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Batteries for photovoltaic systems: are they really worth it? (simple calculation in 2 minutes)

Batteries for photovoltaic systems: are they really worth it? (simple calculation in 2 minutes)

by Technical Department Heiwit | Feb 17, 2026 | Sodium ion batteries, Photovoltaic systems

Batteries for photovoltaic systems: are they really worth it? (simple calculation in 2 minutes) “They cost twice as much... the normal ones are already not cheap, let alone these.” This is a comment one often reads. And it is understandable: a battery is a major expense, and if you look...
Sodium safer than lithium? What the research says (and why “safety” is not one)

Sodium safer than lithium? What the research says (and why “safety” is not one)

by Technical Department Heiwit | Feb 15, 2026 | Insights, Sodium ion batteries

The safety certifications for our systems are listed on the sodium-ion battery range page. Is sodium safer than lithium? What the research says (and why “safety” isn’t a one-size-fits-all concept) When it comes to energy storage for solar power, the question...
HEIWIT sodium ion batteries: field results to date (06/02/2026)

HEIWIT sodium ion batteries: field results to date (06/02/2026)

by Technical Department Heiwit | Feb 6, 2026 | Sodium ion batteries, Press review

Update of 17 September 2026. The 1,000 cycles in this article were the overall total of the Heiwit battery fleet at the time of publication, not the cycles of a single battery. As at 17 September 2026, the fleet had accumulated 31,972 cycles in total....
Sodium batteries: why stratified oxides are changing domestic storage

Sodium batteries: why stratified oxides are changing domestic storage

by Technical Department Heiwit | Jan 28, 2026 | Sodium ion batteries

When “sodium” is not enough: chemistry makes all the differenceTwo storage systems can claim “sodium-ion battery” and yet behave in opposite ways in the home: one holds up well during heat pump peaks, the other collapses in power in the evenings...
Why does the charge percentage (SoC) sometimes “jump”? A simple (but technical) guide to understand it

Why does the charge percentage (SoC) sometimes “jump”? A simple (but technical) guide to understand it

by Technical Department Heiwit | Jan 28, 2026 | Guides, Footer Guides

The behaviour described applies to systems in the Heiwit sodium-ion battery range. Why does the state of charge (SoC) sometimes “jump”? (This also happens with lithium batteries, particularly LFP ones.) If you have a home battery connected to a solar panel system, it may happen that...
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