Battery Compliance & Why Chassis-Mount Is Becoming Standard Practice in the OEM Industry

For decades, caravan batteries lived where there was spare space — under a bench seat, in a cupboard, wherever the build allowed. That approach is changing fast. Across the Australian caravan and RV industry, chassis-mount battery systems are moving from a premium option to standard engineering practice, and compliance is a big part of why.

What "Chassis-Mount" Actually Means

A chassis-mount battery isn't installed inside the caravan at all — it's bolted directly to the steel chassis rails underneath the floor, alongside the vehicle's structural frame. It's a fundamentally different engineering approach to where a battery lives, not just a repackaged version of the same battery.

AS/NZS 3001.2:2022 — The Standard That Changed the Industry

Since 18 November 2023, new recreational vehicle electrical installations in Australia and New Zealand must comply with AS/NZS 3001.2:2022 — Electrical installations — Connectable electrical installations and supply arrangements, Part 2: Connectable electrical installations. Developed with input from Engineers Australia, Master Electricians Australia, and the Caravan Industry Association of Australia, it superseded the older AS/NZS 3001:2008 standard.

The standard sets specific requirements for how batteries are installed in RVs, including:

• Protection against harmful gas build-up, fire, water ingress, and physical impact
• Defined clearance zones around battery terminals
• A spill tray able to hold at least 20% of the battery's electrolyte volume
• Communication between the Battery Management System and the vehicle's battery monitor/display
• Solar and inverter integration requirements, including DC isolation and earth bonding for higher-voltage arrays

OzX DCX batteries are certified to AS/NZS 3001.2:2022, in addition to UL1973:2022 and IP67 ingress protection — a genuinely different compliance position to a battery that's simply been repackaged into an external enclosure without being engineered against this standard from the start.

Compliance: The Standards Behind the Shift

Lithium battery systems built for chassis-mount installation are held to a higher engineering bar than internally-stowed batteries, because they're exposed to road vibration, moisture, dust, and temperature extremes that an internal cupboard installation never sees. Every DCX battery also runs a multi-layer Battery Management System (BMS), providing overcharge, over-discharge, thermal, and short-circuit protection. For an OEM caravan manufacturer, specifying a chassis-mount system with this level of certification and protection is a straightforward way to de-risk a build against battery-related warranty claims and safety incidents.

Why OEMs Are Making the Switch

Low Centre of Gravity

Mounting the battery low and within the chassis — rather than up in a cupboard — lowers the caravan's overall centre of gravity. For a vehicle that's towed at highway speed, on corrugated roads, and through crosswinds, this isn't a minor detail. It directly affects towing stability and how the van behaves at speed.

Improved Weight Distribution

A chassis-mounted battery sits closer to the axle line than a cupboard-mounted equivalent, which helps manufacturers manage payload and weight distribution more precisely — a genuine engineering constraint every caravan builder has to solve for.

Reclaimed Internal Space

Every cupboard, bench, or wardrobe that doesn't need to house a battery is space returned to storage or living area. For manufacturers competing on internal layout and liveability, this is a real product differentiator.

Proven in the Field

OzX chassis-mount technology is already running in the field with 40+ Australian RV manufacturers, and DCX-powered builds have been recognised twice at Caravan of the Year level. This isn't an emerging, unproven approach — it's already operating at scale across the industry.

What This Means If You're Specifying a System

If you're an OEM manufacturer evaluating power systems for a new build, the questions worth asking any battery supplier are straightforward: is it certified to AS/NZS 3001.2:2022, what other certification does it hold, what's the IP rating of the enclosure, and what protection layers does the BMS provide? A chassis-mount system that can't answer these clearly isn't solving the problem chassis-mount is meant to solve.

Frequently Asked Questions

Is AS/NZS 3001.2:2022 compliance mandatory?
Yes — it applies to new electrical installations in recreational vehicles built after 18 November 2023. It replaced the older AS/NZS 3001:2008 standard after a 12-month transition period.

What certification should I look for in a chassis-mount battery?
At minimum, ask for AS/NZS 3001.2:2022 compliance for Australian RV installations, the battery's UL certification (OzX DCX batteries are UL1973:2022 certified), its IP rating for dust and water ingress, and details on its BMS protection layers.

Does chassis-mount installation cost more than internal installation?
The battery and mounting hardware are engineered specifically for external, vibration-exposed conditions, which reflects in the build. The trade-off is reclaimed internal space and improved towing stability that an internally-stowed battery can't offer.

Can any lithium battery be chassis-mounted?
No — a battery needs an appropriate IP rating, enclosure design, and AS/NZS 3001.2:2022 compliance to survive direct exposure to road spray, dust, and vibration while meeting Australian installation requirements.

How does chassis-mount affect towing stability specifically?
Mounting weight low and within the chassis lowers the caravan's centre of gravity compared to a cupboard-mounted battery higher in the body, which improves stability at highway speed and in crosswinds.

Talk to our OEM team about integrating chassis-mount DCX systems into your next build, or explore the full DCX battery range built for exactly this kind of installation.