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#1
12-08-2008, 06:37 AM
 mmodi New Member Join Date: Dec 2008 Posts: 2
Wiring of Inverter/Home UPS

Hi,

I am using a 800VA (12V) Home UPS System as Inverter/UPS for PC. I need some technical assistance regarding wiring.

Please let me know:

- What is the difference between the attched wiring diagrams?

As I requested to my electrician for wiring as per the diagram “a” for whole house, but he says that it is impractical for the inverter wiring (however, he can do the same for my PC only, and for other appliances like light & fans he adopted “b” method).

Kindly suggest.

Thanks with regards,

M Modi
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#2
12-08-2008, 03:10 PM
 SgtWookie Expert Member Join Date: Jul 2007 Location: In the vast midwest of the USA; CST Posts: 22,039

Diagram a) is correct.
Diagram b) is not correct, as there is no return path to the inverter. The inverter should automatically take care of switching between the mains and it's own output.

If your mains voltage is 120, your inverter will only supply 6.67A output maximum. That is not much power. If it is being run from 12.6v batteries, the drain on them will be about 75 Amperes while the inverter is supplying the 6.67A output. Unless you have a very large bank of batteries, you will have power for only a short period of time.
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#3
12-09-2008, 02:25 AM
 mmodi New Member Join Date: Dec 2008 Posts: 2

Thanks for the reply, I am from India and here the supply Voltage is 220. I know that the Diagram A is ideal, but here mostly Diagram B is in practice (and its working - it may be that inside inverter the mains' neutral is connected to the output neutral of inverter, is it possiable?). This is a Home UPS system with a 135 AH power bank.
#4
12-09-2008, 05:06 AM
 SgtWookie Expert Member Join Date: Jul 2007 Location: In the vast midwest of the USA; CST Posts: 22,039

Since your mains are 220, you'll only get 3.63A from your inverter; your battery draw will still be around 75A. At the very most you will get 1.8 hours of operation at full load, but to maximize your battery life, you should not let it operate for more than about 1/2 hour (full load) on the batteries. Longer than that, and your batteries will become heavily discharged, which is not good for them.
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General info:
If you have a question, please start a thread/topic. I do not provide gratis assistance via PM nor E-mail, as that would violate the intent of this Board, which is sharing knowledge ... and deprives you of other knowledgeable input.
#5
12-09-2008, 07:27 AM
 leftyretro Senior Member Join Date: Nov 2008 Location: Hercules, Ca. (SF Bay Area) Posts: 394

Here is the USA your circuit example B would not be compliant with electrical safety standards and would be in violation with local and national building codes. The neutral wire in circuit B example would have to carry current back to the panel for both loads.

It is most likely the same wire size as the single line terminal wire and therefore is in danger of being undersized for the current draw of both loads even if both line wires are protected with a properly sized circuit breaker for the line wire size.

I would assume that you must use single wire runs in your typical home to even be able to consider wire circuits as shown in your example B. Here we always use 3 conductor cable (line, neutral, ground) and daisy chain to loads and each cable run would typically wire to a 20 or 30 amp circuit beaker. There may be a 6 to 12 such runs in a typical home here.

Lefty
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Measurement changes behaviour
#6
03-04-2009, 04:53 PM
 AnandMisal New Member Join Date: Mar 2009 Posts: 1
Inverter Wiring Issue

Hi
I am from India and planning to use UPS / Inverter System at my home.
What will happen if I connect ( Diag 2 ) HOME UPS Neutral (N) to LOAD ON UPS Neutral and Mains Neutral BOTH. Will that solve my problem of return path OR is it going to create any major issues?

Regards
Anand
#7
03-04-2009, 05:12 PM
 b.shahvir Senior Member Join Date: Jan 2009 Location: Mumbai (Bombay), India. Posts: 441

But wat's the logic behind sharing a common neutral as depicted in fig. (b) ? External neutral means you are atttempting to by-pass the inherent safety equipment of the UPS. This can result in safety issues!
#8
05-20-2009, 10:54 AM
 KASIM999 New Member Join Date: May 2009 Posts: 1

Iwant to get wiring digrams fof MAXIMA inverter if possible
#9
07-12-2009, 10:07 AM
 agnii New Member Join Date: Jul 2009 Posts: 1
Wanted to know how youfinally wired

Were you able to follow digram a), if yes what wiring changes it involved.
#10
10-16-2009, 02:44 PM
 rajudp New Member Join Date: Nov 2008 Posts: 1

i think both a and b are correct. In offline ups the neutral is common for both mains and ups out. But for online primary neutral is isolated with ups out neutral

 Tags inverter or home, ups, wiring

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