A photovoltaic roof can operate automatically for most of the time, but it does not relieve the owner of observation and planned maintenance. Both the covering and the electrical installation need care. This does not mean constantly going onto the roof or frequent washing. A sensible plan is based on instructions, environmental conditions and specific signals. This makes servicing predictable instead of appearing only when there is a leak or a fault. After proper commissioning, the inverter and other devices control the normal operation of the installation. The owner does not have to switch on production every morning or adjust connections to the weather. Monitoring can automatically record data and signal certain events.

In a passive house, the roof helps limit space heating demand when its insulation meets the wall insulation and the airtight layer continues around the eaves, windows and service penetrations. Heat losses at these junctions count towards the energy balance of the whole building, alongside glazing, ventilation and building shape. When reviewing the roof design, look at drawings of each junction and how the work will be checked on site. Insulation thickness alone tells you little about the energy the house will need. Photovoltaic panels generate electricity, while heat losses depend on the building fabric and air exchange.