I read this and was going to say sonthing but didn't Now that I have time , here's what I did (and will fix somday ) First of all ,I like meters espealy old one . anologs out of old stuff .It's the look but I like the digtal for the excact info . I got 4 in my truck to anolg which always work and one dig which always has a dead recharbable battery and a 1/2 burned out e-meter many things on the truck that worked, don't now (littlefield don't start that thing up till I get some sleep). I have a 12 postion switch which i could look at each set of 2 gollf cart batts or acc bat and charge the weekest on the pannel (70 what) 1/2 the realys are brunned out now but It was nice when it worked (littlefield).I also like to know whats going into the batt when charging and I don't want to read 40 amps on a anolg meter thats full scale amps is 600 amps. dose everone know how to tap a wire to get a voltage drop to get a amp meter for heavy amp flow ? Nice thing about this is you get a full scale reading at whatever amps you want. If you don't know how this is done ask ,some one will. Now the neat part .using a double pole switch run one wire from some part of the -charging wire ( longer for more senativty shorter of more amps) to on1 and one wire from - batt to on 2 . Now the middel wire from the switch goes to the meter and the other meter wire goes some were inbetween the other two(on1 and on2) (funny thing is that if hooked up right the polarity will be right for both charge (0 to 40 amps) and discharge ( 0 to 600) You set the range by were you put the wires. or buy one . ( ham radio people us to make there own raidos thats what the fun was about .They have lost that nowadays . EV's can be the same. Some one post how to do this with motor /battery amps . I am leaving my wife;- ( so may not be posting ( as often as computer is in house and I will be staying at want to be EV shop (old house down the street , hope city dosn't notice all the cars ) would you like to hear a story (first night in shop) it funny . title "I feel like monkeys are flying out of my butt" keep your hoods up . Land man Steve Clunn I can't see the top ten page as its stuck on the side left of screan .I want to get my truck up befor littlefield (sorry Mr littlefield If I took all my fustrations out on you . I feel a crow dinner coming on . good luck saterday .If you got somthing you better get some people who know what there doing to controll it as I CAN SLEEP . Last thing I rember before falling asleep was Dan spraying me down with bug spray (dan "better figer $5 a week for bug spray"). ----- Original Message ----- From: "Peter VanDerWal" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, September 04, 2002 10:34 PM Subject: Re: V/A meters. Where do they go?
> It all depends on what you want to know. Personally I think if you only > have one volt meter it MUST be on the batteries. Monitoring motor > voltage is a nice gee wiz type of thing, but not very usefull for most > folks. Monitoring pack voltage is essential to maintaining a healthly > battery pack. > > As for current, monitoring battery current is nice and can be usefull; > but it's hard to do anything usefull with it unless you are logging the > readings (like with an E-meter) . However, there is one usefull thing > you can do with a battery current reading, you can compare it to battery > voltage as a type of early warning of battery problems. If the battery > voltage is sagging more than usual for a given current draw then you > pack has problems (maybe just needs equalizing). The only porblem is > trying to read two meters at the same time as you are trying to drive, > this is more dangerous than talking on a cellphone. > > Monitoring motor current is not much use unless you are worried about > overheating the motor in which case you need a brush temperature meter > not a current meter. It'd be nice to have a motor loop current meter, > but you can live just fine without one. > > Roger Daisley wrote: > > >If you had two pairs of voltmeters and ammeters: > >I would think it would be great to put a pair between the controller and > >motor and the other pair between the controller and battery pack. > > > >If you have two voltmeters and one ammeter: > >Maybe place one voltmeter across the motor and one voltmeter across the > >pack. My guess is that the ammeter should register the motor draw. Right? > > > >If you have one voltmeter and one ammeter ... What now? Currently, (lol) > >mine are across the battery pack. Does this make the most sense? > > > >Roger > > > >"Where Revolutionary New Ideas May Not Be New Or Revolutionary" > > > > > > > > > >
