marka-ee
100 W
- Joined
- Mar 24, 2020
- Messages
- 173
I would like to up the voltage capability a bit on my 9 Fet KT controller. I see the 3 big caps that are 63 volts. Two of them are across the voltage input line, and the other I'm not certain what it is doing. I got some 100 volt caps of similar size but lower uf . I'm hoping that is not an issue, but if it is I can run more caps external to the case, right ?
There are some small caps that are 50 volts, I don't know if they need changing too.
Now to the Fets. Since this is a 9 fet unit, it is lopsided in that they put more but 'cheaper' fets on one side. If it was balanced it would be a 6 fet controller or a 12 fet controller. I don't know why they did a 9 fet. Maybe marketing reasons. So I will replace the 68 V 110 A fets in there with more of the 85V 150 A fets also in there, maybe making it a 6 fet controller as I see no reason for one side being different that the other. Does my plan seem OK ? I only want to run maybe 60 volts. I was running 52 before. Side note : I feed it from a dc dc boost converter, so I can dial in what voltage I desire. Yes , the DC DC is a bit wacky, but I got a good supply of 10S packs a while back, and it's my way of getting some more speed out of what I have, and I don't want to go to 72 volts. Would the 85 volts fets ( K150E09NE ) be ok at 60 volts, assuming voltage spikes and noise ? The controller is 500 watt and never got above slightly warm even on steep hills. I may shunt it to 600 watts.
There are some small caps that are 50 volts, I don't know if they need changing too.
Now to the Fets. Since this is a 9 fet unit, it is lopsided in that they put more but 'cheaper' fets on one side. If it was balanced it would be a 6 fet controller or a 12 fet controller. I don't know why they did a 9 fet. Maybe marketing reasons. So I will replace the 68 V 110 A fets in there with more of the 85V 150 A fets also in there, maybe making it a 6 fet controller as I see no reason for one side being different that the other. Does my plan seem OK ? I only want to run maybe 60 volts. I was running 52 before. Side note : I feed it from a dc dc boost converter, so I can dial in what voltage I desire. Yes , the DC DC is a bit wacky, but I got a good supply of 10S packs a while back, and it's my way of getting some more speed out of what I have, and I don't want to go to 72 volts. Would the 85 volts fets ( K150E09NE ) be ok at 60 volts, assuming voltage spikes and noise ? The controller is 500 watt and never got above slightly warm even on steep hills. I may shunt it to 600 watts.