Frequently Asked Questions
How many panels do I need for a detached house?
The design is based on consumption and the intended use of electricity in the home. A household with average consumption usually requires 10 to 16 panels, whereas a house with a heat pump or an electric vehicle needs more. The exact number is determined by analysing utility bills and surveying the roof, which is why we start there.
Are batteries worth it, or are panels enough?
Without a battery you will use only part of the generation directly, as the sun shines at midday while households consume in the morning and evening. A battery bridges this gap. From June 2026, storage is also a condition for support under Nová zelená úsporám. We design the ratio of panels to battery based on your consumption curve, not on a standard set.
How long does the process take from inquiry to commissioning?
The installation itself usually takes one to three days. The administrative process is longer: the utility network statement regarding the connection request typically arrives within a month, followed by an inspection and replacement of the electricity meter after installation. Overall, allow for several weeks to a few months depending on the distributor's workload in your region.
Do I need building permission?
Solar PV on the roof of a detached house up to 50 kW usually requires no building permit or notification, provided it does not affect the load-bearing structure and the property is not heritage-protected. We will verify any exceptions with the building authority for you before preparing the design.
What if the roof has poor orientation?
South is ideal, but east and west work very well, and spreading the panels on both sides often better matches household consumption throughout the day. North is not recommended. Flat roofs are handled with a tilted mounting structure. We will assess orientation and shading during the inspection.
What to do with surplus electricity that I don't consume?
Surpluses can be sold to an electricity trader or used via a so-called virtual battery, where the supplier credits excess feed-in against consumption. Terms vary depending on the supplier and contract. In our proposal, we will show you how much surplus is realistically generated and whether a physical battery is more cost-effective.