With lots of data, and several years using a home storage battery I've condensed my thinking into 20 minutes giving a couple of formulae to help size a home battery.

Relevant to UK seasons, adjust accordingly

Of equal importance I discuss why you might want a home starage battery and how your priorities will affect the size you need, or think you need.

Hope this helps

Correction: originally I used September - October not October - November export for sizing but changed my mind and said Oct to Nov in the video.
Sept-Oct gives good result for me so not sure why I changed it🤦‍♂️🤷‍♂️

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System / Components and links / referrals
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Solar config
PV all JA solar 9.2kwp
14X280w (3.68kw Solis)
8X300w (2.0kw Solaredge)
4x450w Solis string 1
3x370w (2.5kw) Solis string 2

Myenergi Zappi 1, Eddi and Hub

Battery:
Victron Multiplus II 48/5000
Cerbo GX
5 x Pylontech Us3000C
ET112 meter on the solar & AC out

EV:
Mini Electric Cooper SE Level 3 in midnight black and Chester leather

EGolf in Oryxx white and Vienna Black leather


OCTOPUS energy referral link....
share ** £50 credit each **

🐙🔌https://share.octopus.energy/pink-ros...


⚡Instavolt App referral : £5 free charging each

⚡https://driver.emsp.instavolt.co.uk/r...

Twitter: @EVPuzzle