Search found 56 matches

by francisco.shi
Sun, 09 Dec 2018, 08:34
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 101
Views: 6513

Re: Prelude conversion project - some questions

Is the potting compound only on the bottom of the cells?
by francisco.shi
Wed, 05 Dec 2018, 16:10
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 101
Views: 6513

Re: Prelude conversion project - some questions

Where did you get the data from. I would like to read a bit more about what other tests they did.
by francisco.shi
Wed, 05 Dec 2018, 12:33
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 101
Views: 6513

Re: Prelude conversion project - some questions

Have you done any measurements on the cooling system for the battery pack?
by francisco.shi
Mon, 03 Dec 2018, 04:52
Forum: General EV Discussion
Topic: Preparing the grid for EVs
Replies: 4
Views: 246

Re: Preparing the grid for EVs

This is true. We have a 1Mw transformer at work to supply the factory and a 1500m2 roof. But the power we use is not continuous. If we went and put solar panels on the entire roof we could feed 250kw of solar power to the grid without having to upgrade any part of the network or have 5 fast chargers...
by francisco.shi
Sat, 01 Dec 2018, 07:53
Forum: Renewable Energy and Storage (Non-EV)
Topic: Low Cost BMS for Home Storage Batteries
Replies: 26
Views: 1860

Re: Low Cost BMS for Home Storage Batteries

How big are the capacitors?
Do you have a circuit of how the capacitors are switched?
by francisco.shi
Sat, 01 Dec 2018, 05:33
Forum: Renewable Energy and Storage (Non-EV)
Topic: Low Cost BMS for Home Storage Batteries
Replies: 26
Views: 1860

Re: Low Cost BMS for Home Storage Batteries

That is what I was going to do for my BMS but I still don't know how much current to bleed off. I was going to aim at 10A per cell and I will balance during charge and discharge instead of waiting until one cell is fully charged before starting the balancing process. The main reason is that during d...
by francisco.shi
Sat, 01 Dec 2018, 04:18
Forum: Renewable Energy and Storage (Non-EV)
Topic: Low Cost BMS for Home Storage Batteries
Replies: 26
Views: 1860

Re: Low Cost BMS for Home Storage Batteries

Are there any balancing circuits with a dc-dc converters instead of resistors that transfers the energy to the other cells?
by francisco.shi
Fri, 30 Nov 2018, 17:01
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

Thank you for listening to my talk at the meeting. I have been a little busy so I did not have time to upload pictures. Here are some picture updates. These are pictures of the load resistor that I used for the 2C test. The resistance is 0.8Ohms It is made of packing steel belt and immersed in runni...
by francisco.shi
Fri, 30 Nov 2018, 13:08
Forum: General EV Discussion
Topic: Assembling a team to develop an EV platform in Brisbane
Replies: 3
Views: 171

Re: Assembling a team to develop an EV platform in Brisbane

I am working on a similar project but I am not building the motors from scratch. The biggest problem making the motors is that it is very difficult to make them for the right price. For example you can buy a 3ph 3kw induction motor from China for under $200 but you couldn't make just the stator for ...
by francisco.shi
Wed, 28 Nov 2018, 05:59
Forum: Other
Topic: When someone asks "But show me an EV that can tow a boat to Broome!" Show them this...
Replies: 8
Views: 359

Re: When someone asks "But show me an EV that can tow a boat to Broome!" Show them this...

A Tesla or even an outlander with a boat trailer with 150kwh of batteries under the boat will probably do it. And it will also depend on where you are driving from.
As for the electric truck with a kerb weight 2670kg sounds a bit light. Even with Tesla batteries 180kwh will be 1100kg of batteries.
by francisco.shi
Mon, 19 Nov 2018, 15:58
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

I just finished doing another 2C test. This time I managed to keep the test going until the pack was discharged. The results are as follows: Test current 400A Initial cell temperature 27°C (weather is getting hot 😦) Initial water temperature 25°C End water temperature 28.6°C (I had to change the wat...
by francisco.shi
Mon, 19 Nov 2018, 05:41
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

I have been trying to do some high current testing of the battery module but I have been having some problems with the connections to the cells overheating. I am very confident it is the cell connections because when I turn the load off the connections cool down very quickly and when I turn the cool...
by francisco.shi
Mon, 19 Nov 2018, 04:58
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 101
Views: 6513

Re: Prelude conversion project - some questions

How much does the brick weigh and how many kwh do you have per brick?
by francisco.shi
Thu, 15 Nov 2018, 07:39
Forum: Batteries, charging, management and monitoring
Topic: Cell compression?
Replies: 7
Views: 299

Re: Cell compression?

I remember reading somewhere that they were using 10psi of pressure which sounds more reasonable.
by francisco.shi
Wed, 14 Nov 2018, 23:15
Forum: Batteries, charging, management and monitoring
Topic: Cell compression?
Replies: 7
Views: 299

Re: Cell compression?

And I was worried I was compressing my cells too much. I applied enough pressure to bring the cell to the thickness specified in the specs. But I think the force I am applying is nowhere near what they say is optimum.
by francisco.shi
Mon, 12 Nov 2018, 21:48
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

I run the 2C test today and the results were as follows: Output current 380A Starting water temperature 24.5°C Starting pack temperature 27°C Test run for 10min. Could not run longer because output cable started to overheat. (Smoke started to come out) Cell temperature after 10min was 35°C water tem...
by francisco.shi
Sat, 10 Nov 2018, 20:09
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

I run a cooling system test yesterday. The test was designed to see how effective the cooling system was at coupling the coolant and the cells. I run the pack at 220A (1.16C the battery is 189Ah) until fully discharged. The cooling system did not have a radiator. It just had a bucket of water (about...
by francisco.shi
Thu, 08 Nov 2018, 10:08
Forum: General EV Discussion
Topic: All about the money :)
Replies: 13
Views: 374

Re: All about the money :)

Where are you?
by francisco.shi
Thu, 08 Nov 2018, 10:04
Forum: Mitsubishi
Topic: Outlander power consumption.
Replies: 2
Views: 130

Outlander power consumption.

I am working on an electric Pajero and I am trying to get an idea of how big a battery I will need. I have no idea how much power it will take to keep the car moving. So I guess the outlander will be as close as I am going to get to a Pajero. Does anyone with an outlander know how many kw it takes t...
by francisco.shi
Wed, 07 Nov 2018, 10:28
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 101
Views: 6513

Re: Prelude conversion project - some questions

Putty you are not in Brisbane. We could use the same test load. I worked out I need about 4m of packing steel belt to make my 35kw load. So i will just wind it in some wood former and inmerse it in a tank of flowing water.
by francisco.shi
Wed, 07 Nov 2018, 06:49
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

I need to run at the maximum the cell is rated, run water thru the cooling system and check battery temp and get some data for the efficiency of the cooling system . So potentially it may run for 12min if the cooling system is really good.
by francisco.shi
Wed, 07 Nov 2018, 06:17
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

It will be only for a few seconds. The 5C will only be drawn under heavy acceleration which should only last a few seconds. The original engine can produce 147kw. That would equate to 2C and it would accelerate 0 to 100kph in 15sec. So at 5C it would take 6sec. So unless it was accelerating really h...
by francisco.shi
Wed, 07 Nov 2018, 05:22
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

During normal operation I think will only be around 2C. But the motors will be capable of drawing 10C. And another reason for testing at 5C is I want to get some figures of how efficient the cooling system is. The cells are rated at 5C so I will be limiting the maximum output to what the batteries c...
by francisco.shi
Tue, 06 Nov 2018, 16:54
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

Sorry. I did not specify the currents correctly. The pouches are 63Ah but there are 3 in parallel. So 5C will be 945A
The segment I have assembled for testing is 10S3P. The expected capacity is 6.993kwh hence the 35kw load. So I do not think the mig wire will work even if it is under water.
by francisco.shi
Tue, 06 Nov 2018, 13:39
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 61
Views: 2302

Re: Francisco's Electric Pajero

I am currently charging the battery so I can do a capacity test. I assume a 63Ah cell should be able to push 63A for 1hr from fully charged to fully discharged? After the capacity test I want to run a 5C discharge test and test the cooling system. I still don't know what to use as a load. I will nee...