UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > General Vintage Technology Discussions

Notices

General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc.

Closed Thread
 
Thread Tools
Old 31st May 2020, 1:53 pm   #61
trobbins
Heptode
 
trobbins's Avatar
 
Join Date: Oct 2009
Location: Melbourne Australia
Posts: 898
Default Re: How much DC on your mains ?

Transformerless inverters (ie. many of the PV inverters) are speced to have a very low DC level. But it could be likely that on average all the PV inverters do not additively contribute a net DC current flow.

Battery inverters are typically transformer coupled (but I don't have first hand info on Tesla products).
trobbins is offline  
Old 31st May 2020, 2:50 pm   #62
Mullard_Nut_74
Tetrode
 
Join Date: Mar 2020
Location: Sydney, New South Wales, Australia.
Posts: 65
Default Re: How much DC on your mains ?

I highly doubt a decent commercial grade battery unit like a Tesla wall would be feeding DC to the mains.
I was thinking more along the lines of home built units.
Every man and his dog has a Youtube video up these days showing how they made their own Tesla wall from reclaimed laptop batteries.
Im sure there would be home experimenters out there that have not correctly isolated their battery pack from the mains.
At the very least the might be causing a spike in DC on the negative rail if connected wrong.
Speaking of negative RAIL. I remember a house we lived in once got a DC voltage up through the old copper drain pipes from the electric trains from a fault at the station near our house.
Having a shower was sometimes a shocking experience.
__________________
If only he could have used his evil genius for niceness instead of evil. Max Smart 18 Sept 1965
Mullard_Nut_74 is offline  
Old 31st May 2020, 3:05 pm   #63
woodchips
Octode
 
Join Date: May 2010
Location: Grantham, Lincolnshire, UK.
Posts: 1,172
Default Re: How much DC on your mains ?

Found that reference. don't they get buried quickly?


https://electrical.theiet.org/wiring...hich-rcd-type/
woodchips is offline  
Old 1st Jun 2020, 1:48 am   #64
Refugee
Dekatron
 
Refugee's Avatar
 
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,549
Default Re: How much DC on your mains ?

Solar panels in large fields, mostly the early ones sound like a 405 TV set with mains ripple on the line output stage.
They chop the DC to make a set of half sine waves and then switch them to make a set of three sine waves to apply to the 11/33KV three phase drop cable on the closest pole.
They do about 1/4MW per acre on a clear sunny day.
If the stock in the warehouse turns over a couple of times before the go ahead to erect the panels comes up the technology can sometimes improve so much that things can get a bit "toasty" if the drop cable is only rated at 100A.
It was toasted copper with melted vinyl over it at this location.
Attached Thumbnails
Click image for larger version

Name:	DSCF4606.jpg
Views:	84
Size:	138.7 KB
ID:	207341   Click image for larger version

Name:	DSCF4621C.jpg
Views:	92
Size:	64.0 KB
ID:	207342  

Last edited by Refugee; 1st Jun 2020 at 1:53 am. Reason: grammer
Refugee is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 1:08 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.