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Store electricity for a cloudy day:

All renewable electricity generated by an eligible installation can receive payments under the Feed In Tarriff (FIT's) for every unit of electricity produced. This is true for off-grid systems as well as on-grid ones – you will get the same generation tariff, though obviously you can’t get export payments.

Isolated homes with no mains electricity supply either have to make do without electricity, or generate their own. For these houses, a renewable electricity generation system - using Solar PV could be the answer. An off-grid system can be cheaper than getting a mains connection, and is much cheaper and quieter than running a diesel generator all day and night.

Electricity from the batteries can be used directly to run low-voltage lighting and perhaps other direct-current (DC) appliances. However, most systems include an inverter to produce mains voltage alternating current (AC), which can be used to run standard appliances. 

The heart of most off-grid systems is the battery store. A bank of deep-cycle batteries will store electricity when it is generated, to provide power for when it is needed. With proper controls and system design, a battery bank may last five years or more, but it will not last for ever, so you should budget to replace the batteries several times during the life of a system.

The inverter may act as a battery charger, as well as looking after the batteries and controlling the system.