Drop one or more CSV files here or browse
Supports Solar Manager and Home Assistant energy exports · Multiple files are merged automatically
| Battery Size | Self-Sufficiency | Self-Consumption | Grid Savings | Annual Savings |
|---|
How is the recommendation calculated?
Each battery size is simulated over the selected dataset. For every 5-minute interval the calculator charges the battery from surplus solar, discharges it to cover consumption, and tracks grid import/export — applying the configured round-trip efficiency.
The recommended size is the smallest battery where each additional kWh yields less than 3 percentage points of extra self-sufficiency. Beyond that threshold the curve flattens and the marginal benefit no longer justifies the extra capacity.
Annual savings are calculated as:(reduced grid import × electricity price) − (lost feed-in export × feed-in tariff)
and are scaled to a full year if the dataset covers less than 365 days.