Question 1

how long does it take and cost to get ul 1741 certification for inverters

Accepted Answer

Obtaining UL 1741 certification for a solar inverter typically takes 6 to 9 months and costs between $30,000 and $50,000. The process includes 12 months of factory inspections and requires testing to UL 1741 SA/SA-S and NEC Article 690 standards. Annual renewal and follow-up service fees are usually around $15,000.

Question 2

what is the difference between ce and iec certification for solar panels

Accepted Answer

CE is a mandatory European conformity mark (taking about 4-6 weeks and costing $5,000-$8,000) that proves a product meets EU health and safety directives. IEC (e.g., IEC 61215 for design qualification and IEC 61730 for safety) is an international technical standard. To sell in Europe, you need both: the IEC test reports are required as the technical basis to issue the CE Declaration of Conformity.

Question 3

do i need g99 certification to connect a 10kw battery to the uk grid

Accepted Answer

Yes, any battery inverter larger than 3.68kW (single-phase) or 11.04kW (three-phase) connected to the UK grid requires G99 Type B certification and DNO approval. For a 10kW battery system, the testing and G99 application process typically takes 8-12 weeks and costs around $12,000, ensuring the system can handle grid faults without tripping.

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