What size battery system do I need?

Are you interested in installing solar panel in Brisbane? What size of solar panel array will be sufficient for you? And what about solar batteries to store the energy generated by the panels?

What kind of battery backup system would be the most appropriate one? In this blog, you will get information at a glance.

If you consider solar panels for your home, you will get the most value from them when you self-consume the energy that you produce during the hours of bright sunshine.

When you use energy generated by your system then you have to avoid purchasing expensive energy from the grid.

The rate of self-consumption depends on the amount of energy used in the home on a daily basis. It also depends on the pattern of consumption in the entire day. And it depends on the size of the system installed in your house.

When more devices use solar power in the daytime, the solar self-consumption ratio can be increased.

Calculate the number of batteries needed

Most homes will have between 2 to 3 solar batteries; however, the actual number of solar batteries needed by your system depends on several factors, e.g., energy usage, motive, and size of the solar system.

Nowadays, two main types of solar batteries are available: lead-acid and lithium-ion batteries. One important parameter related to a battery is DoD, i.e., Depth of Discharge. It is the amount of charge used up by the battery.

The DoD of Lead-acid batteries is 50%, while lithium-ion batteries have a DOD of 80% D. Higher DoD means higher energy. It means, one needs more lead-acid batteries as compared to lithium-ion batteries.

So, when you decide the number of batteries for solar panel in Brisbane, you need to be calculative.

Also Read: How to choose the best solar battery system?

Solar battery size for 3kW

For a 3 kW solar PV system with a daily energy consumption of 5-10 kWh you can use a battery of 4 kWh. It will maximize returns. You can use a 22-kWh battery to maximize energy independence.

If the daily energy consumption is 11-15 kWh, then you should use a 4-kWh battery. average daily energy consumption in an Australian household is 16-20 kWh. You need a 3 kWh battery for that.

Solar battery size for 5kW

For a 5 kW solar PV system with a daily energy consumption of 5-10 kWh you can use a battery of 4 kWh. It will maximize returns. You can use a 35 kWh battery to maximize energy independence.

If the daily energy consumption is 11-15 kWh, then you should use a 7-kWh battery. average daily energy consumption in an Australian household is 16-20 kWh. You need a 6 kWh battery for that.

Solar battery size for 10kW

For a 10 kW solar PV system with 5-10 kWh daily energy consumption, you need a 4 kWh battery to maximize returns or a 35 kWh battery to maximize energy independence. For 11-15 kWh daily energy consumption, you need an 8 kWh battery to maximize returns or a 65 kWh battery to maximize energy independence. If the daily energy consumption is 11-15 kWh, then you should use an 8-kWh battery.