In my 15 year EV driving experience, my Blazer EV conversion had 6 Zivan
K2 chargers (two 240VAC, four 120VAC). So, I feel I am qualified to
share my views on the K2
http://brucedp.150m.com/blazer/blazer020504-001.jpg
When purchasing the K2's, the 120V output models were purchased and
adjusted at the distributor for my 132VDC T145 pack. Each one of the k2
models are limited in how much they can be adjusted (a 120VDC output
model could work with a 132VDC to 112VDC pack, etc.). Asking to adjust
the charger below or above those limits was refused by the distributor
(Greg), stating that is not what they were designed for, that a charger
for that pack voltage should be purchased. That seems rather
restrictive, but there it is. Obviously, the Zivan chargers are not
adjustable beyond their stated design.
When set correctly, the K2 chargers worked fine. And I also have heard
horror stories of how K2 chargers have over and under charged packs, or
those some packs were prematurely aged. That is why I had any Zivan
charger I had, used adjust correctly by a person who knows how (I have
the technical knowledge but not the test setup jig/rig that the
distributor had, who went through the adjustment procedure three times
on each charger).
Later, I changed out two of my K2 120VAC chargers (someone else bought
and used them) for other chargers. Of those that I tested were a Zivan
NG3, and a NG5. Those were properly adjusted and worked fine for me.
Conclusion: Zivan chargers need to be designed and properly adjusted for
the pack voltage you are charging. Else you will have problems which can
harm your pack.
{brucedp.150m.com}
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On Thu, Aug 15, 2013, at 09:44 AM, EVDL Administrator wrote:
> On 13 Aug 2013 at 22:55, Steve Powers wrote:
>
> > Not sure with this charger (Zivan K2 that I took out of my other
> > car) I can ever get it dialed in perfect, but it has to be a whole lot
> > better
> > than the QuickCharger that is in there now which has no adjustment.
>
> Not so sure about that. I know someone who gave up on a K2 because it
> consistently overcharged his battery. He couldn't adjust the finishing
> voltage low enough, and Zivan's distributor simply refused to program it
> any
> lower.
>
> Others have posted similar experiences here.
>
> IMO, the K2 was a decent low-cost EV charger, but the US distributor
> didn't
> do it any favors with their stubborn focus on a rolling-boil algorithm.
>
> On 14 Aug 2013 at 7:48, SLPinfo.org wrote:
>
> > My reading of the Trojan data sheets is that the T1275s store 150AH
> > (20 hr > rate) while the T875s store 170AH. That should mean about
> > 13% more range with the T875s.
>
> Widespread experience says the 8v will outlast the 12v. They can handle
> higher currents. Also, a given discharge regimen cycles them less
> deeply.
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