Solar PV system planning
Clarify roof duties, grid and register steps, subsidy context, and provider contact before you request an installation quote.
Updated: May 21, 2026 · Updated
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Start with the decision path
The first question is not the provider name. Clarify which rule, subsidy, or application step changes the project before you compare offers.
Core duties
For rooftop PV, the practical path usually separates grid registration, federal register entry, metering, and tax handling.
| Step | What to clarify |
|---|---|
| Grid operator | Register every system before grid connection. |
| MaStR | Enter the system in the Marktstammdatenregister. |
| Smart meter | Relevant for many systems from 2 to 100 kWp. |
| Tax | Annual tax handling can become relevant above 30 kWp. |
Solar duties differ by state
New buildings, roof renovations, commercial buildings, and residential buildings can follow different state rules. Check the state rule before treating a quote as complete.
Registration path
A rooftop PV system normally needs grid-operator registration and a Marktstammdatenregister entry. Larger systems can add smart-meter and tax steps.
Subsidy context
State and municipal programs change frequently. Separate federal feed-in rules, state support, storage funding, and local utility programs before comparing offers.
Provider contacts
Use the provider directory after the scope is clear enough to compare contact options by topic and location.