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4.4 AC Circuit Breaker Requirements
The main utility service panel must dedicate a single- or multi-pole
breaker to operate each installed 120/240/208 VAC PV Powered Inverter.
This circuit breaker must be sized to handle the rated maximum output
voltage and current of the inverter. To reduce the risk of fire, connect the
inverter/disconnect unit to the appropriate size circuit breaker provided in
Table 4-2. Maximum branch-circuit over-current protection is calculated
in accordance with the National Electrical Code (NEC), ANSI/NFPA 70 or
applicable local electrical codes.
An exception exists if a dedicated PV system AC sub-panel is used to
combine multiple inverters. The dedicated PV system AC sub-panel
requires a single breaker at the main utility service panel for a multiple
inverter installation.
Inverter Model
Required Circuit Breaker
PVP1100
1 pole 15A
PVP2000
2 pole 15A
PVP2500
2 pole 20A
PVP2800
2 pole 20A
PVP3000
2 pole 20A
PVP3500
2 pole 20A
PVP4600
2 pole 30A
PVP4800
2 pole 30A
PVP5200
2 pole 30A
Table 4-2 Recommended Branch Circuit Protection
4.5 Inverter Voltage and Frequency Limits
The inverter is factory calibrated to the voltage and frequency limits
specified in the following table.
Condition
Factory Setting Maximum Trip Time(s)
Voltage phase high (line to ground)
132.0
<1 second
Voltage phase low (line to ground)
105.6
<2 seconds
Voltage phase fast high (line to ground)
144.0
< 160ms
Voltage phase fast low (line to ground)
60.0
< 160ms
Voltage high line to line (240V inverters)
264.0
Voltage low line to line (240V inverters)
211.0
Voltage high line to line (208V inverters)
228.8
Voltage low line to line (208V inverters)
183.0
