Generac — Using Vset Function
Adjustments · Battery modules
From a Generac service manual covering: PWRcell M3, PWRcell M3 DCB, PWRcell M4, PWRcell M4 DCB, PWRcell M5, PWRcell M5 DCB, PWRcell M6, PWRcell M6 DCB. Check it applies to your exact model before use.
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Before you start
- Never reach into port or touch battery terminals with hands or tools.
- Ensure all battery modules installed in any single PWRcell Battery are the same type (EX or DCB).
Procedure
- Ensure inverter system is set to Priority Backup or Clean Backup system mode.
- Measure the voltage of each new battery module at the module main power terminals using a digital multi-meter and record the values.
- Navigate to the PWRcell Battery device page and press the center button; select 'Mod. Settings'.
- Navigate to the last setting, 'Module Vset', and select using the center button.
- Enter the voltage value measured from the new module(s) if different from the default and 'Save' changes.
- Select 'Start Vset' from the PWRcell Battery main menu.
- The battery will start discharging; look for the Battery Status LED to be green, rapid flashing.
- Once Vset has finished, check existing module voltages at their module main power terminals with a digital multi-meter.
- Add the new battery module(s) to the stack by connecting the battery power harness and appropriate Cat 5 communication cables.
Tools required
- Digital multi-meter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- If module voltages differ by more than 300 mV (0.3 Volts) from each other, perform the Vset procedure individually for each module
Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.