When connecting a solar power system to the grid, the application process involves submission of a form to the relevant Distribution Network Operator (DNO). Which form and when are two important matters covered in this article.

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Registering Solar Generators with the DNO

Depending on who you ask these days, different sized systems require different application forms be sent to the DNO. The general expectation is that the larger a system, the more preemptive information is required to be transferred. Let’s look at the two main forms that will affect systems of 4kWp and smaller.

Small Scale Generator and the G83

Systems deemed to be under 16 amps per phase are considered ‘small scale’. They can be installed straight away and registered by submitting a G83 form to the DNO following the installation. EON has a copy of their G83 form here for download.

In order to establish if your generator is under 16 amps per phase, it is best to consult with your solar installer. The correctly trained electrical staff they have on hand will be able to assist. As a rule of thumb, systems under 3.6kWp will be under the 16 amps limit the vast majority of the time. However, seeing as the feed-in tariff changes after 4kWp this presents a grey area for installations between 3.6kWp and 4kWp.

Large Generation and the G59

For generators over 16 amps per phase it is a legal requirement for the DNO to be consulted prior to an installation taking place. In addition, a G59 form (download here) is required to be submitted. The process of a DNO reviewing and returning a successful G59 can take up to 8 weeks.

Obviously the important aspect of this process is establishing the amp levels of the proposed solar power installation with the installer’s electrician. The tilt, orientation and location of a solar generator can affect the amps, so it is vital that anyone installing systems from 3.6kWp upwards establishes the correct process for registering their system. This is especially the case with the deadlines of April 1st and July 1st 2012.

Written by Jarrah Harburn


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