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Electric Yamaha Electric Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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08-25-2020, 12:52 PM | #21 | |
Gone Wild
Join Date: Nov 2016
Location: near Calgary, AB, Canada
Posts: 1,511
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Re: Only 37.2v After Full-Charge
Quote:
According to the manual: The initial charge rate will vary from 16 to 25 amperes, depending upon the condition of the batteries and how much the batteries have been discharged. If the batteries are heavily discharged and the AC input line voltage is higher than nominal, the initial charge rate may exceed 25 amperes. Under normal conditions the charge rate will taper to less than 25 amperes within 30 minutes. If the ammeter still reads 25 amperes or more after 30 minutes, turn the charger off by disconnecting the power supply cord from its outlet. During charge, the battery voltage increases gradually which causes the charge rate to decrease. Good battery cells should each rise to approximately 2.5 volts DC which will allow the charge rate to taper to less than 6 amps. Since each cell accepts charge at a slightly different rate, normal charging with the ammeter reading in the 4 to 8 amps area for the last few hours of charge is important to achieve equalization of all battery cells every time the batteries are charged. As batteries age, individual cells weaken resulting in lower than normal finish charge voltage. As the finish charge voltage decreases, the charge rate will no longer decrease and taper into the 4 to 8 amps range on the ammeter. The electronic timer will, however, still determine when the batteries have reached full charge and turn the charger off. Even though they are properly charged, older batteries will gradually lose capacity, and should be replaced when they will no longer perform as required. The charger turns off automatically when the batteries reach full charge. I would suggest comparing the charge profile that is described above with what you are seeing with your charger. It if follow the described profile, it is likely not your charger but your batteries getting weaker ... or damaged because of improper or extreme use / charging / maintenance by the previous owner. As mentioned before ... try multiple back to back charges on the batteries to see if you can improve their state of charge. That will give you another data point to determine if your batteries are also weak. You might want to consider upgrading to a newer smart charger if you decide that the batteries require replacement. I was in your same position when I bought my cart ... 3 or 4 year old batteries that had been poorly maintained ... a 1998 vintage charger ... when the batteries finally crapped out, I replacement them and bought a new smart charger to better protect my investment in new batteries. |
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08-25-2020, 02:12 PM | #22 | |
Not Yet Wild
Join Date: Aug 2020
Posts: 16
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Re: Only 37.2v After Full-Charge
Quote:
Thank you so much for the info and resources. I'll try the above mentioned recommendations and report back my findings. |
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