FAQ

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Battery Selection for Off-Grid Systems
BATTERY SELECTION FOR OFF-GRID SYSTEMS Choosing the appropriate battery for the application is key to long battery life and performance. Once the load i...
Sun, 7 Jun, 2020 at 5:10 PM
Cell Failure Test
To test battery health and determine if a cell may not be performing you may perform a voltage check on all batteries in the string when they beginning the ...
Mon, 22 Sep, 2014 at 5:15 PM
Cold Crank Amps
CCA (Cold Cranking Amps) - the number of amps that the battery can produce at 0 degrees F for 30 seconds.
Wed, 24 Sep, 2014 at 4:42 PM
Deficit Cycling
Rolls batteries have been designed to provide many cycles and therefore long life. This long life, however, is dependent on the correct charging regime.  ...
Tue, 26 Aug, 2014 at 4:22 PM
Discharge Rates
DISCHARGE RATES Discharge and recharge rates should be considered when selecting and sizing a battery bank. Battery manufacturers publish multiple disch...
Sun, 7 Jun, 2020 at 4:58 PM
Grid-Connected Backup
GRID-CONNECTED BACKUP There are two distinct uses for a grid-connected battery bank. The first, and the most common is a power backup system. The purpos...
Sun, 7 Jun, 2020 at 5:11 PM
Ohm's Law - Calculations
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing ...
Sun, 29 Mar, 2020 at 11:43 AM
Operating Temperature Ranges
Battery capacity and battery recharge times are all based on each cell having an electrolyte temperature of 25ºC (77ºF). Temperatures below the nominal 25ºC...
Wed, 3 Jun, 2020 at 7:12 PM
Peukert Number
  Peukert's Formula, T = C / In (or C = T * In)  C is theoretical capacity (in Amp-Hours (AH), equal to actual capacity at one Amp) I is current (in...
Thu, 28 May, 2020 at 2:23 PM
Reserve Capacity (RC)
RC (Reserve Capacity) - the number of minutes that the battery can deliver 25 amps while keeping its voltage above 10.5 volts. Typically a deep discharge ...
Mon, 1 Sep, 2014 at 1:02 AM