Talk:Float voltage

Lead-acid voltages ?

13.5-13.8 Volts for 2.1 Volts cell? Is that for 12 V lead acid battery?--Hmvartak (talk) 04:05, 7 July 2008 (UTC)

Yes, that's the correct range for 6 2 volt lead acid battery cells in series. Tall Girl (talk) 12:52, 6 April 2009 (UTC)

Stub

I have added a stub cat because we need examples of other battery types, e.g. Nickel–cadmium battery. Biscuittin (talk) 00:38, 26 February 2014 (UTC)

correct use of units in example 1 and example 2

I would like to correct how to set the physical units into the formula and set brakets for more clarity. Remark: In engineering as well as in physics, formulas must allow to multiply and cancel down units in formulas as if they were variables. Left side must be identival to right side. If you can't, the formula is incorrect. (even cells can be used as a unit, but not necessarily since "cells" is not a physical unit but a number)

The temperature compensation for a 12 Volts respectively a 6 cells battery at 30°C Temperature is (6 cells) x (30°C-25°C) x (-3,9mV/°C per cell) = (-117mV)

Also I added or will add a formula for the use of farenheit instead of celsius. In farenheit, a battery at 80°F needs (6 cells) x (90°F-77°F) x (- 2,17mV/°F per cell) = (-169mV)

Also i removed the sentence (rounded to the nearest 10mV) because in engineering the use of floating point numbers is obvious.

--AEM (talk) 20:44, 22 May 2014 (UTC)

Float voltage, charge voltage, nominal voltage, etc

Maybe an overview of these voltage terms would be good. If written in one article, they could be explained by relating them to eachother. 195.41.32.83 (talk) 16:18, 4 September 2014 (UTC)

Contradicts other article

Float voltages given for the three types of lead acid batteries contradict with the data given in the wikipedia link http://en.wiki.x.io/wiki/Lead%E2%80%93acid_battery — Preceding unsigned comment added by 178.152.227.175 (talk) 06:55, 23 April 2015 (UTC)

The numbers vary

One example: The Hoppecke OPzV batteries (deep cycle gel) have a float charging voltage of 2.25V. This article says 2.18V. Now I am not an electrical engineer, but I think a difference of 0.07V will have a great effect on the battery capacity and lifespan. I.e. if charging a nominal 100Ah cell to 2.18V when the specifications say 2.25V, then I think there is quite a leap to the 100Ah. On the other hand if charging a cell to 2.25V when designed for 2.18V, the lifespan will be decreased.

Maybe some electrical guy knows more?

192.38.5.154 (talk) 07:34, 5 September 2014 (UTC)

Floating vs charging, and consider sulphation

Floating and charging a lead-acid cell is a process which have disadvantages on both sides. A too high voltage will corrode the positive plate. A too low voltage will sulfate the negative plate. Nor in between is possible, because both phenomena happend, but in practice the battery may be kept on float for a few weeks (2.15-2.2V) and after, several hours voltage is raised to 2.33V per cell to remove sulfation. — Preceding unsigned comment added by 41.67.136.106 (talk) 14:58, 16 December 2014 (UTC)

Trickle Charge vs Float Charge

Need better article content about Trickle Charge vs Float Charge. Seems like Float Charge means applying a constant (top-off) voltage, intended to keep battery fully charged. Trickle Charge seems to mean applying a rather constant (low) current, hoping that this will keep a battery fully charged -- without inadvertently overcharging, which would be bad. Which all leads to needing to understand when Trickle Charging is OK, or not so good... For example, solar chargers for cars that sit for a long time between uses -- what features would make such equipment good or bad for the life of the lead acid battery.-71.174.185.30 (talk) 17:00, 1 May 2017 (UTC)

That's it. The two concepts date from before 'smart' chargers, when a simple fixed limit (and even this was a 'sophisticated' feature) was all that was possible for a sensible budget. Some battery technologies favoured one more than the other.

If the float voltage is temperature compensated, it's still a good way of storing lead-acid batteries. Andy Dingley (talk) 17:13, 1 May 2017 (UTC)