GENERAC PWR Cell Commissioning User Guide
- July 12, 2024
- Generac
Table of Contents
GENERAC PWR Cell Commissioning
Product Specifications
- Product Name: PWRcell Inverter
- Power Output: Single Phase 120/240V
- AC/DC Disconnects: Yes
- REbus Wiring: Required
- Grounding: Inverter grounding bar connection
- Resistance Measurements: >10 kOhms for RE+ to RE-, RE+ to Ground, RE- to Ground
Product Usage Instructions
Commissioning Quick Start
Before commissioning the PWRcell Inverter, ensure the following steps are completed:
Pre-Commissioning Checklist
- Ensure all AC/DC disconnects are turned off.
- Check REbus wiring, ensuring proper labeling and correct polarity.
- Verify ground connection from the inverter grounding bar to each device.
- Perform a voltage check on REbus connections before measuring resistance.
Resistance Measurement
- Turn all DC Disconnects OFF.
- Measure resistance at RE1, RE2, RE3, and RE4:
- RE+ to RE- resistance should be >10 kOhms.
- RE+ to Ground resistance should be >10 kOhms.
- RE- Ground resistance should be >10 kOhms.
- Turn DC Disconnects ON.
AC Power Check
- Turn on the inverter back-feed breaker and perform the necessary checks based on the inverter series installed. Energize only one inverter back feed breaker at a time for multiple systems.
- Ensure the PWRcell Inverter powers on.
- Note: The provided voltage ranges are for IEEE1547 grid compliance default settings.
GENERAC PWR Cell Commissioning User Guide
Pre-Commissioning Checklist
All AC/DC disconnects should be off
Check REbus wiring
Ensure REbus wiring is labeled on both ends and visually inspect for correct polarity.
-
Verify ground connection from inverter grounding bar to each device
NOTE: Perform a voltage check on REbus connections prior to measuring resistance to prevent meter damage should line voltage be present.
NOTE: All REbus checks must be performed prior to energizing the system. -
Turn all DC Disconnects OFF and measure resistance at RE1/RE2/RE3/RE4
-
RE+ to RE- resistance is >10 kOhms
-
RE+ to Ground resistance is >10 kOhms
-
RE- to Ground resistance is >10 kOhms
-
Turn DC Disconnects ON
Check AC Power
Turn on inverter back-feed breaker and make the following checks based on the
inverter series installed.
If multiple PWRcell inverter systems are installed, have only one inverter
backfeed breaker energized at a time.
NOTE: The PWRcell Inverter will power on at this time.
NOTE. Ranges listed are for |EFF1547 arid compliance default settings only
Single Phase 120/240 V Inverter AC Power Checks
Line Voltage Check
- Neutral to Ground is <5 VAC
- L1 to Neutral is 110-128 VAC
- L2 to Neutral is 110-128 VAC
Phase Voltage Check
- L1 to L2 is 220-256 VAC
3 Phase 120/208 V Inverter AC Power Checks
Line Voltage Check
- Neutral to Ground is <5 VAC
- L1 to Neutral is 110-128 VAC
- L2 to Neutral is 110-128 VAC
- L3 to Neutral is 110-128 VAC
Phase Voltage Check
- L1 to L3 is 190-222 VAC
- L1 to L2 is 190-222 VAC
- L2 to L3 is 190-222 VAC
Commissioning Procedure
NOTE: Perform Pre-Commissioning Checklist prior to commissioning-
NOTE: If installing high-voltage PV modules or an automatic transfer switch,
read the manuals included with your Generac PWRcell products for scenario-
specific instructions.
STOP: For Multiple Inverter Systems Commissioning, please follow the procedure in the “Multiple Inverter Systems Commissioning” Section in the PWRcell Inverter Installation Manual.
-
Register inverter at https://pwrfleet.generac.com.
NOTE: Registration activates the warranty. -
Ensure the Generac PWRcell Inverter is connected to AC Power (If
Pre-Commissioning Power Checks were performed, skip this step). -
Turn DC disconnects to the ‘ON’ position.
-
Select system mode on the Generac PWRcell Inverter control panel.
NOTE: Do not select Grid-tie mode for systems that include a battery. -
Configure inverter settings.
If backup power is required: -
Confirm Enalslanding is set to ON.
-
Turn ON Generac PWRcell Inverter protected loads breaker.
-
Turn ON the Generac PWRcell Battery disconnect switch.
If zero-export is required: -
Change EnaZeroExp from OFF to ON.
-
Select the inverter compliance setting
-
If local grid specifications differ from lEEE 1547, use the installer tool application available on Beacon to configure these settings while on site. Refer to the Installer Configuration Tool Guide for instructions.
NOTE: Inverter must be Disabled to change settings -
Enable Generac PWRcell Inverter through the inverter device page.
-
Enable Connected REbus M Devices.
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Verify connected Generac PV Links and Generac PWRcell Battery display as their own page on inverter.
-
Enable Generac PV Link one at a time
-
If installing with SnapRS devices, select Enable with PVRSS.
NOTE: Enable with PVRSS option is only used when commissioning. -
Verify SnapRSInstalld value under Mod. Settings matches the installed number of SnapRS devices. Confirm Generac PV Links are making power.
-
Low sun could indicate a connection issue on the input side of the Generac PV Link if the sun is shining.
-
If Generac PV Link device page does not appear on inverter, check polarity and ground connections.
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Enable Generac PWRcell Battery from battery device page on inverter
-
See Generac PWRcell Battery Owner’s Manual for information on adjusting battery depth of discharge
-
If CTs installed, verify the utility pole icon displays on the bottom right of the home screen.
If CT icon does not display: -
Confirm wiring and CT placement. See Connecting Current Transformers section in Generac PWRcell Inverter installation manual for more information.
-
Recalibrate CTs per instructions in the Generac PWRcell Inverter Installation Manual.
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Verify CT icon displays on home page of inverter screen.
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Test islanding ability by shutting OFF home AC power.
Frequently Asked Questions
Q: What should I do if the resistance measurements are below 10 kOhms?
A: If any of the resistance measurements are below 10 kOhms, do not proceed
with energizing the system. Check the wiring mconnections and ensure proper
grounding before reattempting the measurements.
Q: Can I energize all DC Disconnects simultaneously?
A: No, it is recommended to turn on the DC Disconnects one at a time after
completing the resistance measurements to ensure safe operation.