Categories: Solar 2 Energy

Solar system battery storage and cost Effective

2 months ago

Is solar system battery storage cost effective? The demand for home batteries has risen sharply in recent years. Consumers who desire lower electricity bills and independence have increased demand, and technological storage innovations have brought the price to an affordable level.

Home batteries enable you to optimize your consumption so that your electricity costs can be permanently reduced with backup power!

Home batteries - Where is the benefit?

Energy systems without a home battery produce power that must be used immediately. This is rarely efficient since PV energy is mainly generated during the day when the electricity requirements of most households are lower.

The demand for electricity increases sharply during the evening. With a solar battery storage system, you can use the photovoltaic energy that was not required during the day when you need it. Without having to change your habits, you can:

  • Keep reducing your electricity bills;
  • Personally, contribute to the energy revolution;
  • Optimize your consumption;
  • Energy independence of major energy suppliers.

Solar system battery storage cost Effective

Lead or lithium-ion batteries, a fundamental decision

Home batteries for residential use are equipped with either lead-acid, lead-gel or lithium-ion batteries. Lead acid batteries were used most frequently in the past as car batteries. Given their significant benefits, lithium-ion batteries are increasingly being used than lead-acid batteries.

They have become the standard in photovoltaic systems in recent years. Lifespan: The expected lifespan of lithium-ion batteries is approximately 15 years, while the lifespan for lead batteries is between 5 and 10 years.

Lead batteries must be accommodated in a ventilated area because they emit gases. This is not a requirement for lithium-ion batteries. Discharge depth: Lithium-ion batteries discharge up to 100% of the stored current.

Lead acid batteries can only discharge up to 50%, and deeper discharges shorten their overall lifespan. System efficiency: The system efficiency of lithium-ion batteries can be more than 90% while only about 70% can be achieved with lead batteries.

Home batteries with lead batteries must, therefore, be more prominent, which increases the price. Our tip: install a solar battery with lithium ion.

Battery backup cost Effective

After you have chosen between lithium-ion batteries and lead-acid batteries, it is advisable to consider the following criteria when selecting a storage solution.

Storage capacity

The size or capacity of the storage system must correspond to household consumption. The system must in principle be large enough to provide a household with photovoltaic energy from evening until the following morning.

A battery system of 4 to 6 kWh is usually sufficient for an average house of four people that consumes 4500 kilowatt hours kWh annually. Too small or too large a device entails unnecessary extra costs.

If it is too small, not enough energy can be stored to meet the needs. Then you will have to buy additional electricity from the grid. If it is too large, the solar power that is not required is permanently stored, which reduces the battery life and saves you money.

Depth of discharge (DOD)

Depth of Discharge (shallow discharge) means what percentage of the stored energy can be absorbed from the device. To prevent damage, the majority of battery systems for electrical power require an extra charge. The market standard is a discharge depth of between 50% for lead batteries and up to 100% for lithium-ion batteries such as the BYD B-BOX.

According to Bundesverband Solarwirtschaft e. V. (the German Federal Association for the PV Industry), a battery storage system should never be discharged below the designated discharge depth, as this shortens the life of the battery.

Individual electricity requirements

To choose the right type, we recommend that you determine the electricity requirements of your household as accurately as possible.

View your annual electricity consumption for the past five years, or ask an expert for advice. The general rule for an average household consisting of four people is: A photovoltaic system with a capacity of 4 to 6 kilowatts peak (kWp) can meet the average annual demand (approximately 4,500 kWh).

A storage system must have a usable capacity of 4 to 6 kWh. The solar battery BYD B-BOX L 4.5 kWh battery has a capacity of 4.5 kWh with a total efficiency of 93%, and the package can generate the required electricity for a household with four people.

How do home batteries work?

The purpose is clear: They make electricity available when you need it - usually in the evenings and at night. The principle behind this is as follows:
The power generated in a photovoltaic energy system is first used for its consumption. This means that active electricity consumers such as freezers or other household appliances are immediately supplied with solar electricity.

But if more power is available than required, the excess electricity flows back into the battery with a battery inverter and recharges it. The unused electricity only flows to the public grid when the battery is full. When power is then required in the evening, the stored solar energy is available.

If the electricity requirement during the day exceeds the amount energy produced, the stored electricity is also available - regardless of whether the storage system is wholly or partially charged.

Excess electricity is then only taken from the public grid when the battery is completely discharged. In this way, it is possible to cover a large part of your electrical needs with the electricity generated by the photovoltaic system.

How can I integrate a home battery in my existing renewable energy system?

Most of the available home batteries on the market cannot directly be integrated into an existing solar energy system. Often technical changes, such as another converter or additional work, have to be carried out.

The heavyweight, and in some cases, the large dimensions of many electricity backup systems determine where they can be safely installed, and a large amount of work can accompany this. Often several installers have to be put to work for at least one day.

How effective are energy systems?

The investment in a storage system is always worthwhile when you purchase a new photovoltaic system with solar panels. It allows you to use a more significant part of your PV energy for yourself and considerably reduces the amount of electricity that you purchase from an electricity supplier.

It is useful in any market where the price of electricity is higher than the feed-in income - if feeding power to the national network is no longer economically sensible. System operators that receive additional reimbursement for solar power used in their own home must extend their PV installation a battery system.

Our tip: Take into account future developments when choosing. If it is likely that the legal conditions will change in the near future or that your green energy system will yield less, it is advisable to install a PV storage system.

The installations cost - what can you expect

There are more than 10 different producers on the Portugese storage system market today. Pricing depends, among other things, on the capacity, whether lithium-ion or lead-acid batteries are used and which components are installed.

Due to significant price fluctuations, we recommend that you carefully review the technical data or properties and determine what is important to you.

Use valuable energy yourself.

With a storage system, you can use PV energy when you need it and keep reducing your electricity bill. Home batteries are a valuable investment because of sophisticated technology, long life and recently reduced prices - this applies to new and existing solar systems.