Whats the output and thermal limit?

Output is ambient available heat+watts of power draw, approx 3btus per watt. Upper limit is 180° before you start to do permanent damage. Lower is-80 going below -80 even with the unit off is reported by some people to permanently damage. If they get too hot they permanently lose capacity, if they get too cold I've had them split. Although these particular ones I have been using to heat, from a high ambient so really what's the lower limit about 15°F below the temperature of the fluid you are removing heat from. Move heat from air to water you can predictably get ≤30°∆T.

Can this device produce cold temp

It moves heat out. It only makes something cooler. I mean technically it can but you have to keep the heat from running right back in.

What would be the output power (in W) for a temperature difference of about 10 degC? What would be the optimum voltage at that point?

I can't tell you the output offhand, but it's not worth buying for only a 10 degree differential usage, at it won't really put that much out. Running a small pc fan on low-med RPM at best.

What is the maximum temperature this device can tolerate?

Dear, It can tolerate 200℃ (392℉)

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TEG1-199-1.4-0.5 40x40 High Efficiency Semiconductor Thermoelectric Generator

TEG1-199-1.4-0.5 40x40 High Efficiency Semiconductor Thermoelectric Generator

Product ID: 79620134

Details

Brand
Bolsen
Fuel Type
Heat
Item Weight
0.04 Kilograms
Material
Semiconductor
Output Wattage
10 Watts
Power Source
Heat Powered

⚡10W max power output

📏Compact 40x40x4.2mm size

🌡️Operates at 120°C temp difference

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Rp686374

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Description

⚡ Power your future with heat — small size, big impact!

HIGH TEMP RESILIENCE - Engineered to perform consistently at a 120°C temperature gradient—built for the heat.
RELIABLE 10 W POWER BOOST - Harness steady 10 watts of clean thermoelectric energy for your innovative projects.
OPTIMIZED ELECTRICAL OUTPUT - Delivers 11.1V open circuit voltage and 1.8A current for versatile power applications.
COMPACT INDUSTRIAL GRADE DESIGN - Sleek 40x40mm footprint fits seamlessly into any high-efficiency setup.
PLUG AND PLAY HEAT POWER SOURCE - No batteries needed—convert heat directly into electricity with zero fuss.

The TEG1-199-1.4-0.5 is a semiconductor thermoelectric generator designed for efficient heat-to-electricity conversion. Measuring a compact 40x40x4.2mm, it delivers up to 10 watts of power at a 120°C temperature difference, with an open circuit voltage of 11.1V and output current of 1.8A. Ideal for industrial and camping applications, this heat-powered device requires no batteries and offers reliable, clean energy in a durable, high-temperature resistant package.

Specifications

ASIN	B07G143NMH
Brand Name	Bolsen
Current Rating	1.8 Amps
Customer Reviews	3.7 3.7 out of 5 stars (20)
Engine Power Maximum	10 Watts
Engine Type	Thermoelectric
Fuel Type	Heat
Included Components	1 x 40x40mm TEG1-199-1.4-0.5 High Temperature Resistant Industrial Grade Thermoelectric Power Generator
Item Dimensions L x W x H	0.17"H
Item Weight	0.04 Kilograms
Manufacturer	Bolsen
Manufacturer Part Number	7V2A450D
Material Type	Semiconductor
Model Number	7V2A450D
Output Wattage	10 Watts
Power Source	Heat Powered
Recommended Uses For Product	Camping
Running Wattage	10 Watts
Starting Wattage	10 Watts
Wattage	10 watts

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