PVAlign Simulator Update History
Browse the chronological PVAlign simulator changelog, including new components, calculation improvements, safety feedback, controls, and learning features.
Product changelog / 2026
Browse 26 recorded, user-visible improvements across 13 release dates. The history covers new electrical components, calculation improvements, safety feedback, controls, and learning features.
Automatic Source Transfer
Realistic Break-Before-Make ATS Behavior
The Automatic Transfer Switch now qualifies normal and emergency AC sources, observes editable transfer, return, and open-transition delays, and prevents the two sources from being paralleled.
Personal Canvas Preferences
Choose Your Minimum and Maximum Zoom
Users can set and save canvas zoom limits from 10% to 500%. The selected limits apply to the mouse wheel, touch gestures, minimap controls, and circuit recentering.
Safety Guidance
Persistent Simulator Scope Notice
A configurable scope notice now keeps the simulator's educational and preliminary-planning limitations visible, with the user's preference saved between sessions.
Automatic Source Transfer
ATS Node, Inspector, and Simulation Introduced
PVAlign gained its first two-source ATS node with automatic and manual operation, source monitoring, editable ratings and delays, inspector controls, and load-side switching.
Safety Visualization
Optional Safety Icons on the Canvas
Users can enable visual safety-state icons from Settings to identify supported warnings and unsafe operating conditions directly on simulator nodes.
Solar Panel Modeling
More Accurate and Customizable Panel Configurations
Solar panel configuration data and editing behavior were refined to improve model accuracy and make custom module setups easier to represent.
Current Visualization
Animated Current Flow
An optional current-flow animation was added to connected wires, with a persistent Settings control so users can choose between a static or animated canvas.
Battery Calculations
Battery Power and Current Limits Corrected
Battery bus power calculations and current-limit handling were corrected to improve how available battery power is distributed and reported.
Inspector Workspace
Collapsible Desktop Inspector
The component inspector can now collapse on desktop, leaving more room for circuit wiring while retaining quick access to the selected node's controls.
Simulator Alerts
Unified Safety and Operating Alerts
Separate warning banners were consolidated into one prioritized simulator alert so the most important supported condition is easier to find and dismiss.
Battery and Controller Settings
Expanded Discharge and Power Controls
Battery discharge current, internal resistance, minimum state of charge, controller output checks, and automatic panel Pmax calculation gained more detailed controls.
Learning Experience
Step-by-Step Video Guide
The homepage gained short simulator clips for clearing, placing, wiring, editing, copying, branching, loading presets, and changing environmental conditions.
PV Combiner Redesign
A Clearer, Resizable Combiner Box
The PV combiner uses a hardware-style SVG, keeps the same appearance as string inputs are added, and supports adjustable width and height without changing its default size.
Protection State Feedback
Live Fuse Heating and Trip Timers
PV combiner and MC4 fuses report Normal, Heating, Melting, and Open states, show a larger temporary countdown before opening, and warn when continuous current exceeds the selected rating.
Expanded Protection Wiring
Breakers and MC4 Fuses Work Together
Power breakers can connect to PV combiner inputs, and MC4 fuse connectors can feed breakers, making it easier to build realistic protected PV wiring paths.
Persistent Preferences
Save Simulator Settings in the Browser
Simulator display and interaction preferences can be saved to browser storage and restored when the user returns.
PV Protection
MC4 Fuse and PV Combiner Nodes Introduced
PVAlign added compact MC4 fuse connectors and a multi-string PV combiner with independent fuse states, current accumulation, voltage checks, and supported breaker connections.
Breaker Protection
Timed Overload Curves for Power Breakers
Power breakers gained persistent inverse-time overload behavior alongside instantaneous short-circuit protection, making delayed trips visible during simulation.
Electrical Measurement
Expanded Battery Multimeter Readings
Multimeter output now includes battery-bank capacity and stored-energy information in addition to supported voltage and current measurements.
Workspace Controls
Instructions Modal and Redo Shortcut
A simulator instructions panel was added to the menu, and Ctrl+Y became available as a redo shortcut alongside the existing editing controls.
Hybrid Inverter Control
State-of-Charge Source Transfer
Hybrid inverter settings gained battery state-of-charge thresholds for transferring supported loads between battery-backed operation and the utility source.
Control Hardware
SPDT Relay and DC Contactor Nodes
PVAlign added isolated relay-coil switching and a high-current DC contactor with pickup and dropout behavior, contact limits, inspector controls, and wire-physics support.
AC System Modeling
Configurable AC Frequency
Grid and hybrid-inverter frequency settings were expanded, allowing frequency compatibility to influence supported motors and AC loads.
Household Loads
Specific Appliance Nodes
Rice cooker, washing machine, television, electric kettle, and other configurable appliance models expanded the available household load library.
Battery Protection
Low Voltage Disconnect Node
A configurable LVD node introduced battery-voltage thresholds, hysteresis, delay estimates, current limits, and supported protection states for DC circuits.
Battery Inverter
Sizing and Terminal Controls
The battery inverter gained expanded sizing, current-limit, surge, efficiency, voltage-window, frequency, standby-power, and terminal controls.