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Fact-checked on Apr 1, 2026
VANPOWERCALC.COMYOUR 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
RÉGULATEUR 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.COM
The Victron Orion-Tr Smart 12|12-30 is on more vans than any other DC-DC charger. $200-250, 30A output, Bluetooth monitoring, configurable charging profiles. I've installed it on three vans and it just works. But it's not always the right choice.
Charging data from my Sprinter: the Orion-Tr delivers 30A steady once the engine is warm — that's 360W or 360Wh per hour of driving. On a cold start, it ramps up over 5-10 minutes to avoid alternator stress. With a Euro 6 smart alternator fluctuating between 12.4-14.8V input, the Orion boosts output to a stable 14.4V (AGM) or 14.6V (LiFePO4) regardless of input voltage.
Expert tip
Mount the Orion-Tr vertically on a panel near the battery — it runs warm at full output (40-45°C case temperature) and needs airflow around the heatsink fins. Don't mount it in an enclosed space or lay it flat — heat builds up and the unit derates to protect itself, dropping from 30A to 20A.
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
151 Ah
(80% depth of discharge)
Recommended AGM battery
241 Ah
(50% depth of discharge)
Recommended solar panels
402 Wc
About this tool
Where the Orion-Tr shines: Bluetooth monitoring via VictronConnect app shows real-time input/output voltage, current, and charging state. You can adjust charge profiles without crawling behind the battery. It integrates with the Victron ecosystem if you have a SmartShunt or Cerbo GX. Where it falls short: 30A is sometimes not enough. If you have a 300Ah bank and drive 1-2 hours/day, 30A puts in 360-720Wh — that might not cover a heavy consumption day. Victron's solution: parallel two Orion-Tr 30A units for 60A. But that's $400-500 for 720W of alternator charging. The Renogy DCC50S does 50A for $150-200 AND has a built-in MPPT solar input — potentially replacing two devices with one. The trade-off: no Victron ecosystem, no VE.Direct integration, and Renogy's app is less polished. For all-Victron builds: Orion-Tr is the obvious choice. For budget builds: the Renogy DCC50S offers better value.
Frequently asked questions
Is 30A DC-DC charging enough for a van?▼
For most builds with 200Ah battery: yes. One hour of driving = 30Ah = 15% of a 200Ah bank. Two hours covers most daily consumption. For 300Ah+ banks with heavy use, consider paralleling two units or the Renogy 50A.
Victron Orion-Tr vs Renogy DCC50S?▼
Orion-Tr: 30A, $200-250, Bluetooth, Victron ecosystem. Renogy DCC50S: 50A, $150-200, built-in MPPT solar input, no Victron integration. For all-Victron builds: Orion. For budget builds wanting DC-DC + solar in one box: Renogy.
Can I parallel two Victron Orion-Tr?▼
Yes — officially supported. Connect both to the same battery with individual fuses. They share the load automatically. 60A total output. The Bluetooth app shows both units. This is Victron's solution for larger battery banks.
Where should I install the Victron Orion-Tr?▼
Close to the house battery — the output side carries the most current. Mount vertically with heatsink fins exposed to airflow. Keep it accessible for Bluetooth range and troubleshooting. Fuse both input (40A) and output (40A) cables.
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