- Cor, You cannot get rid of coil 3 because you would short circuit
Pack A when charging, same for coil 4 would short circuit pack B when
charging.
- Ohh yes, this is just an illustrative schem. Sure; giving some
extra Seconds delay to the 'ignition relay cut off' circuitry by putting a
4700uf cap or similar solution when you just finish charging and immediately
turn the EV in order to you be sure the coil 1 is totally open.
- Complete agree; fuses are elementary part of a high power high
voltage system, I just forgot them in this schem.
In my opinion I think this wiring could be more complex than most
common EV wirings, but if you consider the time saved due to the charger
capability of speed up the charge process over time. It would cost you once
(the wiring and extra components) but it will save you a considerably
charging time every day of the EV lifetime. I think that is one of the
biggest EV concerns, right?
Ing. Marco Gaxiola
CEO/Director
Juarez #18, Col. Bachoco
Tel: +52(662)301.1070
Cel: +521(662)169.0140
Skype: info.energyev
www.energyev.com
-----Mensaje original-----
De: EV [mailto:[email protected]] En nombre de Cor van de Water via
EV
Enviado el: jueves, 26 de marzo de 2015 03:18 p.m.
Para: Electric Vehicle Discussion List
Asunto: Re: [EVDL] charging two parallel packs in series
Actually - whether they will charge at a high rate of charging when
connected in parallel again, depends on their internal resistance and the
voltage difference.
Many people have attempted to balance-charge by connecting all
cells/batteries in parallel without getting a perfect balance, due to the
small difference in voltage and resulting low current.
For example, I have a pack consisting out of golf cart batteries for 120V
(20 x 6V) When I draw 300A then the pack sags up to 30V down, so internal
resistance is just under 0.1 Ohm.
If I charge them in series and I would connect them in parallel when there
is 1V difference between the two halves, there will be a equalization
current of about 10A.
Of course, with some chemistries the current can be (much) higher, but it is
hard to get an overwhelming fault current.
Regarding the picture:
- you could get rid of either coil2 or coil3 without problem for the EV
system.
- you need to make sure that both the remaining coil3 or coil2 and coil4 are
open before closing coil1 or you are short-circuiting a half pack.
- it would be best to have a fuse in line with each pack, just in case there
is a switching error
Is this added complexity really the best answer to the savings on the
charger current?
Cor van de Water
Chief Scientist
Proxim Wireless
office +1 408 383 7626 Skype: cor_van_de_water
XoIP +31 87 784 1130 private: cvandewater.info
www.proxim.com
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-----Original Message-----
From: EV [mailto:[email protected]] On Behalf Of Michael Kadie via
EV
Sent: Thursday, March 26, 2015 10:46 AM
To: Steve Clunn; [email protected]
Subject: Re: [EVDL] charging two parallel packs in series
So I drew a really crude wiring diagram. http://goo.gl/kAj5wH
Note that it is important the two packs are balanced within a few volts of
each other after the series charging. Otherwise when you reconnect them in
parallel they will arc across the connector and cross charge at a VERY HIGH
AMPERAGE.
T-Rex / KD
SSI-Racing
-----Original Message-----
From: Steve Clunn via EV
Sent: Thursday, March 26, 2015 7:15 AM
To: [email protected]
Subject: [EVDL] charging two parallel packs in series
>Subject: [EVDL] Open Circuit Voltage Across Contactors
I've got two Anderson contacts on my pack, one on the negative side and one
on the positive side. So when the key is out of the ignition, the
controller and all other components are separated from the traction pack. I
currently have a 120V system, with two strings in parallel, because I have a
Curtis controller, which has a 144V max. I would, however, like to be able
to charge faster with my PFC-30. So my question is, if I reconfigure the
packs to be in series for charging, is there any problem, since both
contactors will be open?
Bill>
This could be done safely by leaving one pack ( pack A ) hooked up normally
then using two Anderson connectors with your charger being the only thing
connected to pack B's battery plus ,chargers neg will go to pack A's neg.
Pack B will hook to pack A using a 175amp or bigger Anderson disconnect with
pack A's pluses going to pack B's plus and A's neg to B's neg , this will be
for driving and parallel charging . Pull the disconnect and plug in a
Anderson jumper plug which will connect the A packs positive to the B packs
negative and now your are charging in series. If you forget to switch back ,
no big deal you will just be running on pack A . A few ways to set up these
Anderson's , I think the 175 amp Anderson would be big enough . I would have
one on pack A and 2 and pack B ( one for series and one for parallel ) The
series plug will have its b+ plug going to the B packs neg .
shameless plug ,, we sell them but there not on the web site
Steve Clunn
Merging the best of the past with
the best of the future.
www.Greenshedconversions.com
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