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Old 03-21-2017, 06:24 PM   #1
Kashmir
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Default By-passing relay in Powerdrive 2 charger

Ok, while waiting on the DPI charger to come in, I am going to by-pass the relay inside my Powerdrive 2 charger to charge the new set of Crown's.
I know how to by-pass the relay and get the charger to charge, my question is once I have it charging, when should I terminate the charge?
I've read take it up to 63-65 volts then disconnect. Is that how I should do it?
I would be checking on it every half hour or so. I am hoping to get the pack to be at about 49 volts at rest (somewhere near 60%). Daughter is cruising the neighborhood right now trying to wear them down a bit.
I am just starting the "break in" phase of these batteries and this will be the very first charge. The DPI should arrive on Monday and after that I am figuring I'll be good to go. But I wanted to start break in now and get a few charges in.


So what do the experts say?
Charge them to how many volts?
With a new pack at about 60% - 70%, how long do you think the charge will take?

All feedback welcome!!
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Old 03-21-2017, 06:57 PM   #2
Kashmir
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Default Re: By-passing relay in Powerdrive 2 charger

My cell phone and the wife's cell will have alarms for every half hour.
Brand new Crowns...not wanting to mess these up!!!
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Old 03-21-2017, 06:58 PM   #3
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Default Re: By-passing relay in Powerdrive 2 charger

Quote:
Originally Posted by Kashmir View Post
My cell phone and the wife's cell will have alarms for every half hour.
Brand new Crowns...not wanting to mess these up!!!
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Old 03-22-2017, 07:59 AM   #4
Kashmir
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Default Re: By-passing relay in Powerdrive 2 charger

Charge started at 2040 Tuesday with the Powerdrive with relay jumped. Checked on it every hour after 2300. Between hours four and six, there was a lot of bubbling going on in the batteries but they never even got warm to the touch.
At 0740 today the voltage was at 63.3, so I terminated the charge cycle. The amp meter was at four amps since about 0100.
I am hoping that I did this correctly.
Seems like I did. Nothing got hot and there was no gassing at all.
We'll see what it looks like this evening after resting 10-12 hours.




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Old 03-22-2017, 09:22 AM   #5
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Default Re: By-passing relay in Powerdrive 2 charger

Kashmir,

Good job!!
Sounds like you are a good baby sitter, and took good care of your new Kings, I mean Crowns.
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Old 03-22-2017, 09:48 AM   #6
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Default Re: By-passing relay in Powerdrive 2 charger

FYI - when you hot wire / jumper the transformer it puts out max amperage only, not a charge algorithm as it would when controlled by a circuit board.

This might be important to consider as a typical charge algorithm only bulk charges for 20-60 minutes and then the amp output drops to a lower absorption level and then lower (5a) for finishing or float rates.These lower rates are the bulk of the charge time.
I would suggest to minimize hours and hours of high rate charge. It's not gonna hurt once or twice but I would not recommend much more than that.
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Old 03-22-2017, 09:58 AM   #7
Kashmir
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Default Re: By-passing relay in Powerdrive 2 charger

Scotty, the amps were below 10 amps by 2230, so not even two hours at full bore....
Is there a way to cut the amps down sooner and continue the cycle?


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Old 03-22-2017, 10:12 AM   #8
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Default Re: By-passing relay in Powerdrive 2 charger

If amperage drops it sounds like the charger has a control board.
I misunderstood thought you were using a charger without any control.
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Old 03-22-2017, 10:14 AM   #9
Kashmir
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Default Re: By-passing relay in Powerdrive 2 charger

I am using a Powerdrive 2 charger


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Old 03-22-2017, 10:24 AM   #10
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Default Re: By-passing relay in Powerdrive 2 charger

You should unplug the Powerdrive 2 once the batteries get to 60v maximum or you are just eroding the plates.

Since you don't have the OBC to regulate the current, the amount of current that flows from charger to batteries is directly related to the difference in voltage from the charger output to the pack voltage.

The OBC, or a smart charger, will start to throttle the current once the pack voltage reaches around 56v or about 80% recharged.

The remaining 20% absorption charge is done at a regulated current in order to slowly raise the voltage.

The 63.3v you got is probably the maximum Your batteries can go at your current ambient temperature.

Hopefully you will get your DPI soon so I would not charge it again with the unregulated PowerDrive2 for another 2 weeks.
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