Battery Storage

There are 2 types of battery storage systems to consider.

  1. Battery power for night time consumption (the most common type of battery system e.g. Enphase or Tesla)
  2. A battery UPS system where you will still have power during a power outage.




1.Enphase AC Battery



The Enphase AC Battery is an integrated energy storage system that delivers high performance, superior reliability, modular architecture, and safety.
• Capacity: 1.2 kWh for each battery
• Depth of discharge: >95%
• Roundtrip cell efficiency: 96%
• Peak output power: 270 VA
• Chemistry: Lithium Iron Phosphate (LFP)
• Cell safety certifications: TUV Rheinland, UL

Enphase Energy, a US-based energy technology company and the world’s largest manufacturer of micro inverters, has recently announced that Australia will be the launching pad for its ground-breaking AC Battery, which will be available next year. The Enphase AC Battery is a modular, expandable energy storage solution worthy of the company that brought micro inverter technology into the mainstream.

The Enphase AC Battery will offer a fresh approach to home energy storage – one unlike anything else on the market. Most storage systems are comprised simply of a battery bank and a battery or hybrid inverter, which converts the DC electrical energy (which the batteries store) into usable, appliance-friendly AC electricity.
Storage systems may also come in the form of all-in-one, plug-and-play devices from a single manufacturer, or be designed by an engineer to use components from different manufacturers. The former are simple to design and install, while the latter are more flexible with regard to sizing and system layout. The innovative genius of Enphase’s AC Battery is that it combines the advantages of both types of systems: plug-and-play simplicity with a high degree of flexibility.

Each Enphase AC Battery unit contains a 1.2 kilowatt-hour (kWh) lithium-ion phosphate (LiFePO4) battery, an Enphase S-series micro inverter and Enphase’s Enlighten communications software. Units can be easily mounted onto a wall with a single set of hands in any number of configurations and arrangements – and more units may be added as necessary, should the system require expansion in the future. This means that a home can install 4 units for a total of 4.8kWh of storage with the option to increase the capacity to 6kWh, 7.2kWh, 9.6kWh or more further down the road.

Enphase Solar Battery Modularity

Enphase AC Battery units can be installed on a wall in any number of configurations – and can be easily expanded in the future if necessary or desired.

Enphase AC Battery installation

Storage systems using Enphase’s AC Batteries are easy to design and install.

From a homeowner’s perspective, the AC Battery highly appealing in that it allows them to size an energy storage system to suit their individual needs and budget. But it is the bigger picture applications that make it even more exciting: Enphase’s AC Batteries and their software help to facilitate greater uptake of solar on the electricity grid by rectifying some of the issues inherent with high solar PV penetration rates, including power quality stabilisation and protection against over-voltage in local networks.

Key benefits:
• Simple, modular and wall-mountable, the battery system can be arranged in a number of configurations and capacity sizes.
• Easily expandable for growing energy needs.
• Dependable, long-life and ultra-safe LiFePO4 battery chemistry with high depth of discharge (DoD).
• Intelligent energy management system helps to maximise utility bill savings and battery life.
• Greater overall system resilience compared to conventional storage systems thanks to modularity and inverter redundancy. For example, one unit going offline will not impact other units.
• Highest round-trip efficiency at 96%.
• 10+ year life with two cycles daily.
• Seamless, whole-of-system communication and online monitoring accessible from anywhere with Enphase’s Enlighten software.

2. Selectronic SP PRO GO Inverter with Battery Storage


Selectronic is an Australian company, founded in 1964 by the Scott family. In 1981 the company’s electronics products division was established to meet a need for quality power conversion products in the emerging renewable energy market.

Selectronic Australia’s products form the heart of efficient, cost effective storage based renewable energy systems including Solar Hybrid and Off Grid systems.

This versatile grid feed inverter offers the ability to store energy in and use energy from a battery storage system. Whether you wish to install a new solar hybrid system or update your existing renewable energy system to Solar Hybrid, the SP PRO provides the solution.

Being compatible with most forms of renewable energy including DC and AC coupled PV Solar, micro hydro and wind, the SP PRO can be incorporated into virtually any grid tie system.

Security of Backup Power

During a power outage, the SP PRO solar hybrid systems will supply the load from the renewable energy source whilst storing any excess energy in the battery bank to be used as needed. This gives the user continuous power and peace of mind.


3.Tesla Power Wall


More information coming soon…….



Overview of Solar Power Systems with Battery Storage

Battery storage solar systems are the most effective way to get the most from a solar power system. When you’re not home during the day your solar power is sent out into the grid with little to no benefit to you as feed-in tariffs are as little as 7 cents and most homes usually consume the largest part of their power bill at night. By using batteries to store your solar power you can reduce your power bills to a fraction of what they normally are or even have no power bills at all.

Our Lithium Iron Phosphate batteries come with their own sophisticated battery management system to ensure they are never damaged during charging or providing power to your home. We have models available with a service life of up to 10 years. They take up very little space and they are relatively maintenance free and can be charged quickly.
Down South Solar Power can help you establish your solar battery storage system. We use the finest lithium batteries for solar to make sure our clients end up with a long-term, cost-effective solution. Read on to find out how it works, and contact us for a customised quote.

About half of Down South Solar Power customers are asking about energy storage for solar power, but few have a clear idea of how much battery capacity they need. We will now take a look at the factors that come into play when considering how to choose the right amount of battery capacity for your solar-plus-storage system.
How much energy independence do you want?

Many of the customers who approach us about energy storage options say that they want to go ‘off-grid’, but that’s not the only reason to have an energy storage system installed. While this may be a popular aspiration, taking your home or business off-grid is more often than not financially impracticable or just not possible to do with solar-plus-storage alone (especially if you have limited roof space for panels). What is often more practical is a strategy of reducing reliance on the grid instead.

The list below presents the most popular uses of energy storage, sorted in descending order from greatest degree of energy independence to lowest degree of energy independence.

1. 100% energy independence (literally ‘off-grid’): Install enough solar, energy storage and other technology (small-scale wind, generator, etc) to meet all of your electricity needs. In this case you’ll need to install enough capacity to last you several days because you won’t have the grid to back you up.

2. High energy independence (winter self-sufficiency, summertime surplus): Install enough solar and battery storage to get you through the average winter’s day without having to rely on the electricity grid (even though you’re still connected). You’ll produce excess solar power to export to the grid during the summer and will have enough to get you through the shortest winter’s day. You will likely have to rely on the grid as a backup if there is a multi-day spate of bad weather during which your solar panels haven’t managed fill up your battery bank.

3. Summertime independence (grid reliance in winter): Install enough solar and battery storage capacity to get you through the average summer’s day. During the winter (and possibly autumn and spring) you’ll have to draw power from the grid to meet deficits.

4. Peak time independence: Install a system large enough to cover your electricity usage when grid electricity is most expensive. If you’re on a time-of-use (TOU) billing agreement with your electricity retailer, you’ll pay more for electricity from the grid during peak and shoulder times (4pm-7:59pm and 8pm-10pm, respectively), so it would be in your best financial interest to reduce your reliance on the grid during these periods.

5. Reduced grid reliance during peak times: If you can’t afford to install enough energy storage to cover your peak time usage, you can still install enough to at least reduce your grid reliance during these periods.

What other factors do you need to consider in sizing your energy storage system?

Choosing the right energy storage system capacity can be significantly more complicated and subjective than deciding on the right solar PV system size – mainly because of the greater number of variables involved. The factors involved include:

• Desired degree of energy independence (as discussed above).

• The amount of electricity you use: If your electricity consumption level is low (under 20kWh/day), it will be easier and more affordable to install a solar-plus-storage system that will meet your daily needs. If your usage is higher, the outlay for a system that will meet your daily needs will also be more substantial; you may wish to look at ways to reduce your electricity consumption, or consider a lower degree of energy independence.

• Your electricity usage pattern: According to the analysts at Sunwiz, there are five basic residential electricity usage patterns in Australia:
1) Double Peak
2) Evening Peak
3) High Day & Evenings
4) Day Focus and
5) Night Focus.

• The size of your solar PV system: If you have a pre-existing solar system onto which you’re planning on retrofitting energy storage, this will weigh heavily on how much storage capacity you can or should get. If, for example, you are currently exporting lots of solar to the grid at low feed-in tariff rates, you may want a larger amount of storage capacity to capture it. If, on the other hand, you’re installing a new-build solar system, it’s usually the wisest move financially to make sure it only produces enough electricity to meet only your daytime electricity demand and have a small energy storage system to capture any excess that would otherwise be ‘wasted’ on grid export. However, if greater energy independence is your goal, oversizing the solar system and installing a large battery bank is an option – and may even stack up financially, especially if you’re on TOU metering.

• The orientation of your roof/solar panels: North-facing solar panels will generate more power than east or west-facing panels, but a west-facing array will generally do a better job of meeting your household’s electricity demand during peak & shoulder times.