Technical Manual

64 D C U M a i n t e n a n c e a n d O p e r a t i o n M a n u a l
Non-winter SoC Threshold = 20%
Defaults to 20% and never should be less than 20%. This is the threshold at which the DCU
will enter low power mode outside the winter start and stop days. This value is
automatically calculated based on GPS-obtained coordinates.
Winter SoC Threshold = 25%
Defaults to 25% and never should be less than 20%. This is the threshold at which the DCU
will enter low power mode within the winter start and stop days. This value will normally
be greater than the non-winter SoC threshold. This is value is automatically calculated
based on GPS-obtained coordinates.
Winter Start Day = 1(day of
year)
Start day in which the Winter SoC threshold will become active. This value is
automatically calculated based on GPS-obtained coordinates
Winter End Day = 26(day of
year)
End day in which the SoC threshold will revert to the Non-Winter threshold settings. This
value is automatically calculated based on GPS-obtained coordinates.
Full Power Consumption =
4000(mW)
Defaults to 4000mW. Value can be changed if standard DCU 2+ hardware or traffic
changed. This is the average power consumption of the DCU electronics in normal
operating mode.
Low Power Consumption =
450(mW)
Defaults to 450mW. Value can be changed if standard DCU 2+ hardware or traffic
changed, but this value should not need to be changed for the DCU 2+. This is the
average power consumption of the DCU electronics in low power operating mode, alias
“sleep mode”.
Measurements Note that only some of these are available with the 9985H board
Battery SOC = 90%
State of Charge of the battery. Valid range is 0 to 100%. This value is what is compared to
the Freeze Protection settings to determine low vs, normal operation mode. For AC
systems, the SoC should be steady and above 89%. For solar DCU 2+, the SoC will increase
when sunlight is available and will discharge when sunshine is not available.
Power Management Mode:
Normal Operation
Denotes the current state of the DCU. Will be Normal or Low/Suspend Mode. (Battery
State of Charge above threshold)
Battery BSR = 0.060Ohm
Battery Series Resistance. The higher the value, the lower available capacity of the
battery. This value can be viewed over time to determine a failing battery.
Battery Voltage = 13.10V
The OC battery voltage. In a DCU 2, this value needs to be over 12V for normal operation.
In the DCU 2+, the SoC value is a better indication of battery charge.
Input Voltage = 19.13V
Power Board input DC voltage (Vin). The capable of handling voltages up to 25VDC for a
typical solar panel. AC circuits provide ~19VDC to this input.
Module Voltage = 19.10V
Voltage provided to load (Vsys) should be near battery voltage during discharge and near
input voltage when charging.
Battery Current = 01.27A
Battery Current (Ibat) is positive when the battery is charging and negative when the
battery is discharging.
Field Example Description