Best solar design tools for independent installers
An installer’s needs differ from a homeowner’s. You need a repeatable design and proposal workflow, reliable inputs and a clear handoff to the work your business is responsible for. A friendly planning conversation can support that process, but it does not replace professional design software.
| Tool | Best fit in this guide | Access and tradeoffs |
|---|---|---|
| OpenSolar | Best fit among these tools for professional system design and customer proposals. | Core platform advertised as free; external API access and connectors can have charges. |
| PVWatts | Useful for a documented production-model cross-check. | Public web calculator; API use has separate key and usage requirements. |
| CleanFuture (ours) | Potentially useful as the homeowner’s brief and question record. | Account required to save; saved AI estimates currently require an active subscription. |
What matters for independent installers
A complete work product
Evaluate how the software handles your design and proposal process using a representative project. Confirm the documents and verification steps your own workflow still requires.
Data access and commercial terms
Separate core software pricing from integrations and external access. Free core functionality does not guarantee that every business connection has no cost.
Accountability for inputs
Record who supplied usage, geometry and tariff assumptions. A polished proposal is easier to trust when you can trace those inputs and identify what remains provisional.
OpenSolar
- Category
- Professional solar design and sales software
- Best for
- Best fit among these tools for professional system design and customer proposals.
- Access
- Core platform advertised as free; external API access and connectors can have charges.
OpenSolar provides professional design and proposal workflows, including 2D, 3D and manual design options described in its documentation.
What to weigh before choosing
Check local imagery, your required deliverables and the terms for external API access or connectors.
Imagery and design modes vary by location. A software layout is not a substitute for site verification or professional responsibility.
PVWatts
- Category
- Public photovoltaic production model
- Best for
- Useful for a documented production-model cross-check.
- Access
- Public web calculator; API use has separate key and usage requirements.
PVWatts models grid-connected photovoltaic output using inputs such as capacity, tilt, azimuth and losses. Its V8 API documents monthly and hourly output options.
What to weigh before choosing
It is not a complete sales, project or proposal system.
A modeled production result does not verify usable roof area, structural condition, electrical design or a household’s bill savings.
CleanFuture (ours)
- Category
- Conversational household planning
- Best for
- Potentially useful as the homeowner’s brief and question record.
- Access
- Account required to save; saved AI estimates currently require an active subscription.
Discuss your energy plan in Chat, explore supporting Map and Data pages, and keep preliminary estimate versions inside My system. You can explicitly publish a limited read-only snapshot.
What to weigh before choosing
It does not provide a professional design suite or a guaranteed import path into your existing software.
Not installer bidding, professional roof design or a guaranteed savings calculation. A regional solar estimate excludes battery costs and detailed tariff modeling.
A practical next-step checklist
- List the deliverables and handoffs your installation business actually needs.
- Test a representative project in the professional platform using known inputs.
- Check integration, export and paid-access requirements before committing the workflow.
- Keep homeowner assumptions separate from measurements and professional design decisions.
A situation to watch for
If your business needs an external system to read project data automatically, assess that access explicitly. A free design account alone does not establish the permissions, compatibility or price of the integration.
This checklist is our planning advice, not a claim that any listed tool automatically performs every step.
Questions worth asking
Should installers choose CleanFuture instead of OpenSolar?
Not for professional design and proposals. OpenSolar is the relevant choice between the two for that task. This is a scoped selection, not an exhaustive review of professional design vendors.
Does OpenSolar’s free core include free API access?
Its official announcement distinguishes the free platform from paid external access. Confirm the applicable plan and connector terms for your use case.
Turn the reading into a plan
Bring your questions to Chat and keep the assumptions tied to your system.
Discuss my plan in ChatYour question and this article’s context will be prefilled for you to review and send. Account required to save a system; saved AI estimates currently require an active subscription. Preliminary guidance, not an installation quote.
Sources and review method
We make CleanFuture. These are our editorial recommendations based on first-party documentation and our own product’s scope, not hands-on performance tests. We recommend other products when they fit the job better. US-focused; local availability and terms need checking.
We selected five overlapping solar workflows: quote comparison, installer research, advisor-led buying, production modeling and professional design. PVWatts and OpenSolar are adjacent tools, not equivalent homeowner services. This is a focused shortlist, not an exhaustive market survey or an objective top-five company ranking.
Recommendations weigh the task, required inputs, output, access terms and limitations. We did not test purchases, installation quality, model accuracy or response times. Product descriptions come from the linked official documentation; workflow advice and rankings by fit are our editorial judgment. We do not use numeric ratings or vendor savings claims to choose winners.
For broader whole-home electrification, also consider QuitCarbon’s planning and coaching. Solar.com is another shopping service outside this five-tool selection. Exclusion is not a negative evaluation.
Sources: OpenSolar: professional platform; OpenSolar: first project design guide; OpenSolar: free platform and paid external access; PVWatts: public calculator; PVWatts V8: official model inputs and outputs; CleanFuture: solar estimate workflow.
Capabilities and terms can change. Check the provider’s current documentation and your actual proposal before committing.