How Can We Use Solar Energy / Solar Power For Household Purpose.?

The use of solar panels are the only viable method as they can be used to heat water. Water heating in a house is a very costly exercise by electricity at nearly 20pence for a KWHour.
Even if they are only effective for only 8 months in a year there is a saving.
The cost of installing them is quite high so if you are only thinking of economics the pay back time is many years. If you are looking to cut down on green house gases then this is a good first step.
The next thing to consider is to put a good thick layer of insulation in your loft and have cavity fill insulation in the external walls of your house.
Double glazing will cut down on heat losses and therefore reduce your fuel bills.
Make sure that your hot water cylinder is well lagged.
Turn the heating thermostat(s) down a little and you will not notice the difference. The fuel consumption will go down though.
I have done all this and in my 3 bedroom house, cooking by electricity and gas central heating my total fuel bill is £550.00 per year

You’ll need quite a few solar panels to be of any use and they’re expensive. Some countries use the suns energy to heat up water because hot water can be stored easily. Electricity can’t, but there is a way of doing it. You could actually store power in high capacity batteries (for example a 12V one from a car), and use a DC to AC converter to step up the voltage to 240V AC. This way, you can store the power and use it when you want. You’ll probably need several square metres of solar panels though to generate a moderate amperage of power. To make this practial will be costly, and the costs involved will probably be far more significant than the cost of having the power supplied to you (hence why nobody does it). But good on you for being eco-friendly and wish more people took the initiative.

I was thinking of geothermal heating system for my home.
They don’t really make a good solar panel yet.
There are some for heating water, but if it rains for 3 days you’re back to using gas or electric.