Three-Phase Off-Grid Solar Kit – Deye 3 x 12 kW Inverter, 71.4 kWh Battery, 47.5 kW Solar
Commercial & Three-Phase Kits
Off-grid solar kit
3-Bedroom Off-Grid Solar Kit – Deye 2 x 10 kW Inverter, 51 kWh Battery, 29.93 kW Solar
$61,100
Off-grid solar kit for a 3-bedroom home (4 people, about 25 kWh a day): Deye 2 x 10 kW inverters, 51 kWh battery storage and a 29.93 kW solar array (63 panels), and passes the Ballarat July worst-case simulation without a generator. Designed and installed by 100UP.
Passes Worst-Case July
Generator-Free on Day One
Cost-Optimised Design
- Designed for your daily usage and site
- Price includes: Installation. Certification. Solar/Battery rebate STCs. GST inc.
- 10 year manufacturer warranty on inverter and battery.
Indicative price for a standard install. Your final quote depends on site access, distance and the options you choose. see more
29.93 kW
solar Array
20 kW
Inverter Capacity
51 kWh
Storage Capacity
25 kWh/day
Demand Target
Your Off-Grid Solar System Explained
Passes July Simulation
Battery Autonomy
Oversized Array
No Generator Dependency
Cost-Optimised Design
Your Power. Your Property. Your Confidence.
Going off-grid should give you more freedom, without the limitations. With 100UP, your system is designed around your needs, with reliable power through every season.
Additional information
| Bedrooms | 3 |
|---|---|
| Household size | 4 people |
| Daily energy | 25 kWh/day |
| Phase | Single phase |
| Inverter capacity | 20 kW |
| Battery capacity | 51 kWh |
| Solar array | 29.93 kW |
| Panel count | 63 |
| Design basis | Passes Ballarat July worst-case simulation without generator |
| EV charger | No |
| Inverter model | Deye AI-W5.1-10P1-AU-B |
| Battery model | Deye AI-W5.1-B (5.1 kWh) |
| Panel model | Jinko JKM475 475W |
| Mounting | Roof mount |
| ESS Interface | Deye AI-W5.1-PDU3 |
| Inverter configuration | 2 × 10 kW |
System Performance & Winter Modelling
With solar, battery storage and inverter capacity planned together, this system is designed to keep you powered through winter and periods of low solar production.
Designed for full occupancy
Built for worst-case winters
Battery to handle low-solar days
Redundancy where it matters
Off-Grid Power Designed for Real Life
See how we size systems
Solar production
Is the array too big or not big enough?
Summer
Long days and a high sun. A well-sized off-grid array produces far more than a household uses in summer. Put the surplus to work on hot water, pumps or EV charging.Autumn
Output falls steadily from March as the days shorten and the sun sits lower. By May, daily production is well under half of summer’s.Winter
The real test. June has the shortest days and July often brings the longest runs of cloudy weather. Off-grid systems are sized for winter, which is why the array can look large on paper.Spring
Output recovers quickly from September. By October, the system is back in surplus on most days.
What are the worst-month peak sun hours?
Peak sun hours are the equivalent number of hours of full, direct sun your panels receive each day. In Ballarat, the lowest months are June and July. Our Ballarat model averages about 2.4 kWh per day for each kW of panels in July, but individual days can drop well below 1 kWh. Multiply that by the array size for a rough winter estimate.
Figures are modelled. Actual output depends on panel orientation, tilt and shading.
Battery autonomy
How long could this system power your home with zero solar production (worst case)?
Even during cloudy winter weather, your solar panels can still generate some power.
Battery autonomy depends on how much charge is available when solar production drops and how much electricity your household uses. Actual backup time will vary with your usage, battery charge level and any solar power generated during that period.
The calculator below shows how long a fully charged battery could run your home with no solar production at all. Adjust your daily electricity use to see how it affects battery autonomy.
2.0
days
At 25 kWh a day, a full 51 kWh battery runs the house for about 2.0 days (49 hours) with no solar at all.
This kit is designed for 25 kWh/day
Lean household ~15 kWh · Average family ~25 kWh · Large home with heating ~40+ kWh
Modelled from a full battery with zero solar. Real run time depends on how full the battery is and what's running. Covers dark weather, panel faults or maintenance; anything that stops the panels producing.
zero-solar worst-case estimate.
Generator trade-off
What if I accept some generator use?
No Generator Dependency
Long days and a high sun. A well-sized off-grid array produces far more than a household uses in summer. Put the surplus to work on hot water, pumps or EV charging.10% Generator Dependency
The generator covers about a tenth of daily energy use, usually a handful of runs in the darkest weeks of winter. That allows a smaller array or battery and a lower upfront cost.25% Generator Dependency
The generator becomes a regular part of winter. System cost is noticeably lower, but you take on more fuel, noise and servicing.
If I rely on a generator how does that change this systems specs and pricing?
Every off-grid design trades upfront cost against generator use. A little generator time in the darkest weeks can take thousands off the system price. Generator not included in kit price.
Off-Grid Power Designed for Real Life
Understand where Off Grid Backup Generators fit
Good to know
Price: $61,100 supply and install, after STCs. Full price $71,300, less a $10,200 STC discount. STCs are calculated for Zone 4 installs in Victoria. Price updated 1 November 2026.
Backup Power: A generator or backup power source is highly recommended. A backup generator or alternative renewable energy source that automatically kicks in a few times a year during extended winter or stormy weather.
Disclaimer: Final pricing depends on site conditions, roof space, travel, and other site-specific factors. System sizing is theoretical. Performance figures are modelled estimates only and are not a guarantee of output, savings, or payback period. Actual results may vary.
Power what matters, every day
Deye All-in-One Solar & Battery System
A practical, expandable off-grid power solution for households with steady, predictable energy needs. Deye combines hybrid inverter technology with modular lithium battery storage, making it easier to size your system for everyday use and expand as your needs change.
Modular Battery Storage
The Deye AI-W5.1-B uses non-toxic, cobalt-free lithium iron phosphate (LiFePO4) battery chemistry. Each module provides 5.12 kWh of storage, with up to six modules stacked for a total of 30.72 kWh. The modular design makes installation and future expansion straightforward.
Designed for Regional Conditions
The IP65-rated enclosure protects against dust and water, with a wide operating temperature range of -20°C to 55°C. Natural cooling and intelligent battery temperature management make it suitable for a range of installation environments across regional Victoria.
Long Battery Life and Reliability
Rated for at least 6,000 charge cycles and backed by a 10-year manufacturer's warranty. An intelligent Battery Management System (BMS) monitors battery performance, charging and protection during everyday operation.
Remote Monitoring and Easy Control
Deye Smart Cloud provides remote monitoring and system management, with one-click platform installation and registration. The hybrid inverter's LCD display also provides accessible controls for battery charging, AC and solar charging priorities, and acceptable input voltage settings to suit different applications.
Download the Deye AI-W5.1-B Fact SheetSource au.deyeinverter.com Feb 2026
Confidence in Every Kilowatt
Customise & Compare Your Off-Grid System
Adjust the solar, battery storage and backup options to see how each changes your system size and cost. Find the right balance for your energy use, budget and property.
We recommend oversizing your solar array and making the most of available roof space. Adjust panel capacity to suit your roof, budget and winter energy needs.
We recommend at least two days of battery autonomy to help cover cloudy periods. Compare storage capacities based on your daily use and budget.
Two inverters operating in parallel can share demand and provide redundancy if one fails. Compare single and dual-inverter options based on your loads and reliability needs.
We design to minimise generator dependency, with a backup generator available for extended periods of low solar production. Adjust your system to balance battery capacity, cost and backup requirements.
A compatible electric vehicle may offer additional backup power through supported bidirectional charging. Explore how EV integration could fit your system and future energy needs.
Confidence in Every Kilowatt
Your Guide to Going Off-Grid
Explore three essential guides covering system sizing, costs and common questions to help you understand your options and make a confident decision.
Get expert advice
Is This the Right Off-Grid System for You?
Deye
Brand
20 kW
Inverter Capacity
51 kWh
Storage Capacity
29.93 kW
solar Array
Interested in this kit? Tell us about your property, energy needs and plans.We'll help you check whether the system is a good fit and discuss any changes needed before you commit.
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