Question about Refrigerators
Require VA,Watts,max. amps. & power factor in order to size a backup generator
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: I am installinga 4548 inverter.
Let just wait a minute. You have an inverter that is rated at 4500 watts.
This spooky. The inverter has a three phase input/three phase output? What is
the inverter going to be used for?
Next question. What type of batteries are you using and what is the voltage/current in series or parallel? What will be the total voltage you will producing with the batteries? What is the total current of the batteries.
Another question? What is the voltage of the 28 amps? If it going to dump 28 amps across some batteries that rated at 12 volts and 1400 amp/hrs. For 12 volt batteries with a total of 1400 amps. What you will need approx 14 to 14 1/2 DC and with 28 amps across the batteries for charging these batteries. The batteries will be gone in about 1 hour. Boil all the water out of them. When a battery starts to boil it release water with hydrogen gas (the gas is very explosive and dangerous).
You also don't have a regulation circuit to limit the amount of current depending on the needs of the batteries. Also, you don't have a trickle charger to keep the batteries fully charge when the batteries are idle.
You will also need DC regulated charger that will keep the voltage 2-4 volts above you battery voltage. Without this voltage above the batteries voltage it will not charge those batters. Batteries need to forced to except a charge that why voltage above the source voltage. If you can check the voltage on your car/truck with a 12 volt system. While engine is running the voltage across the battery will be 13.8 to 14.1 volts. Now, the current limiter is the alternator it has a regulator built into it for stabiizing voltage and current went the batteries require more current but it limited by alternator regulator
Now, to get more current out of the alternator the regulator will supply dc voltage to the stator of the alternator generator more current. More dc voltage is supplied by the regulator but the dc voltages is limit to about 24 volts. Another limiting factor is the alternator copper windings diameter---larger diameter more current, small diameter less current. Utilities systems use big mega watts generators. The maxi um dc voltage for these three phase generator would like 500 to 800dc volts for peak to peak output. There is a simpler way of doing this.
You need to rethink everything here. Also, I can help you if you supply the needed information.
I truly wish you luck in your electrical endeavors. GB you. stewbison
Posted on Aug 22, 2011
SOURCE: Need to know if I
There should be absoluty no problem on that 1600 watt generator..at max when compressor just starts its drawing about 750 watts, that is the max usage when running its about 500 and on defrost its like 850 ..so on 1600 watt generator no problem
Posted on Aug 25, 2011
SOURCE: I have a kenmore refrig/freezer.
The calulation of max wattage is going to be 750 watts at start up and be around 500 on normal running wattage after start up so a 1100 watt generator should be fine.
Posted on Sep 06, 2011
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