26
Inverter model
Recommended AC branch protection
PVI 3800TL
2-pole, 20 A 208/240 Vac
PVI 5200TL
2-pole, 35 A 208 Vac / 30 A 240 Vac (max 40 A)
PVI 6600TL
2-pole, 40 A 208/240 Vac (max 40 A)
PVI 7600TL
2-pole, 40 A 208/240 Vac (max 40 A)
4.3
AC circuit breaker requirements
There are a large number of PV module string combinations that will offer optimal performance
from either the PVI 3800TL, PVI 5200TL, PVI 6600TL and PVI 7600TL inverters due to its wide
MPP DC voltage range (200 V – 500 V).
A dedicated circuit breaker in the building circuit panel is required for each Solectria PVI inverter
that is installed. There should be a circuit breaker or fuse to protect each AC line, L1 and L2. The
circuit breaker should be able to handle the rated maximum output voltage and current of the
inverter. Please refer to the table below to determine the appropriate circuit breaker size to avoid
potential fire hazards. The National Electrical Code (NEC), ANSI/NFPA 70 or applicable local elec
-
trical codes must be folllowed when determining maximum branch-circuit over-current protection
requirements.
4.4
Grounding Electrode Conductor (GEC)
Per NEC 690.47, a GEC must be installed, and the Grounding Electrode Terminal (GET) conduc-
tor must be sized in accordance with NEC article 250.166. The GET conductor should be termina-
ted at the GET screw terminal inside the wiring box compartment.
4.5
Lightning and surge protection
Solectria PVI inverters are designed and certified to meet stringent UL 1741 / IEEE 1547 and
ANSI/ IEEE 62.41/62.42 AC lighting and surge requirements; however, every PV installation is
unique, thus additional external UL/NEC AC and DC surge protection and solid grounding practice
are recommended
4.6
Multiple inverters
Multiple Solectria PVI inverters are permitted at a common location if all applicable NEC, state,
local building codes and local utility commissioning guidelines are met. In addition, each inverter
should have its own dedicated AC branch protection circuit breaker and a dedicated PV string/
array, not to exceed the inverter’s ratings.
4.7
PV string considerations
