Use one regulated 12 VDC supply for the RIO and two pumps only if the supply can carry the combined load and each RIO DC output is rated to switch its assigned pump. The evidence identifies a 10–32 VDC RIO input range, but it does not identify the RIO model, output circuit type, output current rating, pump current, or motor-starting current.
Separate Power Delivery from Output Switching
Distribute the 12 VDC supply through separate branches to the RIO and both pumps. Treat the RIO outputs as pump-control paths, not as an assumed source of all pump power. Confirm from the applicable RIO documentation whether each output sources field voltage or merely switches an externally supplied circuit before wiring the pumps.
| Branch | Required operation | Known constraint |
|---|---|---|
| RIO power | Continuous | 12 VDC is within the stated 10–32 VDC input range. |
| Pump 1 | Continuous, 24/7 | Supply and output path must carry continuous pump current. |
Size the Shared 12 VDC Supply
Obtain the RIO input current and each pump's running and starting-current requirements. Select the supply so its continuous-current capability covers the simultaneous RIO load plus both pumps when both can run together. Do not size it from the three-minute timer alone: the switched pump still presents its full instantaneous running and starting load while energized.
Wire and Control the Two Pump Branches
- Feed the RIO from its own branch of the 12 VDC supply.
- Connect the continuously required pump through its assigned branch and output-controlled path only if that output is suitable for continuous energization.
- Connect the timed pump through a different RIO output-controlled path so the two pumps operate independently.
- Configure Node-RED to command the timed output for three minutes approximately six times per day.
Whether the supply return must be common with the RIO output circuit depends on the actual output topology. Determine that from the model-specific wiring diagram; the supplied evidence does not establish isolation, sourcing, sinking, or relay behavior.
Verify Before Continuous Service
Confirm the output voltage and polarity with the pumps disconnected, then test each pump independently. Finally, run both pumps together and verify stable 12 VDC operation, correct independent switching, and acceptable supply and output loading. A successful timer command does not prove adequate electrical capacity; verify the continuous branch under 24/7 conditions and the timed branch during startup.
FAQ
Can one 12 VDC supply power the RIO and two pumps?
Yes, provided 12 VDC is acceptable for every load and the supply current rating covers the RIO plus both pumps operating simultaneously, including startup requirements.
Can a RIO DC output power a pump continuously?
The evidence does not provide the output type or rating. Confirm that the selected output can switch the pump's continuous and starting current before using it for 24/7 operation.
How long does the Node-RED-controlled pump run each day?
This runtime does not reduce the instantaneous current required while the pump is running or starting.
