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@Ndeipi
Besides cycle life of batteries (which might well be the killer), remember you'll also have to budget for an inverter.
The grid is AC (as are most of your appliances) and batteries are DC.
So you'd buy cheap AC power at night and rectify to DC to charge your batteries. No issue there.
But you'll need to invert back to AC to run your appliances, requiring a beefy 4-5kW inverter which will add £550-700 to your system cost.
Also, losses.
Rectifiers, batteries and inverters each have efficiencies higher than 90% or even 95%, but when you stack these inefficiencies up together you might lose near 10% of your energy. (But the losses will be heat which is actually valuable/usable in the home, less valuable in a garage.)