Earth Notes: General Bibliography (hart-davis202216ww)
General public bibliography for EOU and related research. #bibliography #dataset
- [hart-davis202216ww] Hart-Davis, Damon 16WW Eddi PV DHW Diverter Export Margin Analysis (2022-08) (accessed ), , report/number EOU-eddi-diverter-export-margin-analysis, language en-gb (www) (BibTeX).
keywords
UK, London, Kingston-upon-Thames, 2023, snapshot, domestic, behind-the-meter, storage, heat, heat battery, solar, PV, diversion, eddi, grid, export, margin, modelling
abstract
As more microgeneration is added to the grid, whether behind the meter or elsewhere, optimising the nuanced interactions between generation, storage and the wider grid becomes increasingly important. For example, sometimes the Eddi solar PV diverter at 16WW diverts energy to the Sunamp Thermino heat battery even at times of peak grid demand (eg early evening), because that is when the Thermino has autonomously decided that it is no longer full and can accept more energy. It would be better to be more grid-friendly and spill more generation to grid especially at these times, without losing too much 'free' hot water (DHW). It would probably be best to dynamically vary the Eddi "Export Margin" based on time of day or grid state, but this is not possible as of 2022-08. Therefore, simple modelling was performed to pick a new fixed value for the Export Margin, and the results were somewhat unexpected! Raising the margin from the current 100W to around 400W has proved possible without significant loss of diversion-heated DHW, providing much higher support to the grid when excess generation beyond in-home electrical needs is available. This slightly less 'greedy' approach may be widely applicable in similar systems, while being easy and free to implement.