Home Monthly kWh Consumption

Household electricity consumption (kWh/month)

For each appliance, the monthly consumption works out to kWh = (watts × hours_per_day × days) / 1000, and what you pay is kWh × tariff. A four-person household in Brazil averages 150-200 kWh/month. Where does it go? The refrigerator eats about 30 kWh, the electric shower (5.5 kW, 15 min/day × 30 days) ~40 kWh, a 9,000 BTU air-conditioner run an hour a day around 30 kWh, LED lighting 5-10 kWh and the washing machine roughly 10 kWh. To see the math in action: a 1,500 W appliance running 4 h/day for 30 days = (1500 × 4 × 30)/1000 = 180 kWh, which at R$0.75/kWh comes to R$135. The ANEEL tariff flags (green/yellow/red) tack on a surcharge during dry seasons.

Applications

Trim the electricity bill, weigh keeping an old appliance against an inverter or LED replacement, size up rooftop solar PV, make sense of a Procel label, run an ISO 50001 audit, or just put together a household energy budget.

FAQ

Why is the electric shower the biggest villain? It pulls a lot of power (4-7 kW) and you use it in short bursts every day. For most Brazilian homes, swapping it for solar thermal or a gas heater is the one change that moves the needle the most.

Does standby consume? It does. TVs, set-top boxes and chargers sitting idle can add up to 5-15 kWh/month between them, and a power strip with a switch takes care of it.

How much do tariff flags add? During scarce-water periods the red flag level 2 puts roughly R$0.10/kWh on top of the base tariff, so a 200 kWh month ends up about R$20 pricier.