Charging lithium

[Tude]

Hi guys
I have a roamer 460amp lithium battery.
I’m on a site with metered electric. I did a test flattened the battery took a metre reading and fully charged the battery overnight. I have a victron 30amp charger.
It used 67 kWh to charge @0.34p per kilowatt dosnt sound right to me .
Any thoughts anyone?

 

[Kannon Fodda]

67 kWh or 6.7kWh? Latter might be more correct allowing for charger inefficiency.

 

[bigtwin]

67 kWh or 6.7kWh? Latter might be more correct allowing for charger inefficiency.

Indeed, and especially if the fridge was running on mains power.

Ian

 

[AdrianChen]

My battery supplier reckons 12.8v for calculations on our Lithium so:

Assuming 10% left in battery
414*12.8=5299.2Wh

So 67Kwh does seem pretty high for a 5.3Kwh battery.

PS. My maths are crap but there must be a "." missing/wrong somewhere..

 

[Tude]

67 I’ve been to the owner he’s looking into it

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[Tude]

Forget to mention the fridge is a compressor 12v only

 

[Raul]

Your battery is 12.8v x 460ah= 5888wh, or 5.88kwh, from zero.
The charger, 30 amps at 13.5v average about 400w. Over 10 hrs it’s 4kwh form ehu. Add some inefficiency and some consumption while you charged, and it could be close to 6.7kwh, but more like 5-5.5kwh. Hard to say exactly without knowing if you used any electricity as well, or charged only, without any other consumption ie. light tv pump etc.

 

[Ian_H]

I'm guessing cost is 34p not 0.34p per KWh. Not that it helps in any way.....
As per others can't see you can have used more than 7 KWh so factor of 10 out. The fridge power supply ultimately comes from the mains even though it's 12V. Any other Campers there to ask if they've had high bills?