pvb
Well-known member
I haven't taken umbrage at all. I am, though, amazed at some people's inability to express themselves clearly.
Wiring up a shunt
- Thread starter boatmike
- Start date
I haven't taken umbrage at all. I am, though, amazed at some people's inability to express themselves clearly.
boatmike
Well-known member
I have to retort that over the years I have found this forum very useful. There are some instances where others have helped me greatly and some where I have been happy to help others, but it seems so easy for a practical query to turn into an argument because certain posters are confrontational for the sake of it. If you read through this thread again you will see that the original question was answered extremely well and I do usually thank people for their help which is much appreciated. I have no ambition or intent to be rude or do anything more than address practical problems as best we can. If in that endeavour I fail to express myself to the high standards you expect I apologise. I only sought to explain to you why your assumption was mistaken not give offence.
theoldsalt
Active member
Boatmike,
"its range is + or - 150amps and its a 500amp shunt"
Could you please advise the make and model of your meter and shunt as I am interested in fitting one.
"its range is + or - 150amps and its a 500amp shunt"
Could you please advise the make and model of your meter and shunt as I am interested in fitting one.
boatmike
Well-known member
http://www.ebay.co.uk/itm/ws/eBayISAPI.dll?ViewItem&item=300727915634
Hopefully, if I have done it right, this should take you to the e-bay item. Comes direct from China but looks surprisingly good quality! Works anyway....
elton
Well-known member
I wonder how accurate these Chinese shunts from eBay are. Cheap shunts ar notoriously innacurate, because they haven't been trimmed. quality shunts are typically accurate to 1/4%.
pvb
Well-known member
Doesn't really matter, because it only has 1A resolution. With a typical charge current of, say, 50A, it could be 2% inaccurate and not be a problem.
theoldsalt
Active member
Many thanks. I have placed an order for one.
boatmike
Well-known member
That was what I thought too and at £13 each including shunt I thought it worth a try. Being digital it at least gives an advantage over analogue dials with no graduation which appears to be the norm.
vyv_cox
Well-known member
I think that you can see in the link photo that it has been trimmed, saw cut beneath. I have a similar one, although only for 100 Amps, perhaps from the same supplier. It has a couple of saw cuts that are presumably for trimming purposes.
Jegs
Well-known member
- or pos
Just a thought, doesn't the current flow from the neg to the pos & might a reading from neg be better because the juice hasn't passed through anything else?
John G
Just a thought, doesn't the current flow from the neg to the pos & might a reading from neg be better because the juice hasn't passed through anything else?
John G
VicS
Well-known member
Sorry but that's complete rubbish. ( or a leg-pull) No other way of putting it sorry
Suggest you read the electrical notes at http://www.tb-training.co.uk/cover.html
Last edited:
Jegs
Well-known member
Rubbish
Vic,
It had a question mark & it was based upon a vague memory [?] regarding the movement of electrons.
John G
Vic,
It had a question mark & it was based upon a vague memory [?] regarding the movement of electrons.
John G
VicS
Well-known member
Questions are correctly terminated with a question mark.
elton
Well-known member
I wouldn't regard what may or may not be a "couple of saw cuts" as "evidence of trimming". When installed, the device becomes a critical part of the power supply chain, and is potentially a weak link both electrically and mechanically. Good luck if you're happy with it. I wouldn't buy one.
halcyon
Well-known member
nigelmercier
RIP
- Joined
- 20 Jun 2007
- Messages
- 16,234
- Location
- Live in Kent, boat in Canary Islands
Conventional current flows from positive to negative, but that is because the concept of current was deduced before it was discovered that current is actually caused by electrons flowing the other way. In order to make some sense of this, the concept of a "not electron" or "hole" has been invented.
It's an interesting thought that electrons would get tired and shagged-out by passing through a load, but if this is the case, nobody has discovered it yet. So, no is the answer to this point.
Last edited:
theoldsalt
Active member
Nigelmercier
To be fair, I think Jegs could be credited with being partially correct if by "current" he is meaning the flow of electrons.
However I have not heard of a "non electron" or "hole"
To be fair, I think Jegs could be credited with being partially correct if by "current" he is meaning the flow of electrons.
However I have not heard of a "non electron" or "hole"
VicS
Well-known member
I've ceratinly heard of "holes" but only in connection with semiconductor theory. Not someting Nigelmercier is making up.
Not heard of "non electron" though
theoldsalt
Active member
VicS,
Thanks for that - it never ceases to amaze me what we can learn on this forum. (not a sarcastic response BTW)
http://en.wikipedia.org/wiki/Electron_hole
Thanks for that - it never ceases to amaze me what we can learn on this forum. (not a sarcastic response BTW)
http://en.wikipedia.org/wiki/Electron_hole
nigelmercier
RIP
- Joined
- 20 Jun 2007
- Messages
- 16,234
- Location
- Live in Kent, boat in Canary Islands
Are you'd suggesting I make stuff up?
In retrospect, I shouldn't have put non electron in quotes, I was aiming to convey the opposite of an electron, but without using the term "anti-electron", which is a completely different kettle of quarks.