The lithium battery for your Coachman motorhome.
Coachman is best known for caravans, but since 2022 the Hull factory has been building a focused range of motorhomes on Mercedes-Benz Sprinter and Fiat Ducato bases. Every model leaves the line with a factory AGM that you can only safely half-use. A TITAN DIN lithium drops into the same footprint and gives you the full rated capacity - whether you are on a weekend pitch or a fortnight in the sun with no hook-up.
A caravan name that builds serious motorhomes
Coachman has been one of the UK's leading caravan manufacturers since 1986, and the move into motorhomes from 2022 brought the same build quality to a new set of buyers. The motorhome range is built at the company's plant in Hull, East Yorkshire, and sits on two proven base vehicles: the Mercedes-Benz Sprinter for the Travel Master and Sportivo, and the Fiat Ducato for the Avventura. All three ranges use AL-KO AMC chassis systems for a more controlled ride than a standard van conversion.
The factory leisure battery across all Coachman motorhomes is a sealed AGM. These are reliable and easy to manage, but you can only safely draw them down to around 50% before you start shortening their life. That means a 130Ah factory AGM gives you roughly 60-65Ah of usable reserve in practice. A TITAN lithium of the same nominal capacity gives you close to 100% usable - and unlike the AGM, the lithium holds its voltage flat across the discharge curve, so your appliances run at full performance right to the end of the charge.
For the full picture on switching a coachbuilt motorhome to lithium, the motorhome battery guide covers the fundamentals. If you are comparing Coachman against other brands, the motorhome brands hub has the wider view.
Sizing a Coachman motorhome by range
A starting point by model range. The Sportivo at 3,500 kg has less payload headroom than the 4,500 kg models, so watch the weight budget when stepping up in capacity.
| Model | How it gets used | Good fit |
|---|---|---|
| Sportivo (Mercedes Sprinter, 3,500 kg)Category B licence, twin beds, ~450 kg payload - weight budget matters | Weekend touring, lights, fridge, heating, phones | 100Ah to 120Ah touring, 150Ah off-grid |
| Avventura (Fiat Ducato, 4,500 kg)C1 licence, island or twin beds, more payload headroom | Longer stays, regular off-grid nights, more devices | 120Ah to 150Ah touring, 180Ah to 230Ah off-grid |
| Travel Master (Mercedes Sprinter, 4,500 kg)C1 licence, island or twin beds, replaces factory twin 130Ah AGM | Extended touring and off-grid, inverter use | 150Ah touring, 180Ah to 230Ah off-grid |
These are starting points, not fixed rules. The Travel Master leaves the factory with two 130Ah AGMs - a single 180Ah or 230Ah lithium can replace both and free up significant weight and space. Only consider 330Ah on a 4,500 kg model with confirmed battery-bay space and weight budget. Total your own loads in the battery size calculator for the honest figure. Measure your battery space, including terminal height, before ordering.
Where the leisure battery fits in a Coachman motorhome
Coachman does not publish the exact battery location for each motorhome model, so the right approach is to check your handbook and measure your battery bay before ordering rather than relying on any general description. That said, the most common locations in coachbuilt motorhomes of this type are:
- A habitation locker or underfloor compartment. Most coachbuilt motorhomes on Sprinter and Ducato bases locate the leisure battery in an accessible locker, often externally latched on the offside. This gives good access for maintenance and room to mount the charger and fusing alongside.
- A garage or under-floor storage area. Some layouts with a rear garage run the battery bank inside the garage space, where there is more room for larger capacity batteries or parallel pairs.
The TITAN DIN case is sealed to IP67, so it handles the damp typical of locker and underfloor mounts without issue. The RJ45 comms ports drop to IP32 while a cable is plugged in, so keep any connected port clear of standing water. Because battery-bay dimensions vary between Coachman model years and layouts, always measure the space - including the clearance above the terminals - before you buy. If the tray dimensions are not in your handbook, a quick email to Coachman owners' communities will usually get you real-world measurements from someone with the same model.
Charging a Coachman from alternator, solar and mains
Coachman motorhomes charge the leisure battery from three sources: the engine alternator while driving, roof solar through an MPPT controller, and the mains charger on a site hook-up. Lithium accepts all three faster than the AGM it replaces, so a motorway run or a sunny afternoon puts meaningful capacity back rather than a slow overnight trickle.
The alternator is where both Coachman base vehicles need careful thought. The Mercedes-Benz Sprinter from 2014 onwards and the Fiat Ducato from 2016 onwards both run variable-voltage smart alternators. These regulate their output based on the state of the starter battery and driving conditions rather than holding a steady voltage, which means they will not reliably fill a lithium leisure battery on their own. The fix is a DC-DC charger, also called a battery-to-battery charger, wired between the starter battery and the leisure bank. We would fit a Victron Orion every time - it delivers a clean, controlled charge to the lithium and protects the starter battery from being drawn down in the process. A split-charge relay does work but is not the most reliable approach with lithium, and some relays cause a backfeed that quietly clips the top portion of your usable capacity.
One important note: the Sportivo, Avventura and Travel Master all offer a factory lithium option. Where your Coachman was specified from new with a factory lithium battery, the on-board charging system may already be configured to suit lithium correctly. Check your build specification and handbook before making any changes to the charging setup. If you are adding lithium to a model that left the factory on AGM, the charger compatibility list covers which mains chargers and solar controllers work with lithium out of the box.
Plan your roof solar with the solar sizing guide, check your existing charger on the compatibility list, and size the battery around the gap your charging sources cannot cover overnight. Every TITAN carries a custom BMS, charges safely down to -30C, and comes with a lifetime, fully transferable warranty.
