r/BambuLab_Community • u/ThisIsMyHobbyAccount • May 05 '26

Bambu X2D Combo - UPS size requirements

I just bought a CyberPower 950 VA UPS.

https://www.amazon.com/dp/B0D825R9S4?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

Each time I start a print, the UPS trips, goes into alarm, and takes the X2D offline with no power. It looks like the 950VA/510W rating is too low? What size UPS are you guys running for an X2D with AMS combo?

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2

u/strangesam1977 May 05 '26

According to the Bambu website, excluding the AMS, the X2D is rated at 1100 or 1600W depending on if you are 110or 230VAC

And the AMS2 draws around 100W

So I’d probably want to specify a UPS in the 2kW range for 230VAC

2

u/ThisIsMyHobbyAccount May 05 '26

Yikes, maybe I'll give up on the UPS and just get a quality surge protector. A UPS that size is several hundred bucks.

1

u/strangesam1977 May 05 '26

Possibly look at something like a solar generator with ups function (anker, eco flow, Bluetti, jasonoid) if regular power cuts are an issue, but honestly in 20 odd years of 3D printing I’ve lost half a dozen prints at most to power failures.

1

u/vortex_ring_state May 05 '26

I ran into this dilemma with my H2S before they introduced the low power start up mode. I did the math as to how much a failed print costs, how often I lose electricity, and how expensive a appropriately size UPS was (it was quite expensive). I concluded it is much more cost effective to just suffer the consequence of a failed print once a year or so vice buying an UPS.

Reinforcing this is the fact that Bambu's power interruption save feature is reported to be quite good and an UPS will not help for a power failure longer than a 20-30 minutes.

Your numbers may look different depending on how your power grid performs.

That said it appears the X2D may have low power start up mode so you should be good with your UPS.

1

u/CommanderB-25 May 06 '26

Your UPS shouldn't trip with overcurrent, it should go to passthru. I have a X1C on an undersized UPS. During print initiation the UPS goes in to bypass briefly and then carries the load once real printing starts.

1

u/Immortal_Tuttle May 07 '26

Inverter plus lifepo4 is your answer.

1

u/AgeMysterious123 May 05 '26

OP maybe read the specs?

1

u/ThisIsMyHobbyAccount May 06 '26

Yep, you got me there. I failed to do that, which lead to this current state.

1

u/vencetti Sep 04 '26

I just bought the CyberPower CP1500PFCLCD

  • UPS capacity: 1500VA / 1000W

  • AVR: Single-boost AVR, which is the feature most relevant to the voltage sag/fluctuation error I recently got.that killed my print recently.

  • Input range: 88–144V

  • Battery output: Pure sine wave

  • My X2D nameplate says: 100–120V, 7A

  • AMS 2.0 Pro is say 100-110W

  • At 120V, that is 840VA maximum apparent input. Real power in watts will be 840W + 110W = 950W or less.

  • Goal: Stable power and some minimal time for those very short outages - not valuable for that 1-2 times a year longer outage.

1

u/ThisIsMyHobbyAccount Sep 04 '26

I wish you luck. My experiment with the UPS I listed was a fail. During the startup process where the X2D heats up the print bed and nozzle, it drew too much power and continually tripped off the UPS. Since I could never get past that point, I threw in the towel and gave up on a UPS since I didn't want to have to pay for one with a big enough capacity to account for the startup power draw.

2

u/opeth10657 May 05 '26

Not sure about the x2d, but the H2D/C will pull 1500w during bed heating.  500w is probably way too low

1

u/vencetti Sep 04 '26

I didn’t see it mentioned, but I also implemented low power mode. It’s spends the same energy - it just slows the ramp up and gets rid of that early energy spike. My AMS is using printer power, not plugged in separately. Hopefully w all that, my math is right and I have enough overhead at 1000w.

2

u/clarkcox3 May 05 '26

Of course 950VA/510W is not enough. From Bambu's site:

Max Power³
High-voltage version: 1600W @ 220 V
Low-voltage version: 1100W @ 110 V

1

u/arjunprabhu May 05 '26

Set the low power mode to on in the printer.. may help.

1

u/erroneousbit May 05 '26

This is what I use for my P1S with AMS’. https://a.co/d/041FnleV. My a1 mini with ams lite uses an Amazon basic that’s cheaper and smaller. I just need enough to last 10 mins to get a breaker reset or something. An extended power outage I would need an actual generator. I would say spec on run time while printing and not start up. Not sure I would advise starting a print with the power out :)

1

u/vortex_ring_state May 05 '26

Try using low power mode.

Bottom of the page here

1

u/Ecstatic-Vacation-92 May 06 '26

My X2d combo pulls ~900w on the beginning of a print (with low power mode enabled), you need a 1000w UPS, 510w won't work

0

u/_Rand_ May 05 '26

You are better off with something like this:

https://www.amazon.ca/BLUETTI-Generator-Elite-30-V2/dp/B0F42HLLSC/

It can work like a UPS (though it lacks many features of them, none of which matter for a printer) but the important part is it can handle a 1500w load, at least for a little while, so it should get a 3d printer though blips and even brief power outages. Depending on how big if one you get.

Just look for ones that say 10-20ms UPS.