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lobster2b

Power requrements, replacing stock

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Posted · Power requrements, replacing stock

Hi

As i have made myself a hot bed, i need to do somthing about the power system.

Right now i have a psu supplying 12v to the hot bed, and the stock 19v supplying the printer itself..

now, what is the power requirements and do someone have a pointer to a good psu for the job? 19v.

I failed to take in account the power draw from the hotbed, as i dont have a dc ampermeter, im going to check it with a home watt meter when i return home.

Thanks in advance for any usefull input :D

 

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Posted · Power requrements, replacing stock

A simple multimeter is enough to estimate the power draw: measure the resistance of your heater:

Watt= Volts*Volts/Ohm

 

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Posted · Power requrements, replacing stock

A simple multimeter is enough to estimate the power draw: measure the resistance of your heater:

Watt= Volts*Volts/Ohm

 

Thats is a good and valid point.. il do that when home.

I still need to measure the total power used so i can get a power brick that could supply atleast 140% of what i need..

 

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Posted · Power requrements, replacing stock

Average normal ultimaker power is around 60W. But the default supply is double that to account for variations.

 

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Posted · Power requrements, replacing stock

so in theory i could hook up the hot bed with the same power supply?

This is an interesting development.

So if the heated bed is under 40w. oh the simplicity.

Somewhere i read that a psu around 80% workload is a happy psu.

 

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Posted · Power requrements, replacing stock

I am using a Chinese 400W 24v PSU from eBay, which has a trimmer to adjust the voltage down to 19v. This is driving the Ultimaker with a reprap PCB heater attached, It draws about 300W when warming up, then ~120W whilst running.

The heated platform is just connected to the existing MOSFET output, no relays or anything needed. Works well and is a very simple solution comapred with some!

 

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Posted · Power requrements, replacing stock

Hmm, that is alot of wattage, gues il better find me one of those myself :D

But first il try to run it on a 12v Psu, and make some measurements..

 

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