PowerWalker VI 650 SE LCD UPS: Power Consumption and Charging Efficiency Queries

Question

Hello (I know that the topic is about UPSs, but the power supply section is only about repairing power supplies). I plan to buy a UPS (for a home file server and possibly a router). At the moment, I am considering, for example, the PowerWalker VI 650 SE LCD model ( usb-lcd.html), but that...

freebsd · Accepted Answer

Answers:
a) Often from 6 W to, for example, 40 W - depends on the construction of the UPS. That's what I measured with branded constructions, and I've never dealt with Power Walker products. Line-interactive was in the upper compartment.
b) This needs to be measured for a specific UPS model. This is especially true for "Chinese" products, where batteries or electronics can change, despite using one trade name. Generally, it is not worth it at all, and you have to consider the number of charge and discharge cycles that the battery can survive.
b) Yes.
d) It has nothing to do with the capacity of the UPS. You need to know how much W and VA your device consumes and adjust the parameters of the UPS to these parameters.

freebsd · Accepted Answer

I measured and recorded some of the measurements: The battery charging efficiency is above 95%, and the efficiency of the battery charger power supply is estimated at 80%. The efficiency of the converter at discharge is also 80%. I would assume that for every 1 kWh drawn from the UPS operating on battery, the UPS itself will consume 1.5 kWh. Generally UPSs in offline technology.

freebsd · Accepted Answer

They have a different structure. Offline when powered from the mains, and when the battery is charged, it consumes only as much as the standby electronics need. In line interactive, the transformer is active all the time and therefore has higher losses.

devwebtel · Answer

In general, this is a server with a total power (in max. consumption) something around 15-20 W, if I remember correctly, and if necessary, I will connect the router. I use a laptop myself, so I have a kind of integrated ups . 40W in standby (while it is charged and does not need to be recharged) is a lot. Are you sure? With the fact that it is not profitable, it is obvious, but I am curious if it is more, for example, 2x more consumption or, for example, 5x. Do you know any reliable power supply that draws more 6 than 40 ?

devwebtel · Answer

I've read about online and offline in general, and from the wikipedia description, offline and line-interactive use the same thing (so either it was misspelled or I misunderstood).
I just found this blog by googling (and I will say that it helped me a lot).

If 1 kWh is 1.5 kWh, it's not bad. I expected even worse results (2 kWh type).

I'll take a look and if I don't have any more questions I'll close the thread.

devwebtel · Answer

Oh, I understand.

I was looking for a quick one, but e.g. https://www.morele.net/ups-cyberpower-dx650e-fr-548676/ would be good?
Generally, I have power outages once every few months and they literally last from 30 seconds to 10 minutes, and if the server has such a low consumption (or maybe a router and modem connection), even then it will probably take a good hour at least. So I don't care about the capacity, but such a power consumption of 40 W in standby mode is average

.

I plan to buy some online and check it with a multimeter (and possibly return it within these 14 days).
How is it measured? Is it a good idea to connect to the battery in offline mode or it won't do anything?

And ... and such a question (probably the last one): How often does such a UPS recharge itself (because when an unused battery loses its power, and I know it from my laptop, which is constantly connected to the network, that after about 2-3 weeks the drops to 94%, the charging system turns on and recharges it)?

Overall thanks for your help Freebsd.

@Edit: And... what is surge protection (on some UPSs there are connectors without emergency power, but only with surge protection)?

freebsd · Answer

I can't help. I'm dealing with larger UPSs and I just don't know what to advise about the small ones. You need the simplest of ups and power consumption matters here. Quality may be a problem, but I have the impression that even branded producers treat small UPSs with little care, so it's hard for me to recommend something branded - according to. me, which is to buy a cheap UPS with a long warranty :-) A multimeter won't help here. You need a wattmeter - they are priced below PLN 50 on Allegro and in supermarkets. As for the battery, if you mean connecting some UPS to a battery with a larger capacity than the nominal one, it's not a good idea. This is only the case with dedicated UPS models. The first problem is the charging current - it may be too low to charge the battery in a reasonable time. More importantly, a regular UPS is not designed for long-term operation. Sometimes it would be enough to add a fan, but we are still not sure that something will not be damaged, burnt, set on fire... UPS's have lead batteries that recharge more often, much more often. They have a much higher self-discharge than the lithium-ion batteries that are used in laptop batteries. I have not checked how often the UPS recharges the battery: it depends on the condition of the battery, temperature and set voltages at which the UPS will start charging the battery. It may also be that the battery is constantly charged with the buffer voltage, and only the current changes depending on the degree of discharge. please kindly :-) UPSs in many myths are very good surge protection. In the case of offline UPS, this is completely untrue. For line interactive this is more true, and for on-line it is true. The possible protection does not protect, or only minimally protects, the UPS itself. Often it is the UPS that is destroyed, but the equipment connected to it can survive (rather not with the offline type). Most often, the manufacturer adds a varistor, and sometimes even a simple filter (chokes, capacitors). In cheap designs, I would expect only a varistor on the power supply. Regardless of the manufacturer's declaration, I would use, for example: R-20F, --- but note: http ://jackiewiczowie.blogspot.com/2015/05/r-20f-rozgaeznik-przepieciowy.html It costs pennies and is very decent. See also these threads:

devwebtel · Answer

Thanks for your help, I'm closing this thread.

As for the surge protection, I thought it didn't give much, and they do it so that there is an additional "ficzer". As for wattmeters, I had a moment yesterday evening and found some for about PLN 40-50 and will probably buy it together with UPS.

You can always pay the PLN 39 extra for an additional 2-year warranty

.

And besides, if anyone is curious, after contacting PowerWalker's technical support, the VI 650 SE LCD model consumes 5-8 W in standby mode and it can increase to 15 W at high load (and of course when charging the battery), and the model has 17 W charger (and the charging power is included in these 5-8 W).

Here's if anyone wants to read the whole message:

Spoiler:

Dear (my name here),

Thank you for choosing PowerWalker products. Standby mode consumes around 5-8W, this own power consumption may increase to around 15W at high load. UPS will increase the consumption when it is recharging batteries.

This model has 17W charger which will top up to the previously mentioned values when the battery is discharged. For normal operation (float charge) the charger power consumption is included in the values that I have mentioned.

best regards

Thanks again freebsd.

@Edit: WTF, there was an internal error, and it was writing to the forum

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PowerWalker VI 650 SE LCD UPS: Power Consumption and Charging Efficiency Queries

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