Off-Grid Power System Guide
System design, component selection and configuration for 12V and 24V vehicle-based off-grid power systems.
Off-Grid Power — System Design Principles
Off-Grid Power System Guide
Off-grid power systems for vehicles, vans and expedition builds require careful component matching — battery capacity, charging sources, load management and safety systems all need to work together. This guide covers system design principles, component selection and configuration for 12V and 24V vehicle-based off-grid power systems.
Battery Selection
Why LiFePO4?
LiFePO4 (lithium iron phosphate) offers 3,000–5,000+ cycle life, flat discharge curve, higher charge efficiency, lower weight than AGM and inherently stable chemistry — the recommended choice for vehicle off-grid systems.
Charging Sources
DC-DC Charging from Alternator
A DC-DC charger provides a controlled multi-stage charge profile matched to LiFePO4 chemistry — a simple split charge relay is not adequate.
Solar Charging
An MPPT solar charge controller is required for LiFePO4 compatibility — not PWM.