AC220V backup power from 12V battery with mains failure

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AC220V backup power from 12V battery with mains failure




by Remundo » 12/09/22, 00:39

Hello friends

I share my realization in anticipation of power cuts this winter.

Indeed, many small electrical services will be out of service (electric doors, boiler control, light, refrigerator) and daily life will be difficult.

The system that I propose was set up with the aim of guaranteeing the opening/closing of a parking door in an urban environment with little lighting.

Material chosen:

* AC220V-10A power line in 3G 1,5mm² cable
* 12V battery charger up to 10A (120W)
* 12V 110 Ah tubular lead battery with slow discharge
* DC12V to AC220V, 1000W converter

This installation delivers about 1000W for one hour, but can also support small electrical services of 100W for 10 hours, which in principle will be sufficient between 2 power cuts.

IMG-20220911-00334.jpg
IMG-20220911-00334.jpg (332.98 KB) Consulted 386 times


IMG-20220911-00331.jpg
IMG-20220911-00331.jpg (224.81 KB) Consulted 386 times


Technical principle:

* interpose on an existing electrical line: the battery charger, the battery then the inverter, then the final consumer to be supplied with 220V.
* when the mains is available, the battery is charged, if the mains is faulty, the energy stored in the battery allows the consumer to operate.
* sizing: depending on the end consumer (peak power and desired operating time)

Personally, my line supplies lighting and the door which consume 600 W for 2 minutes (20 Wh). This ensures about 60 cycles before the battery runs out (1200Wh). In practice less because there is a residual and fixed consumption of 50W in the inverter.

Explanatory video to download (< 10 Mo)
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Re: AC220V backup power from 12V battery with mains failure




by Christophe » 12/09/22, 08:33

You grilled me within a few days! But so much the better the more experiences the better!

So you are simulating for photovoltaics?
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Re: AC220V backup power from 12V battery with mains failure




by Remundo » 12/09/22, 08:49

no no, my system is simpler.

To put photovoltaics, it would be necessary to connect the panels to the battery via a charge controller.

I use the Enedis electrical network (even if it is intermittent) with a stupid battery charger.
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Re: AC220V backup power from 12V battery with mains failure




by izentrop » 12/09/22, 09:25

Remundo wrote:with a stupid battery charger.
If it is not a trickle charger that only charges intermittently between 12.3 and disconnects at 13.6V for example, battery life will be shortened with a standard battery charger.

What's a model? DC12V to AC220V, 1000W converter, because if it is a first prize, it will not be able to start a fridge with a 150 W motor and in the calculation of autonomy, it is necessary to count the standby consumption which is not not negligible.
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Re: AC220V backup power from 12V battery with mains failure




by Remundo » 12/09/22, 09:37

my charger is an old analogue model for lead acid batteries: it charges all the time up to an intensity which tends towards zero (but never zero). Don't worry about the battery, it's a beefy one originally installed in a HAKO Hamster sweeper which greedily squeezed 600W continuous from it. I had chosen this battery in tubular technology for deep discharge and well sized.

Leaving my emergency power supply running, I noticed that the current stabilized at 4A after a long time, which leads me to think that the inverter consumes about 50W (4A x 12V). I will have to go back there to see if this current is maintained or drops over time.

It is a cheap Chinese converter that is found under the name "pure sine". It seems robust and has 2 220V sockets.
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Re: AC220V backup power from 12V battery with mains failure




by izentrop » 12/09/22, 09:56

Remundo wrote:It is a cheap Chinese converter that is found under the name "pure sine". It seems robust and has 2 220V sockets.
1000 W among the Chinese is often not Watt efficient but crest to crest, but if it manages to run your 600 W motor without tripping, all is well : Wink:

600w is a lot for a garage door motor, which are universal motors https://www.vevor.fr/ouvre-porte-automa ... gItOPD_BwE
In normal mode measured with a good energy meter, it should not be as much.
Last edited by izentrop the 12 / 09 / 22, 10: 03, 1 edited once.
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Re: AC220V backup power from 12V battery with mains failure




by Remundo » 12/09/22, 10:01

it's crazy how much we refine our knowledge: the effective Watt and the peak-to-peak Watt, wow! Do you have scientific definitions of these notions?
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Re: AC220V backup power from 12V battery with mains failure




by Macro » 12/09/22, 10:47

Your garage door operator does not have a backup battery or at least a dedicated output for this purpose???

I have 3 actuators 1 solar allduck with its 12v 7Ah battery which allows it 7 openings without recharging despite the fact that it is a mains power supply I have never plugged it in that said it is the 3rd battery that I have used in 15 years of operation , and two hoorman (on my garage door and my other gate) on which I have two 12V 40Ah recup which allow at least 40 cycles (slow) in the absence of sector at the beginning I only powered the 2 hoorman on the HC to charge the batteries but the garage door in slow cycle took 2 minutes to open it was a bit boring ...
Last edited by Macro the 12 / 09 / 22, 11: 09, 1 edited once.
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Re: AC220V backup power from 12V battery with mains failure




by humus » 12/09/22, 10:49

It's funny everyone is thinking the same thing right now, I don't know why!? : Lol:
---------
Classically, the watt eff is calculated with U eff and I eff (leaving cos phi aside).

The concept of watt crete crete has been used in Audio, to inflate the performance displayed without inflating the effective power : Lol:
A scam, what!
P peak peak = 8 x P eff, just that!
(2x1.414)²
P peak peak = 2 x 1.414 Ueff x 2 x1.414 Ieff = 8 x Peff
in the same commercial register, there was the peak power= 2 Peff

-----
If not, is the battery the same type as for cars?
If so, what does it give in terms of longevity if the electronics manage it well?
Because I read everywhere that Auto batteries should not be used for a PV buffer?
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Re: AC220V backup power from 12V battery with mains failure




by phil59 » 12/09/22, 10:58

Yes, in audio, it's been a very long time, and then there were also the Watt RMS ....

You had real 100W speakers, with a yield of 94 db for 1W at one meter, and 1000W peak, with yields of 85 db for one W at 1 meter....
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