Free solar calculator

Solar Quote Comparison Calculator

Compare up to three installer quotes using price per watt and warranty length, without sharing your details with a sales company.

Enter your installer quotes

Add system size, total price and warranty for each quote.

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Quote comparison

A like-for-like price check.

Up to 3 quotes
Best value by price per watt
Use price per watt as one comparison point, not the whole decision.
Add at least one complete quote to compare.
Check beyond price: panel and inverter model, scaffolding, monitoring, workmanship warranty, exclusions and installer credentials can materially change value.

Compare solar quotes on the same basis

A lower total price is not automatically a better deal. Normalising each quote by system capacity helps you see where the price difference begins.

1. Enter each quote

Add the system size in kW, total installed price and warranty length.

2. Compare price per watt

Each quote is converted to a price per watt so different system sizes can be compared more fairly.

3. Review what is included

Use the result as a starting point, then compare equipment, exclusions, warranties and installer support.

A simple example

Quote A offers a 4.5 kW system for €7,200. Quote B offers a 4.5 kW system for €6,300 with a shorter warranty.

Quote A: €7,200 ÷ 4,500 W = €1.60/W
Quote B: €6,300 ÷ 4,500 W = €1.40/W

Quote B is cheaper per watt, but the warranty and equipment differences still need to be checked.

Solar quote comparison FAQs

What is a good price per watt for solar panels?

Price per watt varies by market, system size, roof complexity and equipment specification. Comparing several local quotes with the same inclusions is more useful than relying on one national average.

Should I always choose the cheapest solar quote?

No. A cheaper quote may use different equipment, include less support, exclude scaffolding or electrical work, or provide a shorter workmanship warranty.

Why do similar solar quotes have different prices?

Differences commonly come from panel and inverter brands, system design, roof access, scaffolding, electrical upgrades, warranties and installer overhead.