4,100+ Australian homes analyzed · Powered by
NASA POWER AEMO / NEM Bureau of Meteorology Clean Energy Council 30-year climate data
Quick calculator
What could solar
save you?
No signup needed. Enter your last quarterly electricity bill and see your estimated saving.
My last electricity bill
$ per quarter
$1,170
saved per year
6.3yr
payback period
$108
est. new quarterly bill
$3,120
STC rebate (upfront)
Based on 10kW system · Melbourne irradiance · $14/mo Pro unlocks full design
Quarterly electricity bill comparison Before solar $450/qtr With Jouli solar $108/qtr SAVE + $3,120 STC rebate upfront
How it works

From postcode to
proposal in minutes.

13 guided modules across your complete energy profile. Each audience gets the depth they need — no jargon, no pressure.
01
Profile your load
Add appliances or upload your bill. Your daily energy curve is the foundation.
Free
02
Size your solar
30 years of NASA irradiance data for your postcode. Adjust tilt and orientation live.
Free
03
Add battery + EV
Model storage and EV charging together. See how solar hours change your payback.
Pro
$$$
04
See the economics
Payback period, LCOE, NPV — or just "you'll save $2,840/year." Plain language.
Pro
05
Check resilience
How many days off-grid in winter? Stress-tested against real worst-case weather.
Pro
06
Export your report
A professional PDF proposal. Walk into any installer meeting knowing your numbers.
Business
What makes Jouli different

Built for Australia.
Built for everyone.

Every other tool is too simple or too expensive. Jouli is the first to serve homeowners, installers, and engineers in one product.
Real Australian solar data
NASA POWER 30-year climatology for every Australian postcode — validated against BOM surface stations.
Solar + EV + battery together
4.1M solar rooftops (CER 2026). 410,000 EVs (Electric Vehicle Council, 2025). Jouli is one of the only tools that models all three as one home energy system.
Live NEM tariff data
Feed-in tariffs and network charges updated from AEMO. Your economics always reflect what you actually pay.
Honest accuracy
Every number shows a confidence range. We tell you what we don't know and why a site visit closes the gap.
AI insights in plain language
"Adding a battery saves you $940/year" — not "optimise your self-consumption ratio through storage arbitrage."
Professional PDF reports
Branded, compliant, ready to share. Walk into an installer meeting knowing your numbers cold.
Early access

Join Australian homeowners
designing smarter energy.

4,100+
Homeowners on the early access list
Across VIC, NSW, QLD, SA, WA and TAS
10s
Postcode to solar estimate
Powered by 30 years of NASA satellite data
13
Energy modules
Solar, battery, EV, V2G, heat pump, off-grid and more
AU solar rooftops (CER 2026)
Zero
referral kickbacks. Ever.
30yr
NASA climate data
Pricing

Start free. Go deeper when ready.

No pushy upsells. No installer kickbacks. Jouli makes money when you subscribe — not when you click through to a quote.
Full energy system
Solar + basics
Free
Homeowners exploring solar
$0
forever
✓
Load profiler
✓
Solar sizing engine
✓
Basic ROI estimate
✓
Basic ROI summary
Most popular
Pro
Homeowners with solar or EV
$14
per month
✓
Everything in Free
✓
Battery + EV modelling
✓
NEM tariff data (updated quarterly from AEMO)
✓
Resilience analyser
✓
Smart EV scheduler
Installer toolset
Business
Installers & consultants
$79
per month
✓
Everything in Pro
✓
Branded PDF proposals
✓
Multi-site management
✓
Client portal + API

Ready to understand
your energy future?

Onboarding early users across Australia — starting in Melbourne.

No spam. No installer referrals. Just Jouli.

CEC-accredited · No referral kickbacks
← Back to design
Find a trusted installer
Every installer listed is CEC-accredited.
Jouli does not receive referral fees — ever.
100%
CEC accredited
$0
Referral fees
3
Quotes recommended
0 installers selected · Get all 3 to quote on your Jouli design
State:
All states
VIC
NSW
QLD
WA
SA
TAS
Speciality:
All
Solar
Battery
EV charging
Commercial
Off-grid
Showing all installers
Are you a CEC-accredited installer?
Claim your free listing or upgrade to Jouli Business for verified badge, featured placement and lead notifications.
Demo mode
Example data · simulated
← Back to design
⚠️
SIMULATED DATA
Connect your inverter or upload a NEM12 file for real numbers
Live energy flow
Today's generation (kWh)
12am6am12pm6pm11pm
This month
System performance
Environmental impact
Connect your inverter for live data
Currently showing simulated data based on your Jouli design. Connect your inverter to see real-time generation.
$14
per month · cancel anytime
✓
Battery sizing engine
✓
EV charging scheduler
✓
V2G / V2H modeller
✓
Live NASA postcode API
✓
Unlimited scenarios
✓
Save & return designs
✓
Smart EV scheduler
✓
Resilience analyser
No credit card required for trial · Cancel anytime · Billed via Stripe
$14/month after trial · First month free
Let's personalise
your energy design.
Takes 30 seconds. Or skip and start exploring.
I am a...
Homeowner
Exploring solar or battery
EV owner
Want to charge smarter
Installer / consultant
Building proposals for clients
Just researching
Exploring my options
1. Location
2. Load
3. Solar
4. Battery
5. EV
V2G
Grid
Heat pump
Resilience
Off-grid
STC
Economics
Report
Saved
Discover ▸
Location
Load profiler
Solar sizing
Economics
Design Pro ▸
Deploy Business ▸
Your system
Location—
Daily load—
Solar—
Battery—
Annual gen.—
Savings—
📍—
☀️— kW
💰—/yr
📊— yrs
⚡— kWh/yr
AI
Jouli AI advisor
Powered by Claude · general solar advice
Hi! I'm your Jouli AI advisor. Enter your postcode and design your system first — then I can give you personalised advice about solar, batteries, EVs, and tariffs based on your actual numbers.
How does solar work in Australia?
What is an STC rebate?
How do I read my NEM12 file?
Upload your NEM12 file for personalised advice