180Ah Lithium · Runtime

How long will a 180Ah lithium leisure battery actually last?

180Ah is the big single-battery choice for motorhomes and vans running an inverter, and a sensible start point for a marine house bank. Here is exactly what a TITAN 180Ah delivers, with real runtimes for the kit most people carry.

View the TITAN 12V 180Ah→ Size it for my setup→
180Ah
Rated capacity
2304Wh
Usable energy
2.3kWh
Per full charge
360Ah
Lead-acid for the same

What a 180Ah TITAN runs, and for how long

Figures assume a usable 2304Wh from a full charge. Items marked AC run through an inverter, so we have allowed for around 10% conversion loss. Real life varies with temperature, cable runs and how hard the kit works.

ApplianceTypical drawRuntime
12V compressor fridge 40 W ~2.4 days
LED lighting 12 W ~8.0 days
Diesel night heater 18 W ~5.3 days
Water pump 60 W ~38 hours
Phone and tablet charging 12 W ~8.0 days
Laptop 60 W ~38 hours
TV or projector 45 W ~2.1 days
Wi-Fi or 4G router 10 W ~9.6 days
Electric blanket 45 W ~2.1 days
CPAP machine 40 W ~2.4 days
MicrowaveAC 800 W ~3 hours
Coffee machineAC 1000 W ~2 hours
1800W induction hobAC 1800 W ~69 min
2000W kettleAC 2000 W ~62 min

Runtimes are a single appliance running on its own from 100% to empty. In the real world you run several at once, so use the battery size calculator to total your daily draw and size the bank properly.

How many days off-grid?

A 180Ah TITAN holds a usable 180Ah. Match that to a typical day's use and you get a realistic time between charges, before any solar or alternator top-up.

Light weekender
4.5 days
~40Ah per day. Fridge, lights, phone charging and the odd pump cycle.
Typical touring
2.4 days
~75Ah per day. Fridge, lights, diesel heater, water, TV and device charging.
Heavy or full-time
1.5 days
~120Ah per day. All of the above plus regular inverter use for cooking and appliances.

The same days, with a 100W solar panel

A single 100W panel puts back around 25Ah a day on average between April and October, the months most people are actually out. That daily top-up slows the battery down like this, before any driving or hook-up.

Light weekender
12.0 days
~40Ah used, ~25Ah back from solar, so about 15Ah net a day.
Typical touring
3.6 days
~75Ah used, ~25Ah back from solar, so about 50Ah net a day.
Heavy or full-time
1.9 days
~120Ah used, ~25Ah back from solar, so about 95Ah net a day.

Those solar figures use one average 100W panel. For your exact panels, roof and time of year, run the numbers in the solar calculator.

Lithium vs lead-acid at 180Ah

This is where the rated number misleads people. A lead-acid leisure battery should only be taken to around half its capacity before it starts to wear out fast, so a 180Ah lead-acid gives you roughly 90Ah of safe, usable energy. A TITAN lithium of the same 180Ah rating gives you the full 180Ah, because LiFePO4 happily delivers its entire rated capacity.

Put simply, you would need around a 360Ah lead-acid bank to match the usable energy of this one TITAN battery, at roughly double the weight and a fraction of the cycle life. That is the real reason lithium wins on anything where weight, space or how often you charge actually matters.

180Ah is the point where a single battery comfortably supports an inverter for a microwave or coffee machine in short bursts, alongside the usual habitation loads. It is also a sensible first block for a larger marine or off-grid bank built from several packs.

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Common questions

How long will a 180Ah lithium battery last?
A 180Ah TITAN gives a usable 2304Wh, roughly 180Ah, from a full charge. That runs a 40W compressor fridge for about 58 hours, or covers a light weekender for around 4.5 days between charges. Heavy users with inverter cooking get closer to a day.
How many amp hours can I actually use?
All of it. A TITAN gives you the full 180Ah to use, 100% usable capacity, which is about 2304Wh. A lead-acid of the same rating only safely gives you around half before it starts to wear out.
Will a 180Ah battery run a kettle or induction hob?
Through an inverter, yes, but only in short bursts. A 2000W kettle pulls around 165A from a 12V battery, so this pack would boil for roughly 62 minutes total on a full charge. For regular cooking you want a bigger bank, a high-output inverter and ideally more than one battery.
How long does it take to recharge?
It depends on the charger. From a 30A mains charger or DC-DC unit, a flat 180Ah pack refills in around 6.0 hours. A 50A charger does it in about 3.6 hours. TITAN packs take a high charge current happily, so the limit is usually your charger, not the battery. Check the charger compatibility list.
Can I charge it from the alternator while I drive?
Yes. The way we recommend is a DC-DC charger, also called a battery-to-battery charger, ideally a Victron Orion, which gives the lithium a clean, controlled charge and protects the starter battery. A standard split-charge relay does 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.
Is this enough for my van or boat?
For most weekend and touring setups, yes. Full-timers and anyone running inverter appliances regularly should size up or add a second battery. The quickest way to be sure is the battery size calculator, which totals your daily draw and recommends a capacity.

Compare the range

Every TITAN leisure battery is LiFePO4 with a custom TITAN BMS, IP67 casing and a lifetime, fully transferrable warranty. Pick the capacity that matches your use.