How we rank: Solar panels
The Score (0–100) is a weighted sum of the factors below. Each factor is the weighted average of its metrics; each metric is calculated from one published fact. Missing facts score zero, and a service is ranked only when enough of its Score is backed by facts.
A service is ranked only when at least 60% of its Score is backed by verified facts.
← Solar panel installers in Belarus 2026: a fact-based ranking
Trust 30%
Whether the legal entity and registry number are stated on the site or found in a public register, whether a trade qualification of the installers is stated (for example UDT certificates in Poland, Handwerksrolle entry in Germany, SRO membership or a licence in CIS countries), and years on the market (full marks from 20 years). ISO 9001 and manufacturer partner badges do not count as a qualification.
| Metric | Rule |
|---|---|
| Legal entity and registry number stated | Yes = 100, No = 0 |
| Installer qualification stated | Yes = 100, No = 0 |
| Year founded | Full score at 20+ years |
Warranties 25%
The company's own warranty on the installation work (full marks from 10 years) and the linear performance warranty on the panels it installs (full marks from 30 years). The work warranty weighs three times more because the installer itself stands behind it.
| Metric | Rule |
|---|---|
| Warranty on the work, years | Linear from 0 (0) to 10 (100) |
| Panel performance warranty, years | Linear from 0 (0) to 30 (100) |
Track record 15%
Stated cumulative installed capacity (log scale up to 1 GW) and stated number of installations (log scale up to 100,000). These are the companies' own figures; we do not verify them on site.
| Metric | Rule |
|---|---|
| Stated installed capacity, kWp | Logarithmic, full score at 1,000,000 |
| Stated installations | Logarithmic, full score at 100,000 |
Services 15%
Whether there is a turnkey offer from design to grid connection, service or monitoring after installation, help with credit, leasing or a subsidy, and whether concrete panel and inverter brands are named.
| Metric | Rule |
|---|---|
| Turnkey installation | Yes = 100, No = 0 |
| Service after installation | Yes = 100, No = 0 |
| Help with financing or subsidies | Yes = 100, No = 0 |
| Panel brands named | Yes = 100, No = 0 |
| Inverter brands named | Yes = 100, No = 0 |
Transparency 15%
Whether at least one concrete price or example offer is published without a form, whether the way to file a complaint is described, and how many contact channels are stated: phone, email, chat or messenger, web form.
| Metric | Rule |
|---|---|
| Prices published | Yes = 100, No = 0 |
| Complaints procedure | Yes = 100, No = 0 |
| Contact channels (of 4) | Linear from 0 (0) to 4 (100) |