Enginer PHEV best battery use to 70% to 80%

[whk.wang]

I have not yet added the Enginer Kit, and am waiting for it to arrive.

Question comes to mind. I am looking to extend the life of the battery as long as possible. I can take the battery down to empty or Beeping. But I really want to take it down the 70% SOC or 80% SOC.

So I am geting the 4Kwh system.
So I am trying to figure out how low to take that will be that level of SOC?

I was trying to figure out the math to calculate the time the Kit can be on.

I have a scan gauge that can help me keep track, if not exactly, but it can help to show me the time on for this trip.

So 3000W used from batteries.
The batteries are 40AH batteries at 48V.


I almost have all the pieces to do the calculation for minutes I can have the battery pack on before the Enginer kit runs to the desired SOC?

So the question is how much time with the pack last?
What will the Battery Voltange be for 70% SOC?
What will the Battery Voltange be for 80% SOC?

I am geting the 4Kw system.

Is this right?
3000W / 48 V = 62.5amps.


40 AH / 62.5 Amps * 60 minutes * 70 % = 26.88 minutes.
40 AH / 62.5 Amps * 60 minutes * 80 % = 30.72 minutes.

What am I missing...
So
Based on the addition by krousdb:
2500W / 51.2V = 48.828A Which is about the middle of what krousedb is predicting and absolute max.


80 AH / 48.828 Amps * 60 * 70% = 68.8 minutes
80 AH / 48.828 Amps * 60 * 80% = 78.6 minutes

[krousdb]

Originally Posted by whk.wang

I have not yet added the Enginer Kit, and am waiting for it to arrive.

Question comes to mind. I am looking to extend the life of the battery as long as possible. I can take the battery down to empty or Beeping. But I really want to take it down the 70% SOC or 80% SOC.

So I am geting the 4Kwh system.
So I am trying to figure out how low to take that will be that level of SOC?

I was trying to figure out the math to calculate the time the Kit can be on.

I have a scan gauge that can help me keep track, if not exactly, but it can help to show me the time on for this trip.

So 3000W used from batteries.
The batteries are 40AH batteries at 48V.


I almost have all the pieces to do the calculation for minutes I can have the battery pack on before the Enginer kit runs to the desired SOC?

So the question is how much time with the pack last?
What will the Battery Voltange be for 70% SOC?
What will the Battery Voltange be for 80% SOC?

I am geting the 4Kw system.

Is this right?
3000W / 48 V = 62.5amps.


40 AH / 62.5 Amps * 60 minutes * 70 % = 26.88 minutes.
40 AH / 62.5 Amps * 60 minutes * 80 % = 30.72 minutes.

What am I missing...

You are missing two things. First, 3000W is the maximum output. The average output for me is about 2000W. The second missing item is the efficiency of the converter, which is about 90%. To have an output of 2000W, you need an input of 2200W. The nominal voltage of the pack is 51.2. So...

2200W/51.2V = 41.0A

But a 4kWh kit, you have two strings of 40Ah cells, 80Ah total. With a 70% DoD, you have 56Ah. With a 80% DoD, you have 64Ah to use. So...

64Ah/41A = 1.56h
56Ah/41A = 1.37h

[karaoke-rockstar]

Many of us are waiting to hear from you after installation and the real world data you can provide us with. I'm hopeful, but a little skeptical of Enginers claims. I hope to be proved wrong so please keep us informed on the actual ev range that can be expected.
Thanks Gene

[whk.wang]

So interesting a run with only 10 minutes difference to use up 10% more power from the batteries to go from 70% to 80% of charge.

So even more interesting if I drive 32 miles my commute which takes about 35 - 50 minutes so most of the time my travel will be easily under 70% discharge.

And the plan is to be able to recharge at work and at home.

I bet I could be a candidate for 8kw and the 2 converters. Or even 6kw and 2 converters. And still not abuse the batteries.

Originally Posted by krousdb

You are missing two things. First, 3000W is the maximum output. The average output for me is about 2000W. The second missing item is the efficiency of the converter, which is about 90%. To have an output of 2000W, you need an input of 2200W. The nominal voltage of the pack is 51.2. So...

2200W/51.2V = 41.0A

But a 4kWh kit, you have two strings of 40Ah cells, 80Ah total. With a 70% DoD, you have 56Ah. With a 80% DoD, you have 64Ah to use. So...

64Ah/41A = 1.56h
56Ah/41A = 1.37h

[whk.wang]

I am not looking to over expect. I am expecting to save between 10% and 20% which is 10-20 MPG. But I do expect to get a little more EV range. Which should equate from what I used to get of 1 mile or less, to 3-5 miles with stop lights, and that may get me to the grocery store and home all electric. Which can be a great thing on savings for the short trips.

I expect to post what I end up with in the other thread, but am trying to do the calculations here since I have nothing better to do while waiting for my kit to arrive.

[MJFrog]

Originally Posted by whk.wang

I am not looking to over expect. I am expecting to save between 10% and 20% which is 10-20 MPG. But I do expect to get a little more EV range. Which should equate from what I used to get of 1 mile or less, to 3-5 miles with stop lights, and that may get me to the grocery store and home all electric. Which can be a great thing on savings for the short trips.

I expect to post what I end up with in the other thread, but am trying to do the calculations here since I have nothing better to do while waiting for my kit to arrive.

With only a single converter, I was not able to get more than about 1 1/4 miles in EV mode on a cold engine before dropping out. The fact is, the Enginer pack cannot keep the Prius pack charged quickly enough to run pure EV mode for any distance. Two converters would have a better chance, but I don't have a second one.

The idea of using it as a NEV is a no-go with just one converter.

[whk.wang]

I understand that, but if you cruz, and have stoplights, the enginer kit does recharge at each light and yes, it is a falling proposition, that the Enginer kit with one converter can't keep up. But it should get me farther then before. Also if I can already almost get all the way to the store now or even get to the store, I just can't get all the way home all electric also. So this will be helpful. The pain of having too many stoplights and too many stop signs but I do see a light at the end of the tunnel for EV mode now...

Originally Posted by MJFrog

With only a single converter, I was not able to get more than about 1 1/4 miles in EV mode on a cold engine before dropping out. The fact is, the Enginer pack cannot keep the Prius pack charged quickly enough to run pure EV mode for any distance. Two converters would have a better chance, but I don't have a second one.

The idea of using it as a NEV is a no-go with just one converter.

[miscrms]

It might be a good idea to look into some of the battery monitor products marketed toward EV builders. Here is one example:

Electric Vehicle e-meter, monitor, volts meter, amps meter, battery monitor

This one is pretty slick looking, but I believe there are simpler ones out there that don't need a screen. They would likely just give you an Ah or Wh reading on an lcd display, but that would give you a much better idea of how much of your battery you have actually used. Here is another one I have always liked the looks of, although from the website I am not 100% sure if they calculate SOC solely based off voltage or it they integrate the current data.

PakTrakr Multi Battery Monitor Battery Pack Monitor

This is one of the areas of concern I do still have with this kit, I don't feel like enough is done to prevent over discharge of the pack which could result in a much shorter than expected lifespan. It doesn't seem like it should be that tricky or expensive to make it better in this regard.

Rob

[atfsi]

I'm adding a Watt's Up to a 4KWh kit when it gets here...


http://www.powerwerx.com/tools-meter...dc-inline.html

only $59 and will do the integrations....I have one on my e-bike...

[mrbigh]

Originally Posted by miscrms

It might be a good idea to look into some of the battery monitor products marketed toward EV builders. Here is one example:

Electric Vehicle e-meter, monitor, volts meter, amps meter, battery monitor

This one is pretty slick looking, but I believe there are simpler ones out there that don't need a screen. They would likely just give you an Ah or Wh reading on an lcd display, but that would give you a much better idea of how much of your battery you have actually used. Here is another one I have always liked the looks of, although from the website I am not 100% sure if they calculate SOC solely based off voltage or it they integrate the current data.

PakTrakr Multi Battery Monitor Battery Pack Monitor


Rob

Sorry but the "Blue window" is a dedicated EV instrumentation and almost a waste to use in an Hybrid vehicle like a Prius
-First it requires and NTSC resolution monitor, like the old type Video display, and really looks cheesy.
-The total voltage readout need to be programed by the factory at time of sale. (Field upgradeable with an extra up loader kit, + $$$)
-For Amp count it need an external "Shunt" in line for Coulomb arithmetics .
This instrument doesn't read CAN information through OBDII connections, so for RPM counting you need to install a Hall effect sensor to a rotating shaft somewhere (is it really necessary on a Prius?) and if you want temperature ??????
The next item of the same shortcut page, the XANTREX X10 (formely E-meter), doesn't work with the Prius neither, I tried it 5 years ago and sitting in a shelf somewhere in the work shop.
The Pak-trakr could be adecuated only for battery monitoring factors but you need a display unit for each 48V strings.

Originally Posted by miscrms

This is one of the areas of concern I do still have with this kit, I don't feel like enough is done to prevent over discharge of the pack which could result in a much shorter than expected lifespan. It doesn't seem like it should be that tricky or expensive to make it better in this regard.

and still we are coming back to the beginning of the circle, this equipment is based on a working old design by other pioneers and reflects the "LOWER PRICE" that everyone is expending; that it can be improved and made with more reliable merchandise, 100% correct. But at what cost.............
I bet you that Jack, the Enginer.co rep never had in account the large quantity of failed returned merchandise and the expenses involved to today days.
Of course, it is still in beta testing or...... it is "delta" testing now????