Does the Monitoring Match the Modeling?
Over the last couple of weeks, I’ve been diving deep into AlsoEnergy’s documentation and auditing the expected output of our systems against the PVSyst models we generated that proved they’re financially viable assets. My findings so far have shown significant inconsistencies in the way that sites have been set up (not Also’s fault; we’ve handled this internally) compared to the models, which has created no small source of frustration and confusion for our Asset Management, Engineering, and Financial departments. A quick breakdown: - The PVSyst model uses data from product manufacturers (solar modules, inverters, etc) along with historical weather data and shading maps to provide a reasonably accurate projection for how a system will perform. - AlsoEnergy sites get set up by adding in the same equipment, along with the weather sensors installed at site, and it creates estimates in real time based on weather data and equipment specs. - AlsoEnergy has several different options for modeling systems, each requiring different information to be accurate, or substituting various assumptions. Essentially, this seems like double work, attempting to recreate the same model that the system was built on, using a different platform, to act as the baseline from which the Weather-Adjusted estimates are generated. But there’s an important distinction: the PVSyst model is also a Weather Adjusted, but again, it uses historical weather data instead of momentary / current data. Where the Disconnect Happens: This is where many portfolios run into trouble. PVSyst is static—it captures design intent at a single point in time. AlsoEnergy (and other monitoring platforms) are dynamic—they reflect as-built reality and constantly changing site conditions. If the digital twin inside the monitoring platform doesn’t perfectly mirror the configuration and assumptions in PVSyst—things like stringing, inverter clipping limits, module binning, soiling losses, or albedo—it can lead to two parallel truths about performance that never fully align.