Solar calculators are useful when they make assumptions visible. They are less useful when they hide roof conditions, electricity tariffs, incentives, battery use, financing, and future household changes behind one confident number.
This hub collects worksheet-style tools for residential solar decisions. Use them before requesting quotes, while comparing proposals, or after an installer gives you a system design.
Cost and savings tools
Solar Panel Cost Calculator helps turn an installed price, system size, incentive estimate, and financing assumption into comparable cost figures. It is most useful when you have at least one real quote or a clear target system size.
Solar Payback Calculator shows how payback depends on system cost, annual bill savings, export value, maintenance, financing, and future electricity-price assumptions.
Use these together. Cost without savings is incomplete. Savings without cost can make a weak project look stronger than it is.
Battery sizing tool
Solar Battery Size Calculator helps estimate usable storage needs for bill savings, load shifting, and backup planning.
Battery sizing should start with loads and goals, not product marketing. A battery used for evening self-consumption is different from a battery intended to run critical loads during an outage.
Checklists before quotes and installation
Roof Solar Suitability Checklist covers the property conditions that can affect system design: roof age, structure, orientation, shade, access, electrical space, weather exposure, and local approval requirements.
Solar Quote Comparison Checklist helps separate a complete proposal from a vague price. It covers equipment, capacity, production, exclusions, incentives, warranties, export rules, financing, and transfer terms.
What these tools cannot decide
No calculator can replace a proper site assessment, structural review, electrical design, utility approval, or country-specific incentive check. Local rules matter. Equipment compatibility matters. A household's electricity use can change.
Treat each result as a planning range. The goal is not perfect prediction. The goal is to ask sharper questions and compare every proposal on the same basis.
Recommended order
- Start with the roof checklist.
- Read the relevant country hub if the project is in the US, Australia, or the UK.
- Estimate cost and payback using conservative assumptions.
- Size battery storage only after the solar and tariff scenario is clear.
- Use the quote checklist before signing.
This order keeps the tools grounded in the actual property, the actual market, and the actual proposal.
