What is THE most asked question?

'How much do solar panels cost?' — £5,500-£8,000 for a 4kW system at 0% VAT. The second most asked: 'Are they worth it?' — yes, 100-400% ROI.

Most Popular Solar Questions 2026

By Home Solar Guide Team|Updated 18 March 2026|guide

Independently written | Evidence-based | Sources cited

Most asked solar questions — The 10 questions everyone asks — answered with evidence, not opinions.

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What are the most asked solar questions?

Top 10 UK solar questions answered: (1) How much? £5,500-£8,000 (4kW). (2) Worth it? Yes — 100-400% ROI. (3) How work? Sunlight → silicon → electricity → inverter → home. (4) Grants? 0% VAT + SEG. No direct grant for most. (5) Battery? Optional £3,000-£7,500, adds £200-£400/yr. (6) Payback? 8-12 years. (7) Maintenance? Near-zero. (8) Cloud/rain? Yes — 10-30% output in cloud. (9) Planning? Usually not needed. (10) Start? Get 3+ MCS quotes → compare → install. That covers 90% of what you need. See our detailed guides for the other 10%.