Duet maestro heated bed

Avrimo2

Hello All! Just ordered a Maestro for a 3d printer that I'm currently building.

I'm planning to acquire 24V 400W 300x300 silicone heated bed. The current rate should be 16.7A which is less than the allowable 18A on the board.

Would appreciate your assistance with the following questions:

Should I: a) use the internal MOSFET? b) Add an external one? Or c) ass a good quality SSR (I read that MOSFET is better or DC-DC application.)
If the bed is 400W and the rest is approx. 50W I conclude I need to buy 600W PSU as 450W is at the edge (with only one extruder).. is my conclusion reasonable in your opinion?
I prefer to optimize the payment so 450 is cheaper thus..

Thanks allot!

Veti

@Avrimo2 said in Duet maestro heated bed:

50W I conclude I need to buy

how did you arrive at that?

1 x 40w heater cartridge + all stepper motors would be more than that.

for the heated bed you should check the resistance before connecting it. its close to the max 18 A.

Avrimo2

@Veti e3d v6 is 30w I believe

Veti

25 or 40
https://matterhackers.dozuki.com/Wiki/E3D_Heater_Cartridge_Resistance

Avrimo2

Damn you're right...
So 600W? Is it standard?

dc42

If the bed heater really does draw 16.7A then a 450W PSU would be marginal. You could get away with a good quality 450W PSU (e.g. MeanWell) if you turn the voltage down a little, especially if you wait for the bed to reach temperature before you heat the hot end. Otherwise you should use a 600W PSU.

Avrimo2

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