Community discussions

MikroTik App
 
Technetium
Frequent Visitor
Frequent Visitor
Topic Author
Posts: 76
Joined: Sun Oct 16, 2016 10:56 pm

More info about mUPS

Tue Apr 11, 2017 1:22 pm

The mUPS device it's very interesting.
I couldn't attend at MUM in Milano due to some work commitments.
Can we have more info about it?

Will the mUPS monitor the battery voltage and send alert message over ethernet (like low voltage, running on batt, no dc power..) ? Or will have a continuous monitor interface ?
Can mUPS share a battery with other mUPS device ?
Will be the output voltage adjustable ( 24/48/56 V) ? Step of regulator (1..2.. 5 V) ? Max output current ?
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 26912
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia
Contact:

Re: More info about mUPS

Wed Apr 12, 2017 11:48 am

It can't send anything, there is no software on it. It is a passive device. It will monitor the battery and show a LED light when it is full. It will also monitor the battery temperature, and adjust the charging rate based on that. A temperature sensor is planned to be included.
 
nordex
Member Candidate
Member Candidate
Posts: 104
Joined: Fri Mar 23, 2007 7:46 pm
Location: Croatia

Re: More info about mUPS

Wed Apr 12, 2017 6:25 pm

ok.
Then maybe info like

max charging current
max output current
12/24V ?
 
Technetium
Frequent Visitor
Frequent Visitor
Topic Author
Posts: 76
Joined: Sun Oct 16, 2016 10:56 pm

Re: More info about mUPS

Wed Apr 12, 2017 8:50 pm

If it is completly passive and give no remote signal, from my point of view, isn't very useful.
If the radio are running on battery i want to know it..
 
jondavy
Member Candidate
Member Candidate
Posts: 143
Joined: Tue May 12, 2009 11:14 pm
Location: Brasil

Re: More info about mUPS

Fri Jun 02, 2017 2:30 am

Charger and step-up converter I find anywhere,
I thought he was going to have at least one remote monitoring software
Because we need to have remote management of the towers and what happens in them,
I do not see an advantage in buying it if it is not manageable
 
Oversite
just joined
Posts: 5
Joined: Fri Mar 10, 2017 2:56 pm

Re: More info about mUPS

Fri Sep 15, 2017 10:31 pm

If it is completly passive and give no remote signal, from my point of view, isn't very useful.
If the radio are running on battery i want to know it..
You can easily script that in the powered mikrotik if it runs on 24v, if you script code to check the voltage, running on mUPS you get about 12 and not 24 as otherwise.
 
jayceep14
just joined
Posts: 7
Joined: Fri Feb 12, 2016 6:33 pm

Re: More info about mUPS

Sat Sep 16, 2017 1:53 pm

can mUPS shared the same battery?
I have big battery can i use this one with multiple mUPS? do they combine the charging capability as well?
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Sat Sep 16, 2017 6:27 pm

That is probably not to be recommended. Use the mUPS with a 7Ah or 18Ah battery.
When you have a much bigger battery get a dedicated charger and DC-DC converter to make 24v
and power your equipment from that.
 
dl1nux
newbie
Posts: 27
Joined: Tue Jan 03, 2017 11:45 am

Re: More info about mUPS

Sun Sep 17, 2017 9:18 pm

Hi,

mUPS sounds interesting. Is it possible to power possibly a PowerBox at which probably 4 wireless systems are connected wit PoE?
So is it possible to power 5 routerboards at the same time with one mUPS? Or is the current output limited anyway? 2A current (at 24V) should be ok for this constellation.

Thanks in advance.
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Sun Sep 17, 2017 9:43 pm

Sorry... it does "only" 700mA so not useful for that purpose.
See https://mikrotik.com/product/mups (brochure)
 
dl1nux
newbie
Posts: 27
Joined: Tue Jan 03, 2017 11:45 am

Re: More info about mUPS

Sun Sep 17, 2017 9:47 pm

@pe1chl:
Sorry, I don't find this information anywhere. A brochure isn't linked on the mikrotik site. And the product description also doesn't tell anything about this.
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Sun Sep 17, 2017 10:04 pm

I gave the link to the product page (got it from the newsletter - sure some products from the newsletter still have to be placed on the hardware page!)
and on that page there is a link to the PDF brochure which has the specs.
 
dl1nux
newbie
Posts: 27
Joined: Tue Jan 03, 2017 11:45 am

Re: More info about mUPS

Sun Sep 17, 2017 10:08 pm

Ok Sorry, the brochure link has moved from the left side to a button on the right side of tha page.
As we say in DL .... I had tomatoes on my eyes :-)
vy73
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Sun Sep 17, 2017 10:26 pm

Can always happen... I think dl1nux is your amateur radio callsign :-)
I am mainly active on networking (HAMNET) and multisite repeaters (like PI2NOS)
So 73!
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 26912
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia
Contact:

Re: More info about mUPS

Mon Sep 18, 2017 9:28 am

The direct link to the PDF brochure: https://i.mt.lv/routerboard/files/mUPS-170830105108.pdf
It has all the info you need.
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Mon Sep 18, 2017 4:35 pm

Normis,

That link is also on the product page. But please note that not all products in the newletter that have links to a product
page can be found when starting on the www.mikrotik.com site and navigating through "Hardware" etc.
This probably still has to be finalized.
(e.g. the S-RJ10)
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 26912
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia
Contact:

Re: More info about mUPS

Mon Sep 18, 2017 4:35 pm

Yes, but the question here was about mUPS and the above poster was not able to find the PDF link
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Mon Sep 18, 2017 4:39 pm

Yes, but the question here was about mUPS and the above poster was not able to find the PDF link
He had already found it, see posting #13.
However, I noticed the above when I tried to locate certain products while reading a printed copy of the newsletter, so no
way to click on the links. I searched for the products on the main site but they are not all there.
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 26912
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia
Contact:

Re: More info about mUPS

Mon Sep 18, 2017 4:44 pm

Yes, some of these products are not yet in the webpage, only in the newsletter. We will add them once we start to ship them.
 
User avatar
townet
just joined
Posts: 5
Joined: Tue Aug 22, 2017 11:40 pm
Contact:

Re: More info about mUPS

Wed Sep 20, 2017 4:00 pm

Hello,
inside mUPS there are two jumper 1,2A and 2,5A. What is their function ?
Now the max recharge current is only 700mA ?

tx
E.
 
MulderSk
Frequent Visitor
Frequent Visitor
Posts: 54
Joined: Tue Jul 29, 2008 12:36 pm

Re: More info about mUPS

Thu Sep 21, 2017 12:07 am

Hi,

mUPS sounds interesting. Is it possible to power possibly a PowerBox at which probably 4 wireless systems are connected wit PoE?
So is it possible to power 5 routerboards at the same time with one mUPS? Or is the current output limited anyway? 2A current (at 24V) should be ok for this constellation.

Thanks in advance.
Battery 12V 9Ah work time on battery 90min.
You do not have the required permissions to view the files attached to this post.
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 26912
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia
Contact:

Re: More info about mUPS

Thu Sep 21, 2017 8:57 am

Good results! Was this with traffic? Photo does not show any. Try it with full load.
 
User avatar
kevigizmo
Frequent Visitor
Frequent Visitor
Posts: 53
Joined: Mon Dec 19, 2011 3:35 pm
Location: Norfolk, UK
Contact:

Re: More info about mUPS

Thu Sep 21, 2017 2:59 pm

Hey Everyone,

So with this as it is passive in terms of it has no OS,
It's described in the brochure ect:
"In RouterOS it is possible to detect when running on battery power by monitoring the input voltage with scripting, since the voltage will change without a RouterOS reboot."

So, as obvious as it sounds, I gather this function purely is looking at what the MT would normally be powered by (say on DC side at 24v) then if the OS (say SXT) see's input voltage drop to say 12v (battery) then that's how it would detect its on UPS? (with appropriate voltage scripts and email script)

Cheers
Kev
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 26912
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia
Contact:

Re: More info about mUPS

Thu Sep 21, 2017 3:06 pm

Yes, Kevin. Exactly.
 
User avatar
jspool
Member
Member
Posts: 472
Joined: Sun Oct 04, 2009 4:06 am
Location: Oregon

Re: More info about mUPS

Sun Sep 24, 2017 1:11 am

For a feature request for v 1.1

Incorporate this into a wAP LTE and add a couple form C relays that are controlled by routeros (Pretend they are POE ports ;) )
Get alerts over LTE when site is having power issues etc.

Primary power script on up, on down

Voltage threshold min max
Voltage script above threshold
Voltage script below threshold


Imagine the possibilities.
 
nordex
Member Candidate
Member Candidate
Posts: 104
Joined: Fri Mar 23, 2007 7:46 pm
Location: Croatia

Re: More info about mUPS

Sun Sep 24, 2017 4:26 pm

Hi,

mUPS sounds interesting. Is it possible to power possibly a PowerBox at which probably 4 wireless systems are connected wit PoE?
So is it possible to power 5 routerboards at the same time with one mUPS? Or is the current output limited anyway? 2A current (at 24V) should be ok for this constellation.

Thanks in advance.
Battery 12V 9Ah work time on battery 90min.

Hello. It should work much more time on 9Ah battery.

Your consumption (3.9+2.3+3.1+2.7)=12W for RB + 4 for Hex POE = 16W Total power.
16W / 12V = 1.33A on 12V.
9Ah / 1.33A = 6.7h. Should work at least 6 hrs.

Either battery was not fully charged, or my math is incorrect or Low voltage cut off is set too high on mUPS.
 
mistry7
Forum Guru
Forum Guru
Posts: 1480
Joined: Tue Oct 13, 2009 11:57 am
Location: Germany

Re: More info about mUPS

Mon Sep 25, 2017 11:53 pm

Hello. It should work much more time on 9Ah battery.

Your consumption (3.9+2.3+3.1+2.7)=12W for RB + 4 for Hex POE = 16W Total power.
16W / 12V = 1.33A on 12V.
9Ah / 1.33A = 6.7h. Should work at least 6 hrs.

Either battery was not fully charged, or my math is incorrect or Low voltage cut off is set too high on mUPS.
You could only Use 50% of 9ah If you discharge much more your battery
will Not Long be your friend, mups discharge battery Not 100% to save Battery life
 
nordex
Member Candidate
Member Candidate
Posts: 104
Joined: Fri Mar 23, 2007 7:46 pm
Location: Croatia

Re: More info about mUPS

Tue Sep 26, 2017 11:47 pm

ok, 50% is 3hrs.

1.5hr is 25% of 9ah battery capacity
 
MulderSk
Frequent Visitor
Frequent Visitor
Posts: 54
Joined: Tue Jul 29, 2008 12:36 pm

Re: More info about mUPS

Sat Oct 07, 2017 11:24 am

Good results! Was this with traffic? Photo does not show any. Try it with full load.
Hi Normis why is not possible connect to mUPS through winbox to ros and manage mUPS ? use monitoring , watchdog and other.How can I monitoring problem with power now ? thanks for answer. In brochure you wrote In RouterOS it is possible to detect when running on battery
power by monitoring the input voltage with scripting, since the
voltage will change without a RouterOS reboot. So how can I connect to RouterOs ?
 
Azma
newbie
Posts: 45
Joined: Sat Sep 27, 2014 8:10 am

Re: More info about mUPS

Fri Oct 20, 2017 5:41 pm

Good results! Was this with traffic? Photo does not show any. Try it with full load.
Hi Normis why is not possible connect to mUPS through winbox to ros and manage mUPS ?
Hi, the mUPS itself doesn't contains routerOS as you can see on the brochure.

so far i know, MikroTik radios flagship are equipped with 24v power adaptor, you can monitor the volt at system health voltage. if the power of device running is supplied by power adaptor, you can see the voltage value 23v - 24v, but if supplied by battery, it should be 12v.
 
Naglya
just joined
Posts: 2
Joined: Fri Nov 17, 2017 8:28 pm

Re: More info about mUPS

Fri Nov 17, 2017 8:33 pm

Hi!
Is there any way to turn off the battery charging :?:
In solar systems, the battery capacity is hundreds of amperes per hour and there is no sense in charging them via mUPS. :(
 
User avatar
docmarius
Forum Guru
Forum Guru
Posts: 1224
Joined: Sat Nov 06, 2010 12:04 pm
Location: Timisoara, Romania
Contact:

Re: More info about mUPS

Fri Nov 17, 2017 10:42 pm

@Naglya Put a diode on the wire, so that there is only current flowing from the batteries:

mUPS --------|<------- battery
 
User avatar
neg2led
just joined
Posts: 11
Joined: Tue Feb 16, 2016 1:19 pm
Location: Melbourne, Australia
Contact:

Re: More info about mUPS

Sat Nov 18, 2017 4:35 am

Hi!
Is there any way to turn off the battery charging :?:
In solar systems, the battery capacity is hundreds of amperes per hour and there is no sense in charging them via mUPS. :(
If you don't need the battery charging feature, you don't need mUPS. Without charging, it's just a dumb PoE injector with dual power inputs - you'd do just as well to hook up both your battery bank and mains supply to your existing PoE injector, with a diode on each supply to prevent reverse-flow. This'll feed the injector with the higher of your two voltage inputs.

Blocking the battery charging feature of mUPS with a diode might cause undesirable results depending on the device circuitry/layout - even if it works fine, which i'd want to hear from MT themselves, you've pretty much spent $29 for a pair of diodes and a waterproof PoE injector.
 
Naglya
just joined
Posts: 2
Joined: Fri Nov 17, 2017 8:28 pm

Re: More info about mUPS

Sat Nov 18, 2017 9:09 am

@Naglya Put a diode on the wire, so that there is only current flowing from the batteries:

mUPS --------|<------- battery
Thanks for the response, but I need an industrial solution. It is not possible to mount a diode circuit at each connection point.
 
anuser
Long time Member
Long time Member
Posts: 601
Joined: Sat Nov 29, 2014 7:27 pm

Re: More info about mUPS

Mon Dec 04, 2017 12:49 pm

Hello,

the mUPS looks interesting. But how can I use it wirh 802.3af devices? Is anyone aware of an adapter?
 
User avatar
elkurbo
just joined
Posts: 5
Joined: Tue Aug 15, 2017 8:23 pm

Re: More info about mUPS

Wed Jan 03, 2018 11:02 am

Hello
I get mUPS for to install for my home for LHG 5nD with 951Ui-2HnD, it is working fine but I can't get voltage value by "/system health get voltage", also tested on OmniTIK U-5HnD r2 and no voltage value
is there any another method to know if my router run on battery or all those products can't support voltage monitor

Best Regards
 
Azma
newbie
Posts: 45
Joined: Sat Sep 27, 2014 8:10 am

Re: More info about mUPS

Wed Jan 03, 2018 11:25 am

Hello
I get mUPS for to install for my home for LHG 5nD with 951Ui-2HnD, it is working fine but I can't get voltage value by "/system health get voltage", also tested on OmniTIK U-5HnD r2 and no voltage value
is there any another method to know if my router run on battery or all those products can't support voltage monitor

Best Regards
yes, none of your RB has voltage monitor.
 
User avatar
elkurbo
just joined
Posts: 5
Joined: Tue Aug 15, 2017 8:23 pm

Re: More info about mUPS

Wed Jan 03, 2018 7:08 pm

Hello
I get mUPS for to install for my home for LHG 5nD with 951Ui-2HnD, it is working fine but I can't get voltage value by "/system health get voltage", also tested on OmniTIK U-5HnD r2 and no voltage value
is there any another method to know if my router run on battery or all those products can't support voltage monitor

Best Regards
yes, none of your RB has voltage monitor.
Thanks for your reply
This means i can't monitor power status remotely by most used devices, i was planing to implement mUPS in WISP to monitor remote AP in rural area but in this case it is useless for me because most are OmniTIK U-5HnD r2
is there any other way to know if main power failure
and how to know if device support voltage before i buy it
 
AgNeT
just joined
Posts: 1
Joined: Wed Mar 21, 2018 10:25 pm

Re: More info about mUPS

Wed Mar 21, 2018 10:38 pm

Hello, I have been reading your comments and I have mine, the mUPS is controlling and charging the battery while controlling the type of power to the radio? first of all, Thanks
 
caspat
newbie
Posts: 48
Joined: Wed Apr 28, 2010 3:55 pm

Re: More info about mUPS

Fri Jun 15, 2018 12:23 am

Need that device but a little bit more beefy, so we can add 100ah batt and it should be able tu supply power to a powerbox full load!
Maybe Gen2!!?? :)
 
mistry7
Forum Guru
Forum Guru
Posts: 1480
Joined: Tue Oct 13, 2009 11:57 am
Location: Germany

Re: More info about mUPS

Fri Jun 15, 2018 5:21 am

Need that device but a little bit more beefy, so we can add 100ah batt and it should be able tu supply power to a powerbox full load!
Maybe Gen2!!?? :)
No for full load the Mups is too small, some thing I really not understand!
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Fri Jun 15, 2018 12:08 pm

I think you should picture the use of the mUPS in a situation where there is a 7Ah or maybe 14Ah battery.
For such a large installation where you also do not need insertion via PoE you can just obtain a charger/inverter from the usual market (e.g. used in boats and trucks).
 
wpeople
Member
Member
Posts: 380
Joined: Sat May 26, 2007 6:36 pm

Re: More info about mUPS

Mon Sep 10, 2018 3:51 pm

we just set-up the following set on table:
HeX Poe powered with mUPS
OmniTik and one other MT device powered my HeX PoE.

mUPS fed with 24V 30W power supply, and a 12V battery.

In normal case, HeX shows ~25V 3W power output
but if i unplug the power adapter, HeX shows 19V power input and power output.
I can measure ~13.6V at battery!

I tought, mUPS has a relay inside, what connects the battery directly to power line, but it would result 13.6V at HeX.
Now what?
 
User avatar
mkx
Forum Guru
Forum Guru
Posts: 12980
Joined: Thu Mar 03, 2016 10:23 pm

Re: More info about mUPS

Mon Sep 10, 2018 4:07 pm

So mUPS might have a DC-DC converter.

BTW, specifications on Web page don't have speciffics, while Brochure has:
PoE out:
  • when input 12-24V = 24V
  • when input > 24 V = same as input
  • when powered by battery = 20V
.
Measured voltage by hEX when on UPS (19V) is slightly suspicious, it should have been 20V. Reasons for it can be various.
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Mon Sep 10, 2018 5:04 pm

I tought, mUPS has a relay inside, what connects the battery directly to power line, but it would result 13.6V at HeX.
Now what?
Of course it has a DC-DC converter that converts the battery voltage to 20V.
Nothing to worry about.
 
wpeople
Member
Member
Posts: 380
Joined: Sat May 26, 2007 6:36 pm

Re: More info about mUPS

Mon Sep 10, 2018 5:41 pm

i didn't read the brochure, my bad. it says:

I didn't expect it to have a DC-DC up-convert for that low price :)

Thanks!
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Mon Sep 10, 2018 6:59 pm

I didn't expect it to have a DC-DC up-convert for that low price :)
DC-DC converters that do this can be had for a dollar...

https://aliexpress.com/item/1PCS-XL6009 ... 46491.html

(of course mUPS contains more than a single DC-DC converter)
 
itan
just joined
Posts: 1
Joined: Sat Sep 22, 2018 6:20 pm

Re: More info about mUPS

Sat Sep 22, 2018 6:55 pm

hi
I need info about charging battery from mups:
what input voltage and current from power supply
is enought to start charging process ?
I tested 18v 1000ma - charging started ok. but 16v 1000ma did not,
Battery was 9 a*h and 80% charged.
Such low voltage can be on input of mups located in 70-80m
from 24v 2,5a power adapter.
 
NetWorker
Member Candidate
Member Candidate
Posts: 116
Joined: Sun Jan 31, 2010 6:55 pm

Re: More info about mUPS

Sun Jun 02, 2019 1:48 am

Sorry for reviving an old thread (though it isn't that old! lol). I've been unable to find any comments on battery size. I know it'll take 7 and 12 Ah batteries. But any thoughts on going to 18 Ah? I realize it's a bit on the high side but we're looking at getting a bit longer run times at a low wattage location.

So... Experience, thoughts, advice on 18 Ah with mUPS?
 
User avatar
mkx
Forum Guru
Forum Guru
Posts: 12980
Joined: Thu Mar 03, 2016 10:23 pm

Re: More info about mUPS

Sun Jun 02, 2019 5:55 pm

Brochure says max battery charging current is 1A ... so it'll take ages to charge that "massive" 18Ah battery when fully discharged even if power adapter used is powerful enough.
Other than that, 18Ah battery should be fine.
 
NetWorker
Member Candidate
Member Candidate
Posts: 116
Joined: Sun Jan 31, 2010 6:55 pm

Re: More info about mUPS

Mon Jun 03, 2019 8:18 pm

Brochure says max battery charging current is 1A ... so it'll take ages to charge that "massive" 18Ah battery when fully discharged even if power adapter used is powerful enough.
Other than that, 18Ah battery should be fine.
Thanks for replying mkx. Actually, I have another question related to the brochure: it says 1A out on PoE. It says nothing about charging the battery. Does it draw the power for charging the battery from that 1A too or if I hook a 24V 2A PSU up to it, I get 700 mA on the PoE and 1A and change on the battery?

My thinking is if it goes down to about 30% and I usually draw the line at 50%, I'd be looking at 12-14 hours recharge times which I can live with.

My main concern with the 18Ah battery is that if it's not well regulated it can draw too high a current during initial charging and melt something inside the mUPS after only 20 cycles or so.
 
User avatar
mkx
Forum Guru
Forum Guru
Posts: 12980
Joined: Thu Mar 03, 2016 10:23 pm

Re: More info about mUPS

Mon Jun 03, 2019 11:15 pm

I have another question related to the brochure: it says 1A out on PoE. It says nothing about charging the battery.
The brochure has "Specifications" table on the top of second page. Pennultimate row reads "Battery charging current 1 A max" (and ultimate row mentions PoE out max current).
Does it draw the power for charging the battery from that 1A too or if I hook a 24V 2A PSU up to it, I get 700 mA on the PoE and 1A and change on the battery?
The brochure doesn't mention any power in limits (neither barrel-plug nor PoE-in). But let's do some math: for battery charging it'll dedicate max around 15W (13.5V and 1A gives 13.5W and let's add some losses on DC-DC converter). PoE out is limited to 0.7A @24V which is slightly less than 20W (more precisely it's 16.8W). Both combined are less than 35W, which means less than 1.5A @24V. Surprisingly supplied power adapter is rated exactly the same.

So given supplied power adapter and full rated loads on PoE out, your 18Ah battery being flat should fully charge in around 24 hours. Or around 10 hours from 30% to 80% charge.
My main concern with the 18Ah battery is that if it's not well regulated it can draw too high a current during initial charging and melt something inside the mUPS after only 20 cycles or so.
My guess is that any 12V lead-acid battery with capacity of a few Ah can draw much more than 1A when not completely charged if charger blindly applies 14.2V to its terminals (quite often that's voltage used to minimize charging time but it's too high as permanent/idle charging voltage, it causes gassing for most batteries shortening their life time). So I'd expect mUPS to have some current regulation built in or else it'd emit smoke in seconds (and we all know that electronic elements run on smoke ... after they let it out, they stop working).
 
pe1chl
Forum Guru
Forum Guru
Posts: 10529
Joined: Mon Jun 08, 2015 12:09 pm

Re: More info about mUPS

Mon Jun 03, 2019 11:41 pm

Such a charger normally operates in constant-current mode below a certain voltage, then clamps at a fixed voltage curresponding to fully-charged battery, where the current will drop.
Hopefully not at 14.2v but more like 13.8v.
Of course, a really good charger has more clever characteristics than that, but it is difficult to do it in such an unmanaged device.
(it would require knowledge of battery temperature, type, capacity, etc. so it would require configuration, sensor, etc. by then it is simpler to deliver the unit with built-in battery)

One should be careful not to use a battery with too high capacity, because the behavior of the battery will change when trying to charge it with so low current relative to a large capacity.
But at 18Ah, so charging at 1/18 of the Ah capacity, that should not yet be a big problem.
 
NetWorker
Member Candidate
Member Candidate
Posts: 116
Joined: Sun Jan 31, 2010 6:55 pm

Re: More info about mUPS

Mon Jun 03, 2019 11:56 pm

Lol, that makes sense. Thanks again! I'll post back if we decide to give it a shot. Right now we're leaning towards a different setup.

Who is online

Users browsing this forum: Kuitz and 5 guests