EnergyNeutralHome.pdf

Smart grid interactive demand management where

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Smart-grid interactive demand management Where available, install: smart-grid technologies energy management systems and smart appliances. Store energy generated on site during off-peak periods for use or export during peak periods in hybrid electric vehicles or next generation batteries as they become more viable. Carbon zero, carbon positive
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452 Housing of the future Setting targets to become carbon zero As a first step, estimate your likely household energy requirements to help size and cost your renewable energy system. 1. Calculate current household energy consumption based on 12 months’ worth of energy bills or use a carbon calculator to establish a target to eliminate or offset. 2. Adjust the figures to reflect likely efficiencies in your new home or after renovations using the figures in the table above: minimise heating and cooling requirements by achieving the highest level of thermal performance possible — a NatHERS rating of your new home simulates typical heating and cooling needs for your climate in megajoules per square metre per year (MJ/m 2 /yr) minimise appliance energy use by installing the most efficient appliances and lighting during construction or at replacement. 3. Estimate your total energy needs and CO 2 emissions and decide how you will offset them. To be carbon zero, total carbon emissions from energy used to operate your home is your minimum offset target. Don’t be discouraged if carbon zero is currently unaffordable. Roof top generation capacity may be able to be added in the future and a range of other more affordable offset options such as accredited GreenPower and carbon offset programs are available in the interim. Aim for a net annual surplus where possible to achieve carbon positive status to repay energy and carbon embodied in the materials used to build and maintain the home during its life. Additional net export surplus can be used to offset carbon emissions from transport and food through adequate net export of renewable energy or accredited carbon offset programs. As the capacity of on-site generation increases, peak output on sunny days will exceed grid demand in many areas — the grid will be unable to use all the electricity being exported from on-site generation. On-site storage can be used to divert or delay electricity production to match demand. System design Final design and sizing of renewable energy generation systems is best left to accredited professional system suppliers. Get several quotes from referred installers and get them to check your demand calculations. Your choice of inverter (see Batteries and inverters ) is critical if you plan to expand your system at a future date. Oversized inverters can reduce efficiency but future replacement can be expensive. Recent developments in inverter technology offer more flexible solutions so check with suppliers and choose an inverter that best suits both current and future needs.
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