Question 1

What is a sodium-ion battery?

Accepted Answer

A battery that uses sodium ions (Na⁺) instead of lithium ions to carry charge between a cathode and anode through an electrolyte, operating on the same "rocking-chair" principle as lithium-ion but with a bulkier ion.

Question 2

Can sodium-ion batteries replace lithium-ion batteries?

Accepted Answer

Not universally. Lithium-ion remains preferred where compactness and weight are critical, such as EVs. For stationary home storage, sodium-ion is a genuine, increasingly commercial alternative rather than a wholesale replacement.

Question 3

Are sodium-ion batteries good for solar power storage?

Accepted Answer

Yes. Sodium-ion is particularly well suited to stationary solar storage because a home battery does not face the same weight and space constraints as an EV. Its suitability still depends on the system's cost, efficiency, operating temperature, warranty and installation requirements.

Question 4

How long does a sodium-ion home battery last?

Accepted Answer

Eleven Energy's Galvani carries a 10-year, 8,000-cycle warranty. Separate reported testing found cells retaining about 85% capacity after roughly 13,000 cycles — strong, but a lab finding, not a guaranteed lifespan.

Question 5

Is sodium-ion safer than lithium-ion?

Accepted Answer

Both can be engineered to high safety standards. LFP lithium-ion has a strong safety record; sodium-ion is reported to offer additional intrinsic margins. Overall safety still depends on the BMS, thermal design and installation quality.

Question 6

What is the Eleven Energy sodium-ion home battery?

Accepted Answer

The Galvani system: modular sodium-ion battery packs with a 4.5 kWh nominal capacity each, stacking up to 16 modules per inverter, paired with Eleven Energy's hybrid inverters and an app for smart, tariff-aware energy management.

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