How to bill VRV/VRF air-conditioning fairly

Tariffs & billing · 7 min read · Updated 2026-04-04
TL;DR

VRV/VRF billing is done either by main-meter + indoor-unit runtime weighting, or by zone-level energy metering of the ODU + indoor-unit proportionality. Encharge + EnPro support both methods with BMS / gateway integration.

Why VRV/VRF billing is hard

A VRV (Variable Refrigerant Volume) or VRF (Variable Refrigerant Flow) system uses one outdoor unit (ODU) to serve 10–30 indoor units across different rooms. The total power is drawn at the ODU — so there's no direct per-room electricity reading.

Without a fair attribution method, some tenants end up paying for others' AC. This is one of the biggest complaint sources in premium PGs and boutique hotels.

Two proven VRV/VRF billing methods

Method A — Runtime + capacity weighting: each indoor unit reports runtime and set-point via the VRF controller. Total ODU kWh is split proportionally to (runtime × rated capacity) per zone. Works with Daikin, Mitsubishi, LG, Toshiba VRFs.

Method B — Direct zone metering: for larger systems, individual indoor unit panels are CT-metered directly. More hardware, more accuracy.

Frequently asked questions

Can a prepaid meter be used with VRV/VRF?

Yes — the prepaid meter sits on the room's final circuit. For VRF, we combine the prepaid meter with a VRF-controller integration to attribute ODU energy per room.

Do I need BMS integration for VRF billing?

Only if you use Method A (runtime weighting). Method B (direct metering) is standalone. Most PGs and small hotels pick Method A for lower cost.

Related from Enlog

Encharge for PG/hotel billingEnPro three-phase smart meter

More from Enlog Learn

Prepaid electricity meter
A prepaid electricity meter lets tenants, PGs and co-living owners pay for power upfront — like a mobile recharge. Here's how it works, who needs it, and how to choose one.
Reduce PG electricity bill
PG electricity bills can eat 20–30% of revenue. Learn the exact playbook PG owners use to cut bills and recover 100% cost from tenants — fairly and automatically.
Smart vs traditional meter
Smart meters read, report and control electricity consumption remotely. Traditional meters only spin. Here's the full comparison for PG owners, offices and homes.
How to do energy audit
An energy audit maps every kWh your building consumes. Learn the 7-step professional audit process used for hotels, malls, offices, hospitals and factories in India.
Common area billing PG
Corridors, lifts, pumps, gyms — who pays? Learn the fair, transparent way PGs split common-area electricity bills among tenants using room-wise prepaid meters.
3-phase vs 1-phase billing
Most PG rooms are single-phase, but heavy common loads and VRF are three-phase. Here's how to meter and bill both correctly — kWh, kVAh and power factor.