PVWatts alternatives
Most reasons to seek a PVWatts alternative are actually requests for a wider workflow: roof layout, proposal preparation, or help deciding what inputs to use. If you already need only a production model, a broader app can add effort without improving the answer.
| Tool | Best fit in this guide | Access and tradeoffs |
|---|---|---|
| OpenSolar | Consider OpenSolar for a professional design and proposal workflow around the production calculation. Confirm site imagery and detailed inputs. | Core platform advertised as free; external API access and connectors can have charges. |
| CleanFuture (ours) | Consider CleanFuture for a guided conversation about household requirements. It does not claim to replace PVWatts as a validated numerical benchmark. | Account required to save; saved AI estimates currently require an active subscription. |
| EnergySage | Consider EnergySage when the next missing evidence is an installer proposal rather than another modeled yield. | Free for shoppers; participating providers support the marketplace. |
What you are replacing
PVWatts models grid-connected photovoltaic output using inputs such as capacity, tilt, azimuth and losses. Its V8 API documents monthly and hourly output options.
A modeled production result does not verify usable roof area, structural condition, electrical design or a household’s bill savings.
OpenSolar
- Category
- Professional solar design and sales software
- Best for
- Consider OpenSolar for a professional design and proposal workflow around the production calculation. Confirm site imagery and detailed inputs.
- 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
Imagery and design modes vary by location. A software layout is not a substitute for site verification or professional responsibility.
CleanFuture (ours)
- Category
- Conversational household planning
- Best for
- Consider CleanFuture for a guided conversation about household requirements. It does not claim to replace PVWatts as a validated numerical benchmark.
- 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
Not installer bidding, professional roof design or a guaranteed savings calculation. A regional solar estimate excludes battery costs and detailed tariff modeling.
EnergySage
- Category
- Homeowner quote marketplace
- Best for
- Consider EnergySage when the next missing evidence is an installer proposal rather than another modeled yield.
- Access
- Free for shoppers; participating providers support the marketplace.
EnergySage organizes installer quotes and lets shoppers compare equipment, warranties and financing with advisor support.
What to weigh before choosing
A marketplace shortlist is not every installer in your area. Confirm local availability and the scope of each proposal.
Before changing tools
- Record the model version, location, capacity, geometry and loss assumptions.
- Ask whether the destination tool can represent the same assumptions. Treat unexposed defaults as uncertainty, not a match.
- Compare production in consistent units and periods. Do not compare one tool’s energy output directly with another tool’s dollar savings.
Moving your questions between tools is a manual handoff. This guide does not promise file compatibility, automatic imports or account cancellation.
Questions worth asking
Is CleanFuture a complete replacement for PVWatts?
CleanFuture brings planning questions, evidence and saved estimates together. That is useful context around a model, but this comparison does not claim its regional estimate runs on PVWatts or has equivalent accuracy. Compare model inputs before interpreting different outputs. Not installer bidding, professional roof design or a guaranteed savings calculation. A regional solar estimate excludes battery costs and detailed tariff modeling.
When should I keep using PVWatts?
Stay with PVWatts if you need transparent control over a focused production scenario. A Chat interface or a marketplace does not make the physical model more reliable simply by making its output easier to read.
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: PVWatts: public calculator; PVWatts V8: official model inputs and outputs; CleanFuture: solar estimate workflow; OpenSolar: professional platform; OpenSolar: first project design guide; OpenSolar: free platform and paid external access; EnergySage: marketplace process; EnergySage: getting and managing quotes; EnergySage: company and marketplace model.
Capabilities and terms can change. Check the provider’s current documentation and your actual proposal before committing.