EP Cube 2.0 Battery Review: Specs, Warranty and Sizing

The EP Cube battery is now sold in the US as EP Cube 2.0, a hybrid inverter and stack of 5 kWh LFP modules that runs from 5 to 40 kWh in one unit and supplies up to 11.5 kW. Canadian Solar presented updated EP Cube 2.0 systems in July 2026, and CSI Solar published the current North America datasheet (V1.6) in August 2026. This review uses that datasheet and EP Cube’s US product page for every spec. We haven’t tested one ourselves.

Who Makes EP Cube?

The datasheet lists CSI SOLAR (USA) Co., Ltd. of Walnut Creek, California, as the US contact and says EP Cube is designed and manufactured by Eternalplanet. EP Cube describes itself as an independent residential storage brand under Canadian Solar, which is why the system is often called the Canadian Solar EP Cube.

What Changed in EP Cube 2.0

The first-generation EP Cube used about 3.3 kWh modules, three to six per unit (9.9 to 19.9 kWh), with a 7.6 kW inverter. EP Cube 2.0 changes the building blocks:

5 kWh modules, one to eight per unit, for 5 to 40 kWh.
11.5 kW maximum continuous output, up from 7.6 kW.
Six MPPTs for solar, up from four.
Up to 185 A of locked-rotor current (LRA) for one second, for motor starts.
A new Smart Gateway rated at 200 A, with seamless on- and off-grid switching.

In July 2026, pv magazine reported that Canadian Solar launched upgraded EP Cube Single-Phase 2.0 and Three-Phase Pro systems. US homes use the split-phase 120/240 V version covered here.

EP Cube 2.0 Battery Specs

EP Cube 2.0. Image: CSI Solar (Canadian Solar), EP Cube 2.0 datasheet.

Spec	5 kWh	10 kWh	15 kWh	20 kWh
Battery modules	1	2	3	4
Battery-only continuous discharge (240 V)	3 kW	7.6 kW	11.5 kW	11.5 kW
Battery-only continuous charge (240 V)	2.5 kW	5 kW	7.5 kW	10 kW
Height (23.6 in wide, 8.7 in deep)	36.9 in	47.4 in	58.0 in	68.5 in
System weight	195 lb	290 lb	385 lb	479 lb

Source: EP Cube 2.0 Datasheet NA English V1.6 (August 2026). With solar running, every size can supply 11.5 kW at 240 V.

Sizes from 25 to 40 kWh (five to eight modules) sit on a long base, 53.2 in wide, and are floor-mounted only. They supply 11.5 kW from the battery alone and weigh 595 to 879 lb.

Shared spec	Value
Hybrid inverter	6 MPPTs; 60–550 V DC PV input; 5 kW max per MPPT
AC output	120/240 V or 120/208 V, 60 Hz; 240 V output set at 5.8, 7.6, 9.6 or 11.5 kW
Split-phase imbalance	100%, up to 5.75 kW per phase
Inverter CEC efficiency	96.5%
Chemistry	Lithium iron phosphate (LFP); each module 95 lb
Enclosure	NEMA 4X; 30 dB(A) at night, under 60 dB(A) max
Mounting	Floor or wall (up to 20 kWh)
Operating temperature	Charge 14 to 122 °F; discharge −4 to 122 °F (may derate at extremes)
Safety	AFCI and PV rapid shutdown; UL 9540, UL 9540A, UL 1741-SB
Listings	CEC, HECO, SGIP, LUMA
Warranty	Over 80% capacity, up to 10 years or 6,000 cycles

The Smart Gateway

EP Cube 2.0 uses the optional SGNA2-200GX Smart Gateway: 200 A max current, a 125 A non-backup port, seamless switchover, a 2-wire generator start, RS485 communication for EV chargers and support for up to five smart breakers, per the datasheet. It’s NEMA 3R, rated from −40 to 122 °F, and carries a 10-year warranty. EP Cube says the system can connect to two 40 A Level 2 EV chargers.

What the Specs Mean

Battery size sets no-sun power. One module gives only 3 kW from the battery alone. You need three modules (15 kWh) to reach the full 11.5 kW at night.
Total energy, not usable. The datasheet lists total energy. Ask your installer for usable capacity at your reserve setting.
Big solar input. Six MPPTs at up to 5 kW each, and EP Cube’s page lists up to 24 kW of PV input. Existing solar can also be AC-coupled.
Heavy-load starts. 185 A LRA for one second helps with central air conditioners and well pumps.

Scaling Up

EP Cube’s US page says up to three units can run in parallel for 120 kWh and 34.5 kW of output. The datasheet lists 5 to 40 kWh per unit and up to 120 kWh for a full system.

How It Compares to Powerwall 3, Enphase 5P and FranklinWH

Spec	EP Cube 2.0 (20 kWh)	Tesla Powerwall 3	Enphase IQ Battery 5P	FranklinWH aPower 2
Energy	20 kWh (total)	13.5 kWh (usable)	5.0 kWh (usable)	15 kWh (usable)
Continuous power	11.5 kW	Up to 11.5 kW	3.84 kVA	10 kW
Coupling	Hybrid (DC and AC PV)	DC solar input built in	AC-coupled	AC-coupled
Chemistry	LFP	LFP	LFP	LFP
Warranty	>80%, 10 yr or 6,000 cycles	10 yr, 70% (US)	15 yr or 6,000 cycles	15 yr or 60 MWh

Figures from each maker’s US documents. EP Cube lists total energy; the others list usable energy.

Versus Powerwall 3: both are hybrid systems with up to 11.5 kW. EP Cube 2.0 can hold far more energy in one unit. See our Tesla Powerwall 3 review.
Versus Enphase 5P: both scale in 5 kWh steps, but Enphase is AC-coupled with microinverters.
Versus FranklinWH aPower 2: FranklinWH has a longer term, while EP Cube guarantees a higher end capacity (over 80%). See Powerwall 3 vs Enphase vs FranklinWH.

Who It Suits

Homes adding new solar and storage together that want one stack with a large solar input.
Homes that want to start small and grow in 5 kWh steps.
Owners planning EV charging or generator integration through the gateway.

Who Should Look Elsewhere

Homes that want full 11.5 kW backup at night but only budget for one or two modules.
Buyers who want usable-capacity figures on the datasheet itself.

Sizing Example

Illustrative inputs: a home uses 13 kWh overnight with a 7 kW evening peak and no solar after dark.

Power with battery only: 7 kW rules out one module (3 kW). Two modules (7.6 kW) cover it.
Energy: if your installer confirms about 90% of total energy is usable (illustrative), 10 kWh gives about 9 kWh, which falls short. Three modules (15 kWh, about 13.5 kWh usable) cover 13 kWh.
Headroom: a fourth module (20 kWh) adds margin for heat waves or longer outages.
Daytime: with solar running, any size can supply 11.5 kW.

See how many batteries to power a house.

Questions to Ask an EP Cube Installer

How many 5 kWh modules, and what’s the usable capacity at my reserve setting?
What output setting (5.8, 7.6, 9.6 or 11.5 kW) will the inverter use, and what breaker size?
Is my solar DC-connected to the inverter or AC-coupled?
Is the Smart Gateway included, and which loads will it back up?

Price and Incentives

EP Cube is sold through installers. We aren’t publishing a price we can’t verify. There’s no 30% federal credit for homeowner-owned systems installed after December 31, 2025 (IRS).

Electrical work can be dangerous: follow the manual, fuse and size every cable correctly, and use a licensed electrician for anything connected to household wiring.

FAQ

How much does an EP Cube 2.0 battery store?

5 to 40 kWh of total energy per unit, in 5 kWh modules. Up to three units can reach 120 kWh.

How much power can EP Cube 2.0 supply?

Up to 11.5 kW continuous at 240 V with solar, and 3 kW, 7.6 kW or 11.5 kW from the battery alone with one, two, or three or more modules.

What is the EP Cube 2.0 warranty?

Over 80% capacity for up to 10 years or 6,000 cycles, whichever comes first. The Smart Gateway has a 10-year warranty.

Is EP Cube 2.0 different from the original EP Cube?

Yes. It uses 5 kWh modules instead of about 3.3 kWh, a larger 11.5 kW inverter with six MPPTs, and a new 200 A Smart Gateway.

Is EP Cube made by Canadian Solar?

It’s sold in the US by CSI Solar (USA), part of Canadian Solar, and designed and manufactured by Eternalplanet, per the datasheet.

Sources: CSI Solar, EP Cube 2.0 Datasheet NA English V1.6 (Aug 2026) and EP Cube Datasheet NA English V2.8 (Mar 2025, first generation); EP Cube 2.0 US product page (epcube.com); EP Cube, Intersolar Europe 2026 news release (June 2026); pv magazine USA, “Canadian Solar unveils new EP Cube systems” (July 10, 2026); Tesla Powerwall 3 Datasheet; Enphase IQ Battery 5P datasheet; FranklinWH aPower 2 datasheet; IRS, Residential Clean Energy Credit. Accessed Oct 2026.