Battery Storage Calculator
Calculate the recommended size for your battery storage – tailored to your PV system, electricity consumption and usage behavior.
How the Calculation Works
The battery storage calculator determines the optimal storage capacity based on several factors:
Basic Calculation
The base capacity is determined from two rules of thumb:
- 1 kWh per 1,000 kWh annual consumption - The more you consume, the more storage is worthwhile
- 1 kWh per kWp PV capacity - Storage size should match system size
Adjustment Factors
The following factors influence the recommended storage size:
| Factor | Influence |
|---|---|
| Evening usage | +20% capacity |
| Daytime usage | -20% capacity |
| EV charging | +50% of daily charge amount |
| Heat pump | +2 kWh base addition |
| Home office | -15% (more direct consumption) |
| Backup power | +30% reserve |
Typical Recommendations
| Household Size | PV System | Recommended Storage |
|---|---|---|
| 2-3 persons | 5-7 kWp | 5-8 kWh |
| 4-5 persons | 8-10 kWp | 8-12 kWh |
| With EV | 10+ kWp | 12-15 kWh |
| With heat pump | 10+ kWp | 10-15 kWh |
Example: A 4-person household with an 8 kWp PV system and 5,000 kWh annual consumption typically needs an 8-10 kWh storage.
Further Information
Embed Calculator on Your Website
Would you like to embed this battery storage calculator on your own website? Simply add the following code to your HTML source:
<!-- Battery Storage Calculator by PV-Calor -->
<ge-mini-solarspeicher lang="en"></ge-mini-solarspeicher>
<script src="https://www.pv-calor.com/user/plugins/gecomponents/assets/ge-mini-solarspeicher.embed.js"></script>Available languages: Change lang="en" to one of the following languages: de, en, fr, it, es, pt, nl, da, sv, pl, ru
Embedding is free of charge. Contact us if you have any questions.