AC220V backup power from 12V battery with mains failure
published: 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.
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)
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.
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)