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July 9th, 2019 12:00
UPS 3750 Voltage
So I have a 3750W UPS (208V plug model) that has been running happily in a facility with 208V. I am moving this UPS to a location that has only 230v. I understand the input voltage is rated up to 255v on this unit, but will it still function normally at 230?
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adk_mechetech
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December 28th, 2022 16:00
That page does not contain any useful information.
The following page shows input and output voltages for each model. The 208v unit can accept an input voltage of 125-255v (autosensing). When wired appropriately (and grounded) to residential split phase 240v, it operates perfectly fine.
As for runtime, it will depend on the loads you wish to run and the condition of your batteries. Obviously you need to stay under the 3750w rating. I'm usually around 500w with my setup. I don't think the runtime graph on the unit is that accurate, but it is usually around 120 minutes.
DELL-Young E
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December 28th, 2022 16:00
Hello. I mean this.
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Rambo_Sambo
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December 29th, 2022 09:00
Once again, great information!
Thanks for your time!
-Sam
Origin3k
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December 29th, 2022 10:00
"...Why do you say that? "
Because @DELL-Young E is right. At least of the 4200 model 3 different version exists for 3 different markets/environments and all have a different operating ranges.
None of these UPS are user installable or at least in my country a certified electric technician is needed.
Regards,
Joerg
adk_mechetech
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December 29th, 2022 17:00
I am talking about the 208V 3750W model which is not hardwired. I am sorry you live in a country that requires an electrician to plug in a power cord. Also, yes, they have different operating ranges as I already brought up. 240V falls within the operating range of the 208V model.
Regardless, I don't really accept "because someone said so" as a real answer. As I said above, if you read and understand the documentation, one can infer that it is perfectly "safe" to run these units on 240V split phase. I see nowhere in the documentation where it explicitly says not to, or that it is a safety hazard. I 100% agree it is a non-standard installation and that it is an unsupported configuration. If I were running these in a production environment, I would hook them up properly. Since this is my homelab and doesn't run anything critical, I don't really care.
Is it ideal, no. Will it be less efficient and generate more heat, probably. Is it going to explode, no.