By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Dremel

Battery charger cables

Why so big?

All Topics | Latest Posts

Search for:  in Thread Title in  
Bob Abell29/08/2014 19:54:53
avatar
8270 forum posts
2530 photos

Just bought my wife a mobility scooter, it has two 12v batteries

The charger comes with OTT heavy duty cables, they must be at least 6mm dia!

The charger is intended to be plugged into a household wall socket

Question....Why are the charger cables so huge compared to household wiring?

I realise this is not a boating question, but it may be relevant to Paul's power supply for his Thor build!

Bob

shipwright29/08/2014 20:45:14
avatar
250 forum posts
54 photos

Bob,

Basically the current drawn from the supply determines the diameter (or more correctly the cross sectional area) of the copper cable. There are tables for looking up the diameter of the copper cable for a given current rating. Maybe your charger has a fast charge mode - that could easily require a cable capable of carrying a current of 10's of amps. The same rules apply to mains cables. The larger the cross sectional area the lower the resistance per metre. There will be a voltage drop between the ends of the conductor and for long cables this might be significant. The other factor is that there will be energy loss in the copper which will heat the cable - and if the current is large that heating effect could be significant and undesirable from the point of view of the cable insulation.

Ian

Bob Abell29/08/2014 20:55:08
avatar
8270 forum posts
2530 photos

Thank you, Ian

What is the point of chunky cables, when the household cables are so thin in comparison?

It seems almost dangerous?

Bob

shipwright29/08/2014 21:40:40
avatar
250 forum posts
54 photos

Bob,

Without seeing the cables it is difficult to comment further. Do you know the Ah capacity of the 2 12v batteries and what does the user manual say about the typical time taken to fully charge the battery (from a fully discharged state) ?

Ian

ashley needham30/08/2014 08:05:40
avatar
5608 forum posts
177 photos

Bob. I recon they probably use the same charging leads for several products, so they make only one type and supply them on all their chargers ???

OR it may be a safety thing...if there is a fault somewhere, its your house wiring that melts first, and not the charger leads...

Ashley

Bob Abell30/08/2014 08:10:46
avatar
8270 forum posts
2530 photos

Hello Ian

The batteries are two 12v of 12AH each

They take from 8 to 12 hours typical charge at 2amp

They recommend a 48 hour continuous charge, once a month

But thinking about it......Household wiring is very long and can dissipate the heat quicker than the short charger cable?

Thank you for replying

Bob

shipwright30/08/2014 08:16:56
avatar
250 forum posts
54 photos

Bob,

2 Amps isn't much current - so I don't know why your charger leads are 6 mm in diameter.

Ian

Bob Abell30/08/2014 08:21:32
avatar
8270 forum posts
2530 photos

Exactly!

Bob

lnvisibleman30/08/2014 08:27:55
avatar
257 forum posts
52 photos

The truth is that Bob only bought the scooter so he had a readily at hand source of low speed, high torque motors.

smiley

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Boats? Use our magazine locator link to find your nearest stockist!

Find Model Boats!

Support Our Partners
Premier Thursday
Shrek
Pendle Boilers
Premier March
PremierJuly 2019
JSB MODELS
Sarik
Shopping Partners
Social Media

'Like' us on Facebook

Follow us on Twitter

Pin us on Pinterest

Member Contributions
Distributors of Model Boats for our overseas readers
Highlights

Make sure you never miss out on the latest news, product reviews and competitions with our free RSS feed

Make your own contribution to the Website

We welcome well written contributions from Website members on almost any aspect of Model Boating with a particular emphasis on practical hints, tips, experience and builds.

In order to maintain a consistent standard and format, all suggestions should first be sent to me by Personal Message for approval in principle. Only a very limited amount of time is available for editing contributions into a suitable format for placing on the website so it is important that the material is well presented, lucid and free from obvious spelling errors. I think it goes without saying that contributions should be illustrated by appropriate photos. I shall be happy to give advice on this.

The Member Contribution area offers space for short informative mini articles which would not normally find a place in Model Boats magazine. It is an opportunity for Website Members to freely share their  expertise and experience but I am afraid that virtue is its own reward as there is no budget to offer more material recompense!

I look forward to receiving your suggestions.

Colin Bishop - Website Editor