Search found 235 matches

by francisco.shi
Sat, 30 Nov 2019, 16:18
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 507
Views: 35756

Re: Prelude conversion project - some questions

If it is overweight what can you do to make it pass?
by francisco.shi
Sun, 24 Nov 2019, 18:19
Forum: General EV Discussion
Topic: EV-Only "Fuel" Tax On The Govt Agenda
Replies: 20
Views: 453

Re: EV-Only "Fuel" Tax On The Govt Agenda

The tax will be more than the tyres. At 4c per km if a set of tyres lasts 30k km the tax would be $1200. A small car set of tyres is around $400.
by francisco.shi
Sun, 24 Nov 2019, 16:12
Forum: General EV Discussion
Topic: EV-Only "Fuel" Tax On The Govt Agenda
Replies: 20
Views: 453

Re: EV-Only "Fuel" Tax On The Govt Agenda

I think taxing tyres would be the easiest way to get a road use tax. It will be so difficult to ensure every car is done correctly. You can not use GPS unless you can ensure everyone will take the GPS with them at all times. And how about running underground? It would be too easy to block a GPS sign...
by francisco.shi
Mon, 18 Nov 2019, 12:08
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 507
Views: 35756

Re: Prelude conversion project - some questions

You mentioned a date with the engineer. Can you drive the car before you get the final inspection?
by francisco.shi
Fri, 15 Nov 2019, 10:28
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 507
Views: 35756

Re: Prelude conversion project - some questions

I think if you put a TX valve then a small evaporator that cools the battery coolant then the cabin evaporator it will work as long as you dont freeze the battery coolant and you do not have so much load from the battery coolant that the gas comes out warm from the first evaporator. How cold the cab...
by francisco.shi
Fri, 15 Nov 2019, 08:57
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 507
Views: 35756

Re: Prelude conversion project - some questions

I am going to face the same problem. I was thinking of using the evaporator to chill water that I can then run thru whatever I need to cool down. So all you need is a pump to pump the water to either the batteries or the evaporator in the cabin. Not sure if it will be better. Having an evaporator to...
by francisco.shi
Mon, 11 Nov 2019, 10:29
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 507
Views: 35756

Re: Prelude conversion project - some questions

I think there must be some capacitor that needs to be precharged. The master contactor should only switch under load in a fault condition.
Have you tried to put a precharge resistor and checked that it is not trying to switched into a discharged capacitor?
by francisco.shi
Fri, 08 Nov 2019, 07:15
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 507
Views: 35756

Re: Prelude conversion project - some questions

That is really good. That is 135wh/km which is almost the same as the factory made electric cars for that size.
by francisco.shi
Mon, 04 Nov 2019, 21:23
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 507
Views: 35756

Re: Prelude conversion project - some questions

How much power does it take to keep the car going on a flat at 100kph?
by francisco.shi
Wed, 16 Oct 2019, 03:21
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 73
Views: 4238

Re: Soyachips’ Electric FZR250

How much did it cost to make the part from 3Dhubs and how long did it take?
by francisco.shi
Sat, 05 Oct 2019, 17:55
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 73
Views: 4238

Re: Soyachips’ Electric FZR250

I much does the battery pack weigh?
by francisco.shi
Fri, 20 Sep 2019, 05:09
Forum: Batteries, charging, management and monitoring
Topic: E63 LG 63Ah NCM battery group buy
Replies: 32
Views: 2640

Re: E63 LG 63Ah NCM battery group buy

I put an 8x50mm short piece of copper that connects to the tabs on one end and the other side goes to a length of welding cable that goes to the load.
by francisco.shi
Thu, 19 Sep 2019, 04:43
Forum: General EV Discussion
Topic: AC 3 phase motor fee spinning
Replies: 10
Views: 486

Re: AC 3 phase motor fee spinning

If you have an induction motor you do not need to disconnect the motor. As long as there is no power on the stator windings it will freewheel no problems. As for the max speed induction motors are good in that once you run out of volts you can keep increasing the frequency and the motor will keep sp...
by francisco.shi
Wed, 18 Sep 2019, 21:11
Forum: Batteries, charging, management and monitoring
Topic: E63 LG 63Ah NCM battery group buy
Replies: 32
Views: 2640

Re: E63 LG 63Ah NCM battery group buy

The maximum I tried was 2C continuous for 30min. That was about 400A.
I didn't do a higher current because I didn't have a load that could handle it. The pack voltage was 40v.
by francisco.shi
Thu, 12 Sep 2019, 17:35
Forum: Renewable Energy and Storage (Non-EV)
Topic: Tesla PW2
Replies: 39
Views: 3077

Re: Tesla PW2

I am thinking more about straight solar inverters with no battery hardware.
So I assume when the solar panels are not generating any electricity would the bus drop until the mains start feeding back in?
by francisco.shi
Thu, 12 Sep 2019, 08:31
Forum: Renewable Energy and Storage (Non-EV)
Topic: Tesla PW2
Replies: 39
Views: 3077

Re: Tesla PW2

I have been giving this idea some extra serious though.
Does anyone know much about how the solar inverters work ?
What is the bus voltage to where the solar panels feed to?
Does anyone have a circuit diagram of the power electronics of a solar inverter?
Do all inverters use the same topology?
by francisco.shi
Wed, 04 Sep 2019, 03:58
Forum: Renewable Energy and Storage (Non-EV)
Topic: Tesla PW2
Replies: 39
Views: 3077

Re: Tesla PW2

The car connects to the house via the dc charging port. As far as I understand when charging the car connects the battery to the port and the external charger does all the work. As long as the car does not disconnect the battery when it sees power being taken out. You do not need a BMS for the car b...
by francisco.shi
Sun, 01 Sep 2019, 11:51
Forum: Renewable Energy and Storage (Non-EV)
Topic: Tesla PW2
Replies: 39
Views: 3077

Re: Tesla PW2

I was thinking more of an off grid system and use the car battery as backup for when it is cloudy for a few days.
You would still need a small storage battery.
by francisco.shi
Sat, 31 Aug 2019, 18:40
Forum: Renewable Energy and Storage (Non-EV)
Topic: Tesla PW2
Replies: 39
Views: 3077

Re: Tesla PW2

I have been thinking about how to do this. As you said most solar panel strings would be able to feed the car battery directly. And most solar inverters I assume would have a 400 or so volt bus. So it may be as simple as just connecting the car battery to the internal bus and reprogramming the inver...
by francisco.shi
Sat, 31 Aug 2019, 12:21
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 223
Views: 40196

Re: 4Springs' Brumby

I read it on a research paper. I am not sure if it was this one. https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.researchgate.net/publication/318816856_The_effect_of_external_compressive_loads_on_the_cycle_lifetime_of_lithium-ion_pouch_cells&ved=2ahUKEwjtnoiJoKzkAhULeCsKHWa-CO0QFjAB...
by francisco.shi
Sat, 31 Aug 2019, 12:13
Forum: Renewable Energy and Storage (Non-EV)
Topic: Tesla PW2
Replies: 39
Views: 3077

Re: Tesla PW2

Plan C would be to have two electric cars with 40kwh+ battery each and when supply is too low run off the car battery. When car is getting low you can go to a fast charger and recharge.
If you use say 12kwh/day your car batteries would keep you going for about a week.
by francisco.shi
Fri, 30 Aug 2019, 06:31
Forum: Renewable Energy and Storage (Non-EV)
Topic: Tesla PW2
Replies: 39
Views: 3077

Re: Tesla PW2

Or you could install enough backup and panels to run off grid and tell western power that you are moving and do not want the connection anymore.
It seems it is becoming easier to go off grid. It is just a matter of how much you get for your excess electricity vs how much you pay in connection fees.
by francisco.shi
Tue, 27 Aug 2019, 18:40
Forum: For Sale/Wanted
Topic: car hoist
Replies: 10
Views: 543

Re: car hoist

You can change the wiring from star to delta and will run at the same speed.
And if you put a vfd you can adjust how fast it goes up so you can get very accurate positioning.
So better start working on your explanations.
by francisco.shi
Tue, 27 Aug 2019, 14:43
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 507
Views: 35756

Re: Prelude conversion project - some questions

You are right about the increase in resolution. It is a very long time since I did uni.
The idea of keeping the old measurements was to make a low pass filter. I just not very good at explaining it.
by francisco.shi
Tue, 27 Aug 2019, 13:22
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 507
Views: 35756

Re: Prelude conversion project - some questions

Just a note on the averaging. You can increase the resolution of the ADC by adding the values and keeping a total. For example if you read the ADC 4 times you will be adding 2 bits to the ADC resolution. This is assuming you have some noise in your input which is higher than 1 bit. Then if you divid...