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Unread 09-04-2008, 07:12 PM   #11
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Default Re: charge guage

It sounds like your gauge is working. Do you have a voltmeter to check it against? Are you sure it is coming back to the SAME place every time? It should register a little less each time you use it significantly till it finally shows recharge. The led is simpler for some as there is no gauge just LEDs?
I recently put the same gauge on a cart and am checking it closely to see where the gauge reads when the pack is between 36.5 & 37 volts. (the point I want to begin recharging).....
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Unread 09-05-2008, 09:00 PM   #12
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Default Re: charge guage

The way you read the guage is not just sitting there. Its when you push the pedal down is when it registers the amount of voltage left [how much load is being drawn from the batteries] before a recharge. The way a battery works is a chemical reaction when you have a load the acid is drawn into the plates which make power and when you charge the battery the acid is drawn out of the plates . The voltage is 2.1 volts per cell a 6 volt battery is 6.3 volts at full charge acid ph is 12.65 per cell at full charge.

A discharged battery is 5.0 volts 0 amps . 0 amps is because most of the acid is in the lead plates which leaves the battery voltage at 30 volts on a 36 volt system. When charged the voltage is 37.8 volts on a 36 volt cart. and the amperage is 400 -500 amps per battery depending on the battery CA capacity. [ CA = cranking amps at 32 deg. -- CCA = cold cranking amps at 0 deg.] And when the battery gets down to 5 volts it can freeze on a cold day because the acid is absorbed in the lead plates and there is mostly water in the battery.

Hope this helps to understand the battery system.
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Unread 09-05-2008, 09:18 PM   #13
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Default Re: charge guage

It is quite informative but, I was always taught that a lead acid battery would cycle many more times ( longer life) if drawn down only 20% and recharged. For a 6v battery that is 6.0v and recharge.
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Unread 09-05-2008, 11:45 PM   #14
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Default Re: charge guage



Total discharge every load you're replacing lead in ~100 cycles.
scottyb method you'll get +10x that.
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Unread 09-06-2008, 09:53 AM   #15
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Default Re: charge guage

Scottyb

Your right on 20% but a 6 volt battery is 6.3 volts at full charge and discharged is around 5 volts thats about 20 % off of full charge.
The perpose of golf cart batteries are because the lead plates are thicker than whats in an automotive battery thats why they can cycle so much better in other words the golf cart battery plates can heat up more without warping and shorting out but a car battery plates are thinner they will warp if the current being drawn out is to long a cycle and then short out. a 12 volt battery charged is 12.6 volts at full charge and 10.5 volts at full disharged. anything disharged more will shorten the life of the battery. and you dont want a battery to ever get over 125 deg. hot when charging or discharging because that will cause damage to the lead plates. But it is say to pull your 6 volt batteries to 5.0 volts and recharge. Now on charging the more amps you put in the battery to charge the more heat you get the risk of a damaged battery 125 deg. is max for a battery thats why a 5 amp charger is great to charge any battery with yes it takes longer but the battery life will be longer.

You should charge your batteries up after you ride your cart around and it doesnt matter if it is a short or long ride because that will keep the sulfation of the batteries thats the white gray looking stuff on the plates when you look in the battery cells that acid that has crystalized because the battery was not always keeped full charge .
and if your cart is not used the battery will always lose about 1 volt a month even more in hotter weather thats why its always good to keep a small charger on the batteries to keep them up .
The acid is always being absorbed in the lead and eventualy eats the lead up thats why you want to always keep full charge on the batteries.
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Unread 09-06-2008, 12:50 PM   #16
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Default Re: charge guage

Thanx to wkola for the info on reading the gage. I kinda' thought that the way to read it is when the batteries were under load as that is when the gage actually moves from full charge to closer to the red discharge section of the gage. I always thought that the batteries should be charged after every use but the local dealer said to not worry about it and to only re charge them after several runs.....every week or two. It does make perfect sense tho to charge them often so that they don't get too hot while re charging them and therefore extend battery life.
....And to 'pggroves', Thomas Jefferson is right on about the second amendment!
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Unread 09-06-2008, 10:54 PM   #17
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Default Re: charge guage

wkola, what you said is all good theory and practice. I just question the LOW voltage readings you are giving us?
I am recharging my 48v pack at 48.5 or 49.0 At this amount of discharge I can feel the loss of power on any incline I am familiar with. We have alot of hills. The pack will easily come up to 51.5 or even 52 volts. when the amps are replaced. These are less 1 yr old T875s.
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Unread 09-06-2008, 11:47 PM   #18
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Default Re: charge guage

Scottyb an 8 volt battery should be 8.4 on a full charge thats 2.1 volts per cell. a 48 volt cart is 50.4 volts at full charge at full discharge thats 40.3 volts that as low as it will go on good batteries. when voltage drops so does the amps. In other words when you start on a full charge 50.4 volts you have peek amps as you ride the voltage starts to drop and so does the amps that are stored in the batteries until you reach 40.3 volts which should be nearly 0 amps left in the battery. Amps is like gas when you charge up your putting gas in the tank. Get a battery hydrometer at the part store and check your batteries after a full charge you should read 12.65 gravity by keeping that pacific gravity you will have all the power your batteries can develop without damaging them and the will last you 7 to 8 yrs or better .
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Unread 09-07-2008, 12:07 AM   #19
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Default Re: charge guage

I don't know where to start, really. What should I do with my batteries which read 8.5 and 8.7 ? My hydrometer (and I didn't buy it today) tells me they are good? I don't think your batteries are going to last very long if you draw them down to the levels you are suggesting. At 8.0 the battery should be recharged IMHO.
BTW is this your thread from 6 months ago?
Need Help on cart info
I don't know much about carts but those that I think do ...disagree. GOOD LUCK
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Unread 09-07-2008, 09:34 AM   #20
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Default Re: charge guage

scottyb I have a business that I have refurerbished and conditioned batteries for nearly 15 yrs. a very good business. I do know what Im talking about in the battery line. But yes Im new to golf carts I sold my business last year and have a lot of time on my hands just monkey around since the boating is bad in north georgia. for 2 yrs. now.

And for your battery reading 8.5 8.7 is that right after a charge or do you let it set for 10 or 15 min then take a reading because if not you have a little to much acid in the batteries try to put some distilled water in to dillute it to 12.65 on the hydrometer.

Now if the reading is low then add some acid which is 12.65 gravity but you will need a stronger mixture of acid say around 13.00 to 1400. to get it to the 12.65 gravity. just remember the battery companies try to make the acid in the battery a little to strong so it will eat the lead plates up and they get to sell you a new battery in 3 to 4 yrs. and pro rate warranty it to where your paying almost for the battery price for what you gave before easy money for them again. But if you keep the battery maintained right water acid gravity and such it should last for 7 to 9 yrs.
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