I purchased a Navitas 100-36 controller for my mountain bike conversion. It's rated at 30A continuous and 100A max. It has "current and thermal limiting the unit is fully protected".
Used for: 24V 650W Scott (3/4hp) Permenant Magnet DC Motor rated at 30A.
I don't know what my actual load is with a 10:1 ratio or with the 12.68:1 ratio that I plan on changing it to. (there are just too many variables, weight, temperature, friction, hills etc)
The Navitas controller fried the other day.
I emailed the retailer about it and they said that before they issue me an RMA# they need to know the specifics of my drive system.
I emailed back with the information and a general electrical and mechanical schematic of my system.
I'm not very happy with my original choice, I thought it would work well for this conversion. Perhaps I was wrong.
I'm looking at alternatives. If they warranty it fine, I'll baby it and hope it holds up but it sounds like no matter what, I'll eventually need to get another, higher amperage, controller. It's a bummer, the one above cost me $150.
Curtis and Alltrax controllers come to mind but I wonder why there are so many rebuilt Curtis's if they are so good. It probably has to do with using contacts which arc and deteriorate after repeated starts and stops.
I don't know anything about Alltrax other than some of you have them.
I looked at some Curtis and some Alltrax controllers but it looks like I would need to go to a 200A. They sure are spendy!
Any suggestions on a good controller that has a Great warranty? I want one that is definately not going to fry, hopefully it's not going to run me more than $175-$250.
Would something like this work with a 24V system?
Thanks for any info that might help.