Series Overview#
The Hipower HRIW Mobile Series is the company's compact Isuzu-powered trailer generator line, covering 22 to 110 kW across four models. All units are built in Olathe, Kansas and carry EPA Tier 4 Final certification, making them deployable on California job sites and in all regulated jurisdictions. The series targets construction, rental fleet, and temporary power applications where a compact, easily towable unit is required — the lower three models (22–62 kW) are sized for standard pickup truck towing, filling the gap between small portable generators and the larger 300 kW-class trailer units.
The engine progression across the series uses three Isuzu platforms. The HRIW-25 and HRIW-45 use the Isuzu 4LE2 (22 and 40 kW standby), a compact diesel proven in light construction and utility equipment. The HRIW-70 steps up to the Isuzu 4JB1 (62 kW standby) for the mid-compact range. The HRIW-125 (110 kW standby / 100 kW prime) uses the Isuzu 4HK1 — a 5.2-liter four-cylinder turbocharged engine established in heavy construction equipment across North America. All models use 277/480V (except the lower models which also support 120/240V and 208V/480V), and are available in single-phase and three-phase configurations depending on the model.
The HRIW is the entry-level rental mobile line in Hipower's trailer generator portfolio. For 300 kW and above, the HRFW (FPT Cursor 13) and HRJW (John Deere) series pick up where the HRIW leaves off.
How to Choose#
By standby capacity: The HRIW-25 (22 kW) is the entry unit for small construction tasks, temporary lighting, and event power. The HRIW-45 (40 kW) covers mid-compact needs. The HRIW-70 (62 kW) is the largest unit that bridges to significant construction-grade capacity in a still-compact trailer. The HRIW-125 (110 kW) is the series flagship for substantial temporary power requirements.
Voltage and phase: The HRIW-25 through HRIW-70 support 120/240V, 208V, and 480V in both single- and three-phase configurations — flexible for the mixed electrical services encountered on small and mid construction sites. The HRIW-125 adds 277/480V three-phase. Confirm the site's service requirement before dispatch.
Tow vehicle: The compact HRIW units are designed for pickup-class tow vehicles. The HRIW-125, at 110 kW, is heavier than the lower models — verify tow vehicle GVWR and trailer tongue weight capacity.
Common Applications#
- Construction site temporary power: All four models are rated for construction deployment. The HRIW provides compact, Tier 4 Final compliant diesel power for California job sites where the footprint and tow requirements of a large trailer are impractical.
- Rental fleet (compact tier): The HRIW fills the compact end of rental generator fleets, serving customers who need towable power in the 20–110 kW range for events, small projects, and emergency rentals.
- Temporary power: General temporary power for events, construction trailers, remote facilities, and emergency response scenarios where a small, self-contained diesel trailer is the right tool.
Service & Maintenance#
All four HRIW models share: oil and fuel filter changes at 250 hours or 6 months; air filter at 500 hours. The 6-month time interval ensures service even during low-utilization periods between rental deployments.
Three failure modes are consistent across the series. Trailer couplers experience wear from the repeated hookup and release cycles typical of active rental service — grease and inspect the coupler before each deployment. Fuel filters are contaminated by portable job-site fueling; change at the 250-hour interval and shorten this for units serving sites with suspect fuel supply. Starting batteries deep-discharge during storage between deployments — keep a battery maintainer connected at the rental yard whenever a unit is not in active service to eliminate dead-battery service calls.