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Old 01-07-2017, 07:25   #1
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Charging golf cart batteries hooked up in series

Just installed four (4) 6 volt batteries for the house bank. My problem, (and I did search here a bit), is that our Noco Genius Gen 3 only seems to be putting out 12. 8 to 12.9 volts. It worked fine for the other bank. Do I need a charger specific for golf cart batteries? Or is my 1 year old charger pooched?
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Old 01-07-2017, 07:33   #2
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Re: Charging golf cart batteries hooked up in series

Amps are what matters here. If the batteries are deeply discharged the charger voltage will be low until the battery voltage comes up as well.

How many amps are you getting from the charger?
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Old 01-07-2017, 07:37   #3
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Re: Charging golf cart batteries hooked up in series

Charger should be 10% of bank capacity, or 40 amps for your 4 golf cart batteries.
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Old 01-07-2017, 07:40   #4
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Re: Charging golf cart batteries hooked up in series

What make/model batteries?

Assuming your bank is 400A FLA, a 40A charger would IMO be barely adequate, up to 100A would not be a waste of money.

If these were top-quality AGMs rather than vanilla FLA, then 100A would be a more likely minimum for longevity, some mfg spec 160A. As a minimum.
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Old 01-07-2017, 07:44   #5
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Re: Charging golf cart batteries hooked up in series

It is a 3 bank, 30 amp charger, so 10 amps to the house bank.
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Old 01-07-2017, 07:46   #6
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Re: Charging golf cart batteries hooked up in series

Sams Club Duracell, made by Penn?
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Old 01-07-2017, 07:46   #7
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Re: Charging golf cart batteries hooked up in series

Charger is way to small for that bank if it only puts out 10 amps. When you did your search did you use the "Google custom search"? The other search is brain dead.
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Old 01-07-2017, 07:58   #8
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Re: Charging golf cart batteries hooked up in series

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Originally Posted by Allan S View Post
It is a 3 bank, 30 amp charger, so 10 amps to the house bank.
How many amps is it currently supplying to the batteries? If the batteries are deeply discharged 10amps is a trickle of current. so lets say you have 400AH of capacity discharged 50%. Thats 200AH you need to replace. that would be 20 hours of charging in a perfect no loss world. Reality will be closer to 30-40 hours to acheive 100%.

so your charger may be working fine, but it's small, and if you cannot measure the amps it's pumping into the batteries you have no choice but to wait for it to bring the voltage up, unless it's dead.
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Old 01-07-2017, 08:06   #9
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Re: Charging golf cart batteries hooked up in series

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It is a 3 bank, 30 amp charger, so 10 amps to the house bank.
put all three outputs to House, but just a temp workaround until you buy a right-sized unit.
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Old 01-07-2017, 08:14   #10
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Re: Charging golf cart batteries hooked up in series

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Sams Club Duracell, made by Penn?
so 430AH @12V

My recommendations above are a bit on the low side, but obviously anywhere in that ballpark would be better than what you have now.

Sterling ProCharge Ultra*and ProMariner Pronautic P are my preferred charger lines.

Yes pricey, but these in particular are more future-proof as well, let you set custom voltage and charge algorithms if you go to higher-end chemistries in the future.

Others will have less expensive recommendations, but you don't want a garage style unit designed for Starter batts, marine stuff performs much better, is very robust and long-lived.
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Old 01-07-2017, 08:50   #11
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Re: Charging golf cart batteries hooked up in series

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Amps are what matters here. If the batteries are deeply discharged the charger voltage will be low until the battery voltage comes up as well.

How many amps are you getting from the charger?
This is incorrect. Bulk charging should be around 14.8v with as much current (amps) that the charger can put out. It is the high voltage that helps reduce sulfating and the subsequent early demise of a battery.

The rule of thumb for charger capacity is 10% of bank size plus some for house loads that might be on while the battery is charging.

A 4 GC battery bank has a capacity of 400 AH to 460 AH. A 50 amp charger would be the correct minimum size. Bigger can be a bit better, but there reaches a point where the cost doesn't provide much additional benefit. Check the price difference between the 50 and 60 amp Pronautic Chargers.

I have a 4 GC bank with Dekka batteries, 230 ah per battery for a 460 total capacity. Charge it with a Pronautic Promariner 50 amp. When in bulk stage the voltage is about 14.8 with 50 amp out put as the battery charge increases, the current drops first followed by the voltage.

Check out this site for more in-depth information on batteries and charging: Marinehowto.com
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Old 01-07-2017, 09:01   #12
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Re: Charging golf cart batteries hooked up in series

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Originally Posted by Dave Lochner View Post
This is incorrect. Bulk charging should be around 14.8v with as much current (amps) that the charger can put out. It is the high voltage that helps reduce sulfating and the subsequent early demise of a battery.



The rule of thumb for charger capacity is 10% of bank size plus some for house loads that might be on while the battery is charging.



A 4 GC battery bank has a capacity of 400 AH to 460 AH. A 50 amp charger would be the correct minimum size. Bigger can be a bit better, but there reaches a point where the cost doesn't provide much additional benefit. Check the price difference between the 50 and 60 amp Pronautic Chargers.



I have a 4 GC bank with Dekka batteries, 230 ah per battery for a 460 total capacity. Charge it with a Pronautic Promariner 50 amp. When in bulk stage the voltage is about 14.8 with 50 amp out put as the battery charge increases, the current drops first followed by the voltage.



Check out this site for more in-depth information on batteries and charging: Marinehowto.com


It's entirely correct in the context of the OP's original question.
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Old 01-07-2017, 09:12   #13
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Re: Charging golf cart batteries hooked up in series

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Bulk charging should be around 14.8v with as much current (amps) that the charger can put out.
The actual voltage varies widely depending on the bank chemistry; best to follow mfg specs.

And that setpoint is just the "goal" of Bulk stage, by definition the actual voltage, as measured at the bank, will be between that and the battery's starting V, the combined result depends on SoC and amps output.

So, putting such low amps into a very depleted bank may well result in 12.something for many hours even if Bulk setpoint is 14.4-14.7V, which is what East Penn (Deka, one K) recommends for these FLA GC2s.

They also spec a .3C charge rate, in this case 130-160A would be best, 100A would be "only" .2C and IMO even 60A is minimum I would recommend.

Equalization (fighting sulphation) is 15.0V to 15.3V

Of course the OP's charger may also be faulty as well as undersized.

A charger that puts out 10% of AH (.1C) may do the job, but to me relatively permanent infrastructure like a charger really should spend that bit more so you won't need to replace it down the road. The current bank is by comparison a consumable item, and the next one will likely need a higher rate, as well as a different voltage setpoint.
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Old 01-07-2017, 09:51   #14
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Re: Charging golf cart batteries hooked up in series

Charger capacity should be 25% of battery amps as a minimum (.25 c).

My experience with these batteries is to be at the higher end of charge recommendations. 14.8 v for bulk, and floating at 13.4 to 13.6 v depending on temp. My set will be 5 years old in a few months and I will check specific gravity to confirm condition. Based on recent charge requirements I don't think that they have lost more than about 10% capacity which is pretty good performance.

The amount of battery replacement fluid is a good indicator of battery charge voltage.
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Old 01-07-2017, 10:41   #15
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Re: Charging golf cart batteries hooked up in series

I am currently undersized in the charger department, with my original 12A Pro Mariner and about to install 2XGC for 230 AH and the starter battery. This is a power boat, not a sailboat, so I wonder if between the solar panel (260A), the alternator and the charger, the only drawback is a longer time to charge through the charger than what might otherwise be the case. Because it charges the existing starter/115AH house just fine overnight. My hope is to spend less time dockside, so relying much less on the charger.
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