Solar batteries come in different sizes. Some batteries are suitable for small systems while larger solar panels arrays will be better paired with a larger battery.
The tables below show the best quality batteries according to their size:
|Sungrow||5 kWh||Good||6,000 cycles||10 Years||Very good|
|Enphase||1.2 kWh||Good||3,650 cycles||10 Years||Good|
The three best batteries for small solar power systems are:
The Sungrow battery is a well-priced small to medium size battery. At 4.8kWh, the battery is large enough to service smaller panel arrays. So far, the Sungrow battery has performed well during reliability testing.
The Enphase battery comes in 1.2kWh units that can be added to at any point in time. The Enphase solar battery is an AC battery capable of being fitted to any system. One downside to the batteries is that they do not have backup power functionality.
The Sofar battery is a VERY cheap small to medium size battery. At 5.2kWh, the battery is large enough to service smaller panel arrays. So far, the Sofar battery has performed well during reliability testing.
|Duracell||9.6 kWh||Good||6,000 cycles||10 Years||Very good|
|LG Chem||10 kWh||Good||4,000 cycles||10 Years||Good|
The two best battery storage options for larger household grid-connect systems are:
The Duracell Energy Bank 2 can be fitted to any grid-connect system. It is reasonably priced and represents reasonable value for money and has performed well during recent testing.
The LG Chem battery is one of the most popular in Australia. You can take some comfort in the fact that LG have a large and vested interest in the solar market with their quality panels, and now batteries.
Both the LG Chem and Duracell Energy Bank II batteries are a good battery size for a 5kW system.
Adding solar battery storage to your system will allow you to save extra dollars, but it will come at a price. Solar batteries are relatively expensive, and the payback period is longer than for solar panels.
It is more economical to include solar battery storage as part of a new solar power system as opposed to adding a battery to an existing system. The table below shows typical solar battery prices for new systems, and adding to existing systems.
|5 kWh battery||6.4 kWh||10 kWh||14 kWh|
|Adding to existing:*||$7,700||$9,000||$12,500||$15,700|
The table shows that the average cost of solar batteries is around $1,000 / kWh. This figure can be used as a rough guide; if you want a 10kWh with a new system, expect to add around $10,000 to the cost of the solar panels.
If you already own solar panels, and are wanting to add a battery, you may need to pay for an additional inverter and charger. If you purchased a battery ready system, you will likely avoid this additional cost, provided the battery you select is compatible with your hybrid inverter.
The cost of a hybrid inverter and charger varies depending on the size of the battery you need, but typically adds over $2,000 to the cost of the install.
There are several variables that will affect the price you ultimately pay for a solar battery. The size, brand and quality of the battery you choose will have a big bearing on the price, as will any add-ons you may opt for. Battery price variables include:
The solar battery prices and payback periods we refer to above do not include any battery rebates. There are state-based rebate schemes that can significantly decrease the cost of solar batteries and in turn shorten the payback period.
Typically, a panel and battery system will payback somewhere between 5 – 7 years. If you already own solar panels and are just adding a battery, the payback is far greater, more like 7 – 10 years.
To assess the viability of battery storage, we will compare the results for a 6.6kW system with a 10kWh battery in Brisbane– with no battery, buying a panel and battery together and adding a battery to an existing system:
|Cost||Annual savings||Payback period||Longevity|
|Panels only:||$5,650||$1,601||3 Years||25 years|
|Hybrid system:||$14,150||$2,243||6 Years||10 years|
|Battery only:||$10,500||$642||16 Years||10 years|
YES, all of the latest articles are based off OLD pricing from 2017 when batteries were 3x the price and not financially viable. The prices have dropped significantly and are 100% now a better option than getting money back on a feed in tariff especially when you can purchase them factory direct from South East Solar & Maintenance.
This size system is perfect for power bills under $300 all the way up to $450 per quarter. If you do the math on a $300 power bill you are currently paying $25/week for electricity and you can expect to pay $14,000 with no returns. (this accounts for inflation)
This size system is perfect for power bills from $500 to $800 per quarter. If you do the math on a $500 power bill you are currently paying $41/week for electricity and you can expect to pay $25,000 with no returns. (this accounts for inflation)
This size system is perfect for power bills from $900 to $1100 per quarter. If you do the math on a 1,000 power bill you are currently paying $83/week for electricity and you can expect to pay $46,000 with no returns. (this accounts for inflation)