Quiet mains UPS recommendation

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timmmay

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#3374666 19-May-2025 16:19

The 5E Gen2 900VA and the 3S 850 both have 9AH batteries inside, so should have similar runtime. The 5E 700 has a 7AH battery. The 5E is cheaper and would probably suit most people better than the 3S, as I think it's also an online UPS. I got the 3S as it has the battery protected USB sockets to run my raspberry pi directly, rather than having to convert to 240V then back to 5.1V.

geekIT

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#3374950 20-May-2025 14:44

Timmmay, thanks for the comments. Any idea how long the combo of Chorus ONT plus Spark TG582n modem would run on the Eaton 5E900 UPS?

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timmmay

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#3374952 20-May-2025 14:59

geekIT:

Timmmay, thanks for the comments. Any idea how long the combo of Chorus ONT plus Spark TG582n modem would run on the Eaton 5E900 UPS?

Nope. Only way to say is try it. I vaguely recall doing an approximation with an AI and from memory it was a few hours.

Tinkerisk

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#3375124 20-May-2025 22:14

The two batteries in my 1600VA (1000W) Eaton UPS just died yesterday. They lasted almost exactly 8 years, but we only have an average of 15 minutes of power outage per year. The one in the 800VA (500W) Eaton UPS is still holding out, but it's only a matter of time.

Commercial grade replacement batteries (from the original manufacturer, not from Eaton) are already on their way - which should last 10 years in standby. The two cost 65€ including shipping = 124 NZD (wow, your currency is in a pretty bad way at the moment). Spare batteries should not be kept on the shelf, as they have to be recharged every 6 months ... or if not, they simply die.

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geekIT

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#3375226 21-May-2025 11:06

timmmay:

I asked Eaton the questions, their support was SUPER helpful...

Is this a NZ Eaton you're referring to? Can you post their link, please? I'll ask them.

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timmmay

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#3375253 21-May-2025 13:21

I just typed Eaton support into Google, I think they were in Australia. I doubt they are going to be able to tell you much, it depends on how much power your devices use.

I asked perplexity: how long should an Eaton 5E900 ups with a 9ah battery power a chorus model 100 ONT, and a Fritzbox 7590 at low load

Answer:

how long should an Eaton 5E900 ups with a 9ah battery power a chorus model 100 ONT, and a Fritzbox 7590 at low load

The Eaton 5E900 UPS with a 12V/9Ah battery can power a Chorus Model 100 ONT and a Fritzbox 7590 at low load for approximately **3.5–4 hours** under ideal conditions.

It gave me a bunch of working, if you want that you should ask perplexity directly, or chat GPT. If you have any way to directly measure your power consumption, such as with a smart plug, you will probably get a bit of answer, but the estimate above is probably okay.

geekIT

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#3375259 21-May-2025 13:36

Hey, that's great. Thanks very much :-)

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Tinkerisk

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#3375400 21-May-2025 18:46

The approx. chorus power consuption estimate is 10W

The Fritzbox 7590 power consumption is 9-10W, so together 20W

The 5E900 can deliver max. 480W for 2 Minutes or 60W for 52 Minutes (non linear), hence approx. 150 Minutes (2.5h +/-15%) with 20W.

All data based on a NEW battery with full capacity.

Research and calculation time: 5 Minutes. No AI used, just NI. 😁

Tinkerisk

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#3376458 24-May-2025 22:57

The battery swap was easy and after initial charging for 24hrs, the two UPSs (1600VA and 800VA) are back for the next 10 years now. 🙂 I find the new Eaton 3P Ellipse ECO series very interesting if I didn't already have UPSs.

As a rule of thumb, you can roughly say for a UPS: The specified power in VA divided by four is the realistic load power for approx. 14-15 minutes. This quickly turns a ‘fat’ 2.5kVA-offered-UPS into a down-to-earth 600W load for 15 minutes. 😁

geekIT

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#3393336 11-Jul-2025 17:48

Following on from the above, I finally bought the Eaton 900VA but we've had no power outage since so I haven't been able to test it.

However, just as a matter of interest, I'm wondering how well a 20,000ma power bank would compare to the Eaton when supporting just a modem and ONT. Obviously it would need to be freshly charged and would need to be patched into the circuit after the power failure occurred, but if its performance was similar to the Eaton it's a cheaper alternative.

Similar units here:

https://www.pbtech.co.nz/category/power-and-lighting/power-banks?sfr=power+bank

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Jase2985

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#3393370 11-Jul-2025 20:32

geekIT:

Following on from the above, I finally bought the Eaton 900VA but we've had no power outage since so I haven't been able to test it.

However, just as a matter of interest, I'm wondering how well a 20,000ma power bank would compare to the Eaton when supporting just a modem and ONT. Obviously it would need to be freshly charged and would need to be patched into the circuit after the power failure occurred, but if its performance was similar to the Eaton it's a cheaper alternative.

Similar units here:

https://www.pbtech.co.nz/category/power-and-lighting/power-banks?sfr=power+bank

how do you plan on patching it in?

timmmay

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#3393376 11-Jul-2025 21:02

geekIT:

Following on from the above, I finally bought the Eaton 900VA but we've had no power outage since so I haven't been able to test it.

However, just as a matter of interest, I'm wondering how well a 20,000ma power bank would compare to the Eaton when supporting just a modem and ONT. Obviously it would need to be freshly charged and would need to be patched into the circuit after the power failure occurred, but if its performance was similar to the Eaton it's a cheaper alternative.

Similar units here:

https://www.pbtech.co.nz/category/power-and-lighting/power-banks?sfr=power+bank

I considered power banks, but they're not really made for continuous operation, and my modem / ONT need 12V rather than USB.

One way to test your UPS is to turn power off at the wall...

geekIT

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#3393545 12-Jul-2025 16:27

Jase2985:

how do you plan on patching it in?

I'd thought to just connect the power bank to the modem and ONT, but I've just read Timmmay's post and realized that there'd probably be a voltage mismatch.

'Those who can make you believe absurdities can make you commit atrocities.' Voltaire

'A patriot must always be ready to defend his country against his government.' Edward Abbey

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