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If you're ordering a new Transit specifically for a van build, the options list matters more than the price. Some $200 factory options save you $1,000+ in aftermarket work. Others are a waste of money because you're ripping them out anyway.
The must-have options: Dual battery/upfitter prep package — pre-runs heavy-gauge cable from alternator to rear. Saves $300+ in cable and a full day of labor. 148" wheelbase, high roof — the only configuration that's comfortable to stand in and sleep lengthwise. Rear camera delete (if available) — you're removing the factory interior anyway. Skip: cruise control is worth keeping, the factory stereo is fine, and side windows are personal preference.
⚡ Expert tip
Order the highest-output alternator option (200A+ if available). The price difference is $100-200 at the factory but $800+ for an aftermarket alternator upgrade. More alternator headroom means faster DC-DC charging without stress.
Example calculation for your setup
Results based on a typical use case
| Appliance | Power | Usage/day | Wh/day |
|---|---|---|---|
| Compression fridge | 45W | 24h | 1080 |
| LED lighting | 20W | 4h | 80 |
| Water pump | 30W | 0.5h | 15 |
| Phone charging | 15W | 2h | 30 |
| Daily consumption | 1205 Wh | ||
Recommended LiFePO4 battery
126 Ah
(80% depth of discharge)
Recommended AGM battery
201 Ah
(50% depth of discharge)
Recommended solar panels
302 Wc
4h average sun hours
Recommended inverter
No 220V appliances — no inverter needed
Adjust these values with the calculator below
VANPOWERCALC PROYOUR ENERGY PROFILE
YOUR ENERGY PROFILE.
This document contains the sizing of your future electrical installation, calculated based on your appliances.
Minimum Daily Consumption
0 WH / DAY
Inventory:
SYSTEM SIZINGPage 2
Battery
To guarantee 0WH without damaging your bank (80% max discharge):
0 AH
LiFePO4 12V
Solar
Minimum power required to recharge your consumption:
0 W
via MPPT
220V AC
Maximum power (with 25% safety margin).
0 W
No Need
Safety & CablingPage 3
12V Cable Sizing Guide
Use this professional reference table to select the correct gauge (mm²) for your cables. For 12V in a van, the maximum tolerated voltage drop is 3%. Always use multi-stranded flexible automotive wire.
| Current (A) | Round trip < 2m | Round trip 4m | Round trip 6m |
|---|---|---|---|
| 5A (LEDs, USB) | 1.5 mm² | 2.5 mm² | 4 mm² |
| 10A (Fridge, Pump) | 2.5 mm² | 4 mm² | 6 mm² |
| 20A (Heater) | 4 mm² | 10 mm² | 10 mm² |
| 50A (DC/DC Booster) | 10 mm² | 16 mm² | 25 mm² |
| 100A (Inverter) | 25 mm² | 35 mm² | 50 mm² |
Fuse Sizing
The fuse protects the wire, not the appliance. Always place it as close to the power source as possible (battery or busbar).
- Wire 1.5 mm² → Max fuse 10A
- Wire 2.5 mm² → Max fuse 20A
- Wire 4 mm² → Max fuse 30A
- Wire 6 mm² → Max fuse 40A
- Wire 10 mm² → Max fuse 60A
SCHÉMA ÉLECTRIQUE
PANNEAUX SOLAIRES
0W
REGULATEUR MPPT
BATTERIE AUXILIAIRE
0 Ah
Lithium LiFePO4
FUSIBLE
FUSIBLE
BOÎTE À FUSIBLES 12V
Pompe, Leds, Frigo...
CONVERTISSEUR 220V
NON REQUI
PRO GEARPage 4
SHOPPING LIST
Where to find this equipment? Here is the community-approved selection.
12V 6-way Fuse Box
Mandatory protection
Digital Multimeter
Test your connections
Heavy Duty Crimping Tool
For perfect lugs
Heat Shrink Tubing
Insulation and safety
GENERATED BY VANPOWERCALC PRO - UNLIMITED.
About this tool
The 2026 Transit comes with Ford's 2.0L EcoBlue diesel (EU) or 3.5L EcoBoost V6 (US). Both have smart alternators — factor a DC-DC charger into your build cost regardless of engine choice. The diesel is more efficient for long-distance travel; the gas V6 is cheaper to maintain in the US. One thing Ford changed for 2026: the electrical pre-wire option now includes a 30A relay-ready circuit to the rear. This doesn't replace a DC-DC charger (it's still relay-based, not voltage-boosted) but it provides the wire routing you need. Just remove the relay and wire in your DC-DC charger using the same cable run. If you're converting for full-time living, order the most basic interior trim. You're removing the floor, walls, and ceiling anyway. Cargo van spec saves $2,000-5,000 over passenger van trim. Keep the front seats nice — you're sitting in them daily.
Frequently asked questions
Which Ford Transit wheelbase for a van conversion?▼
148" extended wheelbase (350 HD) is the gold standard — enough length for a bed, kitchen, and bathroom without sacrificing driving maneuverability. The 130" works for minimalist builds. The 178" extended is rarely needed and harder to park.
Should I order a cargo or passenger Transit?▼
Cargo van, every time. You're removing the interior anyway. Cargo spec saves $2,000-5,000 and you don't deal with removing passenger windows, seats, and trim. Exception: if you need windows for natural light and don't want to cut the body yourself.
Is the dual battery prep package worth it?▼
Absolutely. It pre-runs heavy-gauge cable from the engine bay to the rear — saving you a full day of routing cable through the chassis. At $200-400 factory cost, it's the best value option for any conversion.
Diesel or gas engine for van life?▼
Diesel (2.0L) for European travel and long-distance touring — better fuel economy and easier to find diesel in Europe. Gas V6 (3.5L EcoBoost) for US-focused builds — cheaper maintenance, more power, and US diesel prices aren't always competitive.
What factory options should I skip?▼
Skip: premium interior trim (you're gutting it), built-in navigation (phone does better), rear window wiper (covered by your build), and any rear interior options. Keep: cruise control, power mirrors, upgraded alternator, dual battery prep.