Complete Guide to Off-Grid Electrical for Your Camper Van
How to size, design, and install a reliable off-grid lithium electrical system. Components, budget tiers, and the system we install most often.
The single most important system in any van conversion. Get it right and you can disappear for weeks. Get it wrong and you'll be limping back to civilization on day three.
This guide is based on 350+ van builds and our Victron-certified install team.
The 4-Tier Off-Grid System
Tier 1: Weekend Warrior - $3,500 installed
- 100Ah lithium battery (Battle Born or Epoch)
- 200W roof solar
- Victron 100/20 MPPT
- 1000W pure sine inverter
- Smart shunt monitoring
- DC-DC charger from alternator
Powers: lights, vent fan, USB charging, occasional inverter use. 3-4 days off-grid without solar input.
Tier 2: Frequent Adventurer - $7,500 installed
- 200Ah lithium
- 400W roof solar
- Victron 100/30 MPPT
- 2000W Multiplus inverter/charger
- DC-DC charger (60A)
- Smart shunt + Cerbo GX
Powers: everything above + 12V fridge, water pump, occasional induction cooktop. 7-10 days off-grid with solar.
Tier 3: Long-Term Adventure - $14,000 installed
- 400Ah lithium
- 800W roof solar
- Victron 250/60 MPPT
- 3000W Multiplus
- DC-DC charger (60A)
- Cerbo GX with touchscreen
- AC shore power inlet
Powers: everything above + air conditioning (limited), induction cooking, Starlink. 14+ days off-grid in summer.
Tier 4: Full-Time Off-Grid - $22,000 installed
- 800Ah lithium
- 1500W solar (with tilt)
- Multiple Victron MPPT controllers
- 5000W inverter/charger
- Dual DC-DC chargers
- Backup propane generator option
- Full Victron VRM monitoring
Powers: full house - AC, induction, hot water, Starlink, full work-from-van setup. Indefinite off-grid.
Why We Use Victron
After trying every major brand:
- Renogy: budget-friendly but limited monitoring and reliability
- Goal Zero: portable, expensive per kWh, not designed for installed systems
- EcoFlow: great for emergencies, weak for permanent installs
- Battle Born + Victron: the professional standard, what every solar installer uses
Victron components communicate via VE.Direct and VE.Bus protocols, giving you a unified monitoring system on your phone (VRM portal) or a touchscreen Cerbo GX in the van.
Battery Chemistry: Why Lithium
Forget AGM. Lithium iron phosphate (LiFePO4) has won:
- 2x usable capacity (100% depth of discharge vs 50% for AGM)
- 3-5x longer life (3,000-5,000 cycles vs 500-1,000)
- Half the weight for the same capacity
- Stable in heat (BMS protects against thermal runaway)
- Faster charging (accept higher amperage)
The math: a 200Ah lithium = 400Ah of usable AGM. After 5 years, the lithium is still going. The AGM is dead.
Solar Sizing Quick Reference
| Daily Energy Use | Solar Needed (SoCal) | Solar Needed (Pacific NW) |
|---|---|---|
| 50 Ah/day | 200W | 300W |
| 100 Ah/day | 400W | 600W |
| 150 Ah/day | 600W | 800W |
| 200 Ah/day | 800W | 1200W |
| 300 Ah/day | 1200W | 1500W+ |
We always recommend 20% headroom over your calculated need.
Common Mistakes We Fix
1. Under-sized DC-DC charger
A 30A DC-DC charger on a 400Ah lithium will take 13+ hours to fully recharge from the alternator. Use 60A minimum for any battery over 200Ah.
2. Wrong wire gauge
Too-thin wiring causes voltage drop, slow charging, and heat. Use Victron's wire gauge calculator. When in doubt, go up one gauge.
3. No proper fusing
Every battery cable needs an ANL or MEGA fuse within 7 inches of the positive terminal. Skip this and you have a fire hazard.
4. Ground loop / poor grounding
House battery negative must connect to chassis ground at exactly one point with proper gauge. Multiple ground paths = problems.
5. Mixing battery brands or chemistries
Never parallel different brands or different ages of lithium. Inconsistent BMS behavior leads to imbalanced cells.
Our Most Popular System
For the typical full-time van life customer:
- 2x Battle Born 100Ah (or 1x Epoch 200Ah)
- 400W roof solar (3x 130W rigid panels)
- Victron MultiPlus II 12/2000/80
- Victron Smart Shunt 500A
- Cerbo GX with VRM cloud monitoring
- Orion-Tr Smart 12/12-30A DC-DC
Total installed: ~$8,500
Powers everything for most users with reasonable expectations.
What This Looks Like at Vanaholic
When you book an electrical install with us:
- Consultation to size your system based on actual usage
- 3D layout showing where every component goes
- Itemized quote with parts cost transparent
- Build photos documenting every connection
- Victron VRM commissioning so you can monitor remotely
- Walkthrough when you pick up the van
- Comprehensive workmanship warranty
Ready to Talk Electrical?
Request a quote for your specific use case and we'll size a system properly. Our electrical work is some of our most respected - we're often called to fix other shops' install mistakes.