We design off-grid solar systems to operate without a generator by sizing for full household occupancy, not current usage. Every system is modelled around realistic energy demand, poor winter solar production, inverter and battery redundancy, and roughly 48 hours of battery autonomy. The result is an off-grid system designed to work through winter, support future occupants, and protect long-term property value.
We design conservatively – for real energy use, real energy use, worst-case winter conditions, redundancy, and long-term property value.
To provide a clear starting point, we work from common household scenarios based on bedroom count, not minimum current usage.
We typically design reference systems for:
These are not fixed packages. They are design reference points that allow us to model realistic energy demand and ensure systems remain functional long term.
When we are sizing an off Grid solar system for your property our baseline assumption is:
Not because everyone uses the same amount of power. They don’t. But because an off-grid system has to support the property, not just the current routine. For example:
This avoids under-sizing systems based on short-term living arrangements or unusually low usage.
Even if a home is currently occupied by fewer people, we design systems to support full, realistic occupancy.
Living arrangements change. Families grow. And many off-grid properties are eventually sold.
If you build a 3- or 4-bedroom home, the energy system should be capable of supporting a fully occupied household, not just the current occupants.
Under-sized systems are one of the main reasons off-grid homes end up relying on generators later.
For off-grid properties, the energy system is not a secondary feature, it is core infrastructure.
When an off-grid property goes on the market, buyers pay close attention to:
A weak or generator-dependent system can reduce buyer confidence and, in many cases, property value.
A properly designed, generator-less off-grid solar system:
This is why we design systems for the future owner, not just the current one.
Redundancy is critical for generator-less operation.
Where practical, we design systems with:
If a component fails, the system can continue operating while repairs are arranged.
While we always aim to resolve faults as quickly as possible, the reality of off-grid systems is that:
Redundancy reduces the risk of being forced back onto a generator due to a single point of failure.
Winter is the true test of any off-grid system, and the most commonly underestimated.
We design on the assumption that:
By designing for worst-case winter production, systems remain stable and predictable, rather than marginal and generator-dependent.
Battery autonomy is a key factor in achieving genuine off-grid independence.
Battery storage is sized for approximately:
This allows the system to:
A generator-less off-grid system needs four things working together:
We design systems that are theoretically capable of operating without a generator under normal Australian off-grid conditions.
That’s the benchmark we design to:
not minimum compliance,
not best-case weather,
and not short-term usage.
Every property is different. If you’d like to discuss your block, your energy use, and what an off-grid system would look like, get in touch with Fred at 100UP.
A two-bedroom off-grid home can serve many roles. It might be a permanent residence, a holiday property, or somewhere that regularly hosts family and visitors. The design needs to account for how people actually live.
Larger properties tend to experience greater variation in power use. Family gatherings, guests, holiday periods and short-stay accommodation can all create sharp increases in demand that smaller systems struggle to handle.
