Usable energy beside nominal energy

Nominal energy is the stated total stored energy. Usable energy is the stated amount available to draw. The bars use a separate scale for each battery. Batteries are ordered by usable share, highest first.

Enphase IQ Battery 10C

The maker states the same figure for usable and nominal energy.

Spec sheet, at p.2 / Battery, retrieved Sep 25, 2026, dated Jul 22, 2026Usable capacity 10.0 kWh, Total capacity 10.0 kWh

Enphase IQ Battery 5P

The maker states the same figure for usable and nominal energy.

Spec sheet, at p.2 / Battery, retrieved Sep 23, 2026, dated May 6, 2025 Not yet checked

PowerPlus Energy ECOSERIES Eco4847P

The maker states the same figure for usable and nominal energy.

Spec sheet, at p1 / specifications, retrieved Sep 23, 2026, dated Sep 25, 2025 Not yet checked

PowerPlus Energy LiFe Premium LiFe4838P

The maker states the same figure for usable and nominal energy.

Spec sheet, at p1 / specifications, retrieved Sep 23, 2026, dated Sep 9, 2026 Not yet checked

GoodWe Lynx Home U G3 (LXU 5.0-30)

97% of nominal energy is usable.

Spec sheet, at p2, Technical Data, retrieved Sep 23, 2026, dated Jul 2, 2025 Not yet checked

PointGuard Energy PG BatteryPack 8.0

96% of nominal energy is usable.

Web page, at Battery Pack / Performance specs, retrieved Sep 25, 2026 Not yet checked

PointGuard PGHome-11.4-16.12

96% of nominal energy is usable.

Spec sheet, at p.1 / Flexible capacity combinations, retrieved Sep 25, 2026 Not yet checked

PointGuard PGHome-11.4-8.06

96% of nominal energy is usable.

Spec sheet, at p.1 / Flexible capacity combinations, retrieved Sep 25, 2026 Not yet checked

Sigenergy SigenStor BAT 8.0 Recall: ACCC Nov 19, 2025

96% of nominal energy is usable.

Spec sheet, at p1, Performance Specification, retrieved Sep 23, 2026, dated Nov 12, 2025 Not yet checked

Sigenergy SigenStor BAT 5.0 Recall: ACCC Nov 19, 2025

96% of nominal energy is usable.

Spec sheet, at p1, Performance Specification, retrieved Sep 23, 2026, dated Nov 12, 2025 Not yet checked

Tesla Powerwall 2 Recalls: CPSC Nov 13, 2025 and ACCC Sep 16, 2025

96% of nominal energy is usable.

Spec sheet, at p.1 / PERFORMANCE SPECIFICATIONS, retrieved Sep 23, 2026, dated Jul 2, 2024 Not yet checked

Enphase IQ Battery 10 (ENCHARGE-10-1P-NA)

96% of nominal energy is usable.

Spec sheet, at p.2 / BATTERY, retrieved Sep 25, 2026, dated Mar 21, 2024Usable capacity 10.08 kWh, Total capacity 10.5 kWh

Enphase IQ Battery 10T (ENCHARGE-10T-1P-NA)

96% of nominal energy is usable.

Spec sheet, at p.2 / BATTERY, retrieved Sep 25, 2026, dated Apr 9, 2024 Not yet checked

Enphase IQ Battery 3 (ENCHARGE-3-1P-NA)

96% of nominal energy is usable.

Spec sheet, at p.2 / BATTERY, retrieved Sep 25, 2026, dated Mar 21, 2024 Not yet checked

Enphase IQ Battery 3T (ENCHARGE-3T-1P-NA)

96% of nominal energy is usable.

Spec sheet, at p.2 / BATTERY, retrieved Sep 25, 2026, dated Apr 9, 2024 Not yet checked

Duracell Power Center 5kW (Essential, D-5kW + D-14kWh-LFP)

95% of nominal energy is usable.

Spec sheet, at DC Energy Storage Ratings / DC capacity (usable), retrieved Sep 25, 2026, dated Sep 21, 2023 page cited, no quote

AlphaESS SMILE-G3-BAT-10.1P

95% of nominal energy is usable.

Spec sheet, at p2 / Battery Technical Specifications, retrieved Sep 23, 2026, dated May 22, 2024Usable Capacity | 9.6 kWh, Nominal Capacity | 10.1 kWh

Pylontech US5000

95% of nominal energy is usable.

Spec sheet, at p1, US Series table, retrieved Sep 23, 2026 Not yet checked

Qcells Q.HOME CORE G3 A7.6B13.1 (1 cabinet)

94% of nominal energy is usable.

Spec sheet, at p.2 Battery Unit (DC) / Battery Usable Energy, p.2 Battery Unit (DC) / Battery Total Energy, retrieved Sep 25, 2026 Not yet checked

Qcells Q.HOME CORE G3 A7.6B13.1 (2 cabinets)

94% of nominal energy is usable.

Spec sheet, at p.2 Battery Unit (DC) / Battery Usable Energy, p.2 Battery Unit (DC) / Battery Total Energy, retrieved Sep 25, 2026 Not yet checked

SolarEdge Nexis Battery System (North America), 1 Battery Block

94% of nominal energy is usable.

Spec sheet, at p.2 / ELECTRICAL SPECIFICATIONS, retrieved Sep 25, 2026, dated Sep 2, 2025 Not yet checked

SolarEdge Nexis Battery System (North America), 2 Battery Blocks

94% of nominal energy is usable.

Spec sheet, at p.2 / ELECTRICAL SPECIFICATIONS, retrieved Sep 25, 2026, dated Sep 2, 2025 Not yet checked

SolarEdge Nexis Battery System (North America), 4 Battery Blocks

94% of nominal energy is usable.

Spec sheet, at p.2 / ELECTRICAL SPECIFICATIONS, retrieved Sep 25, 2026, dated Sep 2, 2025 Not yet checked

SolarEdge Nexis Battery System (North America), 3 Battery Blocks

94% of nominal energy is usable.

Spec sheet, at p.2 / ELECTRICAL SPECIFICATIONS, retrieved Sep 25, 2026, dated Sep 2, 2025 Not yet checked

EcoFlow PowerOcean Single-phase

94% of nominal energy is usable.

Spec sheet, at p1 / Performance, retrieved Sep 23, 2026, dated Oct 10, 2025 Not yet checked

SunPower SunVault 13

92% of nominal energy is usable.

Spec sheet, at p.1 Performance / Max. Usable Energy (DC), p.1 Performance / DC Rated Energy, retrieved Sep 25, 2026 Not yet checked

SunPower SunVault 26

92% of nominal energy is usable.

Spec sheet, at p.1 Performance / Max. Usable Energy (DC), p.1 Performance / DC Rated Energy, retrieved Sep 25, 2026 Not yet checked

LG ESS Home 8

91% of nominal energy is usable.

Manual, at p.46 / Home 5/8 - General Specifications, retrieved Sep 25, 2026, dated Jun 28, 2024 Not yet checked

sonnenBatterie 10/11

90% of nominal energy is usable.

Spec sheet, at p1, Technische Daten, retrieved Sep 23, 2026Nutzbare Batteriekapazität in kWh 5 10 20, Nominale Batteriekapazität in kWh 5,5 11 22

Tigo EI Battery TSB-10-US (10 kWh)

90% of nominal energy is usable.

Spec sheet, at p.1 Features, p.2 System Data / Battery Capacity, retrieved Sep 25, 2026, dated Apr 1, 20229.9 kWh per enclosure - usable capacity 9.0kWh, Battery Capacity 9.9kWh 19.8kWh

GSL Energy GBP2 wall battery, GSL051280A-B-GBP2

90% of nominal energy is usable.

Web page, at Product Detail / Usable Energy (kWh), Product Detail / Energy (kWh), retrieved Sep 25, 2026Usable Energy (kWh) 12.91, Energy (kWh) 14.34

Panasonic EverVolt 2.0 EV-X10 / EVHB-I7-X10 (10 kWh)

90% of nominal energy is usable.

Spec sheet, at p.3 Battery specifications, retrieved Sep 25, 2026 Not yet checked

Panasonic EverVolt 2.0 EV-X15 / EVHB-I7-X15 (15 kWh)

90% of nominal energy is usable.

Spec sheet, at p.3 Battery specifications, retrieved Sep 25, 2026 Not yet checked

Panasonic EverVolt 2.0 EV-X20 / EVHB-I7-X20 (20 kWh)

90% of nominal energy is usable.

Spec sheet, at p.3 Battery specifications, retrieved Sep 25, 2026 Not yet checked

Qcells Q.SAVE 10 kWh

90% of nominal energy is usable.

Spec sheet, at p.3 Q.SAVE / Nominal Character / Usable energy, p.3 Q.SAVE / Nominal Character / Total energy, retrieved Sep 25, 2026 Not yet checked

Qcells Q.SAVE 15 kWh

90% of nominal energy is usable.

Spec sheet, at p.3 Q.SAVE / Nominal Character / Usable energy, p.3 Q.SAVE / Nominal Character / Total energy, retrieved Sep 25, 2026 Not yet checked

Qcells Q.SAVE 20 kWh

90% of nominal energy is usable.

Spec sheet, at p.3 Q.SAVE / Nominal Character / Usable energy, p.3 Q.SAVE / Nominal Character / Total energy, retrieved Sep 25, 2026 Not yet checked

Deye RW-F10.2-B

89% of nominal energy is usable.

Manual, at §2.4 Technical Data, retrieved Sep 25, 2026, dated Sep 18, 2025 Not yet checked

EG4 WallMount 314Ah All Weather (16 kWh)

80% of nominal energy is usable.

Spec sheet, at p.2 / Electrical characteristics, retrieved Sep 25, 2026 Not yet checked

EG4 WallMount 314Ah Indoor (16 kWh)

80% of nominal energy is usable.

Spec sheet, at p.2 / Electrical characteristics, retrieved Sep 25, 2026 Not yet checked

Limits

Makers define both nominal and usable energy differently, so shares from different makers do not rest on one basis.

How these figures are compared