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Re: How long is too long?
by Roland Wiench
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If you are discharge down to 50% DOD it is advise to charge it as soon as
possible. If down to 30% DOD you can wait 12 hours or to the next day.
If I am only to 10 to 20% DOD, and still at that level for days, I will
normally charge every 4 days at that rate.
You can charge every time you want, no matter what the DOD is. My method
for charging if I only use 5 ah out of the battery then charge at 5 amp. If
you use 10 ah, then 10 amps or 20 ah, then 20 amps and etc.
Remember at this low usage of ah, you are normally in the finish charging
cycle, so do not apply the normal maximum charge your battery charger can
attain.
Anytime I charge the battery with only 5 to 20 ah use, I only charge it to
the maximum voltage then shut down the charger. For my 6 volt batteries
that when the battery gets to 7.4 volt. This may between 95 to 98% SOC.
About once a week, I may applied a finish charge to bring them up to 100% if
I have any battery more than 0.02 volts out of balance otherwise I will
applied the finish charge about once a month after I water them and do a
equalization charge of 7.78 volts per 6 volt battery.
Roland
----- Original Message -----
From: "Richard Acuti" <dmc650@...>
To: <ev@...>
Sent: Tuesday, May 13, 2008 8:33 AM
Subject: [EVDL] How long is too long?
>
> So, if allowing a partially discharged battery to sit too long is damaging
> because the battery builds up sulfate on it's plates, how long is too
> long?
>
> For example, I'm using sixteen 8 volt flooded batteries. My new commute
> has my driving 6 gentle miles one way, (resting voltage of about 137v)
> parking for 12 hours, then returning home, over a route that is 6-9 gentle
> miles depending on which way I choose to drive for 12-15 miles round trip.
> I plug in immediately upon returning to home in the evening.
>
> Is 12 hours too long? Am I risking permenant sulfation?
>
> On my last pack, I was driving 15, harder discharging miles one way, but I
> was charging up immediately upon arrival at my destination, and then
> charging immediately upon returning home.
> ________________________________
>
> Rich A.
> Maryland
> http://www.austinev.org/evalbum/371.html
> http://patriotfuel.blogspot.com/
>
>
>
>
> _________________________________________________________________
> Stay in touch when you're away with Windows Live Messenger.
> http://www.windowslive.com/messenger/overview.html?ocid=TXT_TAGLM_WL_Refresh_messenger_052008
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
possible. If down to 30% DOD you can wait 12 hours or to the next day.
If I am only to 10 to 20% DOD, and still at that level for days, I will
normally charge every 4 days at that rate.
You can charge every time you want, no matter what the DOD is. My method
for charging if I only use 5 ah out of the battery then charge at 5 amp. If
you use 10 ah, then 10 amps or 20 ah, then 20 amps and etc.
Remember at this low usage of ah, you are normally in the finish charging
cycle, so do not apply the normal maximum charge your battery charger can
attain.
Anytime I charge the battery with only 5 to 20 ah use, I only charge it to
the maximum voltage then shut down the charger. For my 6 volt batteries
that when the battery gets to 7.4 volt. This may between 95 to 98% SOC.
About once a week, I may applied a finish charge to bring them up to 100% if
I have any battery more than 0.02 volts out of balance otherwise I will
applied the finish charge about once a month after I water them and do a
equalization charge of 7.78 volts per 6 volt battery.
Roland
----- Original Message -----
From: "Richard Acuti" <dmc650@...>
To: <ev@...>
Sent: Tuesday, May 13, 2008 8:33 AM
Subject: [EVDL] How long is too long?
>
> So, if allowing a partially discharged battery to sit too long is damaging
> because the battery builds up sulfate on it's plates, how long is too
> long?
>
> For example, I'm using sixteen 8 volt flooded batteries. My new commute
> has my driving 6 gentle miles one way, (resting voltage of about 137v)
> parking for 12 hours, then returning home, over a route that is 6-9 gentle
> miles depending on which way I choose to drive for 12-15 miles round trip.
> I plug in immediately upon returning to home in the evening.
>
> Is 12 hours too long? Am I risking permenant sulfation?
>
> On my last pack, I was driving 15, harder discharging miles one way, but I
> was charging up immediately upon arrival at my destination, and then
> charging immediately upon returning home.
> ________________________________
>
> Rich A.
> Maryland
> http://www.austinev.org/evalbum/371.html
> http://patriotfuel.blogspot.com/
>
>
>
>
> _________________________________________________________________
> Stay in touch when you're away with Windows Live Messenger.
> http://www.windowslive.com/messenger/overview.html?ocid=TXT_TAGLM_WL_Refresh_messenger_052008
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
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