Powerful do-it-yourself uninterruptible power supply

Judging by the appearance of the UPS, he had 2 batteries at 7a \ h, and you set 140a \ h, the native charging will not cope with such batteries, you need to provide some kind of external charger. And so the idea is very good.

The idea is not bad, though not new. I have 62 Ah. For uninterrupted power supply of the laptop, Sat receiver, two access points (WiFi) and a boiler pump, I have enough. With rare blackouts, a simple device helps out, - a small transformer, - 13V at the output (current within one ampere), - a diode shunted by a car bulb (3-4 W.), - to the "+" battery. The second output of the receiver "-". When disconnecting the network, the battery. the bulb-transformer starts to discharge on the circuit. To avoid, there is a second circuit from a diode bridge assembly, loaded with a relay. When the mains voltage is disconnected, the relay opens the first circuit. The device is designed to restore sulfated batteries (the author will forgive me - I don’t remember the name), but there is no negative effect on fresh batteries. In addition, the voltage of the discharged battery slowly but rises. It may take 2-3 weeks to fully charge. If blackouts are frequent, but short-term, this option can drive. I do not advise increasing the power of the device - at low currents it restores the battery, but I don’t know what will happen at high currents. So far, if necessary, I put-off the car charger. Theoretically, it can be left connected constantly, because when fully charged, the current drops almost to "0".

Yuri, thanks for the interesting comment! Very entertaining. You should try to implement your version of a home-made UPS.

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This algorithm is wired in the UPS process. Before sawing / drilling your UPS, check this.

I do not agree with the GAG. The power supply unit is turned off if the driver is installed on the computer, then the compic saves all documents and sends a signal to the power supply unit to turn it off, and if nothing is set, the power supply unit works until it sits down.

Thanks for the article, the idea itself is not new of course, but it helped a lot in implementation now, especially in terms of cooling ....

All this nonsense .... trance in uninterrupted is designed to charge the battery that is in it! And it costs no more than 6-12 amperes / hour.
Accordingly, the charge current should be no more than 0.6 -1.2 A.
For a 140 amp battery, the charge should be at least 12-14 A. And how are you going to pull it out of that miserable trance? Not to mention diodes and more! In the best case, ruin the battery with sulfation .....

Firstly, the charger of a small UPS is not designed to work with such a capacity of batteries, this is rightly noticed, and the cross-section of the wires connecting the UPS to the batteries clearly does not correspond to what should be 140 Ah ... Secondly, what equipment Do you plan to power from such a UPS? The article is called "Powerful UPS ..", but the power of this UPS is unlikely to exceed 300 watts, which is enough for power, except for a couple of bulbs and a circulation pump at the boiler .. Thirdly, if deep discharges are planned, the starter batteries from KAMAZ are very fast it will be possible to throw, because they are designed to work precisely in the starter mode, but not in the cyclical deep discharge .. In short, as a budget option made by the crazy handles of an uninterrupted installation, this system will work, but no more ..

Guys, everything works and copes well! Itself made such a system, though on a 12v uninterruptible power supply, the battery is 75a / h, the only difference is that this battery will not charge for, say, 3 hours, like a 7 amp one, but for a day ...

The fan implanted into the old battery compartment - it is just opposite the power transistors, and powered it from the winding of the relay, which turns on when the mains voltage disappears - such a relay is stupidly searched by the tester on the board.

Wold,
Sulfation is not threatened. The charge current flows all the time. Yes, he is small. But the movement of electrons occurs in the active mass.
And sulfation is treated precisely with charge-discharge cycles with a small current.
So guys, feel free to use.I only advise you to connect a solar panel to the battery, or a homemade windmill.
And Chubais will have a rest and from lack of money the red bald head will fall out.

I have long been in the UPS garage with 55 Ah. works. In addition, there is a charger of approximately 1.2 A with a voltage limit of 13 V. Comp., Emergency lighting and other various gadgets are fed. Enough for 2 hours (I did not check anymore), the voltage dropped to 11.5 V. A 12 V fan is in place of the standard battery. Once every six months, the battery is charged with an asymmetric current car charger. I’ve been in work for about 5 years.

But in general, I’ll do it more cunningly, I’ll just put a charger for a car in a circle and the whole problem is solved and I put it on internal charging, that is, I’ll bp itself, I won’t start up the network and that’s all, by the way, I tried to work

The only thing that interests me is whether the BP itself will be covered by the fact that I will throw it to him, otherwise the battery instead of its native ???

And what kind of relay to use? I have the same UPS. Less than 2 volts are supplied to the LED.

The uninterruptible power supply at the output does not have a sinusoid, there are rectangular impulses or something like a meander, the boiler pump electric motor will not work, try connecting a simple one-legged fan to the uninterruptible alas, it will not spin.

the pump will work just the same, I have been working for 3 years with an energy-dependent boiler with a pump from an uninterruptible power supply, and no current buzzes when I work harder / but right now I am collecting a solar battery for this system.

The boiler pump from the uninterruptible power supply also works for me when the voltage is turned off. From the native battery lasts for 35 minutes. If you simply push through the heating system, then it will be much longer.