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Old 11-09-2013, 11:55 AM   #31
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Just a comment on the charger voltage. I saw another person who does a lot of boondocking mention that golf cart batteries like 14.8 volts for charging.
http://popupbackpacker.com/2014-mila...-solar-system/
Anyone else hear this info before?
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Old 11-09-2013, 12:39 PM   #32
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I have not heard of any different number for 6 volt battery banks. I have heard number as high as 16 volt for charging 12 Volt battery. I like around 14.2V to 14.4V. The higher the voltage the faster the charge and the shorter the battery life. If I was charging at 14.8 volts, I would watch fluid level and feel the battery to see if it is getting warm and if neither is happening I would think all was good.

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Old 11-09-2013, 01:36 PM   #33
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Some types of batteries like a little higher voltage. I'd have to dig out my manual again, but I know my charger has settings for AGM and gel and I believe it uses 14.8 as a setpoint instead of 14.4 . I think it does the same in cold weather mode.
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Old 11-09-2013, 03:05 PM   #34
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Quote:
Originally Posted by BigBaron View Post
Just a comment on the charger voltage. I saw another person who does a lot of boondocking mention that golf cart batteries like 14.8 volts for charging.
http://popupbackpacker.com/2014-mila...-solar-system/
Anyone else hear this info before?
yup. My Trojan T-145 are supposed to charge at 14.8V, but only during the bulk portion of the charging cycle. Then 13.8V for absorption, finally 13.2V for float.
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Old 11-09-2013, 05:19 PM   #35
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Quote:
Originally Posted by RPAspey View Post
yup. My Trojan T-145 are supposed to charge at 14.8V, but only during the bulk portion of the charging cycle. Then 13.8V for absorption, finally 13.2V for float.
Actually the absorption voltage should be the same as the bulk charge, with decreasing amperage to hold it there till the charging rate drops to a low rate (like 2-5 amps) whence to will go to float.

I have not heard of such a low abs voltage, that more like a high float.


Hmmmm?
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Old 11-09-2013, 05:30 PM   #36
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Don't forget the temperature of the battery itself, which effects the charging voltage at all stages. None of the OEM (or PI for that matter) have temperature compensation, so normally keep the voltage down a bit to account for this.

Really good external charges can have temp comp and different setting for different batteries..

Here is one for example.

New Xantrex Truecharge 2 20amp Battery Charger 3 Bank 12v Temperature Compensated Charging
by Xantrex

Temp vs voltage curve in this link.

http://www.tekrispower.com/pdfs/xant...20Charging.pdf
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Old 11-09-2013, 06:43 PM   #37
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Batteries in a parallel banks should always be of the same voltage and amp/hr. rating.

Two six volt batteries across a 12 volt battery in parallel is just a bad idea.

Just get two identical 12 volt batteries if you want to double your total amp rating of the bank.

Internal resistance of a battery does matter.
Especially when hooked to a charger.
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Old 11-10-2013, 11:23 AM   #38
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Originally Posted by garbonz View Post

Actually the absorption voltage should be the same as the bulk charge, with decreasing amperage to hold it there till the charging rate drops to a low rate (like 2-5 amps) whence to will go to float.

I have not heard of such a low abs voltage, that more like a high float.

Hmmmm?
you're right. I'm not sure why I said that. (I'm getting old I guess)

After checking my notes, its 14.8v until the current drops to 1.04A or times out at 3 hours, then go into float at 13.2v. According to Trojan, daily charge is 14.8, absorption is 14.1-14.7, float is 13.2, and equalize I'd 15.5.
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Old 11-11-2013, 12:39 AM   #39
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This is great. Everything you ever wanted to know about batteries, but were afraid to ask. LOL
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