andrewNZ: This is becoming a discussion for elsewhere but ray is right for it to be high risk PEW it must first be PEW.

If it never exceeds 110vdc, and is standalone, it isn't PEW.

I think you are assuming that extra low voltage automatically means it's not prescribed electrical work, ESR 59 covers low and extra low voltage installations, 60(2)(d) also requires compliance with AS/NZS 5033 PV Arrays.

Electricity Act 1992 also defines prescribed electrical work

prescribed electrical work means electrical work prescribed in regulations
made under section 169, being work that falls into any of the following categories:
(a) the design or construction or maintenance of electrical installations:
(b) the maintenance of electrical appliances:
(c) the connection or disconnection of works, electrical installations, and
electrical appliances to or from a power supply, other than by means
of—
(i) a plug; or
Reprinted as at
18 October 2016 Electricity Act 1992 Part 1 s 2
19
(ii) an appliance inlet; or
(iii) a pin—
that is inserted into a socket outlet:
(d) the design or construction or maintenance of works:
(e) the testing or certification or inspection or supervision of the work described
in paragraphs (a) to (d)