Curly Inverter Questions

by Khalid
(Doha, Qatar)

What is the maximum distance for 1000W 12VDC to 240VAC inverter can be from the main power panel?

What is the best way to use the above inverter in term of do I need to go throw main power panel

And the breakers such as 100A , 30,20 ,15 and 10 or?

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May 20, 2014
Inverter as close as possible to battery
by: Tony Clark

Simply put, the inverter should be as close as practical to the battery (Battery is usually a lower voltage than mains power) this means that the cables carrying battery current are kept short, to minimise I2R losses (I squared R) which is the resistance of the cables from battery to Inverter times the square of maximum current draw by the inverter. Once you are at mains voltages, the current is much lower for a given power draw, so these losses are significantly reduced.

Sep 13, 2011
Basic electricity (residential uses)
by: Keith (USA)

Let me start this by saying I am a Journeyman Electrician in the US where we use a 60 cycle per second frewquency. What is common practice here may not work well in areas of the world that use 50 cycles per second. There are aspects of electricity that apply no matter the frequency.

The distance from the source to the load is a hard question to answer due to the variables. What voltage are you using? Is the longest wire run going to be from the DC source or from the AC source (the output of the inverter)? What is the voltage output of the inverter? What will be the wire size of the longest wire run? (ie what gauge or wire diameter will be used?) Power (electrical) distribution over long distances is done using high voltages and transformers. Wire has a resistance per foot rating, too long of a run and too much power is wasted as heat disipated through the wires. As a rule of thumb the larger the wire, and the higher the voltage the longer the wire run can be. A typical 120 volt 15 amp circuit (in the US) uses 14 gauge wire within a normal dwelling.
As to the distance a load (light fixture, oven, refrigerator, saw, etc) can be from a source (recepticle, breaker / fuse panel, inverter) there can be no more than a 3% drop in voltage from the source to the point of use, or load. This voltage drop is called "line loss" and is the electrical energy lost due to the resistance of the wire. As current passes through the wire it creates heat. More current or more resistance causes more heat. This is why electrical fires occur, the wire gets too hot and ignites surrounding combustable materials. How far can you make a wire run, until you reach that 3% drop. If 120 volts are applied to one end of a pair of wires (hot and neutral) the lowest safe voltage at the load end will be aprox 116 volts. That still loses 4 volts to the wire and is not an efficient use of the power. If you look at extension cords the longest you are likely to find will be 75 to 100 feet (22.86 to 30.48 meters) in length. These are made of larger gauge wires than normally found on the shorter length cords. So a distance of 50 feet with 14 gauge wire should be Ok, but check the voltage drop first!!

Yes please always use fuses or breakers as close to the source of power as possible, the fuse or breaker is there to protect the wire and prevent an unintentional fire.

Please post more detailed questions on this matter for a more accurate answer.

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