Is there a limit on solar PV generation? Q&A
Posted by Paul Hutchens on 11 October 2010 at 9:27 am
Q: I am about to install a solar PV panel system on my roof and have come across a problem with my Distribution Network Operator (DNO). I want to take full advantage of the feed-in tariff and was planning a 3.995Kwh system on my roof. Unfortunately the DNO insist on increasing the cost to include a relay and a site visit. The reason I am given is because I will go over the 16 Amp limit generated (at max).
A: The guidelines state that you can install a system of up to 16 amps per phase without asking permission of the DNO. Above that level you have to ask permission so they are within their rights to do as they suggest.
Some DNOs may take a more relaxed approach than others but we have no control over that.
If you do not want to pay for the additional site visit and relay then it may be an option to reduce the size slightly to bring it back under 16 amps.
I suggest that it is worth discussing this with your installer because you can bring down the current drawn by the configuration of the system or use of different solar PV modules.
Also bear in mind that the rule applies to each phase so you can have triple that amount - total 48 amps - if you have a 3-phase supply. However this is likely to be more appropriate for larger buildings such as schools or commercial builidings.
Photo by gustaffo89
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