GreenWattWise LabComplete buying system
Home Battery Buyer Toolkit
What exactly will this toolkit help you do before accepting a home-battery quote? Evaluate it — on your own terms, using your own numbers.
The problem
Installer quotes are genuinely difficult to compare side by side. Different installers can make different assumptions about battery capacity, usable capacity, inverter power, backup functionality, future consumption, warranty terms, and system configuration — and describe them in different terms. That's not necessarily dishonesty; it's what happens when there's no shared standard for how a quote is presented. Either way, the buyer is the one who ends up comparing apples to oranges unless they build a consistent way to line the quotes up.
What it helps you evaluate
- Whether the quoted battery capacity actually matches your household
- How to compare specifications across quotes that describe things differently
- What warranty terms actually mean in practice
- A structured checklist for the decision itself, not just the numbers
What's included
- Before You Buy a Home Battery — Essential Edition guide
- Home Battery Decision Calculator (Excel-based)
- The full 91-page GreenWattWise Lab Complete Guide
- A printable installer-quote checklist
Who it's for
- Homeowners who already have one or more installer quotes in hand
- Anyone comparing proposals that quote capacity, warranty, or backup differently
- Buyers who want a repeatable process, not a one-off gut check
What this toolkit does not do
- A recommendation for a specific installer or battery brand
- Electrical design, permitting, or installation instructions
- A guaranteed savings or payback figure for your home
GreenWattWise Lab doesn't install batteries, manufacture them, or earn anything from steering you toward a larger system — see the About page for more on that.
How to use it
1. Confirm your target size first
Work through the sizing guide (or the free calculator) before evaluating any quote — you need a target to compare a quote against, not just the quote's own numbers.
2. Compare quotes on the same terms
Use the included checklist to record each installer's capacity, power rating, backup scope, and warranty using the same categories — not each installer's own framing.
3. Test the sizing rationale
Use the Decision Calculator to check whether the specific size you were quoted actually fits your own consumption and solar profile.
4. Decide with the full picture
Bring sizing, specifications, warranty, and price together before accepting — the Toolkit is built so none of those get compared in isolation.
Get the Buyer Toolkit
Evaluate your next quote with a consistent process instead of a gut check.
Related resources
Confirm your target size first.
The free version of the questions this toolkit helps you apply.
A quick starting estimate.