Something does not add up..

[Gavin A]

Hope it was his generation meter

me too...

 

[Gavin A]

They do in a vacuum, plus terminal velocity of all items falling to earth not acted upon via other forces will be the same :tounge_smile:

Now lets get back to Ohms Law ...... lol

not in my world they don't.

A rock that weighs the same as a feather would be known as a pebble, not a rock, so a feather will always fall slower than a rock even in a vacuum.

Now, if we were discussing pebbles and feathers.......

 

[Uklad]

Well I called the Dno at 4pm had a chat to a lovely lady about the high voltage with regard the pv setup and she amedietly said it sounds like you need it tapping... Anyway engineer turned up at 6:30 did some tests dispite his test was within range he took a look at my PVO logs and agreeded it needs to be looked at, so they are arranging a monitor to be put on my supply, watch this space

 

[moggy1968]

They do in a vacuum, plus terminal velocity of all items falling to earth not acted upon via other forces will be the same :tounge_smile:

Now lets get back to Ohms Law ...... lol

oh dear danesol, you completely missed the point!:banghead:

yes, they do in a vacuum, i.e. in the lab, but not in real life, thats why I said because of the presence of other factors. The same as in real life the voltage of your panels will not increase after may.

I know we have just had a long bank holiday but wakey wakey!!

 

[Earthstore]

One question to the OP where are you getting your voltage reading from?
Is it from the inverter or are you checking the incoming supply when the PV is not producing?

 

[moggy1968]

not in my world they don't.

A rock that weighs the same as a feather would be known as a pebble, not a rock, so a feather will always fall slower than a rock even in a vacuum.

Now, if we were discussing pebbles and feathers.......

so, if she weighs the same as a duck, she must be a witch!

 

[moggy1968]

One question to the OP where are you getting your voltage reading from?
Is it from the inverter or are you checking the incoming supply when the PV is not producing?

thats why I suggested he needs someone to look at the installation. It needs a proper evaluation on the ground.

 

[Earthstore]

long 2.5 maybe?

 

[Uklad]

Im getting my readings from the inverter but the engineer tested the incoming supply with the house disconnected and was getting 246v when he put the supply back on and the inverter started generating again it was measuring grid at 246.5v

03/04/13	19:20	10.457kWh	2.614kWh/kW	30W	66W	0.016kW/kW	23.5C	245.5V	-	-
03/04/13	19:10	10.446kWh	2.612kWh/kW	83W	24W	0.006kW/kW	24.0C	246.5V

 

[danesol]

Im getting my readings from the inverter but the engineer tested the incoming supply with the house disconnected and was getting 246v when he put the supply back on and the inverter started generating again it was measuring grid at 246.5v

03/04/13	19:20	10.457kWh	2.614kWh/kW	30W	66W	0.016kW/kW	23.5C	245.5V	-	-
03/04/13	19:10	10.446kWh	2.612kWh/kW	83W	24W	0.006kW/kW	24.0C	246.5V

IMO, this needs to be repeated at say peak generation time to see what the actual grid voltage is then... before reconnection

At least now you know its a fairly accurate reading, what you need to know now is why is goes up so high at certain times/generation periods - is it your kit and/or surrounding environment ?

 

[Uklad]

IMO, this needs to be repeated at say peak generation time to see what the actual grid voltage is then... before reconnection

At least now you know its a fairly accurate reading, what you need to know now is why is goes up so high at certain times/generation periods - is it your kit and/or surrounding environment ?

30/03/13

06:40

0.036kWh

0.009kWh/kW

137W

126W

0.032kW/kW

10.4C

250.5V

-

-

I think its environment sending it up to 250v and generation taking it to 253v im seeing a lot of voltage spikes with low generation

 

[moggy1968]

thats interesting, 246V is fine, but voltage spikes of 250 is going some. The previous advice of asking others in the area if they get problems with bulbs blowing a lot might be a good idea. I wouldn't make too much fuss to the DNO about your PV system as they may blame that and tell you to switch it off! are there a lot of other PV systems in the area (sorry if this has already been asked)

 

[Uklad]

thats interesting, 246V is fine, but voltage spikes of 250 is going some. The previous advice of asking others in the area if they get problems with bulbs blowing a lot might be a good idea. I wouldn't make too much fuss to the DNO about your PV system as they may blame that and tell you to switch it off! are there a lot of other PV systems in the area (sorry if this has already been asked)

Actually i noticed i local housing association has covered a full row of houses with panels i would estimate 25-30 kWh

 

[moggy1968]

ok, if thats on the same transformer that could push the voltage up

 

[Gavin A]

ok, if thats on the same transformer that could push the voltage up

no could about it.

 

[Earthstore]

Re your high voltage; What size is the AC cable to the inverter and what is the length of it from inverter to where it is connected to your supply?

 

[danesol]

Well in my experience and certainly as a "collective" you would be to contact your DNO and express a concern about high voltages and request them to come out to test and ultimately lower - naturally not mentioning you have Solar PV at this point, once you know your own house is in good order.

FYI - When they come out and test - they will take the raw tails anyway to discount any local issues to your internal wiring hence the above.............

 

[Uklad]

Re your high voltage; What size is the AC cable to the inverter and what is the length of it from inverter to where it is connected to your supply?

Sorry not been around for a while it looks like 2.5mm and about 5.5meter run

DNO are putting a Voltage recorder on for a week starting Monday.. i have started noticing voltage spikes even when im not at peak gen..

01/06/13	19:40	22.980kWh	5.745kWh/kW	353W	672W	0.168kW/kW	-	243.6V	-	-
01/06/13	19:30	22.868kWh	5.717kWh/kW	746W	498W	0.124kW/kW	-	250.0V	-	-

My system can not be doing this ?

 

[Uklad]

Update..

DNO put a voltage reader on for a week and reported back to me that line was within tolerance and they would investigate it further if anything can be done..

I did not hear anything for Months so written if off, out of the blue a get a phone call from an engineer at the DNO who was very knowledgeable about the subject and stated that PV is proving to be challenging in rural areas especially with the mix of domestic and commercial properties in close proximity, but he said he would look into the options for me..

A few days later he called back and told me they have tapped down the voltage at the primary substation for the area, not just my sub station and managed to knock off about 5 volts..

Good result i just have to wait until late spring now and see if the inverter cuts out..

 

[Worcester]

Thanks for updating us, and good to hear you've got a result.

 

[Uklad]

I forgot to mention the voltage spikes stopped some time ago there was a lot of work in the area by the DNO after some power cuts due to building work round the corner not seen the spikes now

 

[puddy]

Which model of owl device have you got?


I don't think any owl can show how much energy being exported to the grid

Click on text below for my review for solar monitoring devices

http://www.electriciansforums.co.uk...orum/85306-very-quick-review-top-4-solar.html

 

[oldsalty]

Agreed - I have a Landis&Gyr E110 electricity meter an although it says "rEd" it does not add export to import (neither does it go backwards like the old mechanical meters).

By chance my solar array also happens to have a Landis&Gyr E110 to measure export.

As some people have suggested: perhaps the power generated by the solar is not being efficiently used ("use it or lose it"), but on the other hand some people with solar over-estimate how much it produces and switch everything on (sometimes in a wasteful way), resulting in a lot of power being imported from the grid because the power demands are so high that the solar can only provide a small portion of it.

At the moment, I'm generating about 0.6kW (3.7kW solar array) on a "white cloud" afternoon. My computer is running (0.2kW), the central heating is running (0.2kW for pump/fan etc), my wife is watching TV in the other room (0.2kW) so we're using all it's producing. We just boiled the kettle (3kW) so during that time we were still having to import 3kW of power for five minutes. Not to mention if we were running the washing machine, power tools/garden tools etc.

Did you leave out the carp pond UV lamp, pump and filter intentionally, oops, nearly forgot the freezer in the garage?