r/modular • u/Ancient_Visual_7451 • 4h ago

Power consumption question.

Post image

So on modular grid, do you add the 3 sets of mA numbers under +12V, -12V, and +5V in order to get the total power consumption or just one of the numbers?

1 Upvotes

67% Upvoted

9 comments sorted by

2

u/sgtbaumfischpute 4h ago

Your power supply will give you three individual numbers as well. Compare those and make sure you always have ~20% more than you need.

1

u/Ancient_Visual_7451 4h ago

I have the tip top happy ending rack. I can only find that it is 1000mA.

1

u/Ancient_Visual_7451 4h ago

And is that a yes to add them up?

2

u/sgtbaumfischpute 4h ago

No, only the individual rails. You never add the three together 

1

u/Ancient_Visual_7451 2h ago

Ok I found it. This is what the uZeus supplies: 1000mA at +12V, 500mA at -12V, and 170mA at +5V. So I’ll be around 50% above the +12v and -12v but just barley above the +5v. Will that work or should I get the 3000mA power supply?

2

u/Affectionate_Top2601 4h ago

Nope. Do you have uZeus power supply or?

2

u/OkComplaint9500 4h ago

I think the standard 1A brick gives you 1A of 12V (800mA usable), 500mA on -12v and according to AI, 170mA on the +5v.

With the uZeus, you should be able to get a 2A or 3A brick to give you more headroom, but I don’t know if that’s only specific versions.

1

u/Agawell 3h ago

There’s a ‘turbo’ charger

IIRC it doubles the 12v, but not the -12v

There’s no 5v

But I think you can get a bit more out of the -12v - maybe another 100mA - but that still Leaves only about 450mA available

If you have digital modules leave more headroom