ETENWOLF S1 Portable Tire Inflator Motor Load Current Test Report (2025-09-19)

Document Overview

Key Findings Two S1 units (8# and 9#) were tested under progressive load from 10 PSI to 160 PSI on 2025-09-19. Both samples exhibited consistent current draw profiles, peaking near 100 PSI and tapering symmetrically at higher loads, confirming stable motor performance across the full…

Document type

Test Report

Prepared by

Daniel Wright

Published

July 22, 2026

Last reviewed

July 22, 2026

Topics

Motor Performance

Key Findings

Two S1 units (8# and 9#) were tested under progressive load from 10 PSI to 160 PSI on 2025-09-19. Both samples exhibited consistent current draw profiles, peaking near 100 PSI and tapering symmetrically at higher loads, confirming stable motor performance across the full operating range.

• Test Type: Motor Performance — Load Current Measurement
• Samples Tested: 2 units (8#, 9#)
• Load Range: 10.0 PSI to 160.0 PSI (16 measurement points per unit)
• Peak Current (8#): 9.7 A at 90.0–100.0 PSI
• Peak Current (9#): 9.3 A at 90.0 PSI
• Minimum Current (both): ~6.9 A at 10.0 PSI
• Test Date: 2025-09-19

Test Overview

Test Equipment & Setup

Test Procedure

1. Pre-Test: Verify sample units (8# and 9#) are fully assembled and in factory condition. Connect current measurement instrumentation in series with each unit’s power supply circuit.
2. Setup: Set initial load to 10.0 PSI. Record ambient conditions. Ensure the inflation output is connected to a calibrated pressure-controlled load.
3. Measurement: For each sample, apply load incrementally from 10.0 PSI to 160.0 PSI in 10.0 PSI steps. At each load point, allow current to stabilize, then record the current draw in Amperes.
4. Data Recording: Log the measured current (A) against each load value (PSI) for both Sample 8# and Sample 9# in parallel columns.
5. Post-Test: Power down both units. Verify no anomalies (smoke, overheating, abnormal noise) were observed during the run. Confirm all 16 data points per sample are captured.
6. Acceptance Criteria: Current readings must remain within a consistent, physically plausible profile (rise to peak then taper). Any sudden deviation, motor stall, or current spike beyond instrumentation range constitutes a failure.

Test Data & Results

Observations: Both samples display a bell-shaped current curve peaking between 90–100 PSI. Sample 8# reaches a slightly higher peak (9.7 A at both 90 and 100 PSI) compared to Sample 9# (9.3 A at 90 PSI). The two profiles track closely throughout, with the largest divergence of 0.6 A observed at 130 PSI (8# at 9.1 A vs. 9# at 8.5 A). Both units return to low-current operation above 130 PSI as back-pressure reduces effective motor load. No anomalous spikes or drop-outs were recorded.

Conclusion

Document Information

Frequently Asked Questions

What does the load current test measure on the ETENWOLF S1 tire inflator?

The load current test measures the electrical current drawn by the S1’s motor at progressively increasing pressure loads, from 10 PSI to 160 PSI in 10 PSI increments. This data reveals how the motor responds under real-world inflation conditions and confirms it operates within safe current limits throughout its range.

At what pressure does the ETENWOLF S1 draw the most current?

Both tested S1 units peaked between 90 and 100 PSI. Sample 8# drew a maximum of 9.7 A at both 90 PSI and 100 PSI. Sample 9# peaked at 9.3 A at 90 PSI. Above 100 PSI, current decreases as back-pressure reduces the mechanical load on the motor.

How consistent are two different S1 units in their current profiles?

The two tested units (8# and 9#) tracked closely across all 16 load points. The largest difference between the two samples was 0.6 A at 130 PSI. This tight unit-to-unit variation indicates consistent motor assembly quality in the S1 production batch tested on 2025-09-19.

Is a higher current draw at mid-range pressure normal for a tire inflator motor?

Yes. A bell-shaped current curve is normal for a positive-displacement air pump motor. Current rises as air compression work increases up to the motor’s peak efficiency point, then decreases at higher pressures because the reduced flow rate lowers the mechanical power demand. The ETENWOLF S1’s profile follows this expected pattern without anomalies.

Related Products

Explore the full ETENWOLF S1 test documentation and related inflation tools:

• ETENWOLF S1 Portable Tire Inflator — Product Page
• ETENWOLF Group — Full Product Catalog

Sibling test sheets from the same source file (S1-负载电流数据2025.9.19.xls):

• Sheet2 — Additional S1 load current data (same test session)