12
Full Chrg Amps
In addition to Voltage, the user can set the Charging Current at which the battery is considered fully charged. The value is a percentage between 0.0 %
and 10.0 % of the battery’s set Amp-hour capacity. This value should be set to 0.2% higher than the End of Absorption Amps. That is the current where
the battery charger switches from Absorb to Float stage. Values are typically 2% for AGM and 3% for Lead Acid. As a battery ages, this percentage may
need to be increased. This is automatically set by CZone.
Charge Eff.
This setting is for indicating the battery’s percent charge efficiency. The value may be set between 0% and 100%. The user can adjust the charge
efficiency up or down depending on the age and/or type of battery that they are using. AGM Batteries tend to be much more efficient than Lead Acid
Batteries. If the M2 meter indicates 100% before the charger is done with its bulk charge then the efficiency is likely too high. Try decreasing it a couple
percent. If the M2 meter never indicates full charge then efficiency is likely too low. Try increasing it a couple percent. This is automatically
set by CZone.
The charge efficiency can be calculated as follows:
1. Set the
Charge Eff
. Value to 100%.
2. Discharge the battery somewhere between 25% to 50%.
3. Check the SoC summary screen and note the
Ah Used
value (it will be a negative number). This is
Discharge Amps
.
4. Charge the battery using a 3-stage charger.
5. When the charger goes from Absorption to Bulk, the battery is considered fully charged.
6. Check the SoC screen again and note the
Ah Used
(it will be a positive number). This is
Charge Amps
.
7. The new Charge Efficiency value is calculated by
Discharge Amps/Charge Amps
.
8. Set the
Charge Eff
. value to the value above
For example, if we had a 100 Ah battery, we would remove 50 Ah at roughly C/20 (5 Amps for 10 hours). We would then charge the battery and when we
transition to float, we might see 4
Ah Used
. So the charge efficiency would be 50/(50 + 4) or 92.5% efficiency.
Temperature
Specify the lowest temperature that the batteries will be exposed to. As temperature drops, the effective capacity of batteries also drops.
The M2 calculates the battery capacity based on this worst case temperature. This number could be adjusted seasonally to provide better accuracy
SoC Volt. Sync
This setting allow the M2 to estimate the current State-of-Charge after the battery has rested for a period of time. In certain situations where small
charges are affecting the voltage reading (some solar installations would do this), the synchronization will estimate the SOC incorrectly. In that case, turn
this feature off.
Shunt Value
The M2 is shipped with a single 500A/50mV shunt (the ratio is 10000:1). The shunt value assumes that the full scale shunt output voltage is 50 mV. To
use a shunt with a smaller output voltage use the following formula: Shunt Value = (New Shunt Ratio) / 20. For example to use a 400A/20mV shunt
(Note: 20mV = 0.02V), you would set Shunt Value to (400A/0.02) /20 = 1000A.
Zero Shunt
Menu->Setup->DC1 Setup->Zero Shunt
. To zero out the shunt, connect both of the current sense wires to the negative bus bar side of the shunt.
Then press the
Reset
button on the M2 Meter to confirm the action.
State-of-Charge (SoC) Cycles
Menu->Setup->DC1 Setup->SoC Cycles
. The SoC Cycles option allows the user to reset the battery’s recorded SoC cycles to 0. To do this, scroll to
and press
Select
on SoC Cycles. Text will appear asking to confirm or cancel the reset request. Press
Yes
to confirm or
No
to cancel the action.
State-of-Charge (SoC) Default Settings
To reset the battery’s State-of-Charge settings to the default values, press
Select
on SoC Defaults. Text will then appear asking to confirm or cancel the
reset request. Press
Yes
to confirm or
No
to cancel. The following changes will occur after a reset:
1. SoC Cycles will be reset to 0
2. SoC is Reset to 98%
