What is the biggest solar buying mistake?

Choosing purely on price. A £1,000 saving from budget components can cost £5,000+ over 25 years through lower output, earlier failure, and no warranty recourse.

How do I avoid solar mistakes?

Get 3+ MCS-certified quotes, compare on TOTAL VALUE not just price, insist on a site survey, choose a hybrid inverter, verify MCS certification, and install now rather than waiting.

5 Solar Buying Mistakes to Avoid

By Home Solar Guide Team|Updated 7 August 2026|guide

Independently written | Plain-English guide

Avoid solar buying mistakes with research — 5 common mistakes cost £500-£5,000+ each. A little research prevents all of them.

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What are the biggest solar buying mistakes?

The 5 costliest solar buying mistakes: (1) Comparing only on PRICE not total value (budget panels may cost more over 25 years). (2) Skipping the site survey (desktop-only quotes miss shading and structural issues). (3) Choosing a basic string inverter when you might want a battery (hybrid costs £200 more now, saves £1,000+ later). (4) Not checking certification - SEG needs MCS or an accredited equivalent. (5) Waiting for prices to drop (losing £580-£900/year while waiting). Each mistake costs £500-£5,000+.