Homer Pro 3.15 -

Version 3.15 offers granular control over "Operating Reserves." This is the software's way of asking: "How safe do you want to be?"

The Deep Dive: By default, HOMER sets operating reserves (spinning reserve) based on a percentage of load. This ensures that if a cloud passes over the solar panels, the generator can pick up the slack instantly.

Homer Pro 3.15 now supports battery–hydrogen hybrid storage for long‑duration backup — but only in the Energy Storage extension module. It’s still rare, but it shows where microgrids are heading in 2026 and beyond. homer pro 3.15

Would you like a short cheat sheet of keyboard shortcuts or a sample .homer project file walkthrough for 3.15?

Homer Pro 3.15 is the latest iteration of the industry-standard microgrid modeling tool from UL Solutions. Whether you're sizing a solar+storage system for an island village or optimizing backup power for a remote telecom tower, this release adds precision, speed, and better economics handling. Version 3

Goal: Reduce diesel consumption 70% with PV + storage

| Problem | Solution | |---------|----------| | “Unmet load” error in optimal case | Increase min renewable fraction or add storage | | Battery cycles too high | Lower max charge current or change dispatch to load following | | Converter oversized | Check peak simultaneous charge+discharge — rarely happens | | Diesel runs even with full battery | Adjust “setpoint state of charge” (default 80% → 95%) | Would you like a short cheat sheet of

HOMER Pro 3.15 has introduced significant improvements in how it models battery degradation and kinetics. The old "Kinetic Battery Model" (KiBaM) is still there, but the software now allows for more nuanced definition of Lithium-Ion chemistries.

The Deep Dive: In legacy versions, batteries were often modeled with a fixed lifetime throughput (kWh throughput before failure). This is a linear approximation of a non-linear reality.