Photovoltaic energy storage battery costs

A solar battery costs start from £2,500, and they average around £5,000You should expect to pay around £900 per kWh of storage capacityThe typical home will save approximately £582 each year from a solar-plus-storage system [pdf]
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How much tilt should photovoltaic panels have to be to be effective

To optimize performance, tilt your panels at an angle that is 10-15 degrees less than your latitude. For example, if you live at a latitude of 40 degrees, set your panels at about 25-30 degrees. [pdf]