The ETENWOLF S5 is a heavy-duty cordless tire inflator built for large SUVs, pickup trucks, and off-road vehicles. A 15,600 mAh battery powers a brushless motor delivering 42 L/min at 160 PSI with a verified 100% duty cycle — enough to inflate 3 full-size 265/65R18 tires from 0 to 35 PSI on a single charge. PD USB-C 30W input charges the unit in 2 hours 3 minutes, and the same port outputs 30W for phone charging. At 1,690 g, the S5 is approximately twice the battery capacity of the S3 in a package 640 g heavier.
42 L/min
Max Airflow
160 PSI
Max Pressure
100%
Duty Cycle
15,600 mAh
Battery Capacity
3 Tires
Per Charge (265/65R18, 0→35 PSI)
±1 PSI
Pressure Accuracy
160 PSI Max Pressure & ±1 PSI Accuracy
The S5 operates across the full 0–160 PSI range with ±1 PSI accuracy, verified at 20, 35, 60, 100, 130, and 160 PSI. Auto-stop cuts the motor precisely at the preset target. Six preset modes cover the most common vehicle types, with a custom mode for any target pressure and a blowing mode for dust removal. The 160 PSI ceiling covers everything from sports balls (6–15 PSI) through large SUV tires (35–44 PSI) up to road bike tires (80–130 PSI).
| Preset Mode | Default Pressure |
|---|---|
| Car (sedan) | 35 PSI |
| Pickup truck | 35 PSI |
| Motorcycle | 30 PSI |
| Bicycle | 22 PSI |
| Ball | 8 PSI |
| Custom | User-defined (default 30 PSI) |
| Blowing mode | No pressure target |
100% Duty Cycle & Continuous Inflation
The S5 supports 100% duty cycle — continuous tire inflation without stopping to cool. Every unit undergoes pre-shipment aging: the motor runs continuously at 35 PSI back-pressure from full battery to empty, confirming no thermal fault. The S5’s 42 L/min airflow (double the S3‘s 22 L/min) means each large SUV tire takes significantly less time per inflation cycle, reducing total heat accumulation per session. Continuous 4-tire testing on large SUV tires (265/65R18) is in progress; the 3-tire-per-charge figure is confirmed as of 2026-06-15.
42 L/min Airflow & Inflation Data
At 42 L/min (0 PSI, 25°C ambient), the S5 is the fastest cordless inflator in the ETENWOLF lineup below the S6/S7. For top-up inflation (28→35 PSI), the S5 inflates a 195/55R16 tire in 53 seconds and can repeat this 38 times on a full charge. A 215/55R16 tire (28→35 PSI) takes 58 seconds with 31 repeats possible. For vehicles such as the Tesla Model series, BMW X5, Toyota Highlander, Ford Explorer, and Tank 500, the S5 handles the full pressure range without capacity limitations.
| Tire / Use Case | Start PSI | Target PSI | Time | Repeats per Charge |
|---|---|---|---|---|
| 195/55R16 (compact sedan top-up) | 28 | 35 | 53 sec | 38 |
| 215/55R16 (mid sedan top-up) | 28 | 35 | 58 sec | 31 |
| 265/65R18 (large SUV, full inflate) | 0 | 35 | — | 3 |
15,600 mAh Battery & Charging
The 15,600 mAh (57.72 Wh) battery uses Tianpeng cells and charges via USB-C PD at 30W. Full charge from 0% takes 2 hours 3 minutes — the fastest charge time in the S-series cordless range. Pass-through charging (inflate while plugged in) is not supported. Power Bank output: USB-C at PD 30W and USB-A at 5V/2A, delivering 3–5 phone charges per battery (based on 3,000–5,000 mAh phone capacity). Long-term storage recommendation is 100% charge, up to 36 months, with a top-up every 12 months.
| Parameter | Value |
|---|---|
| Battery capacity | 15,600 mAh / 57.72 Wh |
| Cell brand | Tianpeng (天鹏) |
| Charge input | USB-C PD 30W |
| Full charge time | 2 h 3 min |
| Pass-through charging | Not supported |
| Power Bank output (USB-C) | PD 30W |
| Power Bank output (USB-A) | 5V / 2A |
| Phone charges per battery | 3–5 |
| Tires per charge (265/65R18, 0→35 PSI) | 3 |
| Storage charge recommendation | 100% |
| Max storage duration | 36 months |
| Top-up interval | Every 12 months |
Noise Measurements
Noise was measured at 1 metre in front of the unit, background noise below 30 dB, using a calibrated sound meter on 2026-06-07. Results: 83 dB(A) at 30 PSI back-pressure, 83 dB(A) at 60 PSI, and 81 dB(A) at 100 PSI. The slight decrease at higher back-pressure is normal — as resistance increases, motor RPM drops slightly, reducing acoustic output. At 83 dB(A), the S5 is quieter than typical petrol-powered compressors (95–100 dB) and comparable to a busy restaurant environment.
| Back-Pressure | Noise (dB(A) at 1 m) | Test Date |
|---|---|---|
| 30 PSI | 83 | 2026-06-07 |
| 60 PSI | 83 | 2026-06-07 |
| 100 PSI | 81 | 2026-06-07 |
Technical Limits & Operating Conditions
The S5 is rated for vehicles up to large SUV and pickup class. 18-wheel commercial trucks are outside its intended use. At below 20% battery, output decreases slightly as cell voltage drops — normal electrochemical behaviour. In temperatures above 40°C, inflation speed is maintained without degradation. In cold conditions below −10°C, speed decreases due to reduced battery discharge efficiency — the unit starts and operates, but inflates more slowly. Pass-through charging is not supported; inflate and charge are separate operations.
| Condition | Behavior |
|---|---|
| Battery below 20% | Slight output reduction; normal operation continues |
| Temperature above 40°C | No speed reduction |
| Temperature below −10°C | Reduced speed; unit starts and operates normally |
| 18-wheel commercial truck | Not recommended |
| Pass-through charging | Not supported |
| Recommended tire size range | 15–21 inch; max tested 265/65R18 |
Compatible Vehicles
The S5 is optimized for large SUVs, pickup trucks, and off-road vehicles — vehicle classes where the S3‘s 7,800 mAh battery and 22 L/min would be insufficient for 4-tire inflation from flat. Confirmed compatible models include Tesla (all variants), BMW X5, Toyota Highlander, Ford Explorer, and Tank 500. The maximum confirmed tire size is 265/65R18 (off-road type, 3 tires per charge). For vehicles requiring blower function for air mattresses, inflatable tents, or camping gear, choose the S6 instead — the S5 does not include a blower mode.
| Vehicle Type | Example Models | S5 Compatible |
|---|---|---|
| Compact / mid sedan | Toyota Camry, Honda Accord | Yes |
| Mid-size SUV | Honda CR-V, Toyota RAV4 | Yes |
| Large SUV | BMW X5, Toyota Highlander, Ford Explorer, Tank 500 | Yes |
| Pickup truck | Ford F-150, GMC Sierra | Yes |
| Off-road / EV | Tesla (all), off-road 265/65R18 | Yes |
| 18-wheel commercial truck | — | Not recommended |
S5 vs S6 vs S7: Which Model to Choose
All three models support 100% duty cycle and 160 PSI. The S5 (1,690 g, 163×117×200 mm) is roughly half the physical size of the S6/S7 and the right choice for users who only need tire inflation. The S6 (2,750 g, 19,200 mAh, 45W charging) adds a blower mode for inflating air mattresses and camping tents — choose the S6 if you camp. The S7 (2,920 g) matches the S6 in size but steps up airflow to 52 L/min for faster inflation with the same blower capability — choose the S7 if you want maximum speed and have no concern about the larger footprint.
| Parameter | S5 | S6 | S7 |
|---|---|---|---|
| Airflow (max) | 42 L/min | — | 52 L/min |
| Max pressure | 160 PSI | 160 PSI | 160 PSI |
| Battery | 15,600 mAh | 19,200 mAh | — |
| Charge power | PD 30W | PD 45W | — |
| Weight | 1,690 g | 2,750 g | 2,920 g |
| Dimensions | 163×117×200 mm | 310×238×141 mm | 310×238×141 mm |
| Blower mode | No | Yes | Yes |
| Best for | Large SUV / pickup, compact form | Large SUV + camping | Max speed + camping |
Certifications & Compliance
The S5 holds CE (EMC + LVD), FCC, UN38.3, MSDS, and RoHS certifications, all issued by Shenzhen Walter Inspection Group.
| Certification | Report Number | Issuing Body | Date |
|---|---|---|---|
| CE (EMC + LVD) — EU CE Marking | WTH25H07183672E | Shenzhen Walter Inspection Group | 2025-07-22 |
| FCC — FCC Equipment Authorization | WTH25H07183674E | Shenzhen Walter Inspection Group | 2025-07-22 |
| UN38.3 (Lithium Battery) — UNECE TDG | WTH25D09236087B | Shenzhen Walter Inspection Group | 2025-09-16 |
| MSDS | WTH25D09236087B001 | Shenzhen Walter Inspection Group | 2025-09-16 |
| RoHS — EU RoHS Directive | WTH25X07183751C | Shenzhen Walter Inspection Group | 2025-08-07 |
Frequently Asked Questions
Can the S5 inflate a Ford F-150 (265/65R18) tire? How many per charge?
Yes. The S5 is rated for 265/65R18 tires — confirmed as the maximum tested size. On a full 15,600 mAh charge, the S5 inflates 3 tires of this size from 0 to 35 PSI (tested 2026-06-15). For a full four-tire set on a large pickup, start each session with a fully charged unit or carry a spare cable for top-up charging between sets.
Should I choose the S5 or S6?
Choose the S5 (1,690 g, 15,600 mAh, PD 30W, no blower) if you only need tire inflation and prefer a more compact unit — the S5 is roughly half the size of the S6. Choose the S6 (2,750 g, 19,200 mAh, PD 45W, blower mode) if you camp and need to inflate air mattresses, inflatable tents, or other large-volume low-pressure items. The S6 also charges faster (45W vs 30W) and carries 23% more battery capacity.
Can the S5 continuously inflate 4 large SUV tires without stopping?
The S5 supports 100% duty cycle — no mandatory cool-down between tires. However, battery capacity limits a full 265/65R18 set (0→35 PSI × 4) to 3 tires on a single charge. For a 4-tire session on large SUVs, start with a full charge and plan for a partial recharge before the fourth tire, or use the top-up inflation mode (28→35 PSI) which uses significantly less capacity per tire.
How many times can the S5 charge a phone?
3–5 phone charges on a full 15,600 mAh battery, depending on phone battery size (based on 3,000–5,000 mAh phone capacity). USB-C output is PD 30W; USB-A output is 5V/2A. Note that pass-through charging (inflating tires while charging the S5) is not supported.
Does the S5 work in cold weather (−10°C and below)?
Yes — the S5 starts and operates normally below −10°C. Inflation speed decreases because lithium-ion cells deliver lower discharge current at low temperatures. This is expected behaviour, not a malfunction. Allow the unit to warm slightly in a vehicle cabin before use for best cold-weather performance.
How long does the S5 take to fully charge?
2 hours 3 minutes from 0% to 100% using a 30W USB-C PD charger. This is the fastest charge time in the cordless S-series. Store at 100% charge; top up every 12 months during long-term storage. Maximum shelf life: 36 months.
