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07-21-2012, 12:20 PM
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#1
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Member
Join Date: Jul 2012
Posts: 64
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Generator AC unit
Hi
I have a 15 kw singel phase generator at home, the generator powers the house plus one 1,5 ton windows ac units and a 1,5 ton spilt unit.
The problem is when the generator is on the window ac is turned on 3 min after the gen has started after 3 min from the start of the window ac the siplit unit goes on and when it does that the generator stall and the voltage protections that is installed on the ac unit's turns of the ac unit's
is there any thing that can be done to solve this problem ?
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07-21-2012, 12:37 PM
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#2
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Electrical Contractor
Join Date: Apr 2008
Location: Chester, VA.
Posts: 774
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Generator AC unit
What brand generator and transfer switch?
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07-21-2012, 12:54 PM
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#3
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Member
Join Date: Jul 2012
Posts: 64
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Generator AC unit
Its a perkins generator and the transfer switch is home made
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07-21-2012, 01:16 PM
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#4
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Master Electrician
Join Date: Mar 2010
Location: Toronto Ontario
Posts: 1,161
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Generator AC unit
Quote:
Originally Posted by quanchai
Its a perkins generator and the transfer switch is home made
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nuff said
__________________
Sarcasm is my friend
I'm here to learn too, i do mostly commercial/industrial/new construction and this place is a great way to pick up tips on residential from some good electrical minds. Excuse the spelling, my phone has a mind of it's own.
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07-21-2012, 01:45 PM
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#5
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E2 Electrician
Join Date: Apr 2012
Location: Litchfield, CT
Posts: 3,121
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Generator AC unit
Quote:
Originally Posted by quanchai
Its a perkins generator and the transfer switch is home made
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Im sorry, what?
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07-21-2012, 03:26 PM
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#6
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It was a dark and stormy
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,954
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Generator AC unit
Quote:
Originally Posted by quanchai
is there any thing that can be done to solve this problem ?
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Hard start kit for some of the ACs; it's a $40 gamble.
So, how did you make the transfer switch? 
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07-21-2012, 07:00 PM
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#7
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Member
Join Date: Jul 2012
Posts: 64
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Generator AC unit
Magnetic relays it's made to transfer the power betwin 3 power sources, It does around 20 transfers a day has been working for 2 years now without a single problem
I can take a picture of it an show you ?
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07-21-2012, 08:00 PM
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#8
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Master Electrician
Join Date: Mar 2010
Location: Toronto Ontario
Posts: 1,161
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Generator AC unit
That's not exactly homemade. I think what most are thinking is some hand welded giant switch you pull. Had me worried there.
__________________
Sarcasm is my friend
I'm here to learn too, i do mostly commercial/industrial/new construction and this place is a great way to pick up tips on residential from some good electrical minds. Excuse the spelling, my phone has a mind of it's own.
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07-21-2012, 08:22 PM
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#9
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Member
Join Date: Nov 2011
Location: Md/Pa
Posts: 827
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Generator AC unit
It could simply be that you are maxing out the power capabilities of the generator with other loads in the house when the second A/C is trying to start. A/C units and motors draw quite a bit of current for a short time when they are first starting.
Is this a new A/C install or has this configuration been running ok in the past?
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07-22-2012, 10:31 AM
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#10
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It was a dark and stormy
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,954
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Generator AC unit
Quote:
Originally Posted by quanchai
Magnetic relay
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Assuming it costs less than $400 or so, I'm interested in the maker and part number for this relay that has been proven to work in this application.
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07-22-2012, 02:28 PM
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#11
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Member
Join Date: Jul 2012
Posts: 64
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Generator AC unit
the house alone just need's 7 amps so i dont think its a problem for the generator
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07-22-2012, 02:29 PM
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#12
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Member
Join Date: Jul 2012
Posts: 64
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Generator AC unit
the spilt unit is 6 years old but works fine
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07-22-2012, 02:31 PM
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#13
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Member
Join Date: Jul 2012
Posts: 64
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Generator AC unit
it cost me 50 dollars to buy all the parts that i needed to build the ATS
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07-22-2012, 02:34 PM
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#14
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It was a dark and stormy
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,954
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Generator AC unit
It's the surge/rated watts ratio for the gen (probably 1.6:1 or less) vs
the surge/rated watts for your loads (could be 10 to 1).
15kw @240 gives you 63A steady state capability.
The surge for my 2.5 ton central air is 4x or 5x the steady state amp value, probably going to 2x steady state within 0.1 second of startup and to 1x within one second.
Last edited by Yoyizit; 07-22-2012 at 02:40 PM.
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07-22-2012, 02:41 PM
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#15
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Member
Join Date: Jul 2012
Posts: 64
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Generator AC unit
so is there any way to reduce the surge ?
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