if no power is going through the solar panel, can this be set to automatically turn on? In other words does the 5v auto turn on when it gets dark?

It automatically turns on when power is supplied from the panel. In the interim it draws from the battery.

How do i mount the cooling fin? is that what the 3m tape is for? and i it suppose to have direct contact?

That is a good question. I didn't put on my unit and it is working fine.

what is the minimum voltage from solar panel needed? my location is partialy shaded so I get 5.5 in direct sunlight in morning and 3.5 in afternoon

The minimum voltage required from the solar panel is 4.4-6V. In your case, you could connect a 3.7V Lipo battery at the BAT IN side. When the sunlight is not strong, the device can be powered by the lithium battery. When the sunlight is intense, the solar panel can power the device and also charge the lithium battery.

Open circuit voltage is 7.2V operating is 6 volts on my solar panels will this work with solar power manager 5 volt 6 volts max

I had a little trouble with one of mine that had open circuit voltage above 6v. I opted for installing a step down circuit to drop it to 5v and it works like a champ.

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900mA MPPT Solar Panel Controller - Solar Power Manager Module for 5V Solar Panel - Support Solar Charging and USB Charging

900mA MPPT Solar Panel Controller - Solar Power Manager Module for 5V Solar Panel - Support Solar Charging and USB Charging

Product ID: 739906829

Details

Brand
DFROBOT
Color
Item Weight
0.07 Kilograms
Material
Aluminum
Voltage
5 Volts

⚡900mA max charging current

🔋MPPT tech for max solar efficiency

🛡️Multi-layer battery & output protection

Description

🔆 Power your future sustainably with smart solar efficiency!

DUAL CHARGING MODES - Seamlessly switch between solar and USB charging with up to 900mA current for rapid, reliable power.
ROBUST BATTERY SAFETY - Built-in overcharge, over-discharge, and overcurrent protections keep your 3.7V LiPo battery safe and sound.
COMPACT DURABLE DESIGN - Lightweight, thermally managed module built to withstand -40℃ to 85℃ for all-weather reliability.
STABLE 5 V OUTPUT CONTROL - Controllable 5V/1A DC-DC converter powers your low-energy IoT and solar projects with precision.
MAXIMIZE SOLAR POWER OUTPUT - Advanced MPPT algorithm squeezes every drop of energy from your 5V solar panel.

The 900mA MPPT Solar Panel Controller by DFROBOT is a compact, high-efficiency solar power management module designed for 5V solar panels and 3.7V LiPo batteries. Featuring Maximum Power Point Tracking (MPPT) technology, it maximizes solar charging efficiency up to 900mA, supports dual solar/USB charging modes, and offers comprehensive battery and output protections. Its controllable 5V/1A output and rugged design make it ideal for IoT, solar robotics, and low-power renewable energy projects.

Specifications

ASIN	B07MML4YJV
Amazon Bestseller	#723,725 in DIY, Tools & Garden ( See Top 100 in DIY, Tools & Garden ) #1,932 in Solar Power Generation Equipment & Components
Brand Name	DFROBOT
Color	Brown\|Green\|Black\|Yellow
Customer Reviews	4.5 4.5 out of 5 stars (111)
Display Type	Software
Item Weight	0.07 Kilograms
Manufacturer	DFROBOT
Material Type	Aluminum
Model	DFR0559
Part Number	DFR0559
Unit Count	1.0 Count
Voltage	5 Volts

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