Everything You Need To Know About Your Caravan’s Power, Water & Gas

Your caravan’s power, water, and gas systems are the foundation of comfortable off-grid living. Understanding how these systems work, how to maintain them, and when to upgrade will make the difference between a smooth Big Lap and constant frustration at remote camps.

This guide covers everything you need to know about your caravan’s essential utilities. We’ll walk through how each system works, common problems you’ll encounter, and the upgrades worth considering before you hit the road.

Power Systems: 12V, 240V & Solar

Your caravan runs on two electrical systems: 12V DC for lights, pumps, and fans, and 240V AC for appliances like microwaves and air conditioners. Understanding both systems helps you manage power consumption and stay off-grid longer.

12V DC System

The 12V system powers your essential services. Your caravan battery (typically 100-200Ah AGM or lithium) stores power that’s consumed by LED lights, water pump, exhaust fans, fridge (on 12V mode), and control panels.

Most caravans come with a single 100Ah AGM battery, which provides roughly 50Ah of usable power before risking damage. That’s enough for basic lighting and water pumps but won’t run a compressor fridge or inverter for long.

240V AC System

The 240V system only works when you’re plugged into mains power or running a generator/inverter. It powers your microwave, air conditioner, power outlets, and battery charger.

Your caravan’s 240V circuit includes an RCD safety switch, power outlets, and a battery charger. When connected to mains power, the charger automatically tops up your 12V battery.

Solar Power

Solar panels charge your 12V battery during daylight hours. A basic 160W panel produces about 8-10Ah per hour in good sunlight, or roughly 40-80Ah per day depending on weather and season.

Your solar setup includes panels, a charge controller (PWM or MPPT), and wiring to the battery. The charge controller prevents overcharging and manages power flow.

Water Systems: Fresh, Grey & Black

Your caravan’s water system includes fresh water storage, a 12V pump for pressurised supply, and waste water collection. Understanding tank capacities and consumption rates helps you plan longer stays between dump points.

Fresh Water

Most caravans carry 80-120 litres of fresh water in a poly tank underneath the van. A 12V pressure pump delivers water to taps, shower, and toilet at household pressure (around 20-30 PSI).

The system includes a pump switch, accumulator tank to reduce pump cycling, and pressure switch. When you open a tap, dropping pressure triggers the pump to maintain flow.

Average consumption runs 20-40 litres per person per day, depending on shower habits and washing up. A family of four typically uses 100-150 litres daily with normal usage.

Grey Water

Grey water from sinks and shower drains into a separate tank, usually 60-80 litres capacity. This tank needs regular emptying at dump points or approved disposal areas.

Grey water tanks fill faster than you’d expect. Doing dishes and showering can fill a tank in 2-3 days for a couple, less for families.

Black Water (Toilet Waste)

Toilet waste goes into the black water tank, typically 80-100 litres capacity. This tank requires emptying at designated dump points only.

Cassette toilets use a removable tank (17-20 litres) that you empty manually. Fixed black water tanks need a sewer hose connection at dump points.

Gas Systems: LPG Storage & Appliances

LPG (liquefied petroleum gas) powers your hot water system, stovetop, oven, and often the fridge. Most caravans carry two 9kg gas bottles, providing 3-6 weeks of typical usage for a couple.

Gas Storage & Regulation

Gas bottles mount in a dedicated compartment with ventilation to outside air. An automatic changeover regulator switches between bottles when one empties, ensuring continuous supply.

The regulator reduces bottle pressure (800+ kPa) down to appliance pressure (2.75 kPa). This consistent low pressure ensures safe, reliable operation of all gas appliances.

Gas Appliances

Your gas hot water system typically provides instant hot water with a 16-26 litre per minute flow rate. The stovetop and oven operate like household appliances but require manual lighting or piezo ignition.

Three-way fridges can run on gas when you’re off-grid. Gas mode is less efficient than 12V or 240V but works independently of your electrical system.

Monitoring Your Systems

Knowing your tank levels, battery voltage, and gas remaining prevents unpleasant surprises at remote camps. Most caravans include basic monitoring, but aftermarket upgrades provide much better information.

Basic Monitoring

Standard caravan control panels show water tank levels, battery voltage, and pump operation. These basic systems often use simple LED indicators that aren’t very accurate.

Tank level sensors can stick or give false readings, especially fresh water sensors that rely on probes inside the tank. Battery voltage displays show current voltage but don’t indicate remaining capacity.

Advanced Monitoring Options

Aftermarket monitoring systems provide much more detail. Battery monitors track amp-hours in and out, giving accurate remaining capacity. Digital tank level systems use ultrasonic sensors for more reliable readings.

Smart monitoring systems connect to smartphone apps, letting you check levels from outside the van or track consumption over time.

Essential Maintenance Tasks

Regular maintenance prevents system failures and extends equipment life. Most tasks are simple but critical for reliable operation during extended travel.

Electrical System Maintenance

Check battery terminals monthly for corrosion and clean with bicarbonate of soda if needed. Test battery voltage regularly and ensure it reaches 12.6-12.8V when fully charged.

Clean solar panels weekly to maintain output. Dust and dirt can reduce efficiency by 20-30%. Check all 12V connections for corrosion, especially in the battery compartment.

Water System Maintenance

Sanitise your fresh water system every 3-6 months using unscented bleach. Fill the system with a weak bleach solution, let sit for 30 minutes, then flush thoroughly with fresh water.

Replace water filter cartridges every 3-6 months or as manufacturer recommends. A clogged filter reduces water flow and pump life.

Gas System Maintenance

Check gas fittings annually for leaks using soapy water. Look for bubbles around connections, especially after the van has been moved or serviced.

Clean burner holes on your stovetop regularly. Blocked holes cause poor flame patterns and inefficient burning. Use a small wire to clear any blockages.

Worth-It Upgrades for Extended Travel

Some upgrades significantly improve comfort and self-sufficiency for Big Lap travel. Focus on upgrades that solve real problems or extend your off-grid capability.

Power Upgrades

Lithium batteries are the best single upgrade for most travellers. A 200Ah lithium battery provides the same usable power as 400Ah of AGM batteries but weighs half as much and lasts 5-10 times longer.

Additional solar panels extend charging capability. Most caravans have room for 400-600W of panels, providing 150-300Ah daily in good conditions.

A quality inverter lets you run 240V appliances off battery power. A 2000W pure sine wave inverter can power most appliances except air conditioners.

Water Upgrades

Larger fresh water tanks (150-200L) extend time between fills. Aftermarket tanks often fit in unused storage areas underneath the van.

Water filtration systems improve taste and safety. A two-stage system with sediment and carbon filters handles most Australian water quality issues.

Gas Upgrades

Larger gas bottles (20kg or 45kg) reduce refilling frequency. Check your van’s gas compartment can accommodate larger bottles and that payload allows the extra weight.

External gas bayonets let you connect portable appliances like BBQs without disconnecting internal supply.

Common Problems & Solutions

Understanding common system problems helps you diagnose issues quickly and avoid unnecessary service calls on the road.

Electrical Problems

No 12V power usually means a blown fuse or flat battery. Check the main fuse first, then individual circuit fuses. If fuses are good, test battery voltage with a multimeter.

Lights flickering or dimming indicates voltage drop from poor connections or low battery. Clean all battery terminals and check wire connections for corrosion.

Solar not charging can be caused by shading, dirty panels, or faulty charge controller. Check panel output with a multimeter in full sunlight.

Water Problems

No water pressure usually means pump failure, blown fuse, or empty tank. Check tank level first, then pump fuse. If both are good, the pump may have failed or lost prime.

Low water pressure can indicate a clogged filter, leak, or failing pump. Replace filters first, then check for visible leaks around fittings.

Pump cycling constantly suggests a leak in the pressurised system or failed accumulator tank. Check all fittings and replace the accumulator tank if needed.

Gas Problems

No gas flow typically means empty bottles or regulator failure. Check bottles are open and have gas remaining. If bottles have gas but appliances won’t light, the regulator may need replacement.

Poor flame quality suggests blocked burners or low gas pressure. Clean burner holes and check gas bottle levels. Overfilled bottles can cause pressure regulation problems.