Lead Solar Design Engineer – Commercial PV & Battery

Energy Jobline ZR; Cardiff; On-site; GBP 45,000 - 55,000; Full time

Benefits offered by this job

Company vehicle

28 days holiday

Job summary

Unify HQ in Cardiff is seeking a Solar Design Engineer to own the technical design, specification and QA of commercial solar PV and battery installations across South Wales. You will produce compliant layouts and specs, support installers with queries and ensure adherence to standards and manufacturer requirements.

Ideal candidates will have proven PV design experience, strong electrical knowledge, and familiarity with MCS standards, G98/G99/G100 and DNO requirements.

Qualifications

• Proven experience designing and specifying solar PV and battery systems.
• Strong knowledge of electrical installation practices and BS 7671.
• Experience working with MCS standards for PV and storage.
• Confident interpreting surveys, photos and roof plans.
• Ability to identify risks, compliance issues and optimisation opportunities.

Responsibilities

• Lead the end‑to‑end technical design of commercial solar PV and battery systems.
• Produce compliant PV layouts, inverter/battery specifications, cable schedules and SLDs.
• Validate roof plans, shading analysis and system performance estimates.
• Ensure all designs meet G98/G99/G100 and DNO requirements.
• Provide technical guidance to installers, project managers and customers.
• Troubleshoot design issues and refine system specifications based on installer feedback.
• Improve internal design processes, templates and technical documentation.
• Stay up to date with solar and battery technologies, standards and best practice.

Skills

PV design

Electrical installation

MCS standards

Roof plan interpretation

Technical guidance

Tools

PVSol

Helioscope

OpenSolar

Job description

Unify HQ in Cardiff is seeking a Solar Design Engineer to own the technical design, specification and QA of commercial solar PV and battery installations across South Wales. You will produce compliant layouts and specs, support installers with queries and ensure adherence to standards and manufacturer requirements.

Ideal candidates will have proven PV design experience, strong electrical knowledge, and familiarity with MCS standards, G98/G99/G100 and DNO requirements.