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Energy · head to head

Fronius SOLARWEB vs OSIsoft PI System

Fronius SOLARWEB logo

Fronius SOLARWEB

Energy

Solar inverter monitoring and analytics platform

From
Free
Rated
-
Full reviewWebsite
OSIsoft PI System logo

OSIsoft PI System

Energy

Real-time operational intelligence for industrial operations

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Fronius SOLARWEB has a free tier, so it costs nothing to try first.
  • Each has a real cost: Fronius SOLARWEB only works optimally with Fronius hardware; monitoring of third-party inverters is not supported; OSIsoft PI System oSIsoft is now AVEVA and osisoft.com redirects to the AVEVA PI System pages
  • They diverge on capability: Fronius SOLARWEB covers Real-time monitoring, OSIsoft PI System covers Real-time data collection.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Fronius SOLARWEB and OSIsoft PI System actually diverge.

Attributes where Fronius SOLARWEB and OSIsoft PI System differ
AttributeFronius SOLARWEBOSIsoft PI System
Starting priceFreeOn request
Pricing modelUnknownquote
Free tierYesNo
PlatformsWeb, iOS, AndroidWindows, Web, Api
Founded19451980

Identical on both: user rating (Not yet rated), category (Energy).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Fronius SOLARWEB

  • Real-time monitoring
  • Performance analytics
  • System optimization
  • Alert notifications
  • Mobile app
  • Cloud deployment
  • Web support
  • Mobile support

Only in OSIsoft PI System

  • Real-time data collection
  • Time-series data storage
  • Advanced analytics
  • Asset framework
  • Visualization tools
  • Event frames
  • Data compression
  • Notifications and alerts

Both cover

  • SSL encryption

What people use each for

The jobs each tool is most often brought in to do.

Fronius SOLARWEB

  • System monitoringnot OSIsoft PI System
  • Performance trackingnot OSIsoft PI System

OSIsoft PI System

  • Collecting and historising high frequency industrial process and sensor datanot Fronius SOLARWEB
  • Operations dashboards and trend analysis for plants and utilitiesnot Fronius SOLARWEB
  • Feeding real time operational data into analytics and digital twin applicationsnot Fronius SOLARWEB

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Fronius SOLARWEB

  • Only works optimally with Fronius hardware; monitoring of third-party inverters is not supported
  • Advanced historical analytics and forecasting features require paid premium subscription
  • Requires stable internet connectivity and cloud connection for all functionality
  • String-level diagnostics require onsite inspection to identify which panel within a string is failing

OSIsoft PI System

  • OSIsoft is now AVEVA and osisoft.com redirects to the AVEVA PI System pages
  • No pricing is published; osisoft.com/pricing resolves to AVEVA product pages with no rate, minimum or cost driver
  • Licensing runs through the AVEVA Flex Subscription Program rather than a published per-seat or per-tag price
  • The PI System is split across separately listed products including PI Server, PI Vision, PI Data Infrastructure and Edge Data Store

Pricing, plan by plan

Fronius SOLARWEB

Free
  • BasicFree
    • Real-time energy monitoring
    • Daily/monthly/yearly production charts
    • Battery storage monitoring

OSIsoft PI System

On request

No published plan breakdown. See the OSIsoft PI System review.

Which should you pick?

Choose Fronius SOLARWEB if

  • You need real-time monitoring.
  • You want to start without paying.
  • You work on Web, iOS, Android.
  • You also want performance analytics.
Fronius SOLARWEB review

Choose OSIsoft PI System if

  • You need real-time data collection.
  • You work on Windows, Web, Api.
  • You also want time-series data storage.
OSIsoft PI System review

Questions people ask

Is Fronius SOLARWEB or OSIsoft PI System better?
Neither clearly leads. Fronius SOLARWEB starts at Free and OSIsoft PI System at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fronius SOLARWEB or OSIsoft PI System?
Fronius SOLARWEB has a free tier; the other does not. Paid plans start at Free for Fronius SOLARWEB and On request for OSIsoft PI System.
Does Fronius SOLARWEB or OSIsoft PI System run on more platforms?
Fronius SOLARWEB runs on Web, iOS, Android. OSIsoft PI System runs on Windows, Web, Api.
Can I use Fronius SOLARWEB for free?
Yes. Fronius SOLARWEB has a free tier, so you can try it without paying. OSIsoft PI System starts at On request.
What is Fronius SOLARWEB best used for?
Fronius SOLARWEB is most often used for system monitoring, performance tracking. Of those, system monitoring and performance tracking are not what OSIsoft PI System is typically brought in for.
What can Fronius SOLARWEB do that OSIsoft PI System cannot?
Fronius SOLARWEB covers Real-time monitoring, Performance analytics, System optimization, Alert notifications. OSIsoft PI System covers Real-time data collection, Time-series data storage, Advanced analytics, Asset framework. Both handle SSL encryption.

Answered from the vendors’ own pages

Fronius SOLARWEB: Does Fronius Solar.web work offline?

No, Fronius Solar.web requires stable internet connectivity as it is a cloud-based monitoring platform.

Source
OSIsoft PI System: How much does the AVEVA PI System cost?

AVEVA PI System (formerly OSIsoft PI System) operates on a subscription-based commercial model with customized pricing. The company structures subscriptions to match specific use cases and business needs, requiring direct contact with account representatives.

Source
Fronius SOLARWEB: What is the cost of Fronius Solar.web?

The basic version is completely free for registered Fronius hardware users. A premium subscription is available for advanced analytics and forecasting features, though specific pricing is not disclosed on the website.

Source
OSIsoft PI System: What is AVEVA PI System's pricing model?

AVEVA offers subscription-based licensing for software components running on-premises or in the cloud. Subscriptions are customized per customer use case, and pricing is determined through consultation with local account representatives.

Source
Fronius SOLARWEB: What Fronius products work with Solar.web?

Solar.web monitors Fronius inverters, smart meters, battery storage systems, and EV charging products. Advanced features like energy optimization require compatible GEN24/Verto inverters.

Source
Fronius SOLARWEB: Does Fronius Solar.web have a mobile app?

Yes, Solar.web offers native iOS and Android mobile applications for real-time monitoring.

Source
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