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Formula Sun

Updated 2026-08-05 · 2,638 reviewed · 195 listed · Scored from 11 Google reviews · How we rank ›

5.0(11) 67 low data composite score See reviews on Google ✓ Google-verified
Residential Solar Panel SystemsSolar Energy CompanySolar Energy System ServiceSolar Panel Maintenance Service
Formula Sun
Services
Residential Solar Panel Systems, Solar Energy Company, Solar Energy System Service
Reviews
11

What recent reviews say

All 11 reviews are five-star. Customers consistently praise Phil Mercer's straightforward approach, quick responses, and honest STC advice that undercuts competitors' tricks. Installation is fast, tidy, and competent. One customer reported their system has delivered exactly as predicted after 8 years with zero degradation.

Based on limited recent reviews, so treat this as low-confidence.

Praised for
  • honest sales approach
  • fast communication and responsiveness
  • quality installation workmanship
  • competitive pricing
  • knowledgeable owner Phil Mercer
knowledgeable-stafffair-pricingtransparent-quotinghonest-advicereliable-installationresponsive-customer-serviceefficient-installation-teamgood-after-sales-support
Best for: Homeowners who value honest advice over sales tactics and want competitive pricing with proven long-term performance.

Strengths

  • Phil Mercer's honest STC and pricing approach
  • fast installation and communication
  • quality workmanship with zero degradation observed over 8 years
  • competitive quotes matched against multiple competitors

Worth knowing

  • Phil Mercer manages consultations, quoting, and communication personally
  • Installation completed in about 4 hours on typical residential job
  • System installed in 2013 has zero performance degradation after 8 years and matched forecast exactly
  • TW panels and Fronius inverters used in recent installs
  • Installers set up wifi and clean up after job
  • STC advice corrects competitor misconceptions (STCs issued post-installation, not bookable in advance)

What reviews say by service

Residential Solar Panel Systems
Fast, clean installation with honest component selection and competitive pricing.
Solar Energy System Service
Long-term performance tracks forecast exactly; no degradation observed after 8 years.
Solar Panel Maintenance Service
System checked year-on-year post-installation, demonstrating ongoing monitoring.

How it compares

  • Rated 5 against a 4.57 average across the 133 solar energy company businesses listed here.
  • Has more Google reviews than 40% of the businesses in this directory.

How we scored this

How We Score
Star rating 81
Review volume 47
Review recency 59
Review sentiment 65
Profile completeness 75
Verification 30

Rating breakdown

5
11
4
0
3
0
2
0
1
0

Common questions

How long does a typical residential solar installation take?
About 4 hours, with the property left clean and tidy afterward.
Can I lock in my STC value before installation?
No. STCs are issued after installation completes. Formula Sun gives full 2025-rate STC value rather than discounting them in advance like some competitors.
Does Formula Sun guarantee long-term system performance?
One customer's 2013 system has delivered exactly as forecast over 8 years with zero degradation; Formula Sun checks year-on-year production to monitor performance.
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Last updated 2026-08-05