The lithium battery for your van conversion.
A self-build or professional conversion is the opposite problem to a factory camper: you have the space to fit proper capacity, you just want the right battery to build around. Whether it is a Ford Transit Custom day van or a full Ducato off-grid build, our DIN range gives you real usable power, the weight low in the floor, and a pack that lasts the life of the van.
Build it around the right battery
In a conversion you usually choose where the battery lives, which is a luxury a factory camper does not have. That means you can size for what you actually want to run rather than what happens to fit. The trick is to settle the battery early, because its size and weight shape the bench, the bed base and how you balance the load over the axle.
The DIN case sits flat and low, so it tucks under a seat, beneath a fixed bed or into a garage without dominating the build. Because it is lithium you can use close to the full rated capacity, so a single tidy pack often replaces what would have been two or three lead-acid batteries, freeing up both space and payload for water, gear and people. For the wider picture beyond the base van, the campervan battery guide covers living with lithium day to day.
Sizing by base vehicle
A starting point by platform and build type. Conversions vary enormously, so size to your daily use, not just the van.
| Base van | Typical build | Good fit |
|---|---|---|
| Ford Transit CustomDay van to weekender, SWB or LWB | Modest off-grid | 100Ah to 150Ah |
| Ford Transit (full size)Full conversion with heating and water | Regular off-grid | 150Ah to 230Ah |
| Fiat Ducato, Peugeot Boxer, Citroen RelayThe classic big panel van conversion | Serious off-grid | 180Ah to 280Ah |
| Mercedes Sprinter, VW CrafterLarge or full-time build, inverter cooking | Heavy, sustained | 230Ah to 460Ah |
| Renault Trafic, Vauxhall VivaroCompact day van, tight on space | Modest off-grid | 100Ah to 150Ah |
These are starting points, not fixed rules. A LWB Transit Custom can swallow as much as a small Ducato build. The honest figure comes from your loads, which you can total in the battery size calculator.
Where the battery lives
Conversions give you options the factory vans do not. The three common homes:
- Under a seat or bench. The flat DIN case fits the void under a swivel seat or a bench seat neatly, keeping weight low and central.
- Under a fixed bed. The space beneath a rear fixed bed or in the garage is the usual home for larger banks, with room to mount the charger and fusing alongside.
- In an underfloor box. Some builds drop a sealed box below the floor. The IP67 case suits this, with the caveat that the RJ45 comms ports sit at IP32 while a cable is plugged in, so keep connected ports clear of standing water.
Wherever it lives, keep it accessible enough to read the terminals and check the connections, and avoid mounting it hard against a heat source without a gap.
Charging a conversion
Most conversions charge from three sources: the engine alternator through a battery-to-battery charger, roof solar through an MPPT, and mains hook-up through a charger. Lithium takes all three happily and charges far faster than lead-acid, so a long drive or a sunny afternoon puts real capacity back rather than a trickle.
Plan the solar with the solar guide, check your charger and B2B against the charger compatibility list, and size the battery around the gap your charging cannot cover. Every TITAN carries a custom BMS, charging safe to -30C, and a lifetime, transferable warranty.
