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Unread 02-17-2014, 05:11 PM   #1
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Default 48v pack voltage while under a load??

Looking for some readings from folks.

Can you please post your entire pack voltage when driving while under a load.
While driving uphill or with cart full of passengers.

After a full charge and even after 10-20 minutes of running around I'm getting 46-46.5 volts while under load heading up a rather steep hill.

Thanks
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Unread 02-17-2014, 05:21 PM   #2
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Default Re: 48v pack voltage while under a load??

Quote:
Originally Posted by gsf35099 View Post
Looking for some readings from folks.

Can you please post your entire pack voltage when driving while under a load.
While driving uphill or with cart full of passengers.

After a full charge and even after 10-20 minutes of running around I'm getting 46-46.5 volts while under load heading up a rather steep hill.

Thanks
. . . after getting off the hill, what does pack level off to?
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Unread 02-17-2014, 05:21 PM   #3
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Default Re: 48v pack voltage while under a load??

Your readings sound ok. My batts are 4 years old and when I am going up a hill the pack will drop down to around 45-46 volts, sometimes lower than that if they are more discharged. The important thing is resting voltage to determine SOC...
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Unread 02-17-2014, 05:42 PM   #4
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Default Re: 48v pack voltage while under a load??

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Originally Posted by Stevegrmich View Post
. . . after getting off the hill, what does pack level off to?
They return to strong reading like ~50.3-51 normally pretty quick. Longer they sit, higher it goes to 51+
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Unread 02-17-2014, 05:43 PM   #5
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Default Re: 48v pack voltage while under a load??

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Originally Posted by jakesnake27 View Post
Your readings sound ok. My batts are 4 years old and when I am going up a hill the pack will drop down to around 45-46 volts, sometimes lower than that if they are more discharged. The important thing is resting voltage to determine SOC...
What is SOC?
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Unread 02-17-2014, 05:51 PM   #6
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Default Re: 48v pack voltage while under a load??

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What is SOC?
State of charge
Draining batts below 50% shortens their lifespan. Here is a good chart...

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Unread 02-17-2014, 05:54 PM   #7
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Default Re: 48v pack voltage while under a load??

Everything sounds normal , SOC= state of Charge , there are look up tables
To determine your %soc -never discharge batteries below 50% SOC
Never go below 42 volts for 48 volt system while under load

Edit : I guess Jake beat me to it
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Unread 02-17-2014, 06:03 PM   #8
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Default Re: 48v pack voltage while under a load??

Thanks gang. Looks like my pack is doing fine.
I started having a torque issue last August (first when I really noticed it) and it has slowly gotten worse. I have a very steep 10' ramp I drive up from my boat lift in my back yard and the cart has been struggling to make it up. The cart used to climb it in a hurry and I think my motor has just gotten old and needs a good rebuild. It is a 91 36 volt.
Hopefully I can get it off easy and get it to Plum Quick for the Bandit rebuild.
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Unread 02-17-2014, 06:08 PM   #9
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Default Re: 48v pack voltage while under a load??

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Originally Posted by Great white north View Post
Never go below 42 volts for 48 volt system while under load
LOL. I freekout if they go below 46 under a load!!! Don't think I have ever had them below 46 volts at SOC.
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Unread 02-17-2014, 07:02 PM   #10
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Default Re: 48v pack voltage while under a load??

I've had as low as 43 - 44 but that was when it was only 25 degrees F out , in the fall and two people going up hill , temp . Makes a huge difference on battery performance
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