Thinking about going solar but feel like you need an engineering degree to make sense of all the terms being thrown around? You’re not alone. Between kilowatts and kilowatt-hours, single and three-phase, DC vs AC coupling, and talk of “blackout protection,” the jargon can make it hard to compare quotes or understand what you’re really getting.

This glossary-style guide breaks it all down – in plain English – so you can make confident, informed decisions about your solar and battery system.

Kilowatts (kW) vs Kilowatt-hours (kWh)

These two terms sound similar but mean very different things.

• kW (kilowatts) measures power – how much electricity something can produce or use at a given moment. For example, a 6.6kW solar system can produce up to 6.6 kilowatts of power under ideal conditions.
  
• kWh (kilowatt-hours) measures energy – the amount of power used over time. For example, if you run a 1kW appliance for 5 hours, you’ll use 5kWh of energy.

Think of it like a car:

• kW = engine size
  
• kWh = distance you travel with that engine over time

Single-phase vs Three-phase power

Your home’s connection to the electricity grid will either be single-phase or three-phase.

• Single-phase power is common in most suburban homes. It delivers electricity through one active wire and one neutral wire.
  
• Three-phase power is typically found in larger homes or properties with high power demands (like big air conditioners or workshops). It uses three active wires, providing smoother, more stable power delivery.

Think of it like a car:

• kW = engine size
  
• kWh = distance you travel with that engine over time

Why it matters:
Three-phase properties can usually support larger solar systems and batteries. If your home is single-phase, you might be limited in system size, and certain large batteries or inverters may not be compatible. In the majority of cases, a single phased system will do the job you need.

AC-coupled vs DC – coupled systems

When pairing solar panels with a battery, there are two main ways to connect the components: AC coupling and DC coupling.

DC-coupled System

• Solar panels generate DC (direct current) power.
  
• In a DC-coupled setup, this DC electricity flows directly into the battery before being converted to AC for your home.
  
• This method is more efficient because energy is only converted once (DC → AC).
  
• Ideal for new solar and battery installations designed together.

AC-coupled System

• In an AC-coupled setup, the solar panels first convert their DC power to AC for the home and grid, using a solar inverter.
  
• When the battery stores excess energy, it must be converted back to DC for storage, and then again to AC for use – meaning two conversions.
  
• Slightly less efficient, but more flexible.
  
• Great for retrofits – adding a battery to an existing solar system.

Example:
If you already have a solar system and want to add a battery later, AC coupling makes sense. If you’re starting from scratch, a DC-coupled system will be a bit more efficient and integrated.

Blackout Protection

Many Australians assume that if they have solar, they’ll still have power during a blackout – but that’s not always true.

Here’s why:

• Most standard solar systems are grid-tied, meaning they automatically shut down during an outage for safety (to protect lineworkers fixing the grid).
  
• That means no power, even if the sun is shining.
  

To keep the lights on during an outage, you need a battery system with backup capability.

How blackout protection works:

• Backup power is usually limited to essential circuits, not your entire home.
  
• These are things like the fridge, lights, Wi-Fi, and some power points – not high-load appliances like ovens or air conditioning.
  
• During a blackout, you can switch the home energy supply to battery power, so those essential circuits stay running.
  
• If your solar system is configured for it, the panels can keep charging the battery during daylight hours, even while the grid is down.

Battery Chemistry Types

Not all batteries are made the same. The main differences come down to battery chemistry – the materials used inside.

• Lithium Iron Phosphate (LFP): The most common and safest chemistry on the residential market today. Excellent thermal stability and long lifespan.
  
• Lithium Nickel Manganese Cobalt (NMC): Higher energy density, but can be more volatile and less heat-resistant.
  
• Lead Acid: Older, cheaper technology with much shorter lifespan and lower efficiency. Rarely used for home systems now.
  

In short: LFP is the preferred option for home batteries in Australia thanks to its safety, longevity, and cost-effectiveness.

Virtual Power Plant (VPP)

A Virtual Power Plant connects many individual home batteries into a network that can be managed collectively to support the grid.

By joining a VPP, your battery can export stored energy when the grid needs it – and in return, you receive payments or bill credits.

Example:
During a hot summer night, demand on the grid spikes when lots of people keep their aircon running to stay comfortable. The VPP releases some of your battery’s stored power to the grid and you earn credits or cash for participating – all automated.

Reading your electricity bill

Your electricity bill contains valuable clues about your energy habits.

Key sections to look for:

• Average daily usage (kWh) – tells you how much energy your household consumes each day.
  
• Usage charges – the cost per kWh.
  
• Supply charge – a fixed daily cost just for being connected to the grid.
  
• Feed-in tariff (FIT) – how much you earn for exporting solar power back to the grid.
  

Average household usage by state:

• NSW: ~ 17–20 kWh/day
  
• SA: ~ 15–18 kWh/day
  
• VIC: ~ 13–16 kWh/day
  
• QLD: ~ 20–25 kWh/day

If your bill shows higher usage than your state average, you could potentially increase savings more with solar and a battery.

Feed-in Tariffs (FITs)

A Feed-in Tariff is the rate your electricity retailer pays you for any solar power you export back to the grid.

FITs have decreased over the years because more households now have solar and daytime power prices are lower – which makes battery storage more valuable, since you can store and use your own energy later rather than selling it cheap.

Solar Inverter

The inverter is the brains of your solar system. It converts DC electricity from the panels into AC electricity that your home can use.

Common types include:

• String inverters (most common)
  
• Micro inverters (attached to each panel for better performance in shade)
  
• Hybrid inverters (can manage both solar and battery storage)

The Bottom Line

Solar energy is one of the smartest investments you can make – but only if you understand what you’re buying.

By learning the key terms and concepts, you can cut through the jargon, compare systems properly, and make sure your setup suits your home, lifestyle, and energy goals.

Thinking about going solar with a battery?
Chat with a ShineHub Energy Expert to explore your options, understand your savings, and find the right solution for your home.

Must sign up to the ShineHub VPP. ShineHub VPP terms and conditions apply.
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