The Renewables Blog

From bill to profit: +€81 in 30 days with HEIWIT ⚡

25 April 2026 | Insights, Sodium ion batteries

From bill to profit: +€81 in 30 days with HEIWIT ⚡

Yes, you read that correctly.
In the last 31 days, one of our plants not only They haven't paid the electricity bill
but earned €81.66.


? The real numbers (not simulations)

  • Total consumption: 348.4 kWh
  • Photovoltaic production 1244.4 kWh
  • Battery 10 kWh (HEIWIT sodium-ion)
  • Period 31 days

How much would you have spent without HEIWIT?

With a traditional system, without photovoltaics:

  • Energy expenditure 114,57 €
  • Annual forecast 1.348,97 €

Full bill, every month.


☀️ Solar PV: already better, but not enough

  • Spending period: -34,85 €
  • Energy sold 1,082.0 kWh
  • Debt collection 101,20 €
  • Savings vs. Network 149,42 €

Yes, you start earning... but you're giving energy at the net at the wrong times.


? Photovoltaics + HEIWIT battery

  • Spending period: -61,65 €
  • Online shopping 38.5 kWh
  • Sale 864.3 kWh
  • Debt collection 74,95 €

The sodium-ion battery improves everything:
✔ more self-consumption
✔ less waste
✔ more independence


AI CARE – OPTIMISED SELF-CONSUMPTION

And this is where the magic happens.

  • Spending period: -81,66 €
  • Online shopping 12.2 kWh
  • Sale 890.7 kWh
  • Debt collection 85,95 €

? +€81.66 net in 30 days

Compared to the standard battery:
€20.01 more thanks to intelligent optimisation.


? Why does AI CARE make a difference?

Our software AI CARE It doesn't just store energy.
Decide when to use it, when to sell it, and when to keep it.

  • Seize the best moments to sell energy
  • Optimise battery charge/discharge
  • ?️ Integrate weather forecasts and consumption
  • minimises bought energy

Result?
Your plant stops being a cost… and becomes an active asset.


The future of energy is this

It's not just about saving money.
It's about Earning from your own energy.

HEIWIT + Sodium + AI CARE
= total control + maximum performance


Want to see what it can do for your system?
Contact us and discover your potential.