Rev 1.39 03.10.17
Firmware Version 143 ff.
Dingo 4040P Reference Manual
15
from the battery open circuit voltage can be
determined. A temperature sensor must be
attached for this correction to work accurately.
If you use a temperature sensor, you will get a
more accurate SOC estimate.
A long push on the SOC screen will allow the
SOC to be adjusted to the users best estimate of
the present SOC.
The SOC figure should be treated with caution,
as there are many reasons that it may be
inaccurate:
• The Dingo does not automatically have
knowledge of the whole system. It only
knows what you tell it. For SOC to work
well, it must be measuring all charge (Ah
in) and discharge (Ah out). If the battery
can charge or discharge without the Dingo
knowing, SOC will not be very accurate.
• The effective capacity of the battery reduces
with age. BCAP should be reduced in older
batteries to adjust for this.
• When you set up BCAP on installation, you
should choose your best guess of the batteries
actual capacity when used in the way you
intend to use it. For example, if you think the
battery will mostly be charged and discharged
at around the 20h rate (C/20) you should set
the capacity of you battery at the 20h rate
from the manufacturer’s literature. If you
expect the battery to be used at a variety of
charge and discharge currents, try to estimate
an average.
• Peukerts equation can be used to estimate
the loss in capacity at higher discharge rates.
Correction based on Peukerts equation is not
done automatically because it does not model
discontinuous and variable rate discharge very
well and changes with battery age.
6.5 TEMP (Display External Battery
Temperature and Setting Lockout)
This screen displays the external battery
temperature sensor reading (if attached) or “-”
if it’s not. It is also used to adjust Setting Lockout
(see figure 6.A).
6
Setting Lockout
In some cases it is desirable to restrict the ability
to adjust settings, so as to prevent unwanted
tampering.
To disable settings, long push on the TEMP
screen. The “A” indicator will disappear. A useful
memory aid is to consider that “A” stands for
“Adjustable” on this screen.
To enable adjustment of settings again, long
push on the TEMP screen again. If you have
successfully enabled settings adjustment, the “A”
will reappear while TEMP is showing.
The controller remembers the state of the
settings lockout when the power is disconnected.
6.6 SOLV (Solar Voltage Display)
This screen displays the open circuit solar panel
voltage
The charge current through the SOL terminal
is turned off while the Dingo is displaying this
screen. If the view is left on the SOLV screen, the
charge current will be automatically reconnected
after 18-24 minutes. This is to prevent battery
failure due to lack of charge (failsafe).
6.7 HIST (History display)
Six pieces of data are recorded each day. These
are:
Total Ah IN for the 24hrs. This is a measure of
the energy collected that day
Total Ah OUT for the 24hrs. This is a measure of
the energy used that day.
VMAX - the maximum battery voltage that day.
VMIN -the minimum battery voltage that day,
FTIM - time of day the controller changed to
float mode. ( ‘-’ if it didn’t)
SOC. -the state of charge at the end of the day
These figures are a very good guide to how well
the solar system is performing. The user can
compare the energy collected with the energy
used and get some feedback about the balance
between collection and use.
