Delta E Series - AC Circuit Breaker Requirements; Grounding Electrode Conductor (GET); Lightning and Surge Protection; Multiple Inverters

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Inverter model Recommended AC branch protection
E6 -TL -US 2-pole, 30 A 240 Vac
E8 -TL -US
2-pole, 40 A 240 Vac
4.3 AC circuit breaker requirements
Please note that there is an exception to the requirement of a dedicated circuit breaker in the buil-
ding circuit panel for each inverter if there exists a dedicated PV system AC subpanel that is used
to combine multiple inverters. In this case, only one breaker at the main building service panel
should be installed for a multiple inverter installation utilizing a dedicated PV system AC subpanel.
A dedicated circuit breaker in the building circuit panel is required for each Delta E series 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 re 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 (GET)
Per NEC 690.47, a Grounding Electrode Conductor must be installed, and the GET conductor
must be sized in accordance with NEC article 250.166. The GET conductor should be terminated
at the GET screw terminal inside the wiring box compartment.
4.5 Lightning and surge protection
Delta E series NA inverters are designed and certied 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
is recommended
4.6 Multiple inverters
Multiple Delta E series 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.
Table 4: Recommended AC branch protection for Delta E series solar inverters
There are a large number of PV module string combinations that will o󰀨er optimal performance
from either the E6-TL-US and E8-TL-US inverters
thanks to its wide full power MPP range (50 V – 480 V)
4.7 PV string considerations