For an off-grid PV system with an ungrounded array, does the battery bank negative need to be bonded to ground? Why or why not? Code reference?
I think that this would apply:
VIII. Direct-Current Systems
250.160 General. Direct-current systems shall comply
with Part VIII and other sections of Article 250 not specifically
intended for ac systems.
250.162 Direct-Current Circuits and Systems to Be
Grounded. Direct-current circuits and systems shall be
grounded as provided for in 250.162(A) and (B).
(A) Two-Wire, Direct-Current Systems. A 2-wire, dc system
supplying premises wiring and operating at greater than
60 volts but not greater than 300 volts shall be grounded.
Exception No. 1: A system equipped with a ground detector
and supplying only industrial equipment in limited areas
shall not be required to be grounded where installed
adjacent to or integral with the source of supply.