Table of Contents
- What to Look for in a Solar Battery Quote
- Understanding Battery Capacity and Usable Capacity
- Decoding Power Output and Inverter Compatibility
- Breaking Down Costs: Itemised Pricing and Hidden Expenses
- Solar Battery Quote Checklist: What to Verify Before Signing
- Solar Battery Quote Examples and Comparison
- Warranty Coverage and System Lifespan
- How to Compare Multiple Solar Battery Quotes
- Frequently Asked Questions
Last Updated: October 10, 2026
What to Look for in a Solar Battery Quote
A solar battery quote should spell out exactly what you’re getting, how much it costs, and what happens after installation. Most quotes are confusing because they skip the details that actually matter. You need to know the equipment model, the capacity, the power output, what’s included in installation, and what isn’t.
The best quotes are transparent about every component and cost. The worst ones hide critical information in fine print or skip it entirely.
Equipment specifications and model numbers
The first thing to verify in any solar battery quote is the exact equipment you’re buying. Don’t accept vague descriptions like “premium lithium battery” or “hybrid inverter system.” You need the actual model numbers.
Ask for:
- Battery model and manufacturer
- Inverter model and type (hybrid or standalone)
- Any additional hardware (DC disconnect, surge protection, mounting hardware)
- Warranty details for each component
Why this matters: Different battery models have different performance characteristics, safety certifications, and lifespans. A Tesla Powerwall 2 behaves differently than a LG Chem RESU or a Pylontech battery. The inverter determines whether your system can operate during a blackout and how much power you can draw at once.
When you see the model numbers, verify them yourself. Check the manufacturer’s specifications sheet. Confirm the battery has Clean Energy Council (CEC) approval and complies with AS/NZS 5139:2019 and AS/NZS 3000 standards. These standards ensure your system is safe and won’t create a fire hazard.
Scope of work and installation inclusions
Your solar battery quote should list every task the installer will perform. This is where hidden costs hide. A vague “installation” line tells you nothing. You need specifics.
The scope should include:
- Site assessment and design work
- Electrical rewiring (if needed)
- Battery mounting and securing
- Inverter installation
- All permits and inspections
- Testing and commissioning
- System monitoring setup
- Removal of old equipment (if applicable)
Many quotes skip critical work. Some don’t include the site assessment. Others charge separately for permits. A few don’t even mention commissioning, which is the final testing that proves the system works safely.
Ask your installer: “What happens if my roof needs reinforcement?” or “Who handles the council approval process?” If they’re vague, that’s a red flag.
Understanding Battery Capacity and Usable Capacity
Battery capacity comes in two numbers: total capacity and usable capacity. They’re not the same, and the difference matters for your actual savings.
Total capacity is the amount of energy the battery can theoretically store, measured in kilowatt-hours (kWh). A 10 kWh battery has 10 kWh of total capacity.
Usable capacity is how much of that energy you can actually draw out without damaging the battery. Most lithium batteries can only use 80-95% of their total capacity.
Your quote should state both numbers. If it only mentions total capacity, you’re not getting the full picture. Ask the installer: “What’s the usable capacity of this battery?” If they can’t answer, find another quote.
Usable capacity directly affects how long the battery can power your home during a blackout or how much solar energy you can store on a sunny day.
Decoding Power Output and Inverter Compatibility
Power output and capacity are different. Capacity tells you how much energy the battery holds. Power output tells you how much power it can deliver at any moment, measured in kilowatts (kW).
Your home’s appliances have peak power demands. A kettle might draw 3 kW. A pool pump draws 1.5 kW. If you run both at once, you need 4.5 kW available. If your inverter can only deliver 3 kW continuously, it will shut down.
Your quote should show:
- Continuous power output (what the inverter can deliver indefinitely)
- Peak power output (what it can deliver for short bursts)
- Battery power output (separate from inverter, in some cases)
The inverter is the critical piece. It converts DC power from the battery into AC power your home uses. A hybrid inverter also manages solar panels and the grid connection.
Ask your installer: “Can this system power my air conditioner and my pool pump at the same time?” If the answer is no, you need a bigger inverter or you’ll face blackouts even when the battery is full.
Breaking Down Costs: Itemised Pricing and Hidden Expenses
A proper solar battery quote breaks down every cost. Line-by-line transparency is the standard you should expect. If the quote lumps everything into one number, ask for a detailed breakdown.
A complete quote includes:
- Battery unit cost
- Inverter unit cost
- Mounting and hardware
- Electrical labour (per hour or fixed)
- Permits and inspections
- Commissioning and testing
- Monitoring software (if applicable)
- Removal of old equipment
- GST (if applicable)
Hidden costs often appear after the quote. Watch for:
- Additional wiring or electrical work discovered during installation
- Roof reinforcement if the roof can’t support the weight
- Trenching or conduit work if cables need to run underground
- Upgrading your switchboard or electrical panel
- Site access difficulties
A reputable installer will flag these risks upfront. They’ll conduct a thorough site assessment and note any complications. If a quote seems unusually cheap, ask what assumptions it’s based on. Is the roof easily accessible? Does the switchboard have spare capacity? Are there any obstacles?
Solar Battery Quote Checklist: What to Verify Before Signing
Before you sign a contract, verify every detail on your solar battery quote. Use this checklist to catch missing information or unrealistic claims.
Equipment verification:
- Battery model number matches manufacturer specs
- Battery has CEC approval certificate
- Inverter model and power rating are listed
- All serial numbers or part codes are present
- Warranty documents are attached or referenced
Performance specifications:
- Total capacity (kWh) is stated
- Usable capacity (kWh) is clearly shown
- Continuous power output (kW) is listed
- Peak power output is specified
- Round-trip efficiency is mentioned (if available)
Installation scope:
- Site assessment is included
- Electrical work scope is detailed
- Permits and inspections are covered
- Commissioning and testing are listed
- Removal of old equipment is noted (if applicable)
Pricing breakdown:
- Each component has a separate line item
- Labour costs are itemised
- Permits and fees are shown
- GST is calculated correctly
- No vague “miscellaneous” charges
Warranty and support:
- Battery warranty period is stated (typically 10 years)
- Inverter warranty period is listed
- Workmanship warranty is included
- Post-installation support is described
- Monitoring and maintenance terms are clear
Contract terms:
- Payment schedule is outlined
- Start and completion dates are specified
- Cancellation terms are stated
- Dispute resolution process is listed
- Insurance and liability coverage is mentioned
If any of these items are missing, ask for them in writing before you sign.
Solar Battery Quote Examples and Comparison
Understanding a real quote helps you spot what’s normal and what’s unusual. Here’s what a typical quote structure looks like, broken down line by line.
A standard residential solar battery system quote might include:
| Component | Typical Detail | What It Means |
|---|---|---|
| Battery | 10 kWh LG Chem RESU | 10 kWh total capacity, 9 kWh usable |
| Inverter | 5 kW hybrid inverter | Can deliver 5 kW continuously |
| Installation labour | 16 hours at standard rate | Electrical work to connect everything |
| Permits and council approval | Fixed fee | Local council paperwork and inspection |
| Monitoring software | 12-month subscription | App to track battery charge and usage |
| Commissioning | Included | Final testing to ensure system works |
| Total system cost | Varies by location | Everything above combined |
When comparing multiple quotes, look for consistency in what’s included. One installer might include monitoring for free. Another might charge extra. One might include council permits. Another might say you pay separately.
The cheapest quote isn’t always the best value. A quote that’s significantly lower than others might be missing important work or using lower-quality equipment. A quote that’s much higher might include unnecessary extras or premium pricing.
Compare apples to apples: same battery model, same inverter, same labour scope. Then the price difference becomes meaningful.
Warranty Coverage and System Lifespan
Battery warranties vary widely, and they’re crucial to understand. A good warranty protects your investment if something fails.
Most lithium batteries come with a 10-year warranty covering defects in materials and workmanship. Some warranties are “full replacement” for the first 5 years, then degradation coverage for the remaining 5 years. Others use a “capacity fade” warranty: if the battery drops below 80% of its rated capacity before 10 years, the manufacturer replaces it.
Your quote should spell out:
- Warranty period (years)
- What’s covered (manufacturing defects, capacity fade, etc.)
- What’s not covered (damage from misuse, water damage, etc.)
- Replacement or repair process
- Warranty on the inverter (usually 5-10 years)
- Workmanship warranty from your installer (typically 5 years)
System lifespan is different from warranty. A battery might be warrantied for 10 years but last 15-20 years in practice. Inverters often need replacement around 10-15 years. Your installer should explain realistic lifespan expectations.
Ask about degradation: “How much capacity will this battery lose each year?” Most modern lithium batteries lose 1-2% capacity per year. Over 10 years, that’s 10-20% degradation. Your quote should account for this in savings projections.
How to Compare Multiple Solar Battery Quotes
Getting one quote isn’t enough. You need at least 2-3 quotes from different installers to understand the market and spot outliers.
When comparing quotes, use a consistent framework:
Step 1: Verify equipment is identical
Make sure all quotes use the same battery model and inverter. If one quote uses a LG Chem battery and another uses a Pylontech, the prices won’t be comparable. Ask each installer to quote the same system so you can isolate the pricing difference.
Step 2: Check the scope of work
Confirm all quotes include the same tasks. Does one include monitoring setup and another doesn’t?
Step 3: Calculate the total cost
Add up all line items, including GST. Some installers quote before GST and some after.
Step 4: Identify hidden costs
Look for items that might appear later. Does the quote assume your roof is easily accessible?
Step 6: Assess installer credentials
All installers should be CEC accredited. Check their reviews and ask for references.
Write down your findings in a spreadsheet. List the equipment, the total cost, the warranty, and any concerns.
Reading a solar battery quote properly takes time, but it protects you from costly mistakes and ensures you’re getting fair value.
Frequently Asked Questions
What should a solar battery quote include?
A complete solar battery quote must list the exact battery model and inverter model, battery capacity in kilowatt-hours (kWh), usable capacity, continuous and peak power output in kilowatts (kW), itemised installation costs, total system price, warranty terms for both the battery and workmanship, scope of work, and any exclusions. It should also specify whether rebates like the Cheaper Home Batteries Program are factored in, and clarify what happens during blackouts or grid outages.
What is the difference between a battery’s usable capacity and its nominal capacity?
Nominal capacity is the total energy stored in the battery, while usable capacity is the amount you can actually draw from it. Most lithium batteries protect their lifespan by preventing you from fully draining to zero per cent or charging to 100 per cent. For example, a 10 kWh battery might have only 9.5 kWh usable capacity. Always check the usable capacity figure in your quote, it determines how much power is genuinely available for your home during outages or peak periods.
How do I compare solar battery quotes from different installers?
Create a comparison sheet listing battery model, usable capacity, power output, total installed cost, warranty length, and scope of work for each quote. Verify that all quotes use the same battery and inverter models so you’re comparing like for like. Check whether rebates and incentives are already deducted or quoted separately. Compare the warranty terms, product warranty typically covers 10 years, but workmanship warranty varies. Ask each installer to explain any cost differences and what is excluded.
Does a solar battery quote include backup power during a blackout?
Not automatically. A battery can provide backup power only if the quote includes a hybrid inverter and proper isolation equipment to disconnect from the grid during an outage. Standard grid-connected systems without these components cannot operate during blackouts. Check whether the quote specifies hybrid inverter installation and essential loads wiring. Also verify the battery’s continuous power rating, it must be sufficient to run your essential appliances simultaneously during a blackout.