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by Gary12345
Mon Oct 07, 2019 2:18 am
Forum: General / Main Owners Forum
Topic: Turtle at Half Charge Under Load?!?!?!
Replies: 18
Views: 1381

Re: Turtle at Half Charge Under Load?!?!?!

Style wrote:Having same issue. OP-What was the resolution to the issue ?


This is generally caused by a battery cell going bad. Turtle is triggered by low voltage on a battery so even though the car has plenty of charge, one cell's voltage drops when it is used.

What country are you located?

Thanks.
by Gary12345
Thu Sep 26, 2019 2:12 am
Forum: Batteries and Battery Management
Topic: The aftermarket cell replacement saga
Replies: 11
Views: 815

Re: The aftermarket cell replacement saga

These look familiar !!!!!

https://www.aliexpress.com/item/32888613944.html
Unfortunately the reviews say they are 40Ah version (LEV40).... damn it !

These are a good size and rating, unfortunately fairly expensive.
https://www.aliexpress.com/item/32906459897.html

Cheers all, keep up the good work.
by Gary12345
Thu Sep 26, 2019 1:59 am
Forum: Batteries and Battery Management
Topic: The aftermarket cell replacement saga
Replies: 11
Views: 815

Re: The aftermarket cell replacement saga

It is difficult to know whether these new cells are good or not, whether they are well made. I am always suspicious of the capacity rating, i've seen too many 18650 cells with "9800mah" which is impossible. These cells are within the size of the originals, https://www.aliexpress.com/item/4...
by Gary12345
Tue Sep 24, 2019 4:08 am
Forum: EVSE (Charging Stations)
Topic: I would like to set the charge current lower than 5A
Replies: 11
Views: 329

Re: I would like to set the charge current lower than 5A

Hi there ! The charger will just not run at such low amps and it is very inefficient. There is a 600w overhead during charging, this is from running the electronics, voltage conversion, water cooling pump, monitoring and balancing inside the battery, etc. That means at 240v approx 2.5A is used by th...
by Gary12345
Tue Sep 24, 2019 3:28 am
Forum: Batteries and Battery Management
Topic: The aftermarket cell replacement saga
Replies: 11
Views: 815

Re: The aftermarket cell replacement saga

Hi there, fascinating work. I would say that the spray foam will not help with cooling so would be better to pack it with some blocks to hold it in place but allow air around it. Of course time/necessity often doesnt allow perfect repairs and it did the job. I've done the LTC voltage monitoring chip...
by Gary12345
Thu Sep 19, 2019 8:04 am
Forum: Batteries and Battery Management
Topic: Using a second pack in parallel
Replies: 11
Views: 563

Re: Using a second pack in parallel

Its a lot of complex work to have a trailer like that RAV4 one. What I have considered a couple of times is how much power is consumed on the 12v side during a full discharge. What would be fairly easy would be separating the 12v system so that the dc-dc converter does not top up the 12v battery dur...
by Gary12345
Tue Sep 17, 2019 5:44 am
Forum: Batteries and Battery Management
Topic: Using a second pack in parallel
Replies: 11
Views: 563

Re: Using a second pack in parallel

Hi there, Good to hear you have some previous experience, I worry a bit when I read a question like that ! Even using an Anderson SB with a cover you can't really consider that safe to be powered up when not in use - the only safe way I can see this working is to install a contactor box in the car a...
by Gary12345
Mon Sep 16, 2019 7:21 am
Forum: Batteries and Battery Management
Topic: Using a second pack in parallel
Replies: 11
Views: 563

Re: Using a second pack in parallel

You need to be incredibly careful.... we are talking 50Kw at 400v... You'd need to be sure that your connectors were extremely secure and cope with the power without getting hot, water ingress is also a factor due to rain. There is also the issue that when you are not using your range extending trai...
by Gary12345
Fri Aug 30, 2019 7:41 am
Forum: Private For Sale, Want To Buy
Topic: Need to purchase obc unit for 2012 i-miev
Replies: 5
Views: 273

Re: Need to purchase obc unit for 2012 i-miev

Hi there, Have you investigated what has failed inside the charger? Often its possible to repair them. Not always as I know of one that actually burned a hole in a circuit board but often its repairable. Im in the UK and it looks like failed chargers will beat failed cells in being the part that rea...
by Gary12345
Thu Aug 22, 2019 7:34 am
Forum: Private For Sale, Want To Buy
Topic: Used On-Board Chargers for sale in Japan
Replies: 1
Views: 1102

Re: Used On-Board Chargers for sale in Japan

What is interesting is that the charger/dc-dc units are all flat topped versions, even the one that says 2015. Here in the UK 2009 and 2010 chargers were flat topped, after that they had an additional smaller box on the top.

Maybe they were always flat topped in Japan?

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