Independent analysis | Transparent assumptions | Real decision tools

Make the expensive energy decision with the real numbers first.

Wattfull helps you evaluate EV ownership, solar payback, charging economics, batteries, and gear with source-backed data, practical cost logic, and verdicts that explain what actually matters.

Preview: EV vs gas
A quick local snapshot before the full calculator
US avg
Model Y vs RAV4 | 12k mi/yrEVGas
Fuel per year$538$1,360
Maintenance per year$600$1,100
Snapshot result
Estimated annual savings
+$1,322
5-year savings
+$6,610
Break-even
~5.6 yrs
Updated context16 cents/kWh$3.40/gal
Why this feels different
Clear assumptions, source-backed numbers, practical verdicts
See methodology
Electricity
EIA rates
Live when available, fallback when not
Vehicles
EPA efficiency
Per-mile math stays transparent
Methodology
Open formulas
Every major assumption is visible
Positioning
Independent analysis
Built to explain tradeoffs, not hide them
50
states covered
33K+
ZIP contexts
7K+
rate records
8
core tools
START HERE

Pick the decision path that matches what you are actually trying to decide

The point is not to open every tool. The point is to start with the one that answers your real question first.

Best first tool
Should I buy an EV?
Run the flagship calculator with local rates, driving mix, incentives, and a plain-language verdict.
Operating or buying view
Best if you know your ZIP and annual miles.
Open this path
Homeowner path
Is solar worth it here?
Estimate payback, 25-year savings, and incentive effects without pretending every roof is identical.
Payback and lifetime savings
Best if you know monthly kWh and roof constraints.
Open this path
Decision support
Which option is smarter overall?
Use the compare flow when you need purchase price, annual cost, and long-term ownership separated cleanly.
Purchase vs operating cost
Best if you are actively comparing two vehicles or setups.
Open this path
TOOLS

The core Wattfull toolkit

These are the tools that do the real work: calculators, comparison flows, and regional context built to answer practical purchase questions.

Most-used: EV CalculatorBest for homeowners: Solar ROIBest for tradeoffs: Compare
Featured Tool
EV Calculator
ZIP-based electricity rates, EPA vehicle efficiency, climate zones, and state incentives. Every assumption shown and editable.
ZIP-based ratesClimate adjustedState incentives5-year projection
Start with EV savings
Solar ROI
Roof, production, incentives, and payback logic in one flow.
Open
Home Charging
Level 1 vs Level 2 economics, install assumptions, and charger fit.
Open
Battery Preview
Backup runtime, TOU value, and resilience-first battery economics.
Open
Compare
Separate purchase cost, operating cost, and total ownership cost.
Open
State Grades
50 states ranked by incentives, economics, and grid context.
Open
What Can I Run?
Match appliances to a power station with realistic runtime context.
Open
Carbon Impact
Visualize lifetime emissions savings for your vehicle and region.
Open
Gear Reviews
Review chargers, solar gear, and backup products without the spam.
Open
Referrals
Community-curated referral links that go through approval first.
Open
HOW IT WORKS

Problem, inputs, numbers, explanation, recommendation

Wattfull should feel more like a decision engine than a content site. This is the structure behind the better tools.

01
Start with your location and use case
ZIP code, annual miles, charging mix, and ownership horizon define the economic context before any verdict is shown.
02
Run the actual cost math
Wattfull separates purchase cost, operating cost, and total ownership cost instead of collapsing everything into one headline number.
03
Show the assumptions clearly
Rates, efficiency, climate adjustments, and incentives are shown so you can see what is driving the result.
04
Point to the next best action
Every tool should leave you with a verdict, caveats, and a sensible next step instead of a dead end.
COMMON USE CASES

Where the platform is most useful

The strongest use cases are the ones where assumptions change the answer. That is where transparent math matters the most.

Charging practicality
Apartment driver deciding if EV ownership still works
Public charging changes the math fast. Wattfull keeps charging mix explicit so the verdict stays honest.
Explore this use case
Ownership decision
Cold-climate buyer comparing two vehicles before purchasing
Purchase price, climate penalties, and annual mileage can reverse the result. The compare flow shows where that happens.
Explore this use case
Home energy economics
Homeowner checking if solar payback is real or wishful
Solar is strongest when incentives, roof use, and utility economics line up. This is where ROI framing matters more than installer hype.
Explore this use case
Regional context
State-to-state economics shift that changes the answer
The exact same car can be a smart buy in one state and marginal in another. Rates, fuel prices, and incentives move the verdict.
Explore this use case
WHY TRUST WATTFULL

Calm, source-aware, and built to explain the answer

The goal is not to overwhelm you with dashboards. The goal is to make the recommendation legible and defensible.

Built to answer expensive questions
The platform is designed around purchases and operating decisions that actually matter: EVs, solar, charging, batteries, and equipment.
Transparent by default
It is obvious where the estimate comes from, what is live vs fallback, and which assumptions could change the answer.
Practical, not generic
The goal is not content volume or generic AI chatter. The goal is to help you choose with more confidence and less noise.
Founder note
Most calculators hide the assumptions that actually decide the outcome.
Whether an EV or solar setup makes sense depends on local rates, annual usage, incentives, and ownership horizon. Wattfull is built to make those drivers visible instead of burying them behind a generic average.
Open dataTransparent mathIndependent positioning
Next move
Do not leave the homepage with a vague idea. Start with one grounded answer.
If you know your ZIP and annual miles, the EV calculator is the best first click. If you own your home, solar ROI is usually the second-best path. If the decision is already between two options, go straight to Compare.
Best first click
EV Calculator if you know your ZIP and miles.
Best second step
Compare if purchase price or ownership horizon matters.
Best homeowner path
Solar ROI when utility bills are part of the question.
PROFILE

Save once, pre-fill everywhere

Store your ZIP, annual miles, and driving context so the calculators stop starting from scratch.