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Purpose of Solenoid resistor?

Purpose of Solenoid resistor?

Postby gkelly » Sat Dec 13, 2008 12:28 pm

Can anyone tell me what the purpose of the solenoid resistor is? I have a 2003 EZGO that I upgraded to 48v with 400amp controller, lift kit, etc. It quit running, and found that I had a bad battery in the middle of the pack. I took that battery out of the chain and it is now working and running with 42v until I get get to town for another battery. However, while checking out everything else, I noticed that the 250 OHM resistor on the solenoid had rusted and broken off on one side, so I removed it. The cart is running fine without it, but don't want to damage cart if I need to replace it. Could use some info from the experts.
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Postby tjdadj » Sat Dec 13, 2008 1:38 pm

The resistor is used by SOME controller manufacturers to pre-charge the storage capacitors in the controller. This eliminates the lag (low drive current condition) experienced when punching the accelerator.

If you have an Alltrax controller, the 250 ohm resistor is wrong for a 48V system. It should be a 470 ohm 10W resistor instead.

If you look on Alltrax's website, in "Document Depot" there is a pdf that explains the who, whats, and whys..

'95 DCS Medalist [4" lift, 20" tires, Alltrax DCX 400, 48v conversion, and solar charged]

'91 Geo Metro Convertible Electric conversion [Work in Progress]
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Postby GamblinGolfer » Sat Dec 13, 2008 7:04 pm


12V-36V system gets a 250 Ohm 10W Resistor.

48V system gets a 470 Ohm 10W Resistor.

Stock solenoids 70-100Amp get a 1A current Diode 1N4004

Solenoids 200A and up get a 3A current Diode 1N5408
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