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Unread 06-12-2016, 08:57 PM   #1
Gone Wild
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Default 50% State of charge

A neighbor of mine came by today to ask me why when his pack is fully charged his dsah meter (E-Z GO Freedom) only registers 3/4. I mentioned that they are not the best gauges and showed him my ScottyB digital meter. Gave the usual speil but when I mentioned that he should never go below 50% SOC (48 Volts) he looked at me sideways. So here is the question, how does 48 volts translate into 50% SOC on a 48 Volt pack. JohnnieB or Sergio If you answer keep it simple so my head doesn't explode. Thanks in advance.
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Unread 06-12-2016, 09:12 PM   #2
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Default Re: 50% State of charge

In the "Sticky-Everything to do with batteries" post #3 (above in this section) has the chart you need.


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Unread 06-12-2016, 10:03 PM   #3
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Default Re: 50% State of charge

48 volt pack if able to will charge to 50.9 to 51.2 volts and at 50 % SOC the voltage will be 48.4 volts, easy as that....
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Unread 06-12-2016, 10:58 PM   #4
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Default Re: 50% State of charge

I don't think you understood my question. How do you explain to someone that that 50% of 50.9 or 48 or 51.9 is 48 volts.
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Unread 06-12-2016, 11:05 PM   #5
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Default Re: 50% State of charge

Print the chart and show him that below 46v. they stop being batteries and become door stops.


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Unread 06-13-2016, 05:31 AM   #6
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Default Re: 50% State of charge

The voltage is not capacity. The voltage is just the size of the battery. To explain to someone, just state that. The capacity is how many usable electrons the battery can hold. When the voltage changes or goes down that is because the electrons have been used. The battery charger does not put voltage back into the battery, it puts electrons back.

This is a simple way of saying it. The real words are too hard for the average person the know what they mean, and for me to spell.
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Unread 06-13-2016, 09:11 AM   #7
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Default Re: 50% State of charge

A battery cell consists of two lead plates a positive plate covered with a paste of lead dioxide and a negative made of sponge lead, with an insulating material (separator) in between. The plates are enclosed in a plastic battery case and then submersed in an electrolyte consisting of water and sulfuric acid (see figure # 1). Each cell is capable of storing 2.1 volts.

http://www.progressivedyn.com/battery_basics.html
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Unread 06-13-2016, 09:33 AM   #8
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Default Re: 50% State of charge

People have a need to know the state of charge of their batteries whether it be phones, computers, golf carts or whatever. Battery engineers have determined that a battery's capacity remaining (state of charge or SOC) can be estimated by tracking the battery's voltage. Hence we have the chart below.

People assume a 12v battery is 12volts but that is just the nominal voltage. A fully charged 12v battery is actually 12.73 volts and a dead one is around 11.5 or less. If you put your volt meter on your car battery it will read about 12.7 volts and if the car is running it would read 14+ volts because the alternator has to put out more than the 12.7 volts or the battery wouldn't charge. Multiple matched batteries wired in series act the same as an individual.

The battery meter in your friends cart is basically a volt meter with a display in a bar graph. There are built in delays in an attempt to make it act like a "gas" gage. The digital volt meters are instantaneous so they cycle as the cart is driven and you have to let the batteries "settle" after driving or charging to get a meaningful reading but it is more accurate.

To address the specific issue of the bar graph meter only reading 3/4 full after charging. The most likely cause for this is terminating the charging sequence early for some reason. Power failure or human intervention is most common. The gage needs to see a certain voltage well above nominal pack voltage for a specific time period before it resets to "full". Remember, a properly functioning 48v charger will take a 48v pack upwards of 60-65 volts before automatic shut off.

At least this is how I understand it.
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