The short answer is usually no, especially if you're looking to power an entire off-grid home or property that you live in or plan to live full-time. That doesn't mean power stations don't have their place. They can be an excellent solution for camping, tiny little cabins (non-full-time living) with a few lights and plugs, emergency backup power, and individual appliances. But powering an entire property is a very different challenge. Here's why.
A power station isn't the same as an off-grid solar system
The biggest misconception is thinking about an off-grid system simply in terms of how many appliances you can plug into it. In reality, an off-grid system needs to do three things:
- Generate enough electricity
- Store enough electricity
- Deliver enough power when you need it
A portable power station generally combines a battery and inverter into one compact unit. You can then add solar panels or additional batteries depending on the model. That's convenient, but when you start trying to power an entire property, the amount of energy you need can quickly become much larger than you might expect.
The real question is "How much power does my property actually use?”
Think about everything you might want to run:
- Fridge and freezer
- Lights
- TV and entertainment
- Wi-Fi and internet equipment
- Washing machine
- Dishwasher
- Microwave
- Kettle
- Coffee machine
- Water pump
- Pressure pump
- Heat pump
- Electric hot water
- Tools and workshop equipment
- Cooking appliances
- Computers and other electronics
Individually, many of these appliances don't seem like a big deal. The problem is that their energy consumption adds up. And some appliances don't just use electricity continuously. They can draw a significant amount of power when they start or when they're operating at full load. For example, a kettle might only run for a few minutes, but it can draw around 2,000 watts while it's running.
A water pump might have a relatively small average consumption, but its startup demand can be considerably higher. Now imagine several of these appliances operating at the same time. That's where a small portable power station can quickly reach its limits.
We always recommend using our Solar Calculator to get a better idea of what system is right for you and give you peace of mind that you're sizing your system correctly.
There’s a difference between “can run off-grid” and “designed for off-grid”
This is an important distinction that often gets overlooked. Some power stations and solar systems can technically operate without the grid. But that doesn't necessarily mean they're designed to be the primary power system for an entire off-grid property.
When you're connected to the grid, you have a huge backup sitting outside your house. Need a sudden burst of power to start a large motor? The grid supplies it. Use more electricity than your solar system is producing? The grid fills the gap. Does something need to be updated or restarted? You still have another source of power.
When you're genuinely off-grid, there is no grid to fall back on. Your energy system is the grid. That changes what you should be looking for.
1. Handling sudden power demands
One of the biggest differences is how an inverter handles surge loads.
Some household appliances can require significantly more power when they start than they use once they're running. Pumps, compressors, refrigerators, and other motor-driven appliances are good examples.
That's why we use TBB low-frequency inverter technology in our systems.
The design is heavier and less focused on portability, but it's built to handle high surge loads more robustly. When you're off-grid, that's important because there's no mains grid sitting behind your inverter to provide extra current when something starts up.
A portable power station might have an impressive continuous power rating, but what matters in an off-grid property is how the entire system behaves when multiple loads start and stop throughout the day.
2. Reliability when your power system is also your internet connection
Another consideration isn't immediately obvious.
When you're off-grid, your solar system may be powering your internet connection, communications, monitoring equipment and everything else you rely on to manage your property. That means the system needs to be designed to operate reliably without depending on a constant internet connection.
Our TBB equipment is designed to operate reliably without requiring autonomous online firmware updates.
When an update is initiated, the firmware is downloaded locally before the update process begins, helping minimise interruption to power.
That's a small detail, but when your solar system is your only source of electricity, small details matter.
3. Working with a generator instead of simply switching to one
A generator is often an important part of a larger off-grid system, particularly as backup during periods of poor weather. But a generator doesn't necessarily need to be sized to run your entire property and charge your batteries at the same time.
TBB's Power Assist technology allows the system to work alongside the generator more intelligently. You can set a limit for how much power the generator should provide. When your household load is below that limit, the available capacity can be used to charge the batteries.
If there is a temporary increase in household demand, the batteries can assist the generator to meet that extra demand. At the same time, solar can continue contributing to both your household loads and battery charging.
The result is a system that can make much better use of a smaller generator rather than simply relying on a large generator to carry the entire property.
4. Automatically knowing when backup power is needed
When you're off-grid, you don't want to be constantly watching your battery percentage and wondering: “Do I need to start the generator yet?”
A properly designed system can take care of this automatically.
Our systems can be configured with automatic generator start, using parameters such as:
-
- Battery state of charge
- Excessive inverter load
- Other system conditions
For example, if your batteries reach a critically low level, the system can automatically start the generator to recharge them before the batteries are depleted.
Likewise, if there's a temporary demand that exceeds what the inverter should provide on its own, the generator can be triggered to provide additional power. That's the difference between having a collection of equipment and having an energy management system working together.
5. Making use of excess solar without wasting your stored energy
Solar production doesn't always line up perfectly with when you use electricity. You might generate more solar power than your household needs during the middle of the day, while your biggest loads happen in the evening.
This is where Smart Load functionality can be useful. Our TBB systems have a second AC output that can be configured for non-critical loads.
For example, you can configure certain loads to switch on when your batteries are full or solar production is high, making use of energy that might otherwise go unused. You can also configure those loads to switch off when the battery drops below a certain level.
That means non-essential loads don't accidentally drain your batteries overnight and leave you without enough stored energy for the things that matter.
It's about the whole system, not just the battery
This is why choosing an off-grid system based purely on battery capacity or inverter wattage can be misleading.
You could have a system with a large battery and impressive headline specifications that technically works without the grid.
But a system designed specifically for off-grid living needs to consider what happens when:
- A pump starts while other appliances are running
- Solar production suddenly drops
- Your batteries are getting low
- The weather stays poor for several days
- You need backup from a generator
- Your generator can't handle the entire household load
- Your internet and communications rely on your solar system
- Solar production exceeds your immediate household demand
- You accidentally use more electricity than expected
That's the difference between a system that can operate off-grid and a system designed to keep you powered off-grid. And that's exactly what we think about when designing an off-grid system for a GridFree customer.
Battery capacity is only part of the equation
You'll often see power stations advertised with battery capacities such as:
1,000Wh, 2,000Wh, 5,000Wh or more.
Wh stands for watt-hours, and it tells you how much energy the battery can store.For example, a 2,000Wh battery theoretically stores 2kWh of energy. That sounds like a lot until you start looking at everyday household consumption. If you had an appliance using 1,000 watts continuously, a 2,000Wh battery would theoretically provide around two hours of runtime. And that's before accounting for things such as inverter losses and the fact that you don't necessarily want to drain the battery completely.
Of course, most appliances aren't running continuously at their maximum rated power. But the example illustrates an important point: battery capacity can disappear surprisingly quickly when you're running a whole property.
Then there's the inverter
Battery capacity isn't the only limitation. You also need to look at the inverter's output. The inverter converts the battery's DC electricity into the AC electricity your household appliances use. A power station might have plenty of battery capacity but still not be able to run certain combinations of appliances because its inverter can't supply enough instantaneous power. Imagine you're using at the same time:
- a kettle
- a microwave
- a fridge
- a water pump
- several lights
The total demand can quickly exceed the inverter's output capacity. This is one of the reasons an off-grid system needs to be designed around the way you actually use electricity.
And then comes the biggest challenge: tomorrow
This is where the difference between a power station and a properly designed off-grid solar system really becomes apparent. It's not enough to have enough electricity right now. You need to have enough electricity tomorrow morning, tomorrow night, and potentially the day after that.
Your solar panels need to generate enough energy to replace what you've used. On a sunny day, that might not be a problem. But what happens when it's cloudy? What happens during several days of poor weather? What happens when your household uses more electricity than usual? This is why off-grid systems are designed around more than just battery size.
You need to consider: Solar generation + battery storage + inverter capacity + your actual energy usage.
“But can't I just add more batteries?”
Sometimes, yes. Many power stations allow additional battery capacity to be connected. But there's an important distinction between adding battery storage and building a system designed to power an entire property.
If you keep adding batteries without increasing your ability to generate enough solar energy, you may simply have a bigger tank without enough water coming into it. Your solar array needs to be capable of replenishing that battery bank. And your inverter needs to be capable of handling the loads you're putting on the system. Everything needs to work together.
What about using multiple power stations?
You might also be thinking: “Why not just buy two or three power stations?”
In some situations, that can work, but once you're combining multiple units, batteries and solar inputs, you're moving away from the simplicity that made the portable power station attractive in the first place, which also may end up costing more.
For a permanent off-grid property, you're generally better off having a system designed specifically around the property rather than trying to build one by connecting several portable solutions together.
So, how big does my off-grid system actually need to be?
There isn't one answer that works for everyone. A small weekend cabin with a few lights and a fridge has completely different requirements from a permanent family home with electric cooking, hot water, pumps and heating. That's why we don't recommend choosing a system solely based on your property's size.
Instead, you need to look at how you use electricity. We can help you work through things like:
- What appliances you want to run
- How much electricity you're likely to use
- How much solar generation you'll need
- How much battery storage makes sense
- What inverter capacity you'll require
- Whether you need additional backup
- How your system could be expanded in the future
Don't buy the battery before working out what you actually need
One of the easiest mistakes to make when going off-grid is buying a solution first and trying to make it work afterwards. The better approach is to start with your energy needs. Once you understand what your property requires, you can choose a system that's designed to meet those requirements.
A power station might be exactly what you need, or it might be completely undersized for what you're trying to achieve. The important thing is finding that out before you spend the money.
Want to find out what you actually need?
If you're planning an off-grid property and aren't sure whether a power station, solar kit or larger off-grid system is right for you:
Ask the team → or
Use our Solar Calculator→
We'll help you work through your energy requirements and find a solution that's suited to the way you actually want to live.