DIY EV Part 55 - Another addition to the Shelf of Shame!

[@GapRecordingsNamibia]

Hi Ali...... Yes, something I thought about when I still had the Euno...... I designed a fuse into the pre-charge line thereby blowing the fuse if for one reason or another my main contacttor decided to go open.... This will save the resistor and let you know there is a main contacttor fault.... I understand you had a backfeed issue but, putting a fuse of a suitable rating after your pre-charge resistor will help prevent it from being toasted again.... This ev stuff is actually really simple to design, the problem is you need to think about A: multiple systems and then B: connecting and incorporating those systems while isolating the low side voltage from the high side voltage and there, this can become blurred leading you to miss such a fault as a back feed which you 99.5% of the time when dealing just with low side, would have caught almost instantly.... Steady as she goes..... You'll get it sorted, I'm just glad you did not become part of the negative statistics....

[@alibro7512]

You're right so I'll figure out a way to incorporate a fuse. I guess it''s like anything, If I were to do it all again I'd do many things differently. Maybe next time. 😋

[@GapRecordingsNamibia]

@@alibro7512 The reason I did the fuse thing was because I could not afford to fry my resistor..... Stuff is just unbelievably expensive out here that I could not risk it. Those high power fuses out here cost a couple of hundred bucks in my money, and, not every shop carries stock or even the correct values, so I did that out of necessity........ I envy you being where you are with access to what you have, hence, why I can only look and comment from my armchair position..... Plus.... I've heard people say hindsight is always 20/20....... But, if it were easy, then, everyone would be doing what you are doing...... And therein lies the difference....

[@alibro7512]

I think the main problem was, even though the fuse blew the car still operated normally. Until it didn't. The timer module was still operating normally and (glitching normally unfortunately) . A fuse on the resistor would have saved it and caused the car to cut out but without any harm to anything except the fuse. I've also put a 1500µF cap across it which seems to have cured the glitching and waiting for a delivery off 100nF ceramics to do add to it to be sure.

[@GapRecordingsNamibia]

Yes, the 1500mfd will most certainly help smooth out the supply but will also act as a resivour/ buffer, the ceramic will deal with any pulses or rf switching type noise... Very good call....

[@MrNhenwood]

Sounds like you probably should have a fuse on the pre-charge resistor too

[@alibro7512]

Sorry I hadn't properly understood your suggestion when I first read it. Yes that sounds sensible so I'll do that.