How do I create a sum formula meter to combine multiple sub-meters?

A sum formula meter adds consumption from multiple physical meters into a single virtual total. Use it when no single physical meter measures the combined value you need.

Step by step

1. Go to Analytics → Formula Meters
2. Click "Create Sum" (quick action) or "Create Formula Meter" and select type "Sum"
3. Name: Give it a descriptive name (e.g., "Total Tenant Electricity")
4. Building: Select the building
5. Source Meters: Select two or more meters to add together (minimum 2 required)
6. Unit: Must match the source meters' unit (e.g., kWh)
7. Click Save

The calculation

Sum = Source Meter 1 + Source Meter 2 + ... + Source Meter N

Common use cases

• Total tenant electricity: Add all tenant sub-meters to get total tenant consumption without a dedicated physical meter
• Floor-level total: Combine all meters on a floor when there is no floor-level main meter
• Multi-feed totals: Some buildings have two utility feeds — sum them for the true building total

After creating

• Click the formula meter → "Calculate" to compute values for a time range
• Choose resolution: hourly, daily, weekly, or monthly
• Results are stored for fast retrieval
• Each calculation records the individual source meter values for audit

Weights

Each source meter has a weight multiplier (default 1.0). For a simple sum, leave all weights at 1.0. If you need a weighted sum (e.g., one meter counts at 50%), set that meter's weight to 0.5.

Where to manage: Analytics → Formula Meters → click your formula meter to view, edit, or recalculate.