xxx.xx-US-05 store?

125.4–329.3 kWh nameplate, per the California Energy Commission list.

Is the Optim US-B1-M5A180-A-ex/xxx.xx-US-05 UL 9540 certified?

Yes — the CEC list shows UL 9540 certification (certified by tuv rheinland of north america).

Sources

California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.