Steve, Bill;
I made this schematic, also complementing the one Michael sent, but
using an automatically 'connect/disconnect' for both packs at charging and
use modes.
https://plus.google.com/u/0/photos/109469848356360136281/albums/613061501260
0294641/6130615018680184210?pid=6130615018680184210&oid=10946984835636013628
1
Considering what Michael says about having balanced both packs. This
configuration will only works if both packs are discharged and charged at
the same time. This way, acring may no be as big to have special
considerations since both packs are going to be similar power, most of the
time.
From my schematic: Coil 1 may be a small 50amp 12/24Vdc contactor
just to put both battery packs in series for charging and support charger
max Amp rate, and it will only works when connected to AC as same time as
the charger. The power supply is only for powering the coil 1 and probably a
relay just to inhibit the ingition switch to go ON.
Coils 2, 3 and 4 may be a LEV200 or similar, high power contactors
that will provide power to th EV as usual main contactors do. But this
configuration will also give you the chance to power only 'coil 1' and use
pack A or power 'coil 2 &3' and use pack B. But as mentioned before by
Michael this will unbalance packs and Arcs may be present at a future point.
Also, when charging, one pack will reach fully charge before the other,
taking too much time to balance it after that. So I would recommend not
using it separately. (may be just for emergency situations or servicing one
pack)
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 Michael Kadie via EV
Enviado el: jueves, 26 de marzo de 2015 10:46 a.m.
Para: Steve Clunn; [email protected]
Asunto: 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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