How many solar panels do I need for a camper van?

Most camper vans need 400-800W of solar, which is 2-4 x 200W panels or 1-2 x 400W panels. The exact number depends on your daily energy use (typically 2-4 kWh/day) and your location's peak sun hours. A minimalist setup (fridge, lights, phone) needs 400W. A full setup with laptop, fan, and TV needs 600-800W.

Can I run AC in a camper van with solar?

Not practically. Even a small 5,000 BTU portable AC draws 500-600W continuously, consuming 4-5 kWh in 8 hours of use. That alone would require your entire solar budget plus a massive battery bank. Most van lifers use a MaxxAir or similar roof fan (30-40W) and park in shade instead. If you must have AC, plan on shore power or a generator for those days.

Should I use rigid or flexible solar panels on a van?

Rigid panels are more efficient, last longer (25+ years vs 5-10 years), and run cooler because they mount with an air gap. Flexible panels conform to curved roofs and add no height — important for stealth vans or low-clearance parking. For most builds, rigid panels on tilt mounts or Z-brackets are the better long-term investment.

How big of a battery do I need for van solar?

A 200Ah 12V LiFePO4 battery (2,560 Wh usable) covers 1-2 days of typical van use (2-3 kWh/day) without sun. For heavier use or extended cloudy periods, upgrade to 300-400Ah. Always use LiFePO4 over AGM — it provides 100% usable capacity vs 50%, weighs half as much, and lasts 3,000-5,000 cycles vs 500.

Do I need an MPPT or PWM charge controller for a van?

MPPT, always. An MPPT controller extracts 25-35% more energy from your panels than PWM, especially in cool or cloudy conditions. For a typical 400-800W van system on 12V, a 30-40A MPPT controller like the Victron SmartSolar 100/30 or Renogy Rover 40A is the right size.

How much does a complete van solar system cost?

A basic 400W system (2 x 200W panels, MPPT controller, 200Ah LiFePO4 battery, wiring) costs $1,500-$2,000. A full 800W system with a 300Ah battery bank and 2,000W inverter costs $3,000-$4,000. Most van lifers DIY the installation, saving $500-$1,000 in labor.

Can I charge my van battery while driving and from solar at the same time?

Yes. A DC-DC charger (like the Victron Orion 30A) charges your house battery from the alternator while driving, typically at 30-60A. Solar charges when parked. Most van builds use both — the alternator handles heavy charging on driving days, and solar maintains the battery on stationary days. The two systems work together without conflict.

How Many Solar Panels For A Camper Van? (Complete Van Solar Guide)

A camper van typically uses 2-4 kWh per day for a fridge, lights, phone charging, laptop, and a fan. With only 80-120 square feet of roof space, you can fit 2-4 x 200W rigid panels (400-800W total) or 1-2 x 400W panels. At 5 peak sun hours with the PVWatts derate of 0.83, a 600W system produces about 2.5 kWh/day -- enough for most van lifers.

I built my home solar system in 2024 and learned one thing that applies directly to van builds: size for your actual usage, not for worst-case fantasies. Most van lifers overestimate their needs. A solid 400-600W system with a quality LiFePO4 battery handles everything except air conditioning.

Quick Answer: Van Solar Panel Count

Daily energy use	System size needed	200W panels	400W panels
2 kWh (minimalist)	480W	2-3	1-2
3 kWh (typical)	720W	3-4	2
4 kWh (heavy use)	965W	4-5	2-3

These numbers assume 5 PSH and the PVWatts v8 derate factor of 0.83.

The math:

System watts = daily kWh / (PSH x 0.83) x 1000
Example: 3 kWh / (5 x 0.83) x 1000 = 723W

Try The Calculator

Adjust the panel wattage and your location's peak sun hours to see exact daily production.

Solar panel wattage

Type any value 10–750 W. Common sizes: 100 W (portable), 400 W (residential 2026), 580 W (commercial).

Peak sun hours per day

hrs

Don't know your PSH? Find your exact value →
Benchmarks: U.S. avg 4.98 · Phoenix 6.54 (highest) · Seattle 3.95 · Anchorage 3.17 (lowest). Above ~5.5 = sunny · 4.5–5.5 = average · below 4.5 = cloudy.

Daily kWh production

0.00kWh

Based on a 400W panel and 5.32 peak sun hours per day

Daily

1.60kWh

average across the year

Monthly

48kWh

× 30 days

Yearly

583kWh

× 365 days

Monthly production for a 400W panel — US Average

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

kWh per month · Source: NREL PVWatts v8

216 kg

CO₂ avoided per year

0.05

equivalent US homes powered

trees planted equivalent

$93

estimated annual savings

Tap to see sensitivity analysisSensitivity analysis

Sensitivity range
Scenario	Value
Low (-20%)	1.3 kWh
Expected	1.6 kWh
High (+20%)	1.9 kWh

Your daily production scales linearly with both panel wattage and peak sun hours. A 10% change in either input changes your result by 10%.

See production for your state Try the system size calculator

Van Appliance Energy Use

The first step in sizing a van solar system is adding up your actual daily loads. Here is what typical van appliances draw:

Appliance	Watts	Hours/day	Daily Wh
12V compressor fridge (Dometic CFX)	45	12 (cycling)	540
LED interior lights (4 puck lights)	20	5	100
Phone + tablet charging	15	3	45
Laptop	60	3	180
MaxxAir roof fan	35	8	280
Water pump	60	0.3	18
USB-C accessories	10	2	20
Total (typical)			1,183 Wh

Add a diesel heater controller (50 Wh/night) in winter and a TV/streaming device (180 Wh) if you watch shows, and you are at 1,400-1,600 Wh/day -- call it 1.5-2 kWh for a typical build. Heavier users running an electric cooktop, espresso machine, or hair dryer through an inverter climb toward 3-4 kWh.

Roof Space: The Real Constraint

Unlike a house where you can add panels until you run out of roof, a van has strict space limits:

Van type	Usable roof area	Max panels (200W rigid)	Max watts
Sprinter 144" (short)	60-70 sq ft	2-3	400-600W
Sprinter 170" (long)	80-100 sq ft	3-4	600-800W
Transit 148" (high roof)	70-85 sq ft	3-4	600-800W
ProMaster 159"	85-100 sq ft	3-4	600-800W

Subtract area for roof fans (MaxxAir takes about 2.5 sq ft), antennas, and any roof rack accessories. Most vans realistically fit 600-800W of rigid panels on the roof.

Rigid vs Flexible Panels

This is one of the most debated topics in the van community.

Rigid panels (recommended for most builds):

Higher efficiency (20-22% for monocrystalline)
Last 25+ years with minimal degradation
Mount on Z-brackets or tilt mounts with air gap for cooling
Add 2-3 inches of height to the van
Cost: $0.80-$1.20 per watt

Flexible panels:

Conform to curved van roofs
Add zero height (important for stealth or garage clearance)
Lower efficiency (typically 18-20%)
Shorter lifespan: 5-10 years, sometimes less
Run hotter because they sit flat against the roof with no air gap, which reduces output by 10-15%
Cost: $1.00-$1.80 per watt

For most builds, rigid panels on Z-brackets are the better value. The air gap between panel and roof improves efficiency and extends panel life. Use flexible panels only if height clearance is a hard constraint.

Essential System Components

A complete van solar system includes more than just panels:

Component	Recommended spec	Estimated cost
Solar panels	400-800W total (rigid)	$350-$700
MPPT charge controller	30-40A (Victron, Renogy)	$120-$250
LiFePO4 battery	200-400Ah 12V	$600-$1,800
Pure sine wave inverter	1,000-2,000W	$150-$400
DC-DC charger (alternator)	30A (Victron Orion, Renogy)	$150-$250
Wiring, fuses, bus bars	4 AWG and 10 AWG runs	$100-$200
Mounting hardware	Z-brackets or tilt mounts	$50-$100
Total		$1,520-$3,700

The battery is the most expensive single component. A 200Ah LiFePO4 battery stores 2,560 Wh (all usable), which covers a full day of typical van use with reserve. For extended boondocking in cloudy areas, 300-400Ah gives you a comfortable 2-day buffer.

Sizing By Location

Your location's peak sun hours determine how much energy your panels actually produce. The same 600W system performs very differently in Arizona vs the Pacific Northwest:

Location	PSH	600W system daily output	Covers (kWh/day)
Arizona	6.5	3.2 kWh	Heavy use
Colorado	5.5	2.7 kWh	Typical+ use
US average	5.0	2.5 kWh	Typical use
Pacific NW	4.0	2.0 kWh	Light-moderate use
Winter (northern)	2.5-3.0	1.2-1.5 kWh	Light use only

Daily output = panel watts x PSH x 0.83 / 1000.

Van lifers who travel with the seasons have a major advantage. Following the sun from the Southwest in winter to the Pacific Northwest in summer keeps PSH consistently above 5.

Boondocking Tips for Maximizing Solar

Park strategically. Orient your van so the roof faces south (in the Northern Hemisphere) with no tree shade from 9 AM to 3 PM. This sounds obvious but makes a 20-30% difference in daily production.

Manage loads by time of day. Run heavy loads (laptop, cooking, hair dryer) during peak sun hours when the panels are producing. Let the battery handle only light loads (fridge, fan) overnight.

Use a battery monitor. A Victron SmartShunt or similar gives you real-time state of charge, current in/out, and time remaining. Without one, you are guessing -- and guessing leads to either over-discharging (damaging the battery) or over-building (wasting money).

Consider a DC-DC charger as backup. Even a 2-hour drive with a 30A DC-DC charger puts roughly 70 Ah (840 Wh) into the house battery. On cloudy days, a short drive to a trailhead can supplement your solar.

Budget Breakdown

Budget tier	System	What you get
Budget ($1,500-$2,000)	400W panels, 20A MPPT, 100Ah LiFePO4, no inverter	Lights, fridge, phone, USB charging. No AC outlets.
Mid-range ($2,500-$3,000)	600W panels, 30A MPPT, 200Ah LiFePO4, 1,000W inverter	Full setup: laptop, fan, occasional small appliances.
Full build ($3,500-$4,000+)	800W panels, 40A MPPT, 300Ah LiFePO4, 2,000W inverter, DC-DC charger	Run everything except AC. Multi-day boondocking in any weather.

Start with the mid-range setup. You can always add a second battery or more panels later. Starting too small (100W panel, 100Ah AGM) is the most common mistake -- you will upgrade within 6 months.