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Old 04-12-2017, 07:36 AM   #1
GCManiac
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Default Using EzGo Total Charge

Have read the manual for EzGo Total Charge lll but still have a question.
It will automatically start charging if plugged in and senses voltage.
It states it will continue the charge cycle of power is interrupted and restored.
So....if left plugged in to cart while away for extended period, if the charge on battery pack drifts enough, will it turn on and charge to full, then shut back off?
Been debating on springing for a fancy new DPI Accusense ($$$$) but if this old charger will accomplish what is needed...albeit without a float mode....then why spend the money?
Course I do wonder about safety...even with new charger....if away while operating.
Thanks for any guidance.
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Old 04-12-2017, 08:49 AM   #2
JohnnieB
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Default Re: Using EzGo Total Charge

Spring for the DPI Accusense charger.

The manuals for numerous chargers make claims that at variance with the way the charger actually operates. For example the last paragraph on page B-1 of the TC-III manual implies that it uses dV/dT (change in Voltage over change in Time) technology to determine when to terminate the charging cycle, but shuts off when the On-Charge voltage climbs into the 44V to 46V range like the other ferroresonant transformer type golf cart battery chargers of that bygone era.

In other words, it shuts off at a predetermined voltage that is almost high enough to fully charge relatively new, healthy batteries, but not so high that older, not so healthy batteries are overcharged. The DPI uses true dV/dT technology and fully charges the batteries regardless of aging.

The claim that the TC-III restarts after a power failure can be, and should be, verified by unplugging it from the wall outlet, waiting a few minutes and then plugging it back in. Many of the chargers from that era had to be unplugged from cart to resume a charging cycle, or initiate a new one.

As for the claim that the TCV-III initiates a charging cycle when the battery pack self discharges down into the 36.7V (~ 60% SoC) to 37.3V (~75% SoC) range, it is more or less a moot point since the damage is already done by the time the pack voltage reaches the point at which the charger initiates a charging cycle.

The average SoC maintained throughout a battery's usable lifespan is a major determining factor of how long their lifespan is. With the TC-III, the SoC peaks at almost 100% SoC and drifts done to 70% SoC or less over about a month before being brought back up to nearly 100% SoC, thereby reducing the average SoC maintained. With the DPI and float charging, the SoC stays at 100% except when the cart is being driven and being charged after that drive.

Also, the TC-III is designed to charge Trojan brand batteries and their clones. If you use other brand batteries, they have different charge profiles and the DPI has user selectable charge profiles.
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