If you’re adding solar PV, it’s important to get the best possible financial return on your investment by maximising the amount of power generated across the year:
- use the maximum solar pv area1 possible: your installer should advise. South facing is best and, in order of suitability, this is usually:
- pitch roofs get most sun and make best use of space because panels can be butted together;
- flat roofs make less efficient use of area because they require spacings between panel arrays and may require planning permissions, then;
- ground installation: if you (and your neighbours) can live with them.
- if you have sufficient panel area to generate more than the 3.68kW export limit, get your installer to make a G99 application to your DNO to get the limit raised. The application is often free and will allow your installers to fit a bigger pv system;
- oversize your solar pv generation capacity to the maximum “oversize” limit permitted for the inverter you are using: this is usually between 130 and 150 percent of its maximum power output. This allow your inverters to run safely at their maximum output for a greater proportion of the time.
- Subject to your inverter capacity and G98 or G99 export limit. ↩︎
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