Enginer Plan B

[Flaninacupboard]

No it has no DC converter, it's not required.

[Simtronic]

Originally Posted by Flaninacupboard

Yeah we have 80A at 48V, they have 100A+ at 220V. The Headway cells look really impressive.

I was refering to amp hours and 80ah is more than the 16ah I believe the Headway's are. 100Amps maybe what they can put out in terms of current supply and the RFE's are 150Amps or 160A which would be 2c. 80ah x 48V = 3840KWh verses 16Ah x 220v = 3520Kwh
the difference is the inverter losses from the lower voltage in the Enginer kit.
Out of interest how many cells are in the other kit?

[Flying White Dutchman]

Originally Posted by Simtronic

I don't think it is so much the cells, it is the arrangement and number of them. That said I wish I could get / afford around 80 x A123 20ah pouches. I don't know much about the headway cell kit but it's inverter has much less to do if it actually has one.

you now anyone already teste the amps c rating on the a123 shopping bags?

Originally Posted by f16bmathis

Mine shorted the Positive out to the case! Makes for a wierd dash display - I think the Prius hates it. Anyways, I opened it up (Enginers suggestion) and found the Negative wire was barely soldered in! Actually, it was soldered, but not actually connected to the board. It had a "bubble" of solder that kept it in the hole, but you could rotate it around.

It had heated up during use and probably melted / burnt the board and caused the short on the Positive side. I only say this because the short would go away when you flexed the board in that area.

I sent it back about three weeks ago and just got it back (or a replacement) and it works great!

I did take pictures of the inside, if anyone wants, replay back and I will post. Its not that exciting. Transistors mounted on both sides (thats why the screws are along the outside edges).

You can actually open yours, if its like mine, by pulling the two TOP screws on BOTH ends and lifting the lid up.

love to see pics

[cproaudio]

Originally Posted by Simtronic

...80ah x 48V = 3840KWh verses 16Ah x 220v = 3520Kwh...

Each LiFePo4 cells are 3.3v There are 16S on the Enginer kit at 80AH. That's 3.3vX16sX80ah=4224wh. Plugin Supply uses 76 16ah cells. 3.3vX76sX16ah=4012.8wh. If the Enginer converter is 90% efficient then the output to the HV battery would be 3801.6wh at 100%DOD. The headway cells' C rating is 3C continuous. PiS kit can supply 48 amps continuous while the best Enginer can supply is 17 amps continuous. I'm sure PiS can supply more than 100 amps if the demand is required.

[Simtronic]

Originally Posted by cproaudio

Each LiFePo4 cells are 3.3v There are 16S on the Enginer kit at 80AH. That's 3.3vX16sX80ah=4224wh. Plugin Supply uses 76 16ah cells. 3.3vX76sX16ah=4012.8wh. If the Enginer converter is 90% efficient then the output to the HV battery would be 3801.6wh at 100%DOD. The headway cells' C rating is 3C continuous. PiS kit can supply 48 amps continuous while the best Enginer can supply is 17 amps continuous. I'm sure PiS can supply more than 100 amps if the demand is required.

Thank you for clarifying that for me, seems the PIS kit is a better strategy, I wonder if they are available in the UK and how much they would cost

[Mesuge]

Originally Posted by dan2l

It appears that Fountainhead is the original company that made all the systems with poor Quality. Enginer reports no current relationship with Fountainhead and says that Fountainhead is violating Intellectual property agreements.

I expect that these kits and parts may be spares and refurbished parts that were left over or returned as warranty returns. The Chinese tend to try to resell thing that should be scrapped.

Be very careful if you deal with these guys.

Thanks,
Dan

Hm, so there must be a some source for the early Hymotion kit, which was DC booster based system, then first gen Enginer (aka Fountainsmell DC inverter), and recently the new supplier. And that's certainly not all. Evidently someone somewhere must have these DC converters ready in relatively good quality, but used in completely different field, so it's still under our radar.

I think this simple DC booster system is still valid option as mpg enhancer with general application to various hybrids from different OEMs (not full spec tailored and much more expensive PHEV solution). So, speaking of that great developments in BMS+ A123 pouch batt. thread in this forum, I'm however kind of hesitant to believe that A123 won't sooner or later plug this leak of their batteries onto wider diy market, be it Axy or Byz grade quality with crippled connector pads.. They have done it before, yes they are evil. And cylindricals (Headway, other brands too expensive) are waste of money, the longevity in harsh automotive environment is rather poor for this design/manuf. quality, these cells are only great for short term demo/racing projects.

Better approach seem to use the most field tested batteries out there, which are CALB/Winston so far.

Perhaps one route could be to gather few interested people in a group buy fashion and commision new design of such quality booster (&compact, smart,..), if possible with some scalable voltage output, i.e. not exclusive to Toyota HSD only.

There are many opensource projects like the recent OpenRevolt DC controller or 10kW EV charger which seem to demonstrate such capability to bring it finally into market as parts kit or preassembled unit etc.
(For those who might see it as rip off, Jack can be awarded via some "mandatory" small donation from the price per each final product shipped, as appreciation for popularizing this approach.)

Peak into the Enginer DC-DC and tweaking voltage/amps, passive cooling and ducts for the converter covered here: Custom Enginer 5kW 800 miles tank