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 and USB Charging

Product ID: 109609022

Details

Brand
DFROBOT
Color
Material
Steel
Product Dimensions
2.48"L x 1.3"W
Voltage
5 volts

⚡900mA max charging current

🔋Optimized MPPT tech for 5V solar panels

🔌Dual solar & USB charging support

$31.95

Duties & taxes included

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Description

🔆 Power your future with smart solar control—never miss a charge!

FLEXIBLE CHARGING MODES - Switch effortlessly between solar panel input and USB charging for ultimate versatility indoors or outdoors.
SEAMLESS 5 V POWER DELIVERY - Stable 5V 1A output with built-in DC-DC converter powers your IoT devices directly—no extra converters needed.
COMPACT INTEGRATION READY - Slim 33×63mm footprint fits snugly into waterproof enclosures and 3D printed cases—perfect for makers and pros alike.
MAXIMIZE YOUR SOLAR HARVEST - Harness up to 900mA charging current with advanced CN3165 MPPT technology for peak efficiency even in fluctuating light.
ULTRA LOW POWER ULTRA RELIABLE - Less than 1mA standby current plus comprehensive protections ensure safe, long-term deployment in remote setups.

The 900mA MPPT Solar Panel Controller by DFROBOT is a compact, high-efficiency solar power manager designed for 5V solar panels up to 10W. Featuring CN3165 MPPT technology, it optimizes energy harvesting and delivers a stable 5V 1A output ideal for IoT devices. Dual charging options via solar or USB, ultra-low standby power, and multiple safety protections make it perfect for remote sensor nodes, weather stations, and maker projects.

Specifications

ASIN	B07MML4YJV
Best Sellers Rank	#37,185 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #29 in Renewable Energy Controllers
Brand Name	DFROBOT
Color	brown\|green\|black\|yellow
Customer Reviews	4.4 4.4 out of 5 stars (122)
Display Type	Software
Item Dimensions L x W x H	2.48"L x 1.3"W x 2.48"H
Item Weight	0.07 kg
Manufacturer	DFROBOT
Material Type	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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$31.95

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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