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28 DOCR 070366-B

Inverter model Maximum AC branch protection

PVI 3800TL

2-pole, 20 A 208/240

PVI 5200TL

2-pole, 40 A 208/240

PVI 6600TL

2-pole, 40 A 208/240

PVI 7600TL

2-pole, 40 A 208/240

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 their wide

MPP DC voltage range (200 V – 500 V). Please use Solectria‘s online string sizing tool at

www.solectria.com/string-sizing-tool.

A dedicated over current protection device in the building circuit panel is required for each So-

lectria PVI inverter. There must be a circuit breaker or fuse to protect each AC phase, L1 and L2.

The over current protection device 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 electrical codes must be followed 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 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

are recommended. The inverter comes equipped with class II AC and DC surge arrestors.

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. However, each inverter

must have its own dedicated AC overcurrent protection device and a separate PV array.

4.7 PV string considerations

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