SE Engineering certification — how different is it from the NABCEP path

For utility-scale and C&I engineering roles at EPCs, the PE license matters more than either NABCEP or SE Engineering credentials. If you have a PE, your ME license is transferable to solar with experience. NABCEP is respected in the industry but EPCs at the engineering level are primarily looking at PE + solar experience.

The NABCEP PV Technical Sales credential is sales-oriented — probably not what you want for an engineering track. NABCEP's PV System Inspector or the Associate credential are more engineering-focused but still more installation/inspection than design.

Your HVAC design background is genuinely valuable for solar + storage (thermal storage, building integration) and for the heat management aspects of utility-scale projects. Frame your transition around that overlap and the credential becomes less important than your engineering portfolio.

SunSpec Alliance has a Solar Energy Engineer designation that some C&I firms recognize. The SEI (Solar Energy International) credentials are more training-focused. For PE-level work, the target is really getting project experience first — credentials alone don't substitute for demonstration of engineering competence in a new domain.