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Can anybody tell me with a Voltage of 250 at the house CU and a grid impedence of .4 what size of cable would I need if the inverter is 70m away generating 17.39 amps ---------- Post Auto-Merged at 22:41 ---------- Previous post was made at 22:37 ---------- The PV generates about 3KW then...

Can anybody tell me with a Voltage of 250 at the house CU and a grid impedence of .4 ohms what size of cable would I need if the inverter is 70m away generating 16 amps

I have asked the DNO for a copy of their data log but they say give me one but they did give me some figures Min 227.9v Ave 240.7 Max 247.8 when asked about the 253v in the email they rechecked and said there where a couple of spikes in the middle of the night at 255v. All these readings...

He did mention talking to SMA,but to be honest if you watch the screen it alternates between Volts and Amps so you never get a reading when the inverter trips I think thats why the installer invested in a dataer logger ---------- Post Auto-Merged at 20:36 ---------- Previous post was made at...

262v was at midday and bright sun then it triped out

To be honest Ivor this idea is a non starter as if I suggest it to my installer it would be my idea and if it didn't work ,and I have my douts,it would be my fault ,I would much rather stick to manufactures instulation guides and get the right size of cable thank you

According to my installer the voltage readings are only a rough guide ,not precise enough to be accurate, this is wyh he invested in a voltage logger, but for whats it worth I did see 262Volts on the display

In my have inavertanly mis led.... The volt recording was a failure as when the sun was shinning around mid day the inverter would only operate for about 3-5 seconds then cut out ,it did this a few times,only running for a few seconds then cutting out,after a few times a red light came on ,the...

I will measure tomorrow

Will DO

BREAKING NEWS BREAKING NEWS BREAKING NEWS The instaler (in the middle of the volt logging} has decided to fit a new cable :) There's nowt funnier than FOLK

OMG what happend when I went to bed,look Ivors views my irritate a lot of you (99.99%) but i am sure you will all agree everybody has an opinion and he does have a right to air his opinion(free speach and all that) so please no more witch hunts or perceived threats thanks So Watchdog's Avatar...

I agree..........and its given a nice sunny day tomorrow

Thats intresting, do you have a link to the sma guide to grid connection info

Sorry I don't understand the first part of the question,but the cable goes 6 mm x 2 x 130m then 4mm x 2 x 20m... ---------- Post Auto-Merged at 21:27 ---------- Previous post was made at 21:22 ---------- The meter is a CHAUVIN ARNOUX modle No CA 8230

Had the installer round today, he has decided to put a voltage recorder at the inverter connections to moniter the voltage for a few days, he says when it trips out and if the voltage is below 264v he will have proof the trouble its not the cable but the inverter At least he's trying

No

I have a NAPIT minor works Electrical Certificate, I think it only mentions the RCD in the barn

There is an RDC on the CU in the shop which the electric goes through and there is a RCD on the barn CU where the panels/inverter is

Heres some of the emails thanks for your email Unfortunately I don't understand ( as I am not an electrician) What I want to know,is given the potential load on the cable ( given in the email on 21st April) Of about 70amps+3amps for the farm shop ,was the installer correct in fitting the PV...