Living area remains light filled even on cloudy days in June

June comfort and cost report

Cold, cloudy days in June were a good test of the energy cost for active heating to remain comfortable indoors. The total energy bill to live comfortably in our high-efficiency, all-electric home was a reasonable $2.50 per day.

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Passive heating example from May data

May comfort and cost report

During May, the colder, cloudier days meant the house changed from passive to active heating mode. The air conditioner was handy to keep the indoor temperature within the target comfort range. Less solar power production and higher electricity consumption left us with a $43 energy bill.

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Late April sunshine warming the concrete slab in the main bedroom

April comfort and cost report

April marks the end of a long run of days of excess solar power exports and passive cooling. Shorter, cloudier days reduce power production. Colder temperatures mean the house has moved to passive heating, with just a touch of active heating using the air conditioner. It's still comfortable indoors but the monthly energy cost is expected to rise from here.

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Outdoor temperatures quickly changing from cold to hot in November didn't significantly affect indoors

November cost and comfort report

Despite Melbourne's temperatures swinging from Summer to Winter and back again, the house maintained a comfortable indoor temperature with minimal use of mechanical heating.

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October comfort and cost report

Longer, warmer days reduced the need for any form of heating to keep indoors at a comfortable temperature. The extra sunshine increased solar power production so we had more than enough electricity for household demand and charging EVs.

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Miglas Windows image of curved window wall for August report

August comfort and cost report

In August, our high performance home maintained a comfortable indoor temperature within the target range of 18 to 21oC. The month’s energy bill was $47 or approximately $1.50 per day, ...

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North facing living area windows for July report

July comfort and cost report

Analysing the temperature monitoring and electricity consumption data for July is an opportunity to review the comfort and cost of living in a passive solar, all-electric home.

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Sunlight coming through the northern windows and hitting the thermal mass.

Winter sunshine benefits

A few cold, but sunny, days allowed our home to show off what it can do with sunlight. Light streaming through the large north facing windows quickly warmed the house in daytime. Solar panels produced more than enough electricity to supply our all-electric home's needs.

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Winter solar operation of solar power and battery

Import power test run

A run of cold, cloudy days was the ideal opportunity to program the SolarEdge inverter to import offpeak power to charge the battery at night. Without this option, I would have paid peak power rates for electricity the next day when solar production wasn't able to meet household demand.

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Thermal mass in living room heated by sunlight

Living with thermal mass

Learning how to help the passive solar design features keep us warm in Winter is a useful exercise. Sunlight is all we need on clear, cold days. When it's cloudy, we use the heat pump to stop the concrete slab thermal mass cooling too much.

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