I have a 16 V lithium battery with 60 Ah.
How much energy can this battery store?
My home specifications are: 220 V mains and I have a contracted power of 6.9 kVA.
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The battery is 60Ah at 16V
So therefore it can provide 60A at 16V for a period of 1 Hour
Alternatively it can provide 30A at 16V for a period of 2 hours
Or 15A for 4 hours - you get the drift. It's the number of amps it can provide in total when drained flat over a period of one hour. The slower you drain it the less current you use, the longer it lasts.
So, for 1 hour it's 60A.
If P=VI then P=16*60
That's 960W over the period of 1 hour.
So 0.96KWh. The length of time this will be for depends on the current you draw.
Your mains power supply has nothing to do with it.