Calculate
Your Domestic
PV System
Professional photovoltaic design with array layout, stringing, inverter matching and bankable yield simulation. Sized to your bills and project needs, not sponsorships. Use a free PV calculator first, and if you need a more detailed design, leave it to us.
Size Your Roof's PV Potential
You have two ways to calculate your solar system's size: enter your bill, or pick the appliances you run. Our automated calculator handles the math and gives you an optimized rooftop PV solution.
Curious what the equipment itself costs?
The estimate above sizes your system. If you want a sense of the underlying hardware costs, panels, inverters and batteries by brand, our Energy Prices page tracks indicative market averages you can use for early budgeting, ahead of a formal quote.
What You Receive from Renwaves
We'll offer an installer-ready solar solution with no guesswork left for your roof. Every package is produced with AI assistance and personally reviewed by our engineering team before delivery.
Array Layout & Stringing
Module placement, string configuration and shade-aware orientation, drawn to scale on your roof.
Yield Simulation
Monthly & annual production forecast with a full loss diagram. AI runs the simulation fast; an engineer verifies it before it becomes the numbers your bank will accept.
Inverter & BOS Sizing
Inverter matching, cable sizing, protection devices and mounting structure specification.
Single-Line Diagram
Grid-compliant SLD your installer and utility can approve without a single question.
Financial Model
LCOE, payback and savings scenarios with sensitivity analysis and every assumption shown.
Permit & Grid Papers
Documentation set for building permit and grid-connection application, ready to submit.
Not sure? Talk to an engineer
Skip the guesswork. A short call with the person who will actually run your numbers.
// Fixed fee · You choose the brand · Engineer-led adviceApply for a Project
Ready when you are
Tell us about your site. We'll reply with a scope and a fixed quote within 48 hours.
Questions, answered
The questions every client asks before starting.
01How accurate is the online calculator?
It's a screening tool, expect ±15–20%. The paid design replaces every assumption with your real data: climate files, shading model, tariff structure, that's how we reach ±6% model accuracy.
02Do I need a battery?
Only if your usage pattern justifies it. We model self-consumption with and without storage and show you the payback of both, many clients discover PV-only wins first, battery later.
03What do you need from me?
Site address, twelve months of utility bills, and any roof plan or photos you have. No drawings? We work from satellite imagery and a quick site checklist.
04Will my installer & utility accept the design?
Yes. the package ships with a grid-compliant single-line diagram and permit-ready documents. If your installer has questions, we answer them directly, engineer to engineer.
05How long does it take?
Five to seven working days for a standard residential system. Larger or multi-roof projects are scoped individually at application.
06Is AI used in your PV system design?
Yes. We use AI tools to speed up yield simulation and layout drafting, but every design is reviewed and signed off by an engineer before it's delivered. AI handles the heavy lifting; a human is always responsible for the final numbers.
Designed by engineers, built by trusted pros
Our network connects people who plan energy projects with vetted local installers and technicians.
Need a solar installer?
Have a PV design or a roof in mind? Tell us where you are and we connect you with vetted local solar installers and technicians.
Install solar systems?
Join our partner network to get listed in our directory and receive project enquiries from people planning solar projects.