Balmar SG210 Руководство по установке и эксплуатации - Страница 17
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State of Health Calculations
The calculation of State of Health occurs over one or more charge cycles. In
this context, the term "Charge Cycle" has a specific meaning:
1. Fully charge the batteries. If you are starting with full batteries, then do a
short discharge of a few Ah, and then begin charging.
2. Allow the batteries to rest at the full charge state for a brief moment. At
this point, a + sign on the SoC screen should appear, indicating that the
SG200 has reached Charge Termination. If this does not happen, either
the initial discharge was too short, no rest period happened, or the Charge
Parameters have been modified from the defaults and are not allowing
charge termination to occur
The State of Health value may adjust during several charge cycles. When the
SoH value has stabilized, this can be taken as a sign that the value is correct.
Under certain circumstances, it may be desirable to obtain a SoH value with-
in a single charge cycle. This is usually possible, if the following procedure is
strictly followed.
3. Obtain CHARGE TERMINATION as previously outlined
4. Discharge the batteries to 37% SoC or lower
5. Allow the batteries to rest at 37% SoC or lower for at least 65 minutes.
Charge the batteries to reach Charge Termination again.
6. Disconnect all loads (Except for the SG200) and allow the batteries to rest
for at least 35 minutes.
This process should be considered a shortcut, and not the standard method
for obtaining a SoH value. While we have tested this procedure with many
batteries, we cannot guarantee that it will work with every installation and
battery configuration.
Changing Charge Termination Values
Each battery chemistry has default values for both Charge Voltage and Taper
Current. These values should only be changed if:
1. Charge Termination is not occurring.
2. Charge Termination occurs early, meaning that the charging source
continues to charge after Charge Termination has been reached, and
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this "Extra" charging is at least 1% in Ah of the total battery capacity. This
should only be considered an issue if the Charge Termination happens with
significant charge still occurring afterwards.
In either case consider raising the Taper Current in small increments, the target
should be 2-4% of the battery capacity in Ah. It is unlikely that the CHARGE V
needs to be changed, but if it does, consider lowering the CHARGE V in small
increments. Don't perform both changes at the same time, try the Taper Cur-
rent first.
NOTE: LiFePO
users will often not charge their batteries fully, leaving
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one or more % of capacity unused. If you do this, you must ensure
that you still reach charge termination. If you leave a percentage of
the battery uncharged, the SoH will be lowered by that amount. Do not
attempt to compensate by artificially lowering the design capacity.
NOTE: Changing these values can completely stop the calculation of
SoH if the Charge V is set too high, or Taper Current too low, or both.
NOTES
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