A dependable camper van setup starts with a realistic picture of how you’ll travel. List the appliances you intend to use, estimate how much water you need between refills, then check that the batteries, tanks and equipment still leave enough payload for people and luggage. Power, water and weight are linked: a larger battery or full tank can make a trip more comfortable while using capacity needed elsewhere. Plan these systems together, using your vehicle’s actual limits rather than a conversion’s appearance or a brochure estimate. A short test trip with the van loaded as you expect to travel can reveal gaps before they become inconvenient.
Before choosing batteries, solar panels or tanks, write down what the van must do. A weekend of powered-site camping has different requirements from several nights away from mains power. The same applies to water: a van used mainly for sleeping may need less onboard storage than one where cooking, washing and showers all happen inside.
List each appliance and how often you expect to use it. Include less obvious loads such as phone charging, lights, a water pump and ventilation, not just the equipment that feels essential. For water, note drinking, cooking, washing and any other planned use. Be realistic about which activities could be done at a campsite instead.
This list becomes the basis for every purchase. If a device’s real-world energy use is uncertain, check the manufacturer’s information or measure its consumption where practical. A rating on a label can help with an estimate, but how long and how often a device runs matters too.
Begin with energy demand, not a battery advertised as “large” or a solar panel that looks generous on the roof. For a simple estimate, multiply an appliance’s power in watts by the hours it operates to get watt-hours. For example, a 40-watt device used for six hours would use 240 watt-hours before accounting for conversion losses or other system demands. For devices that cycle on and off, use a credible daily consumption estimate rather than assuming they draw their full rated power continuously.
Add the daily estimates for the appliances you expect to use at the same time. Then decide how many days of use you want to cover before recharging. Battery capacity, usable capacity, charging losses and temperature can all affect what the system delivers, so compare the manufacturer’s guidance and allow for the demands of the full setup. A battery’s headline capacity does not necessarily equal the energy you can use without restriction.
| Power approach | Best suited to | Main advantage | Limitation to plan for |
|---|---|---|---|
| Portable power station | Simple setups, occasional trips or people who want a removable unit | Can reduce the need for a permanently installed system | Capacity, charging options and available outputs may not suit every appliance or longer trip |
| Installed 12V system | Regular travel and equipment designed to run from a vehicle-style supply | Can integrate fixed loads, batteries and charging sources | Needs careful design, safe wiring and space for components |
| System with an inverter | Travellers who have a genuine need for selected AC appliances | Can supply AC to compatible devices | Conversion losses and high-draw appliances can increase battery demand substantially |
These approaches can overlap: an installed system may include an inverter, while a portable unit may have different output options. Choose around the appliances you will actually carry. If a device is available in a 12V version, compare its demand with an AC version before adding an inverter just to power it.
Solar can help replenish a battery, but its contribution varies with conditions, panel placement, shading, season and available daylight. Treat it as one charging source rather than a guarantee that the van will remain self-sufficient. Roof space may also be needed for ventilation, storage or other equipment, so check the layout before buying panels.
Charging while driving can suit people who move regularly between stops. The charging equipment must be compatible with the vehicle and the battery system; have the design checked by a qualified installer if you’re unsure. Mains charging is useful when staying at powered sites, but it doesn’t make an undersized battery adequate for stretches without access to a socket.
Fixed electrical equipment, high-current wiring and mains connections deserve particular care. Incorrect cable sizing, inadequate protection or poor connections can create a fire or equipment hazard. Use components appropriate to the system and get qualified help where the installation is beyond your experience. For a converted van in New Zealand, also confirm that the conversion and its equipment meet requirements that apply to the specific vehicle.
Estimate water use by activity and by the longest likely interval between reliable refill opportunities. Drinking and cooking are different from washing up or showering, and the balance depends on your habits and access to facilities. A fixed tank is convenient, but filling it for every journey can add weight you don’t need.
Water is heavy: one litre weighs about one kilogram, before counting the tank, plumbing or pump. A tank holding 40 litres of water therefore adds roughly 40 kilograms of water to the load. The figure is an illustration, not a recommended tank size. Choose capacity to fit your actual use, refill options and vehicle payload.
| Water arrangement | Useful when | Trade-off |
|---|---|---|
| Portable containers | Water use is modest or needs vary between trips | Easy to adjust, but containers need to be secured and handled when refilling |
| Fixed tank and pump | Regular use of an onboard sink or similar fixture | Convenient at camp, but tank, water and plumbing occupy space and add weight |
| Mixed arrangement | You want a small onboard supply plus extra capacity only for some trips | Flexible, but all containers still need safe storage and their full weight counts when loaded |
For a fixed system, plan the tank, fill point, vent, drain, pump and accessible connections as one layout. Use materials intended for potable water where the supply is for drinking, and follow the equipment maker’s cleaning and maintenance instructions. Make sure you can inspect connections for leaks; a slow leak hidden behind cabinetry can damage the interior as well as waste water.
Think through wastewater before installing a sink or shower. Carrying used water adds to the load, and disposal needs to follow the rules of the place where you’re camping. Don’t assume that a convenient drain or roadside stop is an acceptable disposal point. If a full wastewater system doesn’t suit your trips, simpler water use and appropriate facilities may be a better fit.
A conversion can look finished and still be too heavy once it carries people, water and trip gear. Use the vehicle’s documentation and compliance information to identify the applicable gross vehicle mass and axle limits. Published payload figures can be difficult to apply to a modified van because equipment and conversion work change the actual load. The useful number is the capacity remaining in your completed vehicle, loaded for travel.
Make a load list that includes fixed and removable items:
Water is an easy item to overlook because it may be added shortly before departure. Batteries, fridges, awnings and roof racks are less obvious once they become part of the van. Keep a record of changes as you build the setup, then weigh the vehicle in its normal travel condition. If possible, obtain axle readings as well as a total: a van can be within its overall limit while carrying too much on one axle.
Place heavy equipment securely and consider how its position affects axle loads and handling. A tank mounted far behind an axle, for example, can affect load distribution differently from one positioned nearer the centre of the vehicle. Don’t assume that the floor, cabinetry or a DIY bracket can safely support a full tank or battery. Confirm mounting strength and placement with a suitable professional when needed.
If the van will tow a camper trailer, account for the trailer and towing connection separately. The tow vehicle’s capacity, combined vehicle limits and the downward load at the coupling may all affect what the van can carry. Check the specifications for the particular van and trailer rather than relying on a general towing figure.
This sequence helps avoid a common expensive mistake: buying equipment first and discovering later that it takes space, adds too much weight or requires more power than the rest of the system can supply. If the load is too high, reducing stored water, choosing fewer appliances or removing unnecessary gear may be safer than trying to solve the problem with a larger vehicle battery or suspension changes alone.
There isn’t one suitable capacity for every van. Add the expected energy use of your appliances, decide how long you need to operate between charging opportunities, and account for usable battery capacity and system losses. Your camping pattern and the appliances you choose determine the result.
No. Solar is useful when it fits the roof, itinerary and electrical demand, but it isn’t the only way to recharge a battery. Mains charging, charging while driving or a combination may suit some trips better.
Each litre of water adds about one kilogram, in addition to the weight of the tank or container. Include full onboard tanks and any extra containers in your travel load calculation, as well as wastewater carried onboard.
A fixed tank suits regular use of an onboard sink or pump-fed fixture, while portable containers make it easier to vary the amount of water carried. Choose based on convenience, refill habits, storage space and the weight you can carry.
Weigh it after conversion and again when loaded for a typical journey. Include occupants, fuel, water and usual equipment, and seek axle readings where available. Recheck after substantial changes such as adding a battery, roof equipment or storage.
A good camper van setup meets your practical needs while staying within the vehicle’s limits. Start with real power and water use, choose equipment that fits those needs, and check the van’s loaded weight rather than relying on estimates alone. Before committing to a long journey, test the systems with the van packed as you’ll use it and adjust anything that proves excessive, inconvenient or difficult to maintain.
