How Wevolt Load Management Works (Frequency, Control Loop & Failsafes)

Overview

Wevolt’s Load Management System (LMS) uses a near real-time feedback loop between the site meter, backend, and chargers to dynamically manage available electrical capacity.

This ensures EV charging is optimised without exceeding site limits, even as site load changes.

How often is site load measured?

At sites with dynamic load management (e.g. Modele with a Shelly whole-of-site meter), the meter provides updates:

• Every ~2 seconds, or
• Immediately when a significant load change occurs

This allows the LMS to maintain an up-to-date view of total site load, including:

• EV chargers
• Building consumption

How load decisions are made

Each meter update is processed in real-time to calculate:

Available Capacity = Site Limit – Current Total Load

The LMS then distributes available current across all active chargers.

Stability buffer

A buffer is applied to:

• Prevent constant micro-adjustments
• Avoid reacting to minor fluctuations
• Ensure smooth and stable charging behaviour

Charger control loop (how chargers are adjusted)

When vehicles are charging, the LMS controls output using dynamic charging profiles:

• Each charging profile lasts 10 seconds
• The system ensures a new profile is sent before expiry

Update behaviour

• If load changes materially: A new profile is sent immediately.
• If load is stable: Profile is refreshed before expiry (every ~10 seconds).

This creates a system that is:

• Responsive to real changes
• Stable under normal conditions
• Efficient (avoids excessive communication)

What happens if communication drops?

Each charger has a built-in failsafe default profile:

• Typically set to a safe minimum (e.g. 6A for AC chargers)
• Configurable per site

If LMS communication is lost:

• Chargers automatically revert to this default
• Charging continues safely
• Site limits are never exceeded

Why this works at scale

The system is designed to handle both small and large sites effectively:

• High-frequency data (~2 seconds) — Near real-time visibility
• Event-driven updates — Immediate response to meaningful changes
• 10-second control loop — Stability without chatter
• Buffering — Eliminates noise-driven adjustments
• Failsafe profiles — Guarantees safety even during outages

Summary

In practice:

• Site load is monitored in near real-time (~2 seconds / on change)
• Load availability is continuously recalculated
• Chargers are adjusted dynamically (up to every 10 seconds or sooner)
• A buffer prevents unnecessary fluctuations
• A default profile ensures safe operation if communication is lost

Result: The site always stays within electrical limits while maximising charging performance.

Related context

This article addresses common questions about how frequently load data is read and how quickly the system responds, particularly for sites using dynamic metering such as Shelly devices.