Off-grid van living isn’t camping without hookups. It’s a deliberate system designed to give you independence: power from the sun, water from storage, and the ability to stay somewhere for weeks without needing external utilities. Building for actual off-grid use requires thinking through several interconnected systems.

Power System: Solar and Battery

The core of any off-grid build is the electrical system. You need solar panels to generate power, batteries to store it, and a charge controller to manage the flow.

Solar panels: Most vans can handle 400-600 watts of solar on the roof. That’s typically 3-4 standard panels. Higher wattage is possible but hits diminishing returns on a van roof.

In reality, 400 watts of solar on a van generates about 1.5-2.5 kWh per day depending on season and location. In winter or cloudy regions, expect the lower end. In desert Southwest during summer, you’re closer to the high end.

Battery sizing: This depends on how much power you actually use. A Basic build might run 100-150Ah lithium. A Standard build goes 200-300Ah. A Premium off-grid build can be 400Ah+.

Here’s what that actually means:

100Ah lithium gives you roughly 1.3 kWh of usable storage. Enough for lights, some device charging, and basic loads. Heating or cooking (if electric) is not happening.
200Ah is 2.6 kWh. You can run lights, charge devices, run a small fan, and have capacity for cloudy days.
400Ah is 5.2 kWh. You’re running as if you had utilities. Lights, devices, fans, a small heater, some cooking load.

Charge controller: This regulates how solar charges the battery. MPPT controllers are more efficient than PWM controllers. We typically spec MPPT for anything over 300 watts of solar.

The battery bank is the real investment. A 200Ah lithium battery costs $2,000-$3,500 depending on brand and quality. A 400Ah setup is $4,000-$7,000+. But it’s built to last 10+ years and handle thousands of charge cycles.

Water System: Fresh Water and Grey Water

Off-grid living means you carry water. You need to store it, use it efficiently, and manage waste.

Fresh water tank: Size depends on usage and how often you want to refill.

A couple using water conservatively (quick showers, minimal cooking) uses about 5-10 gallons per day. That means a 50-gallon tank gets you a week off-grid. A 100-gallon tank gives you two weeks. A 150-gallon tank is three weeks.

Tank placement matters. We typically use food-grade poly tanks mounted low and centered for weight distribution. Under-bed mounting is common.

Grey water tank: This captures sink and shower water. Sizing mirrors your fresh water tank, but you might use less grey water capacity if you dump it more frequently.

Plumbing setup: Pressure pump pushes water from the tank to fixtures. A simple on-demand pump works fine for Basic builds. For longer off-grid stays, a pressurized system is more comfortable.

Hot water can come from a simple propane water heater (most efficient for off-grid) or an electric demand heater (requires significant battery capacity).

Heating and Ventilation

Off-grid often means staying in cooler climates or winter months. You need heating.

A propane heater (like an Espar) is the standard for vans. It uses minimal battery power and propane to heat efficiently. Most vans run a 30-pound propane tank, which heats for weeks in mild conditions or several days in freezing temperatures.

Ventilation matters because moisture is the enemy. A roof vent (powered or passive) keeps air moving. Some vans add a second vent or window for cross-ventilation.

Propane System

Propane handles heating, cooking, and sometimes water heating. A basic propane system includes a tank, regulator, and lines to appliances.

A 30-pound tank is standard. It lasts weeks depending on heating and cooking use. Some Premium builds use two tanks for redundancy.

Putting It Together: Three Off-Grid Scenarios

Scenario 1: Weekend off-grid camping (Basic)

100-150Ah battery
300-400W solar
50-gallon fresh water, 40-gallon grey water
Propane heater and cooking
Simple ventilation

Cost: $15K-$25K. Use case: weekend trips, established campgrounds, predictable routes.

Scenario 2: Multi-week off-grid trips (Standard)

200-300Ah battery
400-500W solar
80-100 gallon fresh water, 60-80 gallon grey water
Propane heating and water heater
Better ventilation, quality appliances

Cost: $35K-$50K. Use case: road trips lasting weeks, remote camping, seasonal migration.

Scenario 3: Long-term off-grid living (Premium)

400Ah+ battery
600W solar or more
100-150 gallon fresh water, 80-100 gallon grey water
Propane heating and water heater, quality appliances
Integrated HVAC and ventilation

Cost: $65K-$95K+. Use case: months-long trips, full-time living, minimal utility access.

System Efficiency and Real Usage

Off-grid success requires realistic expectations about power.

Let’s say you have a 200Ah battery and 400W solar. On a sunny day, you generate maybe 1.6-2 kWh. You’re using:

LED lights: 10-20W per bulb, maybe 4-5 hours = 0.04-0.1 kWh
Fridge: 50W average, 24 hours = 1.2 kWh
Fans, charging devices: 0.3 kWh
Other loads: 0.2-0.3 kWh

Total: roughly 1.9-2.1 kWh per day. On a sunny day, your solar exactly covers your usage. On cloudy days, you’re drawing from battery.

This is why battery size matters. A cloudy week with a small battery means no fridge, minimal lighting, and stressed power management. A larger battery means you’re comfortable during weather.

Building for Off-Grid: Questions to Ask Yourself

How many weeks do you want to stay without resupply?
What’s your cooking method? Propane is off-grid. Electric induction requires significant power.
Do you need hot water, or can you manage showers?
What’s your heating need? Winter in Montana is different from winter in Southern California.
Are you solo or with a partner? Water usage scales.

The right off-grid system depends on your actual use pattern, not generic recommendations.

When to Call a Professional

Off-grid systems are interconnected. If you undersize the battery, you limit what the solar can do. If you oversize the battery, you’re carrying unnecessary weight. If your water consumption exceeds your tank capacity, your whole plan fails.

We design off-grid systems based on your actual planned usage, climate, and season of use. We spec every component to work together, test it before you take delivery, and walk you through power management so you understand how to live within your system’s capability.

If you’re serious about building an off-grid van and want help designing a system that actually works for how you plan to travel, let’s talk. We’ll design something realistic for your situation.

Off-Grid Van Conversion Guide