PHEV mod under way, Bristol, UK.

[ken1784]

Originally Posted by Flying White Dutchman

so bottomline to your "238b means nothing" if you set the charger to 238volt max is not that simple?

I think you're correct.

Ken@Japan

[Flying White Dutchman]

but with a temp sensor and a low 4amps charging it will be OK!

temp sensor to privent overheating and 4amps wil not mean a lot.

[ken1784]

What is your target SOC %?
Is it 80%? Or 90?. Or maybe 100%?
Anyway, I'm suggesting to watch the SOC to extend the cycle life.
If you don't care about the cycle life, please go ahead. I don't mind.

Ken@Japan

[Flying White Dutchman]

its 80-85%

[ken1784]

How are you going to detect the 80-85% SOC?

Ken@Japan

[Flying White Dutchman]

well i dont want to start a discussion about it in this ami plug topic!

but if you read a little bit about the prius battery you now that it wil use the donut sensor and voltage reading to see what real SOC the battery is in.

the voltage line between 20% and 80% soc is really flat ( only a small decline when discharging ) and when you go above 85% it will go up faster
and below 15% it wil drop faster then inbetween 20-80%

but did you read the link i send you?

maybe open en new topic or do this by PM
and leave this topic for ami's plugin project.

[dmckinstry]

Originally Posted by Flying White Dutchman

but with a temp sensor and a low 4amps charging it will be OK!

temp sensor to privent overheating and 4amps wil not mean a lot.

And in my case, 3 parallel packs are only getting 1 and 1/3 amp each, and it drops down to almost nothing by the time it reaches "full" charge.

Figuring SOC% is tricky and I don't know all the details, but the current sensor is measuring total current, not current to each of the parallel packs. Apparently (and I'm just saying this from memory) battery voltage is an indicator of SOC after getting above the "flat" part on the curve.

I've gotten my information from Norm, but don't blame him if I'm wrong. I could be wrong because I don't remember accurately.

BTW, I'm away from home for the next week and a half but when I get home, I'll have a scanner and can post the modified C7 curve used for my charger.


Dave M.

[aminorjourney]

Wow. I leave the thread for a few days and...

It's an interesting point to make - SOC vs Voltage. Of course, there's a big variation dependent on charging current. My experience says that the more current you try to put in to a battery the quicker the voltage rises- not necessarily the SOC.

Anyway. To answer everyone's questions. I'm looking at a terminal voltage of 238V because I believe that should equate to an approximate SOC of 85%.

After some further consultation I've placed and paid for:

an NG3, set to a maximum current of 4A and an EOC voltage of 238V. I have decided to not use a PWM interface and have settled for the SX curve. The aim I shall have will be to have both a temperature and voltage cut off.

Please forgive me if I take a little longer to repsond at the moment. I've got some health issues rearing its ugly head which is leaving me a little short of energy and full of pain.

Anyway - I'll let you know how the charger gets on when it shows up!

Nikki.

[Flying White Dutchman]

when did you pay for you charger?
because it was in stock and maybe now its no longer
so maybe now i have to wait 6 weeks because you beat me to it

[dmckinstry]

Originally Posted by Flying White Dutchman

when did you pay for you charger?
because it was in stock and maybe now its no longer
so maybe now i have to wait 6 weeks because you beat me to it

I paid for mine when I picked it up on Monday. I have been communicating with ElCon for at least 4 or 5 weeks though. And I'm not sure if they had more than one NG3 in stock.

Dave M.