Partner
Links.
Sites, tools, and independent resources we believe are worth your time — curated for solar PV professionals.
Partner
Links.
Independent sites and tools that we believe offer genuine value to solar PV professionals — and a unique approach to growing the industry as a whole.
UL 3741 is one of the most consequential — and least understood — standards in residential and commercial solar. It allows PV arrays to satisfy NEC rapid shutdown requirements through system-level testing rather than component-by-component compliance, but only when every element of the array (racking, inverter, modules) is specifically listed together. The challenge: that web of cross-certifications is spread across dozens of manufacturers and hundreds of product combinations, with no central reference.
The 3741 Reference is exactly that missing central reference. It catalogs every currently listed UL 3741 product combination — searchable by racking system, inverter manufacturer, and roof type (pitched, flat, solar shingle) — so installers, engineers, and AHJs can quickly confirm what's listed with what. Sponsored by SMA America, Seaward, TerraGen, and others, it's an independent, openly accessible resource maintained by the solar community for the solar community.
For anyone specifying, commissioning, or inspecting residential or commercial rooftop arrays, this is the kind of resource that should be bookmarked and kept current.
Most tool suppliers serve construction broadly — solar installers make do with whatever fits. Solar Tools USA was built around the opposite premise: a dedicated storefront for tools, safety gear, and accessories designed specifically for the demands of PV installation and O&M work. Based in Meridian, Idaho, the company curates and develops products across every phase of a solar job — from module staging and racking to electrical testing, fall protection, and panel cleaning.
Their own product line includes standouts like the Solar Panel Hanger (a staged mounting tool that acts as an extra set of hands on rooftop installs), the Solar Panel Caddy (a module-movement tool built for job site ergonomics), the Permanent Roof Anchor (a post-construction tie-off solution with QR-code inspection tracking), and the SCAT 3.5 torque-limited MC4 connector assembly tool. Third-party brands on the platform span Staubli, Petzl, Megger, Rennsteig, and a growing cleaning robotics lineup including hyCLEANER and Solarrow.
For commissioning and O&M crews, the electrical testing category is worth a direct look — it reflects the same field-first sensibility as the rest of the product selection. If you've spent time improvising with general-purpose tools on a solar site, Solar Tools USA represents the alternative the industry has needed.
HelioVolta is an independent technical services firm focused on the safety, reliability, and performance of solar and storage assets. With more than 1,000 commercial and utility PV systems inspected and 5 GW of assets evaluated in the field, their team provides owner's engineering, construction QA/QC, third-party health audits, root cause analysis, and commissioning oversight — serving asset owners, EPCs, O&M providers, and insurance carriers across the project lifecycle. They deploy SolarGrade, their own purpose-built inspection software, to standardize field documentation and generate portfolio-level trend analytics.
Their published research is among the most rigorous field-data-driven work in the industry. The flagship publication is the SolarGrade PV Health Report — now in its third annual edition — which rates the construction quality of more than 70 EPCs and nearly 120 subcontractors using data drawn from over 1,000 project inspections. The 2025 edition is the most comprehensive yet, covering serial defect trends, connector failure rates, wire management findings, and rapid shutdown device safety risks across a cross-section of the commercial and utility solar market. It is the closest thing the industry has to an independent, field-data-backed construction quality benchmark.
Their Resource Library is freely accessible and includes the full PV Health Report series alongside white papers on connector safety, wire management standards, PV system fire prevention, and rapid shutdown device risks — each grounded in field inspection data rather than manufacturer claims.