The lithium battery for your Adria motorhome.
Adria Mobil build everything from the compact Twin campervan to the flagship Supersonic A-class, and the range spans two base vehicles - Fiat Ducato and Mercedes Sprinter - depending on which model you have. That split matters for your charging setup, and this page covers both. Factory lead-acid out, TITAN lithium in: you keep the same locker footprint and gain the full rated capacity rather than half of it.
Two base vehicles, one lithium answer - but check yours first
Adria Mobil, based in Novo Mesto, Slovenia, have built motorhomes and campervans since 1965. What makes their range unusual among European manufacturers is that they use two different base vehicles across the line-up - and in some model families, such as the Matrix and Coral coachbuilts, the same name covers both a Fiat Ducato version and a Mercedes-Benz Sprinter version. Checking your V5C or the cab badge tells you which platform you have, because the two run different smart alternator systems and that affects how you charge a lithium leisure battery.
The rest of the range splits more cleanly. The Twin, Twin Sports and Twin Supreme campervans, the Compact, Sonic and most Coral coachbuilts all use the Fiat Ducato. The Supersonic A-class flagship and the premium Twin Supertwin campervan with available AWD both use the Mercedes Sprinter. Sun Living, Adria's value sub-brand, is a separate line and is typically Ford Transit based - it shares the Adria design family but not the same battery or charging setup.
Whichever platform you are on, the leisure battery upgrade logic is the same: the factory fits a single 90Ah to 110Ah lead-acid or AGM that you can only safely half-empty before it starts to suffer. A TITAN DIN lithium drops into the same kind of space, gives you close to the full rated capacity every cycle, and charges fast enough that a decent drive or a sunny afternoon makes a real dent in what you used overnight. For the broader picture of living with lithium in a coachbuilt, the motorhome battery guide covers the fundamentals, and the motorhome brands hub has comparisons across the major manufacturers.
Sizing an Adria by model
A starting point by model type. Most Adria motorhomes and campervans leave the factory on a single 90Ah to 110Ah lead-acid or AGM, so even a like-for-like lithium gives you considerably more usable power.
| Model | How it gets used | Good fit |
|---|---|---|
| Twin campervan (Fiat Ducato)Twin, Twin Sports, Twin Supreme panel van conversions | Touring, lights, fridge, phones | 100Ah to 150Ah |
| Matrix / Coral / Compact / Sonic (coachbuilt, Ducato or Sprinter)Semi-integrated and coachbuilt, 2-6 berth - check your cab badge | Touring to extended off-grid | 150Ah to 230Ah |
| Supersonic / Twin Supertwin (Mercedes Sprinter)A-class flagship and premium AWD campervan, larger lockers | Extended off-grid, inverter use | 180Ah to 330Ah |
These are starting points, not fixed rules. The honest figure comes from your own loads, not the model name, so total them in the battery size calculator. Battery locker and tray dimensions vary by model year and Adria specification level - measure your existing space, including terminal height, before ordering. For larger banks you can run matched packs in parallel where the locker allows.
Where the leisure battery lives in an Adria
Battery location on an Adria varies by base vehicle and layout. The common positions are:
- Under the cab seat (Ducato models). On Fiat Ducato-based Twin campervans and many Coral and Matrix coachbuilts, the leisure battery sits in a box under the passenger cab seat. The low, flat DIN case is made for exactly this - it keeps weight down and central, and our terminals sit low on the case to help clear the seat frame on tighter swivel-seat installations.
- Under the driver seat (Sprinter models). On Mercedes Sprinter-based Adrias, including the Supersonic and Twin Supertwin, the factory battery typically lives under the driver seat. Clearance dimensions here differ from the Ducato, so measure carefully - the Sprinter locker is often a different shape from what the Ducato gives you.
- In the habitation locker or garage (A-class and larger coachbuilts). Bigger Sonic and Supersonic layouts, and coachbuilts with a rear garage, often carry the battery bank in the garage or external habitation locker. This is the most practical home for a 230Ah battery or above, with room for the charger, DC-DC unit and fusing alongside it.
The TITAN case is sealed to IP67, so it handles the damp and dust of an underfloor or locker mount without issue. The RJ45 comms ports drop to IP32 while a cable is connected, so keep any plugged port clear of standing water. Locker and tray dimensions vary between Adria model years and trim levels - check your handbook and measure the space you have, including height for the terminals, before ordering rather than relying on a brochure measurement.
Charging an Adria from alternator, solar and mains
An Adria motorhome or campervan charges its leisure battery from three sources: the engine alternator while driving, roof solar through an MPPT controller, and the mains charger on hook-up. Lithium takes all three faster than the lead-acid or AGM it replaces, so a decent motorway run or a sunny afternoon puts meaningful capacity back rather than a slow overnight trickle.
The alternator is where both Adria base vehicles need a little thought. The Fiat Ducato Euro 6 runs a variable-voltage smart alternator that will not reliably fill a lithium battery on its own. The Mercedes Sprinter has run smart alternator technology from around 2014, and the 2019+ VS30-generation Sprinter is particularly aggressive - it actively varies the alternator output as part of the vehicle's energy management and will not give a lithium bank a reliable charge without help. On both platforms the fix is a DC-DC charger, also called a battery-to-battery charger, and we would fit a Victron Orion every time. It gives the lithium a clean, controlled charge and protects the starter battery from being drawn down. A standard split-charge relay can work, but it is not the most reliable way to charge lithium and some relays cause a backfeed that quietly skims around the top 15% off your usable capacity. Feeding straight off the alternator with no relay and no DC-DC is not something we recommend.
Plan the roof with the solar sizing guide, check your existing charger against the compatibility list, and size the battery around the gap your charging sources cannot cover overnight. Every TITAN carries a custom BMS with a built-in low-temperature heater so it charges safely down to -30C, and comes with a lifetime, fully transferable warranty.
