Battery storage costs per kWh

Battery storage costs per kWh – interactive calculator & comparison

A battery storage system is only worthwhile if the cost per stored kilowatt-hour (kWh) is proportionate to the electricity price and feed-in tariff. With our free battery storage calculator , you can easily and transparently calculate the actual cost per kWh of your battery storage system – and whether the investment will truly pay off in the long run.

🔋 What does “battery storage costs per kWh” mean?

The term describes how expensive a stored kilowatt hour of electricity is in relation to the acquisition cost, number of cycles, depth of discharge and efficiency of the storage system.

In short: The lower the value in €/kWh , the more economical your electricity storage system.

For example:
A 10 kWh battery storage with an acquisition cost of €6.000, a depth of discharge of 90%, an efficiency of 92% and 4.000 cycles results in:

Storage costs per kWh ≈ €0,18/kWh

This means the price is significantly lower than the current electricity price – a clear advantage!

💰 Why are the costs per kWh so important?

This metric indicates whether a storage system operates economically . It takes into account not only the investment, but also the technical lifespan and efficiency.

Battery storage costs per kWh → central comparison value
Electricity storage costs per kWh → overall economic efficiency over the lifetime
Costs of PV storage per kWh → ideal for photovoltaic systems with self-consumption
Costs of PV system with storage per kWp → Combination of PV and storage costs

These values allow you to objectively compare different systems – regardless of whether they are lithium-ion, LFP or saltwater storage systems.

⚙️ Our free battery storage calculator

With the interactive tool you can calculate:

Total costs less funding
Usable capacity (taking DoD & efficiency into account)
Expected number of cycles over the lifetime
Cost per stored kWh (LCOE)
Payback time in years
Conclusion traffic light: Is your storage worth it?

🢢 Worth it (of course) – If the calculated value is below your electricity price
🟡 Borderline case – When costs and benefits almost balance each other out
🔴 Not worth it – If the costs are higher than your electricity price

📊 Exemplary guidelines

Memory size	Price	Price per kWh	Lifespan	assessment
5 kWh	3.500 €	700 € / kWh	10 years	Borderline case
10 kWh	5.800 €	580 € / kWh	12 years	It's worth it
15 kWh	8.500 €	566 € / kWh	15 years	Definitely worth it

These values depend heavily on your electricity consumption, PV generation, and electricity prices.

☀️ Connection to your PV system

A PV storage costs per kWh Comparison shows that larger storage units (10–15 kWh) are usually cheaper per kWh.
The combination is important:

PV system with storage per kWp = Total cost of PV + storage ÷ installed capacity.

This is how you can recognize the true overall benefit of your photovoltaic system with electricity storage.

🧾 Conclusion – Is a power storage system really worth it?

Whether a battery storage system is worthwhile depends on three crucial factors :

Cost per kWh your storage
Difference between electricity price and feed-in tariff
Utilization rate & cycles per year

In most cases, a power storage system is worthwhile from about €0,15 – €0,20/kWh – especially with high self-consumption or rising electricity prices.

Our calculator instantly shows you whether or not your storage system is economically viable . Test different scenarios and find out how you can save on electricity costs in the long run with a battery storage system.