520Ah Lithium · Runtime

How long will a 520Ah lithium leisure battery actually last?

520Ah is our largest capacity yet - two 260Ah packs built into one case for near-residential off-grid, the biggest marine house banks and the heaviest, most sustained inverter loads. Here is exactly what a TITAN 520Ah delivers, with real runtimes for the kit most people carry.

View the TITAN 12V 520Ah→ Size it for my setup→
520Ah
Rated capacity
6656Wh
Usable energy
6.66kWh
Per full charge
1040Ah
Lead-acid for the same

What a 520Ah TITAN runs, and for how long

Figures assume a usable 6656Wh 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 ~6.9 days
LED lighting 12 W ~23.1 days
Diesel night heater 18 W ~15.4 days
Water pump 60 W ~4.6 days
Phone and tablet charging 12 W ~23.1 days
Laptop 60 W ~4.6 days
TV or projector 45 W ~6.2 days
Wi-Fi or 4G router 10 W ~27.7 days
Electric blanket 45 W ~6.2 days
CPAP machine 40 W ~6.9 days
MicrowaveAC 800 W ~7 hours
Coffee machineAC 1000 W ~6 hours
1800W induction hobAC 1800 W ~3 hours
2000W kettleAC 2000 W ~3 hours

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 520Ah TITAN holds a usable 520Ah. Nearly everyone running one of these has at least one panel on the roof, so these are the figures that actually describe life with the battery: a single 100W panel putting back around 25Ah a day between April and October, before any driving or hook-up.

Light weekender
34.7 days
~40Ah used, ~25Ah back from solar, so about 15Ah net a day. Fridge, lights, phone charging and the odd pump cycle.
Typical touring
10.4 days
~75Ah used, ~25Ah back from solar, so about 50Ah net a day. Fridge, lights, diesel heater, water, TV and device charging.
Heavy or full-time
5.5 days
~120Ah used, ~25Ah back from solar, so about 95Ah net a day. All of the above plus regular inverter use for cooking and appliances.

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

With no solar at all

The floor rather than the normal case, and worth knowing if you have no panel fitted, park under trees, or travel through the depths of winter. Nothing goes back in, so the battery simply runs down at your daily rate.

Light weekender
13.0 days
~40Ah per day, nothing coming back in.
Typical touring
6.9 days
~75Ah per day, nothing coming back in.
Heavy or full-time
4.3 days
~120Ah per day, nothing coming back in.

Lithium vs lead-acid at 520Ah

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 520Ah lead-acid gives you roughly 260Ah of safe, usable energy. A TITAN lithium of the same 520Ah rating gives you the full 520Ah, because LiFePO4 happily delivers its entire rated capacity.

Put simply, you would need around a 1040Ah 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.

520Ah is the new top of the range. Two 260Ah packs sit side by side in one electrocoated case, so it suits near-residential off-grid systems, the largest marine house banks and builds with heavy, sustained inverter demand. Build a bank from several and you have power that behaves like mains.

See full specs and price→

Common questions

How long will a 520Ah lithium battery last?
A 520Ah TITAN gives a usable 6656Wh, roughly 520Ah, from a full charge, enough to run a 40W compressor fridge for about 166 hours. With one 100W panel putting back around 25Ah a day, a light weekender goes about 34.7 days between charges. With no solar at all that drops to around 13.0 days, and 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 520Ah to use, 100% usable capacity, which is about 6656Wh. A lead-acid of the same rating only safely gives you around half before it starts to wear out.
Will a 520Ah 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 180 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 520Ah pack refills in around 17.3 hours. A 50A charger does it in about 10.4 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.