2018 Guide To Solar Battery Storage Systems

Home \  Blog \  2018 Guide To Solar Battery Storage Systems

2018 Guide To Solar Battery Storage Systems

01 November, 2017

Battery Storage - What It Is & How It Works

Solar power is a great alternative energy. It not only takes the burden off the environment but it also helps to reduce your power bill. However, there is one slight drawback: The sun is at its fullest during the middle of the day. This means that the best time to use your most power-hungry appliances is during this time – when most of us are at work. To get around this issue, it could be beneficial to install battery storage along with your solar power system.

 

Utilising Self Consumption of Solar Power

Of course, if you work from home or are retired, doing your washing, vacuuming your floors and using the dishwasher during the day is not a problem. If you spend most of your day away from home, then you could simply put all of your appliances on a timer so they can switch on while you are out.

Imagine it: You close the door behind you to head off to work while the appliances, set on individual timers, get busy doing your housework. As soon as the sun gets to its brightest, the dishwasher flicks on. The washer-dryer gets to work while the robotic vacuum starts on the floors. About an hour before you get home the heat pump clicks on ensuring that you arrive home to a warm (and clean) home.

 

Battery Storage

However, if you are not a fan of complicated appliances and don’t see yourself changing your daytime habits, another option available, when you install a solar power system, is to also install battery storage.

Previously, residential battery storage was considered an uneconomical add-on for the average Kiwi family. However, due to the decreasing cost of batteries, installing a battery storage solution alongside your solar power system may be a good idea.

Battery storage takes the pressure off the need to use the majority of your energy during the middle of the day when the sun is at its brightest. This is because any energy that is not used as it is generated, is sent to the battery storage unit to be used at a later time.

With battery storage, you can utilise your solar energy production by using it at times that suit you, like at night to cook, use electronics or watch T.V.

 

Battery Storage: How does it work?

When the sun shines on your solar panels, the panels, through the use of photovoltaic cells, convert the sunlight into DC electricity. A solar inverter then converts this into AC electricity which can then be used to power your home.  When an excess of power is being generated that is not required to power the home, it is used to charge the batteries. The power is converted to DC electricity, then stored in the battery for use at a later time.  Once the sun has gone down there is no more immediate power available, the two-way inverter then converts the power back into usable AC electricity.

Once the batteries are fully charged, any further excess power produced is sold back to the grid. If you’re selling more power back to the grid than you are drawing from it, this could result in a nice tidy credit from your retailer.

Battery Ready Solar Power Systems

While the idea of battery storage may appeal to you, it may not yet be an affordable option for your family. This is where HRVs battery ready solar power system can be a great advantage. It gives you the option of installing your solar power system now so that can you can start enjoying the perks of a reduced electricity bill, with the intention of installing battery storage at a later date.

When it comes to purchasing high-cost electronics, there’s always a fear that within a few short months your products may become obsolete. With a battery ready solar power system, you can rest easy knowing that your system will be future-proofed to allow for battery installation at a later date – when battery prices have hopefully dropped.

 

Tesla Powerwall 2

Tesla’s new Powerwall 2 home battery is a great addition to any solar power system. It stores double the energy of the previous Powerwall 1 and the stackable, slim-line design allows it to be wall or floor mounted and either stored inside or out.

What’s more, it comes with a built-in two-way inverter, able to convert your energy between storable DC and usable AC electricity

With advancements in solar energy and battery storage technology occurring all the time, solar power systems with battery storage could soon be an affordable, eco-friendly option available to all New Zealand families.

 

Battery Storage Prices NZ

When you’re shopping for the best battery storage for the needs of your family it pays not just to look at the cost of the unit but also the features it provides. You’ll want to make sure you get the right unit to support the size of your home and the electricity needs of the people who live with you.

For example, if you are intending to use your solar power system to get you through a blackout, then you’ll be after battery storage with Hybrid unit capabilities. This is because all grid-connected solar units are automatically shut down during blackouts to prevent solar power being fed back to the grid during a time when linesmen may be repairing the lines. A hybrid unit can be switched to off-grid mode during a blackout, allowing you to use your solar power and charge your battery with any excess.

Below is a chart that gives you a breakdown of the costs and special features of some of the popular battery storage models currently on the market.

 

Battery Storage Price Comparison

Solar Battery System

Tesla Powerwall 2

LG CHEM RESU

Sonnen

Panasonic

Enphase ac battery

Solax-box

Model

 

14kWh

RESU 6.4 EX

 8.2 Eco

LJ-SK84A

   AC Battery 1.2 KWH

X-Hybrid Series

Usable Storage

 

13.5 kWh

5.12kWh

2kWh is usable.

8.0kWh

1.14kWh per battery

2 x 2.4kWh batteries, 3.84kWh is useable. 

Product Warranty

 

10 years

10 years

10 years

10 years

10 years

5 years

Includes Inverter

 

YES

NO

YES

TBC

YES

YES

Off-Grid/Hybrid option

 

YES – Hybrid only

YES

YES – Hybrid only

YES

NO

YES

Whether it is an economical option to install battery storage now depends greatly on how much sun falls on your property, how remote your property is and how you intend to use your solar power. The good news is that when you go solar with HRV you can rest easy knowing that your solar power system will be future proofed for whatever you choose to do further down the track.

 

Latest articles

How Solar Panels Work In New Zealand
12 September, 2017
How Solar Panels Work In New Zealand
We’ve all heard about the use of solar panels to reduce our power bill, lower our effect on the environment and live a more self-sufficient lifestyle, but not many of us know how solar panels actually work.
How Much Sunshine Does Auckland Receive?
01 November, 2017
How Much Sunshine Does Auckland Receive?
Before investing in a solar power system we need to think economically and weigh up the ongoing benefits provided by solar panels against the upfront costs of installation. In the same way that you would want to know how windy a location is before installing a wind turbine, it pays to know just how much solar energy falls on your section each year and how much of that you can expect to capture.