The off-grid PV-battery powered home revisited; the effects of high efficiency air-conditioning and load shifting

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Goldsworthy, Mark ORCID ID icon; Sethuvenkatraman, Subbu ORCID ID icon


2018-03-12


Journal Article


Solar Energy


172


69-77


The potential for residential households to go ‘off-grid’ with a photovoltaic-battery storage system in a location where a conventional connection to the electricity network is available has received recent attention. Several studies have reported that at present, in Australia the economics are not justified. These studies have used unmodified electricity consumption profiles from grid-connected households as input to their off-grid system analyses. However, households looking to go off-grid may be motivated to make basic modifications to their consumption pattern so as to minimise the size of the PV-battery system. Here the effects of i) shifting the booster time of electric storage hot water system to coincide with peak irradiance, ii) improving the efficiency of air-conditioning appliances, and iii) shifting pool pump operation and improving pump efficiency are compared and assessed. The analysis uses sub-circuit measurements of electricity consumption from 28 households for up to 2 years. Results show that the hot water and a/c adjustments in particular can each reduce the payback period by several years, even accounting for the fact that the appliance efficiency improvements also lower the grid connected electricity costs. For households seeking to go off-grid, any changes to electricity load profiles that reduce peak consumption in particular, improve off-grid system economics in comparison to grid electricity, since the true cost of delivering electricity from the grid at peak times is typically spread across all consumers.


Elsevier


Solar photovoltaic, off-grid, battery, air-conditioning, hot water, pool pump


Engineering not elsewhere classified


https://doi.org/10.1016/j.solener.2018.02.051


Funding Body NameProject/Grant ID
Australia. Department of IndustryEUDM


EP178216


Journal article - Refereed


English


Goldsworthy, Mark; Sethuvenkatraman, Subbu. The off-grid PV-battery powered home revisited; the effects of high efficiency air-conditioning and load shifting. Solar Energy. 2018; 172:69-77. https://doi.org/10.1016/j.solener.2018.02.051



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