How do I create a rest usage formula meter to find unmeasured consumption?

A rest usage formula meter calculates the difference between a main (total) meter and its sub-meters. This reveals how much consumption is unaccounted for — often common areas, system losses, or meters not yet connected.

Step by step

1. Go to Analytics → Formula Meters
2. Click "Create Rest Usage" (quick action) or "Create Formula Meter" and select type "Rest Usage"
3. Name: Give it a descriptive name (e.g., "Building A — Unmeasured Electricity")
4. Building: Select the building
5. Main Meter: Select the building's main meter (the total consumption meter)
6. Child Meters: Select all sub-meters that should be subtracted from the main meter
7. Unit: Must match the main meter's unit (e.g., kWh)
8. Click Save

The calculation

Rest Usage = Main Meter consumption - (Child 1 + Child 2 + ... + Child N)

Example

Main electricity meter: 5000 kWh/month
Tenant A: 1500 kWh, Tenant B: 1200 kWh, Common area: 800 kWh
Rest Usage = 5000 - (1500 + 1200 + 800) = 1500 kWh unmeasured

What the result tells you

• Positive value — Consumption exists that no sub-meter tracks (common areas, losses, unauthorized usage)
• Zero or near-zero — Your sub-meters account for all consumption
• Negative value — Sub-meters total exceeds the main meter, suggesting a configuration error (overlapping meters or wrong main meter selected)

Troubleshooting negative rest usage

• Check that source meters do not overlap in their measurement scope
• Verify the main meter is truly the building-level total meter
• Check that source meter units match (all kWh, not mixing kWh and MWh)

Where to calculate: After creating, click the formula meter → "Calculate" to compute values for a specific time period and resolution (hour, day, week, month).