Is Solar Worth It? Real Numbers Before You Decide

The most-asked question before going solar. This guide answers honestly with real figures — payback period, actual savings, who's a good fit, and who shouldn't install yet, so you can decide with confidence.

When Is It Worth It? Look at Your Bill

Solar pays off best for homes using 3,000+ THB/month with high daytime usage (work from home, daytime occupants, shops). An On-Grid 5kW system pays back in 3.8-4 years, then it's pure savings for 20+ more years — 800,000+ THB cumulative. If you mainly use power at night with bills under 2,000 THB, payback is slower.

Who Should and Shouldn't Install

Good fit: high electricity bills, daytime AC use, good sun exposure (south/west facing, no shading), homeowner. Not yet: renters (can't take it when you move), heavily shaded roofs, very low usage, or about to renovate the roof.

What to Know First

Choose genuine equipment with warranty (panels 25-30 yrs, inverter 10 yrs), install with a team that files MEA/PEA permits properly, pick an inverter with AFCI fire protection, and size the system to your usage — not so big it's wasted, not so small it's not worth it. QES engineers size it free.

Get a Free Quote

QES engineers help size the right system for your home or business.

View all solar equipment Free consultation via Line 083-987-2899

Frequently Asked Questions

What's the solar payback period?

An On-Grid system pays back in about 3.8-4 years at 5 THB/unit, depending on daytime usage.

Can I sell solar power back?

In some programs (Net Metering/Net Billing), but the buyback rate is lower than the retail rate — so it's better to consume all the power you generate.

How long does solar last?

Panels last 25-30 years (performance warranty 25-30 yrs), inverters 10-15 years, LiFePO4 batteries 8,500+ cycles (10+ years).