GRID / DNO
Solar PV and battery storage are not designed in isolation from the electricity network. The connection route can influence inverter capacity, export settings, programme and commissioning evidence.
G98 and G99 are connection routes
Engineering Recommendation G98 covers qualifying smaller generation connected in parallel with the public low-voltage network. Where the installation does not meet the G98 route, G99 applies and the DNO process is generally more involved. The exact route depends on the generating equipment and aggregate installation, not simply the number of solar panels.
Where G100 fits
G100 sets requirements for customer export and import limitation schemes. In practice, an export limitation system can be part of an agreed connection design where the DNO requires the site’s net export to stay below a defined limit.
For mixed solar and battery systems, the connection assessment needs to consider how the generating assets can operate together. That is one reason grid strategy should be resolved before the equipment schedule is treated as final.
Related: Grid / DNO & Smart Energy · Commercial energy systems
Sources: Energy Networks Association Engineering Recommendations G99 and G100; ENA Connect Direct. See energynetworks.org and Connect Direct. Requirements should be rechecked for the specific installation and DNO before connection.
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