Solar electricity · Understand quotes
Compare PV quotes
Two quotes, two prices – but do they include the same things? Compare the purchase cost and scope of supply. Missing information becomes specific questions to ask.
You need two PV purchase quotes showing capacity, package price and scope of supply. Without documents, you can try the clearly labelled fictional example.
Quote A + Quote B
What does the PV price actually include?
Two purchase quotes, the same task: record package prices and check additional costs. Open items become specific questions for your installer.
Calculations run in your browser. Entries are not sent to the website. Only when you choose “Add to my plan” is a snapshot kept in this browser tab. You can export or clear it in the planning sheet.
Method and limitations
Recorded purchase cost = quoted total + confirmed additional costs not already included. An included service or allocated package component is not added again. Missing details produce a subtotal.
Use prices including applicable taxes and before financial support is deducted. The calculator does not calculate tax or grant eligibility and does not deduct grants. Inputs are initially blank. Only an explicitly entered zero counts as €0.
State explicitly whether you have a specific quoted price for your project or only a starting or indicative price. With starting or indicative prices, totals remain non-binding starting points; neither a price ranking nor euros per kWp are shown. Also clarify price validity and regional availability.
A price difference is shown only once details are clear, PV capacity matches and the scope is comparable. You confirm technical equivalence yourself after reviewing the quotes. A lower amount is not a quality rating or a recommendation to buy.
Euros per kWp is shown only when costs are fully recorded and explicitly limited to the PV system, without a battery or additional packages. This figure accounts for neither quality nor generation. No arbitrary partial amounts are subtracted from package prices.
The comparison covers the purchase. Generation, self-consumption, returns, financing, recurring costs, replacements and residual values are excluded. Shared use, rental/lease and electricity supply contracts need additional checks. The service list is a preparation tool, not a guarantee that all building work has been recorded.
Euro inputs have no more than two decimal places. The calculation adds amounts in cents; euros per kWp is rounded to two decimal places for display.
From the price to your next question
What does the comparison tell you – and what remains open?
Why does it say “subtotal”?
Unresolved items may change the price. The calculator adds only confirmed amounts. It shows a direct price difference only when all recorded details are clear and both quotes cover the same task.
Can I use advertised package prices?
Yes, as a starting point for your questions. Select “Starting price or general indicative price”. An online advert is not yet a specific quote for your roof. Clarify the service area, price validity, conditions and complete scope with the supplier. While these details are missing or only an indicative price is available, the calculator shows neither a direct price difference nor a comparable price per kWp.
What can the price tell me about quality?
The calculator does not award a quality rating. Compare components, system design, warranties and payment terms with a qualified adviser. Equal kWp does not automatically mean equal yield or equivalent services.
Where can I check generation and self-supply?
This calculator compares the purchase. For a detached house, you can also explore energy flows between PV, battery storage, a heat pump and an electric car in HTW Berlin’s Solarisator. This external model does not replace a specific roof design.
I am planning a shared solar roof or a rental model.
Shared use and electricity supply contracts require additional cost and contract checks. Use our guide to apartment buildings and clarify the model with specialist advice. This simple purchase comparison does not treat such cases as equivalent.
Technical guidance and status
Consumer advice centre: planning PV and checking quotes. The inputs and calculation logic were developed by EnergyCheckUlm.
Calculator status: 28 September 2026. The example uses fictional amounts and does not show market prices. The approach was also checked using two publicly advertised package prices. This does not replace specific quotes for the same building or a professional review of their scope.
Bring specific questions to your specialist discussion.
Take the report with you. Ask both suppliers to clarify missing work, price components and differences in writing.