Hello Peter,
You do not have to disconnect the battery from the string while charging it.
I do this about once a month, when I want to bring up the lower battery
voltage up to match the other batteries.
I first charge the pack with the main charger, and then let the batteries
set for awhile. A 6 volt battery at 100% SOC should have a voltage of
6.37V, even letting them set for about 24 hours, they may still read about
6.4V. So put about a mile driving load on them until all of the batteries go
below 6.37V.
It then takes a very short time to charge each battery.
Roland
----- Original Message -----
From: "SLPinfo.org" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Friday, September 17, 2010 8:22 AM
Subject: [EVDL] Really dumb (?) charging question
> Hey folks,
>
> I've wanted to ask this question for a while but have felt incredibly
> stupid
> about doing so. An important preface - I'm not an engineer nor an
> electrical or electronics expert! My EV is my commuter and not a project
> or
> a hobby.
>
> Ocassionally it happens that you want to charge an individual battery in
> your string (specific reason unimportant here). I usually dread doing so
> because I feel I have to disconnect the battery cables that connect that
> particular battery to the adjoining batteries in the string before doing
> so. For example, if I want to charge battery #3, I disconnect the cable
> between #2 and #3 and the cable between #3 and #4. One reason I dread
> doing
> this is that, given Roland's and others advice here (which makes good
> sense), once I put it back together I have to remember to check the
> tightness of the connections for the next few days (and I worry about
> forgetting to do so). And, truth be told, I'm also basically pretty lazy.
>
> I'm wondering if it is really necessary for me to disconnect those
> adjoining
> cables? I have a main breaker that I activate while I'm working on the
> batteries. This opens entire the 120V circuit. Would it be sufficient to
> simply activate the breaker and (without disconnecting anything) hook up
> my
> 12V smart charger to the battery in question and start charging? Wouldn't
> the open breaker limit the charge circuit to between the positive and
> negative terminals of the battery the charger is connected to? Or would I
> get some 'spillover' or inteference from the adjoining batteries that are
> still connected? Or is this a particularly dangerous and horrible idea?
>
> - Peter Flipsen Jr
> http://www..evalbum.com/1974
> -------------- next part --------------
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You do not have to disconnect the battery from the string while charging it.
I do this about once a month, when I want to bring up the lower battery
voltage up to match the other batteries.
I first charge the pack with the main charger, and then let the batteries
set for awhile. A 6 volt battery at 100% SOC should have a voltage of
6.37V, even letting them set for about 24 hours, they may still read about
6.4V. So put about a mile driving load on them until all of the batteries go
below 6.37V.
It then takes a very short time to charge each battery.
Roland
----- Original Message -----
From: "SLPinfo.org" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Friday, September 17, 2010 8:22 AM
Subject: [EVDL] Really dumb (?) charging question
> Hey folks,
>
> I've wanted to ask this question for a while but have felt incredibly
> stupid
> about doing so. An important preface - I'm not an engineer nor an
> electrical or electronics expert! My EV is my commuter and not a project
> or
> a hobby.
>
> Ocassionally it happens that you want to charge an individual battery in
> your string (specific reason unimportant here). I usually dread doing so
> because I feel I have to disconnect the battery cables that connect that
> particular battery to the adjoining batteries in the string before doing
> so. For example, if I want to charge battery #3, I disconnect the cable
> between #2 and #3 and the cable between #3 and #4. One reason I dread
> doing
> this is that, given Roland's and others advice here (which makes good
> sense), once I put it back together I have to remember to check the
> tightness of the connections for the next few days (and I worry about
> forgetting to do so). And, truth be told, I'm also basically pretty lazy.
>
> I'm wondering if it is really necessary for me to disconnect those
> adjoining
> cables? I have a main breaker that I activate while I'm working on the
> batteries. This opens entire the 120V circuit. Would it be sufficient to
> simply activate the breaker and (without disconnecting anything) hook up
> my
> 12V smart charger to the battery in question and start charging? Wouldn't
> the open breaker limit the charge circuit to between the positive and
> negative terminals of the battery the charger is connected to? Or would I
> get some 'spillover' or inteference from the adjoining batteries that are
> still connected? Or is this a particularly dangerous and horrible idea?
>
> - Peter Flipsen Jr
> http://www..evalbum.com/1974
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> http://lists.sjsu.edu/mailman/private/ev/attachments/20100917/f9732049/attachment.html
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
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