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dc2069afb
DEMO MANUAL DC2069A
1. Connect a 12V lead acid battery to the V
BAT
connector,
making sure that the polarity is correct. A suitable battery
size is a 150Ah 12V deep cycle sealed lead acid battery,
but also smaller 12V lead acid batteries can be used
for testing the charging functions. Use a short battery
cable that is rated for 15A or higher.
2. Connect the solar panel to the PANEL IN connector,
making sure that the polarity is correct. A suitable panel
is a 250W 60 cell solar panel, but any panel with 36 to
72 cells (54V maximum open circuit voltage) can be
used.
3. Point the solar panel towards sunlight and monitor
the MPPT charger function under different conditions,
using ampere meters and voltmeters and other test
equipment as needed.
4. The charger will also work with a DC power supply
connected to the DC IN connector. Disconnect the solar
panel before turning on the DC supply. (The charger
can operate from both power sources simultaneously.
However, the MPPT function will be disabled while there
is DC voltage on the DC IN input, so the solar panel
may not be operating at its maximum power point if
the charger is also powered from the DC IN connector.)
A suitable supply is a 24Vdc supply that can deliver at
least 12A, but any DC power supply that has an output
voltage in the range 10V to 54V and is able to deliver
250W power or 12A current can be used for evaluation.
5. Note that the charger will not start unless the output
voltage is above 4.5V. This means that if the battery
is replaced by an active programmable load during
evaluation, a small power supply needs to be connected
across the load to start the charger. A small 9V battery
with a diode in series works fine.
6. Read the LT8490 data sheet for more detail on the
function of the circuit and how to change the charge
algorithm.
Quick start proceDure
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