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dc2069afb

DEMO MANUAL DC2069A

makingsurethatthepolarityiscorrect.Asuitablebattery

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,theMPPTfunctionwillbedisabledwhilethere

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