Is there anything that can be done to reduce the quiescent current? I'm measuring about 0.5 mA quiescent current when powering only one of the power supplies (OUT2). The sensor I a...

Hello, can this be used to directly run loads (12v) from solar without a battery connected?

Can i connect multiples 3.7V Li-ion battery in parallel?

Can I install a 3.7v 8000mah battery to the module?

Salem,
I'm asking about the IC controller in the DFR0535 board. You have mentioned that the main controller is the LTC3652. When I tried to find the datasheet, the closest reference I found is the LT3652 from AD (Linear Technology):
https://www.analog.com/medi...

In case of a wrong reference, please indicate the right one.

I will assume that this is a good ref. Can I change the charging voltage by replacing the resistor divider?
In fact, for my project, I use a 6v lead acid battery, and referring to the datasheet this type of battery with this voltage is supported.
On page 7 of the given datasheet, I can find the formula to calculate R1 and R2 in order to adjust the "Battery Float Voltage Feedback Reference" V(FB) and then adjust the charging output voltage.

If I'm in the right way please help me to locate those resistors on your DFR0535 board.
Regards

Can i have multiple 18650 cells in parallel on the battery output?

Charging indicator: When using USB to charge the battery, the CHG USB indicator (red) is on, the DONE indicator (green) is on when it is fully charged, the CHG USB is off, and when no battery is connected, both lights are on at the same time.

Hello DF Robot,

Can the board be powered by cable through the micro USB while being connected to the battery + solar panel?

In case energy is lost from the cable, it automatically goes into battery mode/solar panel mode?

Also, may I use a BMS with more LiPo cells and charge them through the battery port, as long as the BMS charges with 4.2V and maximum of 2A?

Best regards

Hi, i saw that you shared schematic in documents. But im woundering can we get schematic as a file, because i want to import schematic in software like Eagle or EasyEDA, trying to implement this circuit into my circuit. Best regards.

Hey there,
We bought a couple pieces of this product recently. We are currently conducting our preliminary tests, where we connect a controller on the USB OUT, and use this controller to turn on and off another controller which is connected on OUT1. When a HIGH signal is given to EN1, the voltage is around 5V which is all good. However, when given a LOW signal the voltage falls to below zero, anywhere from -0.3V to -1.3V. I believe this would produce problems to our components.
We would like to ask for advice on this issue.
Thanks

Hi there,

I have a question about this product i just purchased.
When I measure the Voltage of my solar panel it shows around 9.2V, but every time I plug the solar panel into the Solar Power Manager the voltage drops to 4.3-5V.
Am I missing something? Cause the input of the solar in should be from 7V to 30V and with the voltage drop its not in that range.

How can I solve this problem?

Is there some kind of interface so that I can query the state of charge (SOC) of the battery? The arduino I am using exports data to Prometheus for the water quality in my farm water tank. I would be extremely useful to know the battery SOC and make this data available for monitoring purposes .

Hi there,
A quick question.
If I have load on and the solar panel is working as well. Does turning off the MPPT will make the protection control for batteries stop working?
I am asking this because the MPPT function in my charge controller was off and during night the voltage dropped to 2.4V and the system was still running. My understanding was it will stop the system to prevent damage. Am I missing something here?
Thank you !

Hi,

Could you please contact [email protected] with your issue?

Recently i have bought the 3 piece of solar power manager. While testing it with the 20W solar panel with the configuration as below pic with MPPT set to 18V , the peak charging current is observed only of .5 A instead of your specification shown 2A. What could be the wrong with my setup? https://uploads.disquscdn.c...

What would be the type of screw? that is compatible with the plastic spacers that are included in the package to be able to place it on a flat surface

M2, M1. M5 cause I accidentally applied to much power to my board and burned several components

Hey,
The power manager can provide up to 2A charging current to 3.7V Li battery with AC adapter (within 30V) .

Update on this problem. Turned out I had a bad Voltmeter. The voltage is fine. I'll continue investigating the issue, but it does not appear to be your problem. Thank you for your help!

Recently I bought 100 of your Solar Power Manager 1.0 boards for resale and incorporation into other products.

I heard from a customer that the DFROBOT Solar Power Manager 1.0 Board output on the regulated 5V output that it was not supplying 5V but was supplying 5.7V and his Raspberry Pi would just continuously reboot.

I took two DFRobot Solar Power Manager 1.0 Boards and measured the 5V Regulated output (under load and not under load) and also got 5.5V - 5.7V. This is clearly out of spec for any 5V device (5.0V _/- 5% is a maximum of 5.25V).

Are all your Solar Power Manager 1.0 boards exhibiting this problem? This is clearly not correct and will damage some 5V devices.

I need resolution to this problem.

Best regards,

John

When you used 18V input this device, you should put MPPT to 18V. The 18650 nominal voltage of a single section is generally: 3.7V, the 18650 can be charged by externally connecting the voltage of 4.20V-4.3V or 4.35V,Charging time (minutes) = battery capacity *1.2 / current (mA) * 60, assume that the charge loss is estimated to be 20%, if in bright sunlight you need 2 hours and 47 minutes to complete charging the 18650.