
Discover how you can save hundreds of euros per year with a home battery and dynamic energy contract by smart charging and discharging.
A home battery is more than just a storage unit for solar power. In combination with a dynamic energy contract, your battery becomes a smart earnings model: charge cheap when electricity costs little, and use your own stored electricity when the price is high.
With a dynamic energy contract (also called an "hourly rate" contract) you pay a different price for electricity every hour. The price follows the wholesale market price (EPEX spot price) and is announced one day in advance.
This means electricity is sometimes very cheap (e.g. at night or on sunny afternoons) and sometimes expensive (e.g. early morning and in the evening during cooking).
The principle is simple and works as follows:
At night the electricity price is lowest (sometimes even negative!). Your battery charges automatically when the price drops below a threshold.
During the breakfast peak hour, electricity is expensive. You now use your stored cheap electricity instead of expensive grid power.
Your solar panels generate electricity. What you don't use directly goes to the battery. With a dynamic contract, afternoon prices are sometimes also low due to high solar supply.
| Period | Arbitrage savings | + Solar panels |
|---|---|---|
| Per day | Per month | Per year |
| Anchor SOLIX X1 | Yes, built-in | Anker app, dynamic control |
| Anker Solarbank series | Yes, via app | Anchor app |
The evening peak is the most expensive time. Your battery now delivers your stored electricity. You save the maximum difference between cheap charging and expensive consumption.
Let's calculate how much you can save with a 5 kWh battery and a dynamic contract.
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Result: With a 5 kWh battery and dynamic contract you save up to ~€780 per year. Combined with VAT reclaim (21%), the investment is paid back in 3-4 years.
Note: This is an optimistic example. Actual savings depend on daily price fluctuations, which vary by season and day. Budget conservatively for €400-€600 per year.
| Total | Battery | Smart control | Compatible apps |
|---|---|---|---|
| Dyness + Solis inverter | Via inverter | SolisCloud, Home Assistant | Pylontech + Solis inverter |
| Via inverter | SolisCloud, Home Assistant | Huawei LUNA2000 | Via FusionSolar |
| FusionSolar app |
Not every battery can automatically charge and discharge based on electricity prices. Here are the options:
Discover how much you can save with a home battery and dynamic contract.
No, not with a home battery. You always charge when electricity is cheap and use your own stored electricity when it's expensive. Without a battery you risk having to buy expensive electricity during peak hours — but with a battery you protect yourself against this.
Yes, some systems support this. You can charge your battery when electricity is cheap and feed it back to the grid when the price is high. This is called "energy arbitrage" and can yield extra returns. Do check whether your energy supplier allows this.
Even without solar panels you save with a dynamic contract and home battery. The price arbitrage (charge cheap, discharge expensive) yields an average of €300-€500 per year, depending on your battery capacity and price fluctuations.
Our energy experts are happy to provide you with personal advice. Free and without obligation.
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Founder & certified energy advisor
Patrick from Home Energy Solutions
Founder & certified energy advisor
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