Off-Grid Solar System Sizing Calculator

100up makes Off-Grid Solar Sizing Simple

Use Instant and Simple Off-Grid Solar Sizing Calculator – its based on Aussie averages and over 10 years of Off Grid Solar Installation Experience. It’s the perfect starting point to help point you in the right direction.

How to Use Our Off-Grid Solar Calculator

1. Tell us how many people live at your place
2. That’s it too easy.

Still Not Sure Which System is best for you?

Get a system recommendation in under a minute. Answer 3 quick questions to see the best fit. Need clarity? Use the enquiry form and we will assist.

Also, If you’re running big power-hungry appliances or tend to use more energy, we recommend the Maxi system.

Traditional Solar Sizing vs the 100UP Way

Designing an off-grid system can get pretty technical. But most families don’t need a full-blown spreadsheet of every kettle, fridge, and light bulb. At 100UP, we believe in keeping it straightforward, especially for rural and off-grid homes where simplicity matters.

The Traditional Way (For the Engineers)

Here’s what a full system design used to involve:

• Energy Audit – Listing every appliance, power rating, usage hours
• Solar Sizing – Factoring in your sun hours, especially in winter
• Battery Bank – Sizing storage for days of cloudy weather
• Inverter Capacity – Handling peak power loads and surges
• Efficiency Losses – Accounting for wiring, inverter losses, and real-world use

It’s thorough, but not quick. Great for those who love detail, but not always needed.

The Practical & Proven 100UP Way

We’ve simplified the process for the average Aussie household. Based on what we see day-in, day-out, this method works well:

• Energy Use: 5 kWh per person, per day
• Solar Panels: 2.5 kW per person (ensures winter coverage)
• Battery Storage: 5 kWh per person (covers overnight and cloudy days)
• Inverter: 12 kW system — more than enough for most families

Find your off-grid system size

Answer a few questions for indicative solar, battery, and inverter sizing plus a matched system recommendation.

1. How many people? 1 Occupant 2 Occupants 3 Occupants 4 Occupants 5 Occupants 6 Occupants

2. Ballarat Region?

Yes No

3. Property Type?

🏠 Home 🏭 Workshop

Home uses single-phase; workshop uses three-phase.

Calculate & Recommend

Example Off-Grid Solar System Sizing For a family of four

• 10 kW of solar (4 x 2.5 kW)
• 20 kWh battery bank (4 x 5 kWh)
• 12 kW inverter

This setup gives solid performance with room to grow.

Smarter Design = Better Value

We follow clean energy guidelines, but we also use our heads. Batteries are the most expensive part of an off-grid system — so we build in more solar up front, and keep the battery bank lean. That means lower costs now, and easy battery upgrades later if you need them.

What You Get:

• Lower up-front costs
• Better rebate potential
• Easier upgrades down the track

Continue Your Off Grid Solar Journey

Talk to us about your property, your usage, and your timeline.

Call us direct on 1300 489 152 or send a text to 0400 092 621 — real advice from real off-grid solar installers.

Request a Solar Consultation

Find Your Systems Match

Local Ballarat Team ●  Over 200+ Active Installs  ● 30 Second Instant Match