Charging using extension leads
I am seeking to take advantage of members electrical/electronic expertise, to learn what limits should be taken into consideration when using extension leads for charging.
* What should be the maximum length of an extension lead?
* Should you use 20 or 15 amp cable?
* Should you use 20 or 15 amp plugs?
I seem to recall that Vectrix had approved the use of an 8 foot lead for charging (hardly seems worth it!)
I would guess that the higher the amperage of the cable & plug combination, this should provide the best flow of electrons allowing a longer cable length.
But is there some formula on how these variables will affect the length of extension lead that can be used?
You should have no problem using an extension cord to charge a Vectrix. In the US it draws no more then 15 amps on a 120 volt service. The longer the cord, the more voltage drop there is--for a short cord, 12 gauge is overkill, for a longer cord you could go to 10 gauge. I don't understand Vectrix's stand on extenison cords. Every socket you plug into is an extension from somewhere. If you plug directly into a 15 amp wall socket, it most likely is being fed by a small 14 gauge conductor from your circuit breaker panel--that is smaller in gauge then either of the cord sizes I suggested and the wire run could be an easy 30 feet or more. If you have the choice of using a 20 amp socket, use it. In the US 20 amp sockets are fed by a minimum of 12 gauge wire and most can be identified by a different shaped hole in one side of the socket to accomadate 20 amp plugs.
I think you'll find the concern is related not to performance or voltage drop issues, but the more mundane one of physical safety.
The longer the cord, the greater the chance to trip over it or somehow become obstructed by a messy - plug/socket connection in an inappropriate place. Also add to this the prospect of the connection becoming separated, leaving the bike in an uncharged state when you most need it.
Obviously Vectrix guys never worked a constructuon site. We'd pack nothing but 12 guage cords and think nothing of 100' of that before splitting it three ways for three saws, each on thier own 50' cord. Any more than that though, and you would have to wait for silence to pull the trigger on your saw, or you might have to go flip the breaker back on 150' away. I'm not sure how a long cord gets tripped on or unplugged easier than a short one. I have been told not to pull a lot of power through a coiled up cord though.
Anyway, if you pull about 15 amps through a 50' 16 guage extension cord for 12 hours or so, it will get warm, but that's it, it won't catch fire or anything. If it does melt down, it will be because of a bad plug, not the wire, and crappy plugs come on all guages of cords.