The more solar power you consume yourself, the more economical your Solar energy is.Reason: The feed-in tariff is much lower than the price you pay for the electricity from the grid.If you dont have an electricity storage system it makes sense to concentrate consumption on the time when the system is producing electricity.The washing machine dryer and dishwasher should therefore run during the day.If possible charge your e-car during the day on home office days weekends and shift work.
How useful is an electricity storage system?
A power storage can increase self-consumption because it provides solar power even at times when the sun is not shining.Without storage, operators of Solar energy in Pakistan use a maximum of 25 percent of the electricity generate.Because a photovoltaic system generates the most electricity at midday – this is the time when the least energy is usually consume.In the evening, at night or during the dark winter months,however,the electricity yield from the PV drops.Efficient and long-lasting electricity storage devices with lithium-ion technology are not cheap: a storage device with 10 kilowatt hours costs is so expensive.But with a sufficiently large battery storage,households can cover up to 80 percent of their electricity consumption from their own production. And with every electricity price increase, your own financial advantage will increase
Variant 1: Local electricity storage:
With a locally operated battery storage system, you gain independence from the electricity provider.But: From an economic point of view, adding battery storage to a Solar energy is only worthwhile if the costs for generating and storing the electricity are lower than the electricity price that you would pay for an external electricity provider.For every kilowatt hour that you draw from the power grid, you have to pay a good cost. To make the purchase of the battery worthwhile, storing the electricity should cost you less than some cents per kilowatt hour if possible. How much it costs you to store a kilowatt depends on the purchase price and the lifespan of the device. You can count on an operation of ten years, ideally the battery will also do its job for 15 years.A battery storage system is like some pay per hour kilowatt hour of storage capacity, including installation, is worthwhile in our example if it can be operated for more than 12 years.
Tip for e-car owners
A power storage device is particularly useful for owners of an electric car.If this is charged at night with cheap storage electricity from our own production.This reduces our own electricity costs and the purchase of the storage system pays for itself relatively quickly.
Variant 2: Virtual electricity storage
With this model, you feed the surplus electricity you produce into the grid and use it to fill a virtual electricity account with an operator. You build up an electricity balance in a virtual cloud, so to speak, similar to a savings account.On gloomy days, at night or during the winter months, you can easily retrieve this electricity credit and use it yourself at low prices.So nothing is lost and you ultimately use 100 percent of the electricity you have produced yourself with a time lag.This variant can also be used as a supplement to the local electricity storage.
High costs, hardly any feed-in tariffs: is it still worth it?
Owners of an older PV system receive a guarante amount for feeding the electricity they generate into the public grid.At which the energy suppliers must purchase every kilowatt hour of solar electricity. However the Renewable Energy Sources Act (EEG) provides for a continuously decreasing remuneration. Nevertheless the installation of the Solar energy is worthwhile since the electricity from the public grid has become significantly more expensive. Although the prices for Solar energy in Pakistan have risen recently the new models are generally more powerful than they were a few years ago. You also benefit from tax advantages. You can use photovoltaic calculators to find out what effects the current remuneration rates have on the profitability of a new Solar energy.
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