Schumacher INC-14825A Battery Charger User Manual


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CALCULATING CHARGE TIME10.
The Hydrometer or Electronic Method
Tondthetimeneededtofullychargeyourbattery,determinethe
battery’s charge level with a hydrometer or electronic Percent-of-Charge
Tester. The following table will help you convert hydrometer readings to
percent of charge values.
SPECIFIC GRAVITY PERCENT OF CHARGE PERCENT OF CHARGE
NEEDED
1.265 100% 0%
1.225 75% 25%
1.155 25% 75%
1.120 0% 100%
WhenyouknowthepercentofchargeandtheAmpHour(AH)ratingof
your battery, you can calculate the approximate time needed to bring your
battery to a full charge.
To convert Reserve Capacity to Amp Hours, divide Reserve Capacity by 2,
and add 16:
Example:
Amp Hour Rating = Reserve Capacity + 16
2
NOTE: The Reserve Capacity can be obtained from the battery
specicationsheetortheowner’smanual.
To calculate the time needed for a charge:
Findthepercentofchargeneeded.(Abatteryat50percentchargethat1.
willbechargedto100percentneedsanother50percent(.50)).
MultiplytheAmpHourRatingbythechargeneeded(.50)anddivideby2.
thechargersetting(17ampsaverage).
Multiply the results by 1.25 and you will have the total time needed, in 3.
hours, to bring the battery to full charge.
Add an additional hour for a deep-cycle battery.4.
Example:
Amp Hour Rating x % of charge needed x 1.25 = hours of charge
Charger Setting
100(AHRating)x.50(chargeneeded) x 1.25 = 3.676 hours
17(ChargerSetting)
100 x .50 x 1.25 = 3.676
17
You would need to charge your 100-Ampere Hour Battery for a little more
than 3 hours using the above example.
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