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Ribenapigeon |
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Copycat73 |
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Triton Thrasher |
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stinkwheel |
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stinkwheel Bovine Proctologist
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Posted: 13:39 - 16 Feb 2018 Post subject: |
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It would be better (in terms of electrical efficiency, not necessarily safety or convenience) to run a mains extension cable out to the shed then plug the charger in there. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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- Super Spammer
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Posted: 13:50 - 16 Feb 2018 Post subject: |
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Yes, hugely.
DC voltage drops considerably even over short distances with thinner wires. I did the 12V electrics on my campervan and the idea is to use thicker cable and the shortest cable runs possible.
There are charts showing the drop for various cable thicknesses over distance.
Here's a calculator.
https://www.voltagedropcalculator.com.au/ ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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MCN |
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MCN Super Spammer
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 16:29 - 16 Feb 2018 Post subject: |
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The trouble with armoured cable is a) Cutting it. then b) Terminating it.
I'd just use arctic cable with an RCD on the end unless you intend to make it permanant. I'm assuming since you're considering running a long twin core DC cable out, you're not going to be walking/driving over it or shutting it in a door.
In that case, armoured would be the weapon of choice. Ideally buried. And make it a proper fused and RCD-ed spur out to your shed with a secondary consumer unit attached at that end. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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MCN |
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MCN Super Spammer
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Posted: 18:49 - 16 Feb 2018 Post subject: |
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I hacksaw to nearly the length then peel the plastic back and nip the armour to length using side cutters. It is only galvanised steel wire so not incredible tough.
RCD is a good idea. It would also save tripping your ring-main breaker and shutting down the telly and so bring forth all that is hell down on your arse when Enders or any of that other proletariat shite is being pumped into the house and she is watching it. ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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Islander |
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Islander World Chat Champion
Joined: 05 Aug 2012 Karma :
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Posted: 22:10 - 16 Feb 2018 Post subject: |
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mpd72 wrote: | Yes, hugely.
DC voltage drops considerably even over short distances with thinner wires. I did the 12V electrics on my campervan and the idea is to use thicker cable and the shortest cable runs possible.
There are charts showing the drop for various cable thicknesses over distance.
Here's a calculator.
https://www.voltagedropcalculator.com.au/ |
There's no difference between AC and DC when it comes to voltage drop. It relates to Ohms law, the higher the current drawn , the higher the I2R losses likewise the smaller the cross sectional area of the cable, the higher the I2R loss.
Also, the higher the voltage for a given load, the lower the current needed - this is why AC is a huge advantage in transmission line systems. It can easily be transformed to higher voltage lower current and vice versa.
The easiest fix for this is to run a mains extension out, rather than a DC extension. |
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Rogerborg |
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Rogerborg nimbA
Joined: 26 Oct 2010 Karma :
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Posted: 23:43 - 16 Feb 2018 Post subject: |
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Sure, in the 19th century. Since about 1950 or so, ~800kV HVDC has been practical and preferable for transmission. However, we'd set up an AC grid by then, so out comes the Not Invented Here cognitive dissonance.
The issue is what voltage means when you're comparing DC to AC. With DC, it's a constant relationship between the two polarities. With AC, you end up fudging it as some root-mean-squared relationship, and for some of your wave, you're pissing away all your low potential in total transmission loss.
But OP doesn't need to know that. The tl;dr version is to transform household "240" AC to something like 20 kV DC, and pump that out to the shed. To be sure that you're getting it through, strip the wire ends and then grasp one in each hand. Be sure to do it quickly and firmly to minimise arcing. If you feel a slight tingle, you're good to step it down to your 12V charging circuit. ____________________ Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike |
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Islander |
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Islander World Chat Champion
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Pete. |
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Pete. Super Spammer
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Posted: 07:50 - 17 Feb 2018 Post subject: |
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All very interesting but talking about high-voltage AC and DC transmission doesn't address Parky's question.
Yes, at 12-15v there's a definite voltage drop problem over 15 metres if you keep the wire size the same. Use the heaviest wire you can find for it - double the cross-section half the resistance. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Copycat73 |
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Copycat73 World Chat Champion
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MCN |
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MCN Super Spammer
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Posted: 11:25 - 17 Feb 2018 Post subject: |
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You could do it all carbon neutral.
Set up a wood-fired steam boiler in the house.
Run your steam lines (out-going) and condensate (in-coming) to/from the shed.
Connect to a Steam Turbine or Reciprocating engine driven 12 V DC generator in the shed.
And connect to your charger.
You could also use an AC generator and run through an inverter/transformer to drop/regulate for 12v DC.
That may be more efficient and easier to find the parts.
I would recommend insulating both the out-going steam pipe and the in-coming condensate lines. You will save a lot of energy by doing so and wet steam tends to accumulate so making it more difficult to get back to your boiler. That can mean running excess pressure just for return flow. ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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bugeye_bob |
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bugeye_bob World Chat Champion
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Triton Thrasher |
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stinkwheel |
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stinkwheel Bovine Proctologist
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Rogerborg |
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Rogerborg nimbA
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Posted: 12:58 - 17 Feb 2018 Post subject: |
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Craaaaaazy thought: take the battery indoors and charge it there.
If it's not holding a charge because it's buggered, buy another battery.
I realise these strategies will avoid a fite with your pikeyer neighbour, mind, so they may not apply to your particular situation. ____________________ Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike |
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Islander |
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Islander World Chat Champion
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Ribenapigeon |
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Ribenapigeon |
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Triton Thrasher |
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Ribenapigeon |
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Triton Thrasher |
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Old Thread Alert!
The last post was made 6 years, 71 days ago. Instead of replying here, would creating a new thread be more useful? |
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