Need a switch between 36V & 48V for voltage meter

[blownZ71]

I have built a portable electric fan that I can use on any cart going through a voltage reducer. The voltage reducer works on both 36 and 48 volts with no modification. I have a voltage meter gauge that I was hoping I could just use the reduced 12V to the (C)common tab, but that did not work. So when I go to hook up to a 36 volt cart I use that particular wire lead, or use the separate 48 volt wire lead. Then I believe I need a SPDT switch which would essentially work as 36V-OFF-48V then going to the (C)common tab on the gauge. My questions are if I only used the 48V tab even on a 36V cart, I am assuming it would show 75% charge max? I cannot find what kind of ampere is associated with the voltage gauge to know whether I really need a 48V switch or if a standard 12V switch might work in this application. I have not been able to find a 48V switch that I believe will work.

Thanks for any help or input !!!

Originally Posted by blownZ71

I have built a portable electric fan that I can use on any cart going through a voltage reducer. The voltage reducer works on both 36 and 48 volts with no modification. I have a voltage meter gauge that I was hoping I could just use the reduced 12V to the (C)common tab, but that did not work. So when I go to hook up to a 36 volt cart I use that particular wire lead, or use the separate 48 volt wire lead. Then I believe I need a SPDT switch which would essentially work as 36V-OFF-48V then going to the (C)common tab on the gauge. My questions are if I only used the 48V tab even on a 36V cart, I am assuming it would show 75% charge max? I cannot find what kind of ampere is associated with the voltage gauge to know whether I really need a 48V switch or if a standard 12V switch might work in this application. I have not been able to find a 48V switch that I believe will work.

Thanks for any help or input !!!

you use a voltmeter to see your voltage
you use a reducer to get 12 v out of your pack

are you asking if you can have a meter and reducer to hook up to other carts ?

a 12v fan ?

[blownZ71]

Originally Posted by crash test dummy

you use a voltmeter to see your voltage
you use a reducer to get 12 v out of your pack

are you asking if you can have a meter and reducer to hook up to other carts ?

a 12v fan ?

This is correct, but for the voltage meter I need to be able to switch the common wire from 36V to 48V, depending on the cart. That is what I need help with.

[orangeman6]

Maybe I'm not understanding, but if you just need a voltage meter that can read up to 48 volts, see the one at the link below.


http://www.cartsunlimited.net/battery-meters.html

you would just put the reducer or meter in the cart you want
no switch needed
i don't see why

you just wire the fan to 12v plug

use quick connects to make it movable




what model reducer are you using ?

[blownZ71]

The voltage reducer I am using does not have a different setting for 36V vs 48V, it works for either and only has single a +- in and +- out. Otherwise your diagram is pretty close but the voltage meter I am using has a (C) common wire which would typically go to the key switch, but I need it to switch between 36v and 48v because I will be moving it between both style carts. I uploaded a diagram in my photo gallery on this forum but it will not let me link it because I am new here.

[rib33024]

This one

[blownZ71]

Yes thats it, Thanks

YEA ... that is if you have 2 power sources one 36v and one 48v on a SINGLE cart

HOW TO WIRE IT WITH AN ON/OFF SWITCH OR A KEY SWITCH