Discuss 16A threshold for G83 - Array size or inverter output? in the Solar PV Forum | Solar Panels Forum area at ElectriciansForums.net
The saga continues. I was told today by an engineer at Central Networks that it is inverter output that is important when considering the G83 threshold.
Hopefully this will be the stance all DNOs take before long.
Well you can work out the max output in amps if you know the max ac output of the inverter
A customer of ours has had a tripping fault, where by his 16amp mcb has been tripping on peak days. This was caused by the assumption that his ac supply was 240vac (we know what it is meant to be!), but he was at the edge of the network on a fellside. Because he was getting occasional ac volt drop to 230vac or slightly lower this tripped his breaker because the amps had risen over 17amps on peak days!
Food for thought when working in rural areas.
The thing is, you will not be limiting the export to 16amp/phase. You know and I know that this does not make much difference, but DNO would probably get upset if found out?If you left as 16amp though it would be a pain with nuisance tripping at peak, possibly system off during customers summer hols abroad?Could you not install a 20amp mcb? The mcb is just to protect the cable and not limit the output?
The thing is, you will not be limiting the export to 16amp/phase. You know and I know that this does not make much difference, but DNO would probably get upset if found out?If you left as 16amp though it would be a pain with nuisance tripping at peak, possibly system off during customers summer hols abroad?
And is the G83 limit 16 amps at the current operating voltage or at 230?
When we got our system installed last October, the electrician installed a 16A MCB. We had a little chat about the potential output from a SMA 4000TL and then he swapped it for a 20A MCB. Everybody happy.Could you not install a 20amp mcb? The mcb is just to protect the cable and not limit the output?
I know UK Power Networks use 240V to work out the output current while Southern Electric use 230V. This means you can't install as big a system on an SE network as you can on a UK PN's!
Reply to 16A threshold for G83 - Array size or inverter output? in the Solar PV Forum | Solar Panels Forum area at ElectriciansForums.net
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