The Grenadier's 230V/120V factory inverter is 400W continuous — enough for laptops, CPAPs, and Starlink, but only while the engine runs. Here's what owners need to know about activation, Chassis Cab installation, and the six-test validation protocol.
Quick Answer: INEOS Grenadier HVPO
- Engine must be running — the 230V/120V outlets don't work with ignition off; unlike 12V sockets, the HVPO inverter requires alternator input
- 400W continuous limit — laptops, CPAPs, Starlink, and drone chargers yes; kettles, hair dryers, and microwaves no
- Activate via overhead console switch — the power button in the overhead console controls both the 12V outlets and enables HVPO operation
- Chassis Cab installation only — standard Grenadier HVPO arrives pre-wired; Chassis Cab variant ships with harness in a bag, right-side cable routing required
The Engine-Running Requirement
New owners discover this quickly. The 230V and 120V outlets only energise when the engine is running and the alternator is charging. The overhead console power switch controls whether the 12V auxiliary sockets operate without ignition — but it does not enable the HVPO without engine input.
This is a deliberate design choice. A 400W inverter drawing from the auxiliary battery would drain it within a few hours of stationary use. INEOS designed the HVPO for travel use, not base-camp power.
What Owners Report
"The 2x 230V sockets in my Grenadier — how do I get them to provide power? They only seem to work with the engine running."
— Grenadier owner on The INEOS Forum, August 2024
"I tried the power switch in the overhead console — the 12V in the back needs the switch flicked, but the 230V sockets just don't work without the engine running. That really is quite the bummer."
— Owner confirming engine-running requirement, The INEOS Forum
"I have a 1200 Watt power station in the back to run my fridge, recharge my GoPro, drone, and e-bike. To charge through the inverter outlet, the power station draws 1200 watts, so that's out."
— Grenadier owner on The INEOS Forum, Power Take-Off Q&A
For extended stationary use, owners combine a portable power station (charged via the 12V outlet while driving) with the HVPO for light loads while moving. This keeps the factory system within spec while providing camp capacity.
Load Capacity: What the HVPO Can and Cannot Run
The factory HVPO provides a 230V/120V AC outlet rated at 400W continuous. That limit is total system capacity — not per-outlet. Running two 250W devices simultaneously will trip the overcurrent protection.
| Appliance | Typical Draw | HVPO Compatible? |
|---|---|---|
| Laptop charger | 60–100W | Yes — well within limits |
| Phone/tablet charging (multiple) | 20–60W total | Yes |
| LED work light | 30–100W | Yes |
| CPAP machine | 30–60W | Yes — popular use case for overlanders |
| Drone charger | 60–100W | Yes |
| Starlink Mini router | 50–75W | Yes — see Starlink Mini roof mount guide |
| Portable 12V fridge (via AC adapter) | 40–80W | Marginal — better to run direct from 12V |
| Portable power station (charging) | 200–1,200W | Only if input charge rate limited to <350W |
| Hair dryer | 1,000–1,800W | No — will trip immediately |
| Electric kettle | 1,500–2,000W | No — far exceeds capacity |
| Microwave | 700–1,200W | No — even a small microwave exceeds 400W |
| Power tools (drill, grinder) | 500–1,500W | No — startup surge alone will trip it |
| Induction cooktop | 1,000–2,000W | No |
The rule of thumb: if it heats, it's probably too much. Heating elements are the most power-hungry appliances. The HVPO is designed for electronics and low-draw devices, not resistive loads.
Startup Surge Warning
Many appliances draw 2–3× their rated wattage on startup. A device rated at 300W may surge to 600–900W when first plugged in. The HVPO's overcurrent protection will trip, and you'll need to cycle the overhead console switch to reset it. Check the appliance's inrush current rating, not just its running wattage — compressor fridges are the most common trigger.
Chassis Cab Installation: The Hardware & Routing
On the Chassis Cab variant, INEOS supplies the HVPO harness pre-assembled but uninstalled. You'll find a blanking grommet sealed into the Body-In-White. The installation job: pull the cable through, establish proper grounding, and secure the socket flush to your chosen surface.
Cable length is fixed at 1.7 metres from the earth fixation point. That constraint defines your socket placement options. The cable must route on the right-hand side of the vehicle only — owners who route left run out of cable and cannot extend it without voiding the installation.
Installation Specifications
- Cable routing: Right-hand side of vehicle only
- Cable length: 1.7m from earth fixation point
- Fuel line clearance: Minimum 150mm
- Socket clearance boundary: 30mm in all directions
- Socket orientation: Vertical or negative inclination (tilted downward, to allow water escape)
- Environmental rating: IP66k (with lid closed)
- Ground torque: 20.0 ±2 Nm
- Grounding: Bare metal on bare metal — do not splice with other loads
Common Installation Mistakes
Forum reports and dealer service logs reveal the same mistakes repeated across Chassis Cab installations:
Mistakes That Will Cost You Time or Money
- Routing the cable on the left side: The cable must route right-hand side to reach the earth fixation point. Owners who route left run out of cable length and try to extend it — which voids the installation entirely.
- Splicing the ground with other accessories: The HVPO ground must be dedicated. Sharing a ground path with other loads introduces noise and can cause the inverter's earth leakage test to fail. One forum owner reported intermittent inverter shutdowns traced to a shared ground with an aftermarket fridge.
- Mounting the socket facing upward: The socket must be vertical or tilted downward. An upward-facing socket collects water, and even with the IP66k cap closed, repeated water pooling accelerates seal degradation.
- Skipping the six-point validation test: "It turned on, so it works" is not validation. Earth loop impedance and insulation resistance failures are invisible until something goes wrong — and "something wrong" with 230V AC means fire or electrocution risk.
- Not accounting for trim panel reinstallation: Owners budget time for the electrical work but forget they need to remove and replace C-pillar, entrance trim, and rear bulkhead panels. Forcing panels back over improperly routed cables creates pinch points that damage insulation over time.
- Using the HVPO while engine is off for extended periods: The inverter draws from the auxiliary battery. Without the engine running, you'll drain the auxiliary battery. Extended use at camp requires the engine running or an independent secondary battery system.
Water Ingress and Environmental Rating
The protective housing and cap are IP66k rated when the lid is closed. If you're mounting in a wet area — and you likely are — use the provided protective housing and cap. The IP66k rating covers high-pressure water jets, which covers most off-road wash-down scenarios.
To activate the inverter: flip the power switch in the overhead console with the engine running. The socket will not energise with just the ignition on.
Grounding Requirements
The cable must be installed on the right-hand side of the vehicle to reach the earth fixation point. Maintain minimum 150mm clearance between cable and fuel lines.
Grounding requires bare metal on bare metal contact. Do not splice the ground with other loads. The ground path must connect the chassis frame to any rear attachments. Torque spec: 20.0 ±2 Nm. Eyelet stacking is acceptable on ground studs.
Trim Panel Removal
Installation demands removal of multiple trim panels: C-pillar upper and lower, entrance trim, and rear bulkhead. Account for this in labour planning — owners consistently underestimate this phase. Forcing panels back over improperly routed cables creates insulation pinch points that surface as faults months later.
Validation Testing: Six Tests Required
Before the job is complete, six tests are mandatory. This isn't bureaucracy — it's the difference between a working inverter and a 230V fire hazard.
| Test | Purpose |
|---|---|
| Polarity Test | Confirm correct positive/negative termination |
| Earth Continuity | Verify ground path integrity |
| Insulation Resistance | Check insulation between conductors |
| Earth Leakage | Measure current leaking to ground |
| Earth Loop Impedance | Verify fault loop for protection devices |
| Functional Test | Confirm operation under load |
If any test fails, the socket isn't live until it passes. Earth loop impedance and insulation resistance failures are invisible until something goes wrong.
DVA Grenadier Accessories
If you're building out your Grenadier for overlanding, the HVPO pairs well with roof-mounted connectivity and lighting upgrades from DVA Mechanics.
- Starlink Mini Roof Mount Guide for INEOS Grenadier — no-drill DualTrack mount, cable routing and seal protocol for the Starlink Mini that runs on the HVPO
- Grenadier EXT & INT Auxiliary Power: 7-Circuit Engineering Guide — if you need more than 400W, the 7-circuit EXT/INT system is where to start
- INEOS Grenadier Accessories — DVA Mechanics — roof rail systems, crossbars, utility belt accessories, and lighting kits purpose-built for the Grenadier
