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Unread 12-31-2012, 05:54 PM   #1
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Default Voltage of pack on Meter as Charging

Okay gang,
Now that several folks have been installing digital volt meters on carts, I thought I might see if we can get some data on packs charging.

My 48v pack being charged with a Delta Q on-board charger looks to be hitting about 65 (currently 64.7V) volts while its in the last bake-out mode.

Anyone else paid any attention to what their pack voltage is towards the end of a charge?
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Unread 12-31-2012, 05:57 PM   #2
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Default Re: Voltage of pack on Meter as Charging

In fact, the charger may have to take a 48V battery pack up to 67V, or above, to fully charge it.
On the other hand, 59V may fully charge a 48V battery pack.
The voltage it takes to fully charge a 48V battery pack depends on who manufactured the batteries in the pack as well as their age and condition.

By definition, a lead-acid wet cell is fully charged when the specific gravity of the electrolyte ceases to increase while a charging current is passing through it. Since open-circuit voltage increases/decreases as the electrolyte's specific gravity increases/decreases, open-circuit voltage is an indirect or secondary means of monitoring the electrolyte's specific gravity and is often used to do so.

An ideal charger would monitor pack voltage and when it ceased to rise over a predetermined period of time, it would stop the regular charging mode and go into a float charge mode, however few, if any, chargers typically used by golf cart owners are ideal. Most of them simply shut off at a predetermined voltage that is high enough to almost fully charge most battery packs without being so high that repeated use would significantly harm battery packs that are fully charged at the lower end of the typical voltage spectrum needed to fully charge a battery as determined by empirical data.

Here is Trojan's recommended charge curve for a single (2V) deep cycle wet cell. There are 24 cells in a 48V battery pack, so do the math and you get 58.80V to 66.96V. However, Trojan uses an electrolyte that is 27.7% sulfuric acid by weight (SG = 1.277) and other battery manufacturers use different concentrations, so the on-charge voltage that is typically reached when their batteries are fully charged, will be higher or lower.- Quote- JonnieB
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Unread 01-01-2013, 11:11 PM   #3
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Default Re: Voltage of pack on Meter as Charging

Wow what an answer. U trying to compete with Johnnyb?
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