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

Product ID: 369080452

Details

Brand
DFROBOT
Colour
Black
Item weight
0.07 Kilograms
Material
Stainless
Voltage
5 Volts

⚡900mA max charge current

🔋MPPT tech for max solar efficiency

🛡️Multi-layer battery & output protection

Description

🔆 Power your future sustainably with smart solar mastery!

COMPACT YET MIGHTY - Slim 33x63mm footprint with premium thermal management ensures efficient, quiet operation anywhere.
DUAL CHARGING FLEXIBILITY - Seamlessly switch between solar and USB charging with up to 900mA current for rapid, reliable power.
PLUG PLAY POWER CONTROL - 5V regulated output with ON/OFF control perfectly tailored for low-power IoT and solar projects.
MAXIMIZE YOUR SOLAR HARVEST - Advanced MPPT algorithm squeezes every drop of power from your 5V solar panel.
SAFE STABLE POWER DELIVERY - Robust protections guard against overcharge, overdischarge, short circuits, and reverse polarity—keeping your battery and devices safe.

The DFROBOT 900mA MPPT Solar Power Manager is a compact, high-efficiency module designed for 5V solar panels and 3.7V Li-ion batteries. Featuring Maximum Power Point Tracking (MPPT) technology, it maximizes solar energy harvest while providing dual charging modes (solar and USB) with up to 900mA current. Its integrated multi-layer protection system ensures battery safety and stable 5V regulated output at 1A, ideal for IoT devices, solar-powered robots, and small solar lighting projects.

Specifications

ASIN	B07MML4YJV
Brand Name	DFROBOT
Color	Black
Customer Reviews	4.4 4.4 out of 5 stars (119)
Item Weight	0.07 Kilograms
Manufacturer	DFROBOT
Material Type	Stainless Steel
Model	DFR0559
Number of Items	1
Number of Packs	1
Part Number	DFR0559
Unit Count	1 Count
Voltage	5 Volts

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