Size and weight of storage batteries: the comparison to scale

Size and weight of storage batteries: the comparison to scale

A sodium-ion battery is not a huge cabinet. Drawn at the same scale, with the dimensions declared by the manufacturers, Heiwit batteries sit in the same size and weight range as residential lithium batteries of 10 to 13.5 kWh. The Heiwit 10 kWh battery measures 465 × 268 × 918 mm and weighs less than 116 kg.

“Sodium is a new technology, so it must be big and heavy.” It is a doubt we hear often, from installers and from people who have to find room in the garage.

To answer it, we drew eight home storage batteries at the same scale: real width, height and depth, with the weight alongside.

The comparison

Click the image to see it at full resolution. Viewed from 30° to the side and 15° from above, all models at the same scale.

The dimensions, model by model

Dimensions and weights as declared by the manufacturers. Sources at the end of the article.

What the numbers say

• Weight is average. Batteries of around 10 kWh weigh between 90 and 148 kg. The Heiwit 10 kWh, under 116 kg, sits in the middle.
• Size is average. In height, the Heiwit 10 kWh, at 918 mm, is lower than Tesla and Solis and slightly taller than Huawei. In depth, at 268 mm, it is thicker than the slimmest wall-mounted models.
• The 7.78 kWh arrives in three parts. 120 kg in total, split into three modules that are easier to handle.

The space that really matters

A battery’s footprint is not measured only in millimetres. Where it can go also matters.

The Heiwit sodium battery operates from -25 to +60 °C without climate control. That is why it can go in a garage, cellar or loft, the spaces in a house that usually serve no other purpose.

Outdoors it needs protection: the battery is IP20 and outside it is installed in an IP65 cabinet, in the shade and ventilated.

Frequently asked questions

Are sodium batteries heavier than lithium ones?

Not in the residential range. Comparing manufacturers’ datasheets, batteries of around 10 kWh weigh between 90 and 148 kg; the Heiwit 10 kWh sodium-ion battery weighs less than 116 kg.

Where can a Heiwit battery be installed?

Indoors, in a garage, cellar or loft, thanks to its operating range of -25 to +60 °C. Outdoors only in an IP65 cabinet, in the shade.

Are the dimensions comparable with each other?

They are the ones declared by each manufacturer. For modular systems, the complete configuration given in the datasheet is used, with battery modules and power module or BMS. Tesla Powerwall 3 also integrates the inverter.

Sources: [1] Heiwit, NA-48V210Ah battery datasheet (ITA), document archive installatori.heiwit.com. [2] Heiwit, NA-48V160Ah technical data, vertical and horizontal versions, September 2026. [3] Huawei, LUNA2000-5/7/10/12/14/15/17/19/21-S1 datasheet, version 01-202509, solar.huawei.com. [4] Deye, RW-F10.2 Series Brochure 20250213V1.0 and 20251119V1.0, deye.com (dimensions without mounting bracket). [5] Tesla, Powerwall 3 datasheet (IT), 2026, energylibrary.tesla.com (integrated hybrid inverter). [6] Solis (SolisStorage), IntelliHome RESS Global Flyer V1.5, September 2026, solisstorage.com. [7] Afore, Wall Mounted AF10000W-LG datasheet, 2024, aforenergy.com (dimensions given as 800 × 590 × 142 with no indication of axes). Heiwit analysis, September 2026. The trademarks mentioned belong to their respective owners.

All specifications on the product page of the 10 kWh Heiwit sodium-ion battery, stackable up to three units per inverter.