EndurEnergy Systems ESP

Name: EndurEnergy Systems ESP
Brand: EndurEnergy Systems

5.1 kWh · 4.5 kW · Lithium Ion

UL 1973CEC listed · Jun 21, 2022

Overview

CEC Battery List

ESP: 5.1 kWh nameplate energy; 4.5 kW continuous; lithium ion.

CEC Battery List

NLR PVWatts v8 · Cali-Graf calculation

Solar array size that refills the battery from empty in one average day, before the home uses any of it (NLR PVWatts v8, 20° south roof).

CEC Battery List

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
Shanghai PYTES Energy E-BOX-48100R	5.1 kWh	2.56 kW	Lithium Ion	10 years	1
APsystems (Altenergy Power System) APbattery	5.2 kWh	5 kW	Lithium Iron Phosphate	—	—
MANGO POWER TECH M Battery xkWh	5 kWh	5.12 kW	Lithium Ion	10 years	—
StackRack Battery Systems SRxK-UL	5.1 kWh	2.56 kW	Lithium Iron Phosphate	10 years	—
Storz Power SPx.xx-LFPv4	5.1 kWh	5.12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics EG4-LL	5.1 kWh	5.12 kW	Lithium Iron Phosphate	10 years	—

Same segment, similar capacity; each row from the same sources.

California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.
California Energy Commission — Battery List, data as of Oct 7, 2026.
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).