Should I get more battery capacity? - Is it worth the cost?

I've been collecting data and running some calculations to see if it would be worth adding an extra home storage battery to our existing GivEnergy system. Let's see what conclusions I've drawn from that exercise.

Addendum here: https://www.youtube.com/post/Ugkx3IwGg11F0Q8f0WOVl_RVqag2jGQS2UI3

Our home system summary:
6.8 kWp solar array split E/W
5 kW Gen 2 GivEnergy hybrid inverter
14.7 kWh GivEnergy batteries
A2A heat pump heating/cooling system
Myenergi eddi hot water diverter
Fiat 500e EV

Solar and battery tour:
https://youtu.be/m1mIljYtFds

A2A heating tour:
https://youtu.be/PIgrN9uJfHY

00:00 Introduction
00:43 Reasons for adding more battery capacity
04:04 Cost calculation
12:32 Current battery prices
16:41 Conclusion
17:50 Closing remarks

Please note that Tim is not a professional consultant, just an enthusiastic amateur, so cannot reply to requests for advice or opinions on specific systems or green investment opportunities. Thank you for your understanding.

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