Installation Guide

• Specific Gravities readings at full charge vary significantly, (greater than .030)

• This may be caused by multiple parallel strings of batteries in a bank,

which often result in charge imbalance. It is not recommended that a

system exceed 3 strings of batteries connected in parallel.

• Charge voltage settings may be too low. Verify they meet Rolls

recommended charging parameters for Flooded or AGM models.

• An increase in Absorption charge time may be necessary.

Increase in 15 to 30 minute increments.

• Indicates there may be failing or dead cell(s) in the battery bank

causing a charge imbalance.

• While charging, the battery bank does not reach Bulk voltage setting.

• If the system is not reaching bulk voltage the charge voltage and/or Amp output

to the battery bank may be too low. Verify that these meet Rolls recommended

charging parameters for Flooded or AGM models and that charge output (Amps)

is sufficient to meet the capacity of the battery bank. To ensure sufficient

charge, output should be approximately 10% of the Amp Hour capacity of the

battery bank. (Ex1200AH Battery Bank = 120 A charge output)

• Indicates that DC loads running on the system during the charge cycle may be

reducing the charge output to the battery bank, slowing down the charging process.

• When performing a corrective equalization, the battery bank does not reach

equalization voltage.

• Before doing an EQ you should do a full Absorb Charge prior to initiating an EQ charge.

• Indicates the charge output may be too low. Verify the voltage and charge

output meet Rolls recommended charging parameters.

• Indicates the possibility of a failed or dead cell which may be causing

resistance. Verify specific gravity of each cell and voltage reading for each

battery in the bank.

• Battery(s) temperatures are very high.

• If at or near 51˚C (125˚F) shut off charge and allow batteries to cool.

• If a single battery or cell in a string is hot, this may indicate a cell failure or

short. Verify specific gravity for all cells and take voltage readings from

each battery and perform a load test to identity any cell failures and verify

proper cell operation.