Installation Guide

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Setup

• 03D Absorb Done (Time, Amps, SOC) – This setting identiﬁ es whether time, amps, or SOC

are used to determine when the second stage of battery charging (Absorption) is ﬁ nished. The

charge cycle transitions to the ﬁ nal charge stage (03G Final Charge Stage) afterwards. Ab-

sorption is the second stage of the charge process that attempts to fully charge the batteries.

Note: If “CC/CV Controlled” displays on this menu’s screen, you will not be able to adjust the

settings as “CC/CV” has been selected as the battery type from the 03C Battery Type menu.

Info: If the Absorption stage is short or terminated, the batteries may not receive

a full charge. In contrast, if the Absorption stage is too long the batteries may be

overcharged. Either scenario may lead to damage to the batteries. Contact your battery

manufacturer to ensure the best charge settings are used for your type of batteries.

◊ Set Absorb Done Time – Absorb Done Time is used when a speciﬁ c time is determined

to be best for ending the Absorption stage. When using time, the battery bank size typically

determines the length of the Absorb Done Time setting. The larger the battery bank, the lon-

ger the absorption time needed to ensure a full charge to the batteries. Taking speciﬁ c gravity

readings of the batteries and adjusting the absorption time may be needed in order to obtain

the appropriate absorb time for your battery type and battery bank size. See Table 3-2 to help

select the Absorb Done Time setting based on the AHr capacity of your battery bank.

Default setting: 2.0 Hrs

Range: 0.1-25.5 Hrs

Info: This setting’s range is dependent on the inverter’s compatibility level (Appendix

A). Inverters with a compatibility level of 4.0 or greater, the available range is 0.1-25.5

hours. However, if the inverter compatibility level is less than 4.0—even though you

can adjust the setting from 0.1-25.5 hours—the available range may not be recognized

by the inverter and will cause the charger to revert to the default setting of 2.0 hours.

◊ Set Absorb Done Amps – This setting is used when the DC amperage supplied to the

batteries (also known as “return amps”) is used to determine when the batteries are fully

charged. During Absorb charge mode—as the battery charges—the current required by the

battery decreases. When the return amps decreases below the Absorb Done Amps setting

for two minutes, the charger transfers from the Absorption charge cycle to the ﬁ nal charge

stage (see 03G Final Charge Stage). Most battery manufacturers use a speciﬁ c formula to

determine the return amps that indicate a full charge for their particular type of battery.

The formula used by most manufacturers to absorb the batteries is C/20, where C=Battery

Bank’s Total Amp Hours. Basically, they take approximately 5% of the total battery bank size,

and consider the battery totally charged when the charger’s return amps drops to this level.

Continuing to charge past this level may possibly overcharge the batteries. Check with your

battery manufacturer to ﬁ nd out what the correct return amp settings are for your batteries.

Default setting: 20 ADC

Range: 0-250 ADC

Info: Setting the Absorb Done Amps value to 0 (zero) keeps the charger in the Absorb

charge mode until the 03F Max Charge Time setting is reached (if no BMK installed).

Info: When using Absorb Done Amps, the charger stays in the Absorption charge mode

for a minimum of two minutes—independent of the actual Absorb Done Amps setting.

Info: If DC loads are connected directly to the batteries and a Magnum battery monitor

is not installed, the Absorb Done Amps setting should not be used. To charge the

batteries—plus run the DC loads—the charger must increase the current delivered to

the battery bank. This may result in overcharging the batteries since the return amps

reading will be skewed by the DC loads.

Info: It is highly suggested that you install a battery monitor if the Absorb Done Amps

setting is used. If a battery monitor is not installed, the Absorb Done Amps setting

relies on the METER: 01B DC Amps value to determine when to transfer out of the

Absorption charge mode. This is the most accurate DC amperage measurement.