LCOS: the real cost of every kWh a battery returns (with calculator)
Il costo di una batteria non è il prezzo diviso per i kWh scritti sulla targhetta. È il prezzo diviso per tutti i kWh che la batteria restituisce davvero, in tutta la sua vita. Questo numero si chiama LCOS, costo livellato dell’accumulo. Per calcolarlo bastano...
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. Placed on the same scale, using the dimensions stated by the manufacturers, Heiwit batteries fall within the same size and weight range as...
Which battery pays off? The game that shows the real cost of energy storage
Quale batteria conviene? Il gioco che mostra il vero costo di un accumulo Il prezzo di una batteria non dice quanto costa. Quello che conta è il costo di ogni kWh che restituisce in tutta la sua vita: il prezzo diviso per l’energia che eroga davvero. Con quattro...
Heiwit systems: 92% of solar potential used. Real data from hundreds of systems
Impianti Heiwit: il 92% del potenziale solare sfruttato. I dati reali di centinaia di impianti Gli impianti fotovoltaici con batteria Heiwit monitorati da AI-Care sfruttano in media il 92% dell’energia solare che possono usare. Tre impianti su quattro superano...HEIWIT sodium battery with NFPP cells: 9,000 cycles at 95% DoD and 70% residual capacity
Over the past few months, we’ve been telling you how the world of energy storage is changing: the limitations of traditional chemical technologies, the race for critical materials, and the search for safer and more durable solutions. Our last article ended with a question: “And….Energy density versus lifespan: which really matters in stationary storage
When comparing storage technologies, one figure is cited more often than any other: energy density, measured in watt-hours per kilogram. It is the parameter that has driven twenty years of battery development, for one simple reason: batteries have...NFPP sodium-ion cells at low temperatures: 95% capacity at −20 °C in qualification tests
There is a flaw in domestic batteries that the catalogues rarely mention: their performance drops in cold weather. This is no minor detail, because the time when their performance drops is precisely when they are needed most. In January, solar panels produce only a fraction of...Sodium-ion cell safety: what the evidence really says
“Is it safe?” is the first question people ask us, and they’re quite right to do so. A battery isn’t a fuel tank: it’s an electrochemical system that stores energy in chemical form and which, when pushed beyond its limits, can release all that energy at once. The answer...Industrial BESS: duration and safety before density
Imagine an industrial plant that charges and discharges the same battery twice a day for fifteen years. That is thousands of cycles, one after the other, day and night. In such a scenario, the right question is not “how much energy goes into a metre...High-current batteries: how they handle real-world stress
Imagine a winter morning in Northern Italy. The system is covered in frost, the temperature is below zero and you need to charge the storage system quickly to make the most of the first few hours of sun. It is precisely in moments like this that you realise whether a battery is...Battery safety: what happens when they heat up
Imagine a BESS container installed in an industrial area, next to a warehouse where dozens of people work every day. Inside, there are hundreds of cells storing energy. Under normal conditions, everything runs smoothly. But what happens if a cell...
Can the public administration become self-sufficient? Energy, self-consumption and emissions
Producing in a year an amount of energy similar to the annual consumption of a perimeter does not mean making it self-sufficient. To transform the potential of public roofs into truly used energy, hourly profiles, the grid, contracts, storage and rules of...
From potential to operational plan: how to solarise public buildings
The decisive step is not estimating how many panels can fit on roofs, but transforming thousands of surfaces into an orderly pipeline of financeable, permittable and constructible projects. 2027 EPBD threshold for public buildings >2,000 m² 2028 threshold >750 m² 2030 threshold >250...
5.68 GW and 7.53 TWh on public administration roofs: results and significance
The Heiwit model yields 5.68 GWp of theoretical capacity and 7.53 TWh of annual generation. These are large-scale results, but they have not yet been independently replicated. This page presents them with correct equivalences and necessary caveats. 5.68 GWptheoretical power...
How much does it cost to solarise public roofs? CAPEX, LCOE and economic variables
The preliminary economic model states approximately €6.8 billion of investment. The figure is interesting, but it must not be turned into a promise of return until cash flows, price sources and sensitivity analyses are published. €6.8 bn aggregated CAPEX...
Solar PV on public roofs: how much can it contribute to the 2030 NECP?
Italy must rapidly increase photovoltaic capacity by 2030. The roofs of public buildings do not solve the problem on their own, but they can represent a significant share without occupying new land. 79.2 GW NECP 2030 photovoltaic target 37,002...
How we estimated the photovoltaic potential of 41,254 public administration structures
A credible national estimate cannot be born from an average surface area multiplied by the number of properties. The Heiwit model uses a geolocated frame, a stratified sample and solar estimates referred to individual elements. Precisely for this reason the steps not yet...
How storage battery prices really compare
Two batteries with the same list price can end up costing twice as much as each other by the end of their lives. It's not a paradox: that's what happens when you compare the purchase price instead of the cost of the energy that...
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