Cummins/Onan — Parallel operation wiring
Installation · Parallel Instapac units
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
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Before you start
- Don't attempt to use standard Instapacs for parallel operation without special modification instructions from the factory.
Procedure
- Connect 4 wire harness included with 'B' unit to TB2 in each unit. The harness is numbered with metal tabs for proper wiring.
- Install line and load wires to 'A' unit.
- Install N and AC wires from 'A' unit to 'B' units. See wiring diagram for 'A' and 'B' units packed with shipment.
- Check normal operation by applying AC power to regular load.
- Install input jumper leads included with 'B' units to connect all + and - leads in parallel.
- Connect the battery leads. Connect battery positive (+) lead to red (+) terminal of unit 'A'. Connect battery negative (-) lead to black (-) terminal of unit 'B' which is last in the series of Instapa
Source: Cummins/Onan owner's 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.