📢 What’s new

New features

MV/HV Separation for AC Losses

PVcase Yield now supports separate modeling of Medium Voltage (MV) and High Voltage (HV) loss stages — a critical capability for utility-scale PV projects where MV collection networks and HV transmission paths have materially different loss characteristics.

Previously, all post-inverter AC losses were treated as a single aggregated value. With this release, the AC loss chain is decomposed into distinct, independently configurable stages that reflect your plant's physical topology.

What changed:

Layouts & electrical page

A new Transformers column has been added alongside Layouts, Modules, and Inverters. You can now define MV and HV transformers independently.

Both MV and HV transformers are optional — you can include one, both, or neither depending on your project's topology. 

Losses page

The losses configuration has been updated to reflect the new voltage-level separation:

• The former AC cabling loss has been renamed to LV cabling loss.
• New loss categories have been added: MV transformer loss, MV cabling loss, HV transformer loss, and HV cabling loss.
• A new Inverter night consumption loss replaces the former inverter self-consumption loss with an updated methodology.
• The Loss impact preview graph recalculates with the new MV/HV loss values.

Each of these can be enabled or disabled independently.

Results page

• The Detailed Results view now shows individual line items for each voltage-level loss stage (LV cabling, MV transformer, MV cabling, HV transformer, HV cabling).
• The losses modal on the Results page indicates when LV, MV, or HV values were not applicable and therefore excluded from the calculation.
• Transformer inputs are displayed in a preview modal accessible from the Results page.

PDF report & CSV/XLSX export

Both the PDF report and the detailed CSV/XLSX export now reflect the full MV/HV loss breakdown, with individual line items for each voltage-level stage. The report also notes when specific losses were not applicable to the simulation.

Compatibility checks

The system now validates compatibility between the inverter, MV transformer, and HV transformer to ensure consistent voltage configurations across the electrical chain.

Migration note

Your previous AC cabling loss values are preserved as LV cabling losses. Transformer settings are new and will need to be configured for projects that require MV/HV separation. 

Improvements

Updated Performance Ratio calculation

We have enhanced the Performance Ratio (PR) calculation for bifacial PV systems to improve accuracy. The revised methodology now considers net rear irradiance in the PR denominator, which accounts for ground shading effects caused by the array itself. Previously, the PR calculation used the full, unshaded rear irradiance, with shading losses (caused by module rows behind adjacent rows) only reflected as energy flow reductions, resulting in a larger denominator and lower PR values.

With this update, the back irradiance component (G_POA, back) used in the PR denominator incorporates horizon, terrain, and near shading losses, offering a more precise measure of the effective irradiance reaching the rear of the modules. For detailed information on the updated calculation, including treatment of front and back irradiance components in the PR formula, refer to the Performance Ratio section of the Yield documentation.

What to Expect:

• Bifacial projects will now display higher DC and AC Performance Ratio values compared to previous calculations.
• Monofacial projects remain unaffected.
• Energy production metrics (kWh, MWh) are unchanged; only the PR calculation has been updated.
• Existing simulation results are not migrated; the new PR metrics will apply to simulations starting May 7, 2026.

Multi-Language PDF Reports

PDF reports can now be exported in five languages: English (US), Italian, French, German, and Spanish. A new language selector dropdown appears next to the Report Presets button in the PDF export modal — simply choose your preferred language before exporting, and the entire report content will be generated in that language.

We believe these improvements will greatly enhance your simulation experience and offer more comprehensive options for modeling and analysis.