What size battery do I need?
The size of battery storage that’ll be beneficial to you will be dependent on:
- Your households daily energy usage
- How much excess energy your solar power system generates and;
- How much independence you want from the grid
As an example, if you are using 6kWh of the 16kWh your solar power system is generating during the day and you expect to use at least 10kWh of power at night (common for a household with 9-5 pm workers) a 10kWh battery will store this excess power for you to be able to use at night, once your solar power system is no longer generating energy from the sun. This means unless you go over that 10kWh of power you won’t need to use any additional energy from the grid.
Before deciding which battery size is right for you, you should breakdown your daily power usage and how much electricity your solar power system is generating. You can do this with your power bill or a monitoring device.
From there you can calculate how much power you use and the excess you can store.
See below for current prices and brands out in the market.
Just want an idea of the price range to expect when considering battery storage for your solar power system? See a snapshot of some of the available batteries in today’s market below.
Learn the different factors and specifications of batteries that can affect pricing and ROI here
|Enphase AC Battery||1.2kWh||$2,000 (Fully installed)|
|Sonnenbatterie Eco 9.43||15kWh||$16,500|
|ELMOFO E-Cells ALB52-106||5.5kWh||$8,190|
|Delta Hybrid E5||6kWh||$6,600|
|Leclanche Apollion Cube||6.7kWh||$9,200|
|Tesla Powerwall 2||14kWh||$11,700|
|Sonnenschein @ Home Lithium||8.5kWh||$10,109|
|Hybrid “Home” Plus||9.84kWh||$11,000|
|Senec.home Li 10||10 kWh||$12,500|
|BYD B-Box RES||10.24 kWh||$7,500|
|Sunverge SIS||11.6kWh||$26,000 (Fully installed)|
|Magellan HESS||12.8 kWh||$20,600|
Last Updated November 2019
* Nominal storage (when filled to the brim, which is not recommended for battery life)
** Price is approximate and may not include installation
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