What does the dongle use to detect temperature?

I fear you may both be wrong. This device contains a temperature sensor built in. It can also display the temp from the victron sensor when connected appropriately.

why would I buy a victron product if I need an $80 serial cable to communicate with it?

You don't need an $80 serial cable, the Bluetooth device is what costs money. It uses an ethernet cable.

Will this allow me to upgrade firmware in my multiplus via my phone cellular data?

No. To upgrade and make critical settings you must plug into you PC. I think this is done for safety reasons.

Can I have this plugged in and use at the same time as the digital muilticontrol panel? Or is it one or the other?

I also have the Digital Multi Control 200/200A GX installed and the DMC takes over power on/off control. The Victron Connect app accessing the BT Smart Dongle still works, however with many reduced features. Mostly just the Overview screen in Victron Connect and the Details view is limited. It actually displays in Victron Connect the message "VE Bus Smart Dongle is running in secondary mode because there is a remote control panel connected to the VE bus. In secondary mode only a limited number of values are available"

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VE.Bus Smart Dongle (Bluetooth)

Product ID: 107234124

Details

Color
Blue
Brand
Victron Energy
Product Dimensions
3.94"L x x
Material
Plastic
Item Weight
3.2 ounces

📱Seamless VictronConnect app control

🔋Bluetooth-enabled inverter monitoring

🌡️Integrated voltage & temperature sensing

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2134 DH

Duties & taxes included

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Sold byAmazon MoroccoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power up your smart life with seamless Bluetooth control!

DUAL FUNCTION SENSOR TECH - Accurately tracks voltage and temperature to optimize performance and safety in real time.
COMPACT LIGHTWEIGHT DESIGN - Sleek, portable form factor (under 0.1 kg) fits perfectly in tight spaces like caravans and yachts.
REAL TIME BLUETOOTH MONITORING - Stay effortlessly connected to your Victron inverter/charger via Bluetooth for instant system insights.
APP CONTROLLED POWER MANAGEMENT - Adjust input current limits and switch modes remotely with the intuitive VictronConnect app.
IDEAL FOR MOBILE OFF GRID LIFESTYLES - Perfect for professionals on the move—monitor your power system without bulky control units.

The Victron Energy VE.Bus Smart Dongle (Bluetooth) is a compact, dual-function device that enables Bluetooth monitoring and control of Victron inverter/chargers. It also senses voltage and temperature, providing critical data for optimized power management. Compatible with a wide range of Victron products, it integrates with the VictronConnect app for remote operation, making it ideal for mobile setups like caravans, yachts, and motorhomes where space and simplicity matter.

Specifications

ASIN	B07FCV43LQ
Best Sellers Rank	#75,594 in Automotive ( See Top 100 in Automotive ) #139 in Power Inverters
Brand Name	Victron Energy
Color	Blue
Customer Reviews	4.6 4.6 out of 5 stars (458)
Date First Available	January 22, 2019
Included Components	Victron Energy VE.Bus Smart Dongle (Bluetooth)
Item Dimensions LxWxH	3.94 x 1.18 x 2.36 inches
Item Package Dimensions L x W x H	4.88 x 2.52 x 1.69 inches
Item Weight	0.08 Kilograms
Manufacturer	Victron Energy
Material	Plastic
Model Name	Victron Energy VE.Bus Smart Dongle (Bluetooth)
Package Weight	0.08 Kilograms
Part Number	NT-1066
Size	One Size
Suggested Users	unisex-adult
Warranty Description	Warranty

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