Re: Support for Evie cars
Posted: Thu Mar 07, 2013 11:52 am
The Curtis just measures the current flow and not the direction of flow. In reality its actually a very small amount of power that gets put back to the cells, but worse is that since the curtis is reading current and disregarding direction it continues to measure it as discharge, so just makes it worse.
I have asked Curtis about any options with this, and will post any response.
On the heater front one thing you could consider is a PWM controller for the heater, It would be a pain to incorporate in the existing controls, but not impossible. But it would need a heck of a power capability to control 2 to 4kw or whatever yours has. If I remember yours has a simple Metal housing and heating element, so you could just use a simple adjustable electronic thermostat and relayetc to make the temp of the small container adjustable from inside the car. RApid electronics do a simple educational circuit board Thermostat using a Thermister, I have used loads of these and they are very easy to modify. They do however need a decent 9 to 12v supply to function otherwise they drift a lot. Box etc in the engine bay, and simple 3 leads to a Pot under the dash.
I have spoken to Zivan about multiple chargers and in theory you could just connect two in parallel, as the BMS controls the voltage. But the charger isnt just a std Zivan but is modified to work in this way.
Higer top speed is difficult, you may be able to up the max RPM, but the torque of the motor goes downhill with RPM, so its not really an option. You could fit slightly larger wheels and tyres, so taking the gearing up a bit. All the gears are still in the box, but I dont think putting it in another gear is a good solution, as low speed and take off would be hampered.
Grumpy-b
I have asked Curtis about any options with this, and will post any response.
On the heater front one thing you could consider is a PWM controller for the heater, It would be a pain to incorporate in the existing controls, but not impossible. But it would need a heck of a power capability to control 2 to 4kw or whatever yours has. If I remember yours has a simple Metal housing and heating element, so you could just use a simple adjustable electronic thermostat and relayetc to make the temp of the small container adjustable from inside the car. RApid electronics do a simple educational circuit board Thermostat using a Thermister, I have used loads of these and they are very easy to modify. They do however need a decent 9 to 12v supply to function otherwise they drift a lot. Box etc in the engine bay, and simple 3 leads to a Pot under the dash.
I have spoken to Zivan about multiple chargers and in theory you could just connect two in parallel, as the BMS controls the voltage. But the charger isnt just a std Zivan but is modified to work in this way.
Higer top speed is difficult, you may be able to up the max RPM, but the torque of the motor goes downhill with RPM, so its not really an option. You could fit slightly larger wheels and tyres, so taking the gearing up a bit. All the gears are still in the box, but I dont think putting it in another gear is a good solution, as low speed and take off would be hampered.
Grumpy-b