Off-Grid Solar Power Systems

An off-grid solar system allows you to live with all the comforts or home, in the most remote location.

off-grid-systemOff-grid solar is usually considered when it’s cost prohibitive, or physically not possible, to connect to the grid. It works by using the power from the solar panels to charge batteries which then supply an inverter that powers the house. These systems always require a secondary source of power, usually a generator, to do top up charges and power those large loads such as dishwashers and dryers. Living off-grid usually means a shift in the way we run our houses, for example using a log burner for heating and gas for cooking. It also usually requires the owner to have a good understanding of how the system works, what its capabilities are and how to maintain it.

An off-grid solar system is very site / customer specific and there is a vast amount of system design involved. For example, batteries all have their own personal charge characteristics and ideal charge current. It is important to match the array to the batteries to ensure you are providing the charge that they require, otherwise you risk damaging them prematurely.

batteriesBattery banks have a life expectancy of around 10 years. If you don’t look after them, your batteries could be dead in as little as 1 year. Too often we are called to look at systems that have failed due to poor design and lack of site analysis and technical qualified installation. It is crucial that an off-grid solar system is designed and installed with the knowledge and expertise of the engineering involved. ABW Power Solutions can provide you with that confidence.

ABW Power Solutions only use quality products and are proud to be installers of Century Enersun batteries, SMA and Outback Power inverters and charge controllers.

What does an Off-Grid Solar Power System Cost?

Every system is designed and priced individually. Below is indicative pricing for 2 common systems we install:

7kwh/day consumption

5kw array $7,500
Racking, cables and misc gear $3,045
SMA Sunnyboy 5000 inverter $3,099
SMA Sunny Island 6kW inverter $5,100
Enersun 48V 1025Ah battery bank $17,356
Design, installation and commissioning $5,900
Total Investment (incl GST) $42,000

4.8kwh/day consumption

4kw array $6,000
Racking, cables and misc gear $2,820
SMA Sunnyboy 4000 inverter $2,830
SMA Sunny Island 6kW inverter $5,100
Enersun 48V 700Ah battery bank $11,000
Design, installation and commissioning $5,500
Total Investment (incl GST) $33,250

We always recommend a quality Kohler LPG generator for our off-grid solar systems. Our three primary reasons are:

  1. LPG doesn’t go stale,
  2. LPG generators are considerably cheaper per kW than a diesel alternative,
  3. You cannot damage a LPG engine by idling under low load, which is often the case with off-grid solar systems.

Kohler 6VSG


A specifically designed LPG generator with a 48V DC output for use with renewable power systems. The generator couples directly to the batteries and has its own battery monitoring system which will start the generator if the battery voltage drops below a preset level. It can also start under high load situations to provide additional power, reducing draw on the batteries and increasing battery life.

cost $12,500 incl. GST

Kohler 14RESA


A LPG generator set driven by the same Kohler engine as the 6VSG. This unit delivers smooth 230V AC power which can be used in the house for larger loads as well as to charge the batteries via the inverter / charge controller.

cost $12,495 incl. GST

Contact Us today for a no obligation quote

A successful solar investment can only be achieved by carrying out a correct and comprehensive analysis of the installation site, followed by a quality installation using our trained professionals.
For a free consultation call us today 0800 229 669