Find the solar and battery option that fits your bill.

Understand enough to have a better conversation and avoid being pushed into the wrong investment. Enter a few bill details to compare starter, payback-focused, and larger bill-reduction options before booking a proper design check.

Use this guide to understand what size solar and battery option may suit your home. This is not a quote and does not provide final pricing. A solar professional must still confirm your roof layout, shading, switchboard, network approval, product availability, rebates and final design.
Compare my quote Compare brands Start with my bill Access Pro

Already have a quote? Jump straight to Compare My Quote, then come back to the bill section if you want the estimate to use your own usage.

Start simple, then open the extra checks if you need them.

Most people only need three steps first: tell us the home details, add a bill, then review the options. Quote comparison, brand checks, backup questions and privacy details are still here, just not forced on you at the start.

Choose what you want to check

The simple path is Home, Bill and Options. The other sections are there when you want to compare a quote, check brands, understand backup, or prepare questions for an installer.

Step 1 of 10

Your Home

Start with your postcode. The app will use broad location assumptions, and you can adjust the advanced assumptions if you know them.

Already have solar, a battery or an EV? Add that context here so the estimate does not treat a grid-import bill as the whole home load.
If you already have solar, a battery or an EV, add it here first. Bills often miss solar used inside the home before it reaches the meter.
Advanced assumptions

Advanced assumptions are optional settings that make the estimate more specific. You can leave them as they are for a first look, or open this section if you know more about the home, the panels being considered, or the local solar/rebate assumptions.

When to use this section: adjust these fields if a solar professional has told you your home is single phase or three phase, if your roof has noticeable shade, if you want to test a different panel wattage such as 475W or 600W, or if you want the STC zone and solar yield assumptions to better match your location. If you are not sure, leave the defaults and ask your installer to confirm them.
Enter a postcode to auto-set likely state, solar yield, and STC zone factor. Confirm exact STC zone using the official CER postcode zone list.
Panel count currently uses 475W modules. You can change the panel wattage in Advanced assumptions, or choose custom to add your own preferred panel size.
Check official CER postcode zone list

Your Bill

Use more than one bill where possible. Multiple bills smooth out seasonal heating/cooling, holidays, and one-off usage spikes, so the options are less likely to be oversized or undersized.

Drop electricity bills here or click to upload multiple PDF/text bills. The app will fill dates, usage, bill amount and tariffs where it can.
No bill uploaded. You can select more than one bill at a time. If upload is blocked by your browser, enter the bill rows manually below.
Please check any extracted bill details before relying on the estimate. Bill PDFs can be read differently depending on the retailer layout, so usage, dates, charges and tariffs should be reviewed before sharing results.
Privacy note: in this standalone version, uploaded bills are read in your browser to help fill the bill fields. The app does not intentionally upload, save, or store your bill file or personal information on a server. Your file may still remain wherever you keep it, such as your device, downloads folder, email, cloud storage, backups, or browser temporary storage.
Already have solar? Many bills show grid import and solar export, but not the solar energy your home used directly before it reached the meter. If you already have solar, include inverter/monitoring data or ask your installer to check total solar generation before using this as an expansion or battery sizing estimate.
Manual entry tip: Usage kWh means the energy used or imported for that bill period. Do not enter meter reads, account numbers, solar export totals, lifetime inverter generation, or dollar amounts in this field.
Bill period Start date End date Days Usage kWh Bill amount $
Advanced bill assumptions

Leave these as defaults for a first look, or adjust them if you know the rates from the bill.

Import tariff

Look for general usage, anytime usage, peak usage, or energy charge. It is usually shown as cents per kWh, for example 30c/kWh means enter 0.30.

Off-peak tariff

For time-of-use plans, enter the off-peak rate and the approximate percentage of imported kWh billed off-peak. Leave the percentage at 0 for a flat-rate plan.

Feed-in tariff

If you already have solar, look for solar feed-in, export credit, or feed-in credit. If it says 4c/kWh, enter 0.04.

Daily supply charge

Look for supply charge, service charge, daily charge, or fixed charge. If it says 129c/day, enter 1.29.

Check the details

Use GST-inclusive rates where possible. If your bill has peak, off-peak, shoulder, controlled load, or demand charges, use the main household usage rate as a simple first estimate.

Your Goal

Pick the outcome that matters most. The recommended card will adjust to match it.

What payback means: payback is the estimated number of years for bill savings to equal the estimated net system cost after assumed rebates. It is a simple guide only; it does not include finance costs, tariff changes, maintenance, battery degradation, or future energy price changes.

Estimate Summary

These numbers update from the bill, postcode and advanced assumptions above.

Want to change these figures? Update your bill rows, postcode/region, tariff assumptions or panel wattage. The summary will recalculate automatically.
Edit bill usage and bill amount Edit postcode / home details Edit advanced assumptions

Your Options

These are screening options only. Use them to decide what is worth designing properly.

How the savings are estimated: the app annualises your bill usage, estimates how much solar is used in the home, how much battery energy can shift into the evening, and how much is exported. Annual after bill is the estimated 12-month grid import cost plus 365 days of supply charges minus yearly feed-in credit. Annual saving is your current estimated annual bill minus that annual after bill.
Rebate disclaimer: STC values, federal battery discounts, and state rebates are estimates based on the current year and the assumptions in this tool. Scheme rules, certificate prices, postcode zone factors, eligible products, and available funding can change, so rebates must be confirmed before a customer quote or purchase decision.
Practical minimum sizing: generated options round up to about a 5 kW solar system where needed, because very small systems such as 4 or 5 panels are usually poor value and may not suit common inverter ranges. If your usage is low, the smallest option may be larger than the strict coverage target for this reason.

Customer Summary

A print-friendly guide to show an installer, retailer, or supplier what sort of system you are exploring.

Compare My Quotes

Already have a quote? Drop it here or enter up to three quotes side by side. The app gives a first-look reality check against your bill usage so you can see size, price, payback and follow-up questions in one place.

Got a solar quote? Drop it here for a first-look reality check PDF/text quotes can auto-fill system size, battery size, price and claimed savings where the wording is clear. Photos or scanned quotes may still need manual entry.
No quote uploaded. You can also type the quote details manually below.

Quote 1

Quote 2

Quote 3

What this checks: rough system size, battery size, claimed savings, simple payback and whether each quote appears broadly similar to the generated options. It cannot confirm roof fit, product quality, installer workmanship, finance terms, hidden exclusions, network approval, rebates, or whether the price is fair for the actual site work.

Compare Brands

Pick the product type and choose up to three brands. This gives you an evidence-based snapshot: warranty, Australian support presence, warranty pathway, technical support, likely price position, and what the quote should clearly show.

Important: this is a consumer guide, not a brand ranking. It focuses on evidence you can ask to see: warranty terms, Australian support contacts, who handles claims, whether site attendance is available, current datasheets, CEC approval details and written inclusions.
Add your own notes

Battery Backup

A battery does not automatically mean your home will have power during a blackout. Backup must be designed, wired, and quoted as part of the battery system.

What backup means

Backup is when selected circuits can keep running from the battery when the grid is out. Some batteries are storage-only, some can back up selected circuits, and some systems can be designed for larger backup loads.

What it cannot do

Backup is not unlimited power. It only works while the battery has enough charge available, and large loads like ovens, ducted air conditioning, pool pumps, hot water, EV chargers, or multiple appliances may not run unless the system is specifically designed for them.

Switchboard work

Backed-up circuits usually need switchboard assessment and may need circuit separation, a backup changeover arrangement, labelling, testing, and Type A RCD/RCBO protection on altered or backed-up circuits.

When it is worth it

Backup can be valuable in blackout or brownout prone areas, or for essentials like fridge, lights, internet, medical equipment, garage doors, or water pumps. If outages are rare, the extra backup cost may not be worthwhile.

Backup cost reminder: ask the installer to quote backup separately from battery storage. Backup runtime depends on the battery charge level, battery size, solar generation during the outage, and which appliances are running. The final cost can change depending on switchboard space, existing RCD/RCBO types, which circuits are backed up, and whether extra board work is needed. A licensed electrician must confirm what is compliant for the site.

Questions To Ask When Getting Your Quote

Use these questions to compare quotes properly and avoid being rushed into a system that does not suit your home.

System and design

  • What system size are you recommending, and why does it suit my bill and usage?
  • How many panels are included, what wattage are they, and will they actually fit my roof?
  • Have shading, roof direction, roof pitch, setbacks, and usable roof space been checked?
  • What inverter are you using, and is it suitable for my home supply phase and network/export limit?

Battery and backup

  • Is the battery being recommended for savings, backup, or both?
  • If backup is included, which circuits are backed up and what will not run during an outage?
  • How long might backup last with normal use, and what happens if the battery is low when the outage starts?
  • What switchboard work, Type A RCD/RCBO upgrades, changeover equipment, testing, and labelling are included?

Price, rebates, and paperwork

  • Is this a fixed quote, and what could cause the price to change after site inspection?
  • Which rebates, STCs, battery discounts, or state incentives have been included, and are they guaranteed?
  • Are panel, inverter, battery, labour, switchboard work, monitoring, metering, and network application fees all included?
  • Will I receive a written quote, product datasheets, warranty documents, terms, cooling-off rights, and NETCC disclosures if applicable?

Company and after-sales support

Using subcontractors is not automatically a problem. The important thing is knowing who manages the work, what standards they require, and who remains responsible after installation.

  • Who is the retailer, who is the installer, and who do I call if something goes wrong?
  • Are you local, and if subcontractors are used, how are they selected, accredited, supervised, and held to your installation standards?
  • Who handles warranty claims, monitoring setup, faults, and service after installation?
  • Can I have everything promised in writing before I pay a deposit?
This is not a quote, customer contract, NETCC document, network approval, or final electrical design. Prices, rebates, STCs, roof fit, shading, switchboard capacity, export limits, and product availability must be checked by a solar professional.
Privacy Policy

Privacy Policy

Effective date: 26 June 2026.

Welcome to Prima Renewable Compass. This Privacy Policy explains how we collect, use, disclose and safeguard information when you use our website, including the solar sizing guide, battery recommendation guide, compare quote tools, feedback forms and related services.

By using this website, you agree to the practices described in this Privacy Policy.

Information we collect

Information you provide: name, email address, phone number, property address, suburb or postcode, electricity bill or usage information, household size, roof type or property details, solar system preferences, battery preferences, electric vehicle ownership or charging requirements, and any additional information you submit through forms or correspondence.

Information collected automatically: IP address, browser type and version, device information, operating system, date and time of visits, pages viewed, referral source, cookies and similar tracking technologies.

Electricity bills may contain personal information such as a name, address, account number, national meter identifier, retailer details and usage history. Only upload a bill if you are comfortable using it in this tool.

How we use your information

We use your information to generate personalised solar and battery guidance, estimate suitable system sizes, estimate battery storage options, respond to enquiries, improve the website and calculator, analyse website performance, detect and prevent fraud, security incidents and misuse, and comply with legal or regulatory obligations.

Where you have provided consent, we may send marketing communications about solar energy systems, battery storage, rebates, special offers and related products or services. You can opt out at any time using the unsubscribe instructions in emails or by contacting us directly.

Uploaded bills and local handling

Uploaded bills are read in your browser to help fill the bill fields. The current browser-based guide does not intentionally upload, save or store your bill file on a Prima Renewable Compass server unless you separately submit information through a form or other website feature.

Your bill may still remain wherever you keep it, such as your device, downloads folder, email, cloud storage, backups or browser temporary storage. If you print, download, screenshot or share a summary, you control what you share and who receives it.

Installer information and third parties

Our website may provide downloadable information, guides or directories relating to solar installers and other industry service providers. Downloading or accessing this information does not result in your personal information being shared with any installer or third party by us.

If you choose to contact an installer directly using information we provide, any information you share with that installer is governed by their own privacy policy and terms. We do not sell your personal information to unrelated third parties. We only disclose personal information where required by law or where you have authorised us to do so.

Automated recommendations and disclaimer

The website uses automated calculations, algorithms and, in some cases, artificial intelligence to generate estimated solar system sizes and battery recommendations. These recommendations are based on information you provide and assumptions about energy consumption, solar production and battery performance.

Recommendations are estimates only, may not account for all property-specific factors, should not be relied upon as engineering, financial or electrical advice, and should be independently assessed by a qualified solar professional before any purchasing decision is made.

System sizes, energy production estimates, battery capacities, cost savings, rebate eligibility and payback calculations are estimates. Actual results will vary depending on roof orientation, shading, local weather, electricity tariffs, installation quality, equipment selected and household energy usage. Nothing on this website is a formal quotation.

Marketing, cookies and analytics

If you choose to receive updates, we may contact you by email, SMS or telephone about solar offers, battery promotions, government rebate information, new products and energy-saving tips. We comply with the Australian Spam Act 2003 and will only send commercial electronic messages where permitted by law.

We may use cookies and similar technologies to improve website functionality, remember preferences, analyse website usage, measure advertising effectiveness and deliver relevant content. You can disable cookies in your browser settings, although some features may not function correctly.

We may use third-party services such as Google Analytics, Google Ads and Meta Pixel to understand website usage, measure advertising performance, improve user experience and deliver relevant advertisements. These services may collect anonymised or pseudonymised information using cookies and similar technologies.

Security, retention and your rights

We use reasonable administrative, technical and physical safeguards to protect information against unauthorised access, disclosure, alteration, loss and misuse. No method of transmitting information over the internet is completely secure.

We retain personal information only for as long as necessary to provide requested services, respond to enquiries, maintain business records, comply with legal obligations and resolve disputes. When information is no longer required, we securely delete or de-identify it where practical.

Subject to applicable laws, you may request access to your personal information, correction of inaccurate information, deletion, withdrawal of consent, objection to certain processing activities, or a copy of your personal information.

External websites, children and overseas providers

Our website may contain links to external websites. We are not responsible for the privacy practices, policies or content of those third-party websites.

The website is intended for adults considering residential or commercial solar installations. We do not knowingly collect personal information from children under 16 years of age.

Some technology providers may store or process information outside Australia. Where this occurs, we take reasonable steps to ensure information receives an appropriate level of protection consistent with applicable privacy laws.

Australian privacy compliance

We handle personal information in accordance with the Privacy Act 1988 (Cth) and the Australian Privacy Principles. If you believe we have breached your privacy, you may contact us so we can investigate your complaint. If you are not satisfied with our response, you may lodge a complaint with the Office of the Australian Information Commissioner.

Changes and contact

We may update this Privacy Policy from time to time. The updated version will be published on this page with a revised effective date. Your continued use of the website constitutes acceptance of the updated Privacy Policy.

Contact: Prima Renewable Compass, primaperform@yahoo.com.au.

What Happens Next

A proper design program and installer review should confirm the option before anyone relies on it.

1. Share a billUse a recent bill or interval data if available.
2. Check roof fitConfirm panel layout, shading, and usable roof area.
3. Check networkReview phase, export limits, voltage rise, and approval pathway.
4. Get a quoteConfirm products, rebates, warranties, terms, and final price.

Feedback

Help shape Prima Renewable Compass before it is opened more widely. Tell us what was clear, what was confusing, and what would make the guide more useful.

Feedback submissions are handled by the website form service and are intended to be sent to Prima Renewable Compass at primaperform@yahoo.com.au. Please do not include unnecessary account numbers, full addresses or highly sensitive information in this feedback form.

Installer and Retailer Partners

This is a future pathway, not the advice itself. We are not listing partners yet. If partner listings are introduced, participation will be paid and each listing will be assessed and labelled against Prima Renewable Compass criteria so customers can see why a business is shown.

Listing clarity: Prima Renewable Compass partner listings are paid and clearly labelled. Businesses are assessed against Prima Renewable Compass criteria such as service area, experience, design process, disclosure standards and after-sales support. Paid participation does not replace these criteria.
Partner interest

Are you an installer?

If you value informed customers, this tool is being built to help people arrive with a clearer bill summary, system goal, backup expectations, and questions to ask before quote stage.

Potential partner criteria may include service area, NETCC status, battery experience, design process, warranty support, and after-sales service.

Retailer pathway

Are you a retailer?

This tool is designed to help customers understand their bill, compare rough system options, and arrive with better questions before they speak with a retailer.

For retailers, the value is a clearer conversation around product choice, availability, finance, warranties, installation arrangements, and whether the proposed system actually suits the customer.

Professional tool

Professional sizing option

We also have a professional sizing tool that can be used alongside design software such as OpenSolar, Pylon, or other design workflows. It is for sizing, coverage, costing, VRC, quote readiness, and customer option comparison.

Installers and retailers can use it to turn a consumer's rough summary into clearer quoting assumptions before committing time to full design, site checks, and final proposal work.