As you know...your Sabvoton is toast.shortcircuit911 wrote: ↑Oct 28 2018 1:09pmWell, I went for a ride on the trails by my house and it was pretty damn fun, that is until I fried my sabvoton. Did some trail riding, then ripped down the road for a few miles, then started doing some hard pulls. When going back to get my gopro I was pulling like 1-2kw then the bike just shut off, and wouldn't turn back on. Been trying to diagnose the issue with no luck, Electric God here on ES thinks it might be blown FETs. I'm going to send him my controller and see what he finds.
Pretty pissed with Sabvoton, no manuals or support, and a controller that can't push 100A reliably. I honestly just want to buy another controller. It is tempting to buy another sabvoton (200A model), but that would be a huge bummer if it crapped out on me. I don't want to spend more than $300-350 (less if possible) so I'm looking at options like the kelly kls7240s. I was looking at addapto, but am not sure how reliable those are as well. The search continues, just sucks that the bike is down until I throw more money at it . The ride was fun though.
I took it apart, found a blown transistor in the LCD and a bunch of blown mosfets. The filter capacitors in these controllers are horrifically inadequate. Not only are they cheap, but there is about 3-4X less capacitance than what is needed for a 24 fet controller. There needs to be about 15-18,000uF of capacitance and this controller has 4000uF on the power buss. I'm fairly sure this is the root cause for the controller failure. The mosfets are low grade Chinese parts. When Sabvoton was still around, they were doing a far better job at maintaining quality. Now that Sabvoton has closed it's doors in 2015 any new controller you find anywhere are very likely to be one of these knock-off, low grade clones. I have a legit Sabvoton made in 2014 and it is a far better product than what yours is. The quality in the clones is seriously inferior to the legit controllers.
This controller is not worth repairing. I'd have to replace all the mosfets and use much larger value capacitors. It would cost about $170 for the parts. Who knows if it would run after that.
For anybody else looking to buy a Sabvoton, just don't...the clones are garbage.