> Temperature vs. Capacity - Flooded Lead Acid Batteries
Modified on: Fri, 29 Aug, 2014 at 12:21 PM
Electrolyte : Here is a copy of info from: http://www.trojanbattery.com/tech-support/faq/
> 9. Can a flooded battery freeze?
The only way that a battery can freeze is if it is left in a state of partial or complete discharge. As the state of charge in a battery decreases, the electrolyte becomes more like water and the freezing temperature increases. The freezing temperature of the electrolyte in a fully charged battery is -92º F (-69º C).
>At a 40% state of charge, electrolyte will freeze if the temperature reaches approximately 16º F (-9º C).
This is a copy of info at http://support.rollsbattery.com/support/solutions/articles/10376-deficit-cycling
> Deficit Cycling
>Modified on: Tue, 26 Aug, 2014 at 4:22 PM
>Rolls batteries have been designed to provide many cycles and therefore long life. This long life, however, is dependent on the correct charging regime.
To fully charge a lead acid battery, more ampere hours must be returned to it than have been drawn from it. This is not always possible in Renewable Energy applications as systems may rely solely on the Sun and Wind without backup power (generator/charger). In these instances the battery may not receive a full charge before it is discharged again. If this deficit is not corrected the battery will eventually sulphate and its capacity will deteriorate. To lessen these symptoms it is essential the battery is returned to a fully charged state at least once a month. The battery’s state of charge (SOC) can be checked using a combination of its voltage and specific gravity.
>If the batteries do not respond to normal charging, a course of equalization* will be required. This is in essence controlled overcharging in order to return the acid back into the electrolyte. Given that the acid is more dense than the water, no noticeable increase in the specific gravity will be noted until the gassing voltage has been reached (2.4VPC) and the two start to diffuse.
>NOTE: Hydrocaps must be removed during equalization.
14:50 Automatic update to version 4.4 and MPPT firmware to 1.3
The update created an anomaly in that the restart created a new day and thereby pushed back all the history by a day. So I have saved the data and cleared the history. So today's history is missing all data before 14:50
**15th Mar** 10:25 Morning Low 12.47 I must discover when the low reading is taken as yesterday's now reads 12.32 which was probably just before I kipped out and switched of inverter, computer and lights, but by mistake - left the rooter on all night
**14th Mar** 10:58 Morning Low 12.74 I haven't properly discovered when the low reading is taken a) just after midnight or b) as soon as the first light is recorded.
**13th Mar** Charging all day whilst using inverter Y=1.47Wh??
**12th Mar** Morning Low 12.70 charging ??
**11th Mar** Morning Low 12.66 charged Y=570Wh
**10th Mar** Morning Low 12.31 charged Y=760Wh
**9th Mar** Morning Low 12.50 charging Y=170Wh
**8th Mar** Morning Low 12.59 charged Y=1.550KWh Inc 3 and 1
**7th Mar** Morning Low 12.62 charging :: 09:44 15.46v connected Batts 3 and :: 09:52 V=15.44 set Abs to 15.64v
**6th Mar** Morning Low 12.32 charging :: 09:40 14.6v at 13.6a
**5th Mar** Morning Low 12.51 Little charge and incubator on all day :: Lowest V=12.24
**4th Mar** Low 12.35 Charge (Yield = 880w some to Batts 3 and 1) (incubator on all night till Noon)
**3rd Mar** Low 12.39 (incubator on all night till Noon)
**2nd Mar** Low 12.36 (incubator on all night till 10am)
**1st Mar** Low 12.47 (incubator on all night till 10am)
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