Revive Your UPS with a Maintenance-Free Car Battery: Affordable Solution for Power Outages?

Can a maintenance-free car battery be connected to the UPS? The original "battery" has worn out and I'm looking for a cheap way to resuscitate the UPS. Are there any contraindications?

battery cannot be connected

But why?
The UPS has too little charging current?
Can a car battery give too much current?
The UPS has a 12V battery, so the voltages match.

The UPS will not survive a charge or will not charge a battery with much more than the nominal capacity. In addition, the charging time will be significantly extended, which entails a high chance of a power outage with frequent power failures

And if the battery is charged, I will connect it only in the event of a power failure. UPS as backup "generator". So: the charged battery is in the car in front of the house, my power is turned off and then I take the UPS out of the cabinet, I go to get the battery, plug it in and see if there are any contraindications for the UPS to power my laptop, TV and, for example, a bedside lamp for 5 hours. The UPS is 1000VA.

There are no contraindications. How much will it support you: add up the load power in watts or volt-amperes and check the backup time table on the manufacturer's website or in the UPS manual.
For example, APC SMART 1000XL pn:SUA1000XL with a load of 400W supports about 33 minutes (2 pcs 12V/18Ah batteries connected in series, i.e. 48V/18Ah) a larger battery will last longer, but in a non-linear way in relation to the smaller one! 2h33min with the use of an additional manufacturer's extension with 4 18Ah batteries, i.e. to the previous +24V/36Ah additionally 24V/54Ah

I use a UPS to power a certain device and power it with a 12V / 60Ah battery. On the secondary side there is a load of about 200W. When there are frequent switches to emergency power, I disconnect the battery and charge it with a car charger. In my case, it works flawlessly. Regards.

That's it. I want to use the same solution. Thanks for the help. Regards.

If it helps someone, I would like to inform you that I have been using UPS power from the stair car battery in my car for several years, not only that, my UPS needs a 24 V battery and for this purpose I carry an additional battery (also 60 Ah) which I temporarily charge via a simple switch system from car power system.
It all works flawlessly.
You would sometimes need to see the faces of customers who notice how I turn on devices (drills, grinders, lamps) for 220 V in the trunk.
Through their open mouths, I can sometimes see the color of the panties they're wearing underneath their pants.

Eeeenooo, I see that I'm not the first to have such ideas.

Hello ! I wanted to ask if it is possible to connect this car battery to a UPS or not? is it safe? I need a UPS for central heating to power my water circulation pump and 60W blower in the event of a power outage. please help

primastar wrote:

Hello ! I wanted to ask if it is possible to connect this car battery to a UPS or not? is it safe? I need a UPS for central heating to power my water circulation pump and 60W blower in the event of a power outage. please help

The theories are different.
I will tell you from practice. I have a UPS Smart APC 620 + 45Ah battery in a similar application as you. It has been operating for three years. In winter, it feeds the central heating boiler and solar collectors in the summer.
Do not connect to a small UPS (e.g. 300VA), it will not produce heat for a long time, the charging system is weak. The bigger ones are fine.

hey guys and how will he use the cooling system? will it work then?

This forum is subject to Polish spelling rules - correct this post!
[Acres]

Hello,
connect as much as possible. We used such a system at the control cabinet. It works flawlessly.

Regards

Hello colleagues.
I have feedback and a question
I have a 700VA UPS.
Originally it had 6.5Ah.
It was supposed to be scrapped after a dead battery, but luckily it got to me.
I presented him with 2x 18Ah permanently mounted outside the UPS, I pulled new wires (25mm^2) which I soldered directly, so there is a cut in the housing and you can see a piece of PCB. By the way, I did not spare the tin to strengthen the paths to the mosfets and to the transformer wires (which I soldered, not on the pins).
In addition, I installed a 12cm PSU ATX fan from the bottom, which is on the switch.
Effect
At maximum load, it is able to work for up to half an hour (the set I have connected to it is 500W without a dozen or so watts, the rest was maintained by the halogen 0.5kW. With such a load, I turn on the fan (if I have time, I will install an automatic temperature system) .
With a lower load (about ~150W) it worked for over 4 hours, the fan on forces circulation around the heatsinks and PCB in general, summer air escapes, so my "operation simulation" worked - it is necessary).
Charging 36Ah instead of ~7Ah takes a lot - about 1.5 days, but I support it with a gel charger, and treats it to a voltage of 13.6V (it charges itself to 13.55V), but it can do it itself as I mentioned.
And now the question about the mentioned "acids" - as with the charging voltage
As a standard, UPS maintains a voltage of 13.4V - 13.6V with a charged battery - as in the case of an acid case
I am specifically interested in gassing the "car" battery at this voltage.
It will be safe

Thanks for the help. I'm closing the topic.