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Commissioning and Operation
WARNING: Qualified personnel only may connect the Enphase Microinverter to the utility
grid after receiving prior approval from the electrical utility company.
WARNING: Ensure that all AC and DC wiring is correct. Ensure that none of the AC and
DC wires are pinched or damaged. Ensure that all AC junction boxes are properly closed.
Energize the System
1. Turn ON the AC disconnect or circuit breaker for each microinverter AC branch circuit.
2. Turn ON the main utility-grid AC circuit breaker. Your system will start producing power after
a five-minute wait time.
3. The Enphase Microinverters will begin communicating over the power lines to the Envoy.
time required for the Envoy to discover all of the microinverters varies with the number of
microinverters in the system and quality of the power line communications. At a typical
residential installation, all of the microinverters are detected within 20 minutes. Large systems
of 250 to 500 microinverters typically take one to two hours to detect all of the microinverters.
4. The M250 has field-adjustable voltage and frequency trip points. If adjustments are required
by your local utility, the installer can use the Envoy to Manage the Grid Profile after all
microinverters have been detected.
Check the Envoy's progress
Refer to the Envoy Quick Install Guide for details on the following steps.
1. An automatic device scan runs for 8 hours after the Envoy is installed. If this scan has
expired, start a new scan.
• Press and hold the Envoy menu button (on the right side of the Envoy).
• Release the menu button when the LCD displays Enable Device Scan.
2. Check that the Envoy LCD shows a complete device count after about 30 minutes.
3. Check power line communications as shown by the number of bars on the Envoy LCD.
• Press and hold the Envoy menu button (on the right side of the Envoy).
• Release the menu button when the LCD displays Enable Communication Check.
4. Use the Envoy menu button to stop the scan when all devices are detected:
• Press and hold the Envoy menu button (on the right side of the Envoy).
• Release the menu button when the LCD displays Disable Device Scan.
Configure the Grid Profile (optional)
If required by the local utility, use the Envoy interface to configure the Grid Profile (alternate voltage and
frequency trip points) for the system. Refer to the Envoy Communications Gateway Installation and
Operation Manual at
http://www.enphase.com/support
19
for instructions.
2013 Enphase Energy Inc.
M250 Installation and Operation
141-00022 Rev 01
The
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