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Transfer switch for generator

Posted on 6/26/23 at 3:04 pm
Posted by BatonRougeBuckeye
Baton Rouge, LA
Member since Aug 2013
1834 posts
Posted on 6/26/23 at 3:04 pm
I have a 5700kw generator for power outages. I’ve been told I could have a transfer switch installed that would allow me to run certain systems in my home by connecting it.

Does this sound accurate? Can an electrician install it? Cost? Any thoughts?
Posted by Bayou
Boudin, LA
Member since Feb 2005
39019 posts
Posted on 6/26/23 at 3:12 pm to
Yes but it ain't cheap. Mine was pricey and allows me to run 6 circuits. When we lose power it's worth every penny!
Posted by Baers Foot
Louisiana Ragin' Cajuns
Member since Dec 2011
3720 posts
Posted on 6/26/23 at 3:23 pm to
I had a retired electrician do one for me. $500 in labor plus the cost of materials (power inlet box, interlock kit, appropriate gauge power cable from genny to inlet box).
Posted by kengel2
Team Gun
Member since Mar 2004
32882 posts
Posted on 6/26/23 at 3:25 pm to
I would do a lockout kit and 30A plug instead of a transfer switch, then you could pick what circuits you want power to.
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5600 posts
Posted on 6/26/23 at 3:32 pm to
quote:

I would do a lockout kit and 30A plug instead of a transfer switch, then you could pick what circuits you want power to.

I would think that would be the easiest and least expensive route to go, and what I did at my house (well I should say I had a electrician do it).
Posted by ApisMellifera
SWLA
Member since Apr 2023
575 posts
Posted on 6/26/23 at 3:45 pm to
quote:

I would think that would be the easiest and least expensive route to go, and what I did at my house (well I should say I had a electrician do it).


It is very easy with the right setup. My house has the main breaker box outside with 4 additional spaces for breakers. 2 were taken by the A/C, one was a 15a breaker for the ac services outlet, and the last one was empty. I found a dual 30a/15a breaker for the ac and outlet, and then used the last 2 spaces for my 50a breaker for the inlet box.

Off the top of my head:

Interlock kit - $70
Inlet Box - $50
New breakers - $40
Romex - $30
Conduit w/ fittings - $20
Total - $210 and maybe an hour of my time.
Posted by Nawlens Gator
louisiana
Member since Sep 2005
5909 posts
Posted on 6/26/23 at 4:13 pm to
I have the main breaker box outside (with a disconnect switch from Entergy) that supplies the inside breaker box that has all the individual house circuit switches. I added a separate outside box with a disconnect switch that accepts the power cable from my 5500 watt honda generator and connects to the main outside breaker box below the Entergy cutoff switch. I disconnect from Entergy before switching to generator power. I trip the inside fuses for water heater and A/C and run the whole house on generator power. Only takes a few minutes to switch the home power source. I use what is known as a 'suicide cable' to get from generator to the separate outside switch box. I understand electrical circuits and somehow I've avoided suiciding myself the last 18 yrs.

My neighbor is an electrician who helped with wiring which took about an hour. The 2 outside boxes were a couple hundred total.

If you go to an electrical supply store and tell what you want to do, they can explain how, sell you the needed parts, and even suggest an electrician who could do it. I did the changes after Katrina and it was a great decision.
This post was edited on 6/27/23 at 2:16 pm
Posted by billjamin
Houston
Member since Jun 2019
14993 posts
Posted on 6/26/23 at 6:37 pm to
Depends on what you want. Everything from flipping breakers yourself to a critical load panel to a Span panel. Depends on what you wan to spend.
Posted by RetiredSaintsLsuFan
NW Arkansas
Member since Jun 2020
1979 posts
Posted on 6/27/23 at 6:45 am to
I had an electrician come by last week to work me up a quote for my 6250 watt generator. He said an interlock switch would be more cost efficient, but he had to check. My breakers are in the garage and I want to run a conduit to an outside wall of the garage. My main disconnect is at the back of the house.

What determines if an interlock switch will work or not?
Posted by kengel2
Team Gun
Member since Mar 2004
32882 posts
Posted on 6/27/23 at 7:41 am to
quote:

What determines if an interlock switch will work or not?


Your panel needs to have a main breaker and enough space to add another 2 pole breaker.
Posted by RetiredSaintsLsuFan
NW Arkansas
Member since Jun 2020
1979 posts
Posted on 6/27/23 at 8:17 am to
quote:

quote:
What determines if an interlock switch will work or not?




I have space for a 2 pole breaker, but my main breaker is at another location. I don't know why they do this up here.
Posted by kengel2
Team Gun
Member since Mar 2004
32882 posts
Posted on 6/27/23 at 10:20 am to
quote:

I have space for a 2 pole breaker, but my main breaker is at another location. I don't know why they do this up here.


Its code, it just started down here. Have to have a main disconnect on the exterior.

You could replace your main disconnect with a manual transfer switch and just put a 30A or 50A receptacle below the switch or where ever you want for your generator. You would have to manually switch it over and turn some breakers off if you wanted to do something like that.

LINK
Posted by DVinBR
Member since Jan 2013
14575 posts
Posted on 6/27/23 at 11:26 am to
I have an outdoor breaker panel on the side of my house

ran a short piece of #6 wire in flex conduit between a 50A breaker and a 50A inlet box

installed an interlock kit between the 50A breaker and the main

installed a soft starter on the AC unit now I can cool the house and all my refrigerators/freezers and run electronics with a 7kW running inverter generator
This post was edited on 6/27/23 at 11:32 am
Posted by RetiredSaintsLsuFan
NW Arkansas
Member since Jun 2020
1979 posts
Posted on 6/27/23 at 1:48 pm to
I got my quote for a 10 circuit transfer switch, conduit to outside wall and outdoor plug in for $2,291. It was more than what I was expecting.
Posted by lsujro
north of the wall
Member since Jul 2007
4022 posts
Posted on 6/27/23 at 2:25 pm to
quote:

I have an outdoor breaker panel on the side of my house

ran a short piece of #6 wire in flex conduit between a 50A breaker and a 50A inlet box

installed an interlock kit between the 50A breaker and the main

installed a soft starter on the AC unit now I can cool the house and all my refrigerators/freezers and run electronics with a 7kW running inverter generator



this is what i plan on doing as well. seems to be the simplest and cheapest way to do it properly - just have to monitor what breakers you are running. if you know your breakers, should be no problem.
Posted by DoctorTechnical
Baton Rouge
Member since Jul 2009
2901 posts
Posted on 6/27/23 at 3:09 pm to
quote:

I have a 5700kw generator
OK, I'll be that guy... at nearly 6 megawatts, you're going to need something a bit beefier than you'll find in the bins at Home D.
Posted by DVinBR
Member since Jan 2013
14575 posts
Posted on 6/27/23 at 8:44 pm to
Posted by BatonRougeBuckeye
Baton Rouge, LA
Member since Aug 2013
1834 posts
Posted on 6/28/23 at 6:02 am to
quote:

quote:I have a 5700kw generatorOK, I'll be that guy... at nearly 6 megawatts, you're going to need something a bit beefier than you'll find in the bins at Home D.


I am aware that my 5700 watt generator will not run the entire house. I’m just looking for an option that is more efficient than having extension cords running through the house.
Posted by Jon A thon
Member since May 2019
2134 posts
Posted on 6/28/23 at 7:27 am to
quote:

I have an outdoor breaker panel on the side of my house

ran a short piece of #6 wire in flex conduit between a 50A breaker and a 50A inlet box

installed an interlock kit between the 50A breaker and the main

installed a soft starter on the AC unit now I can cool the house and all my refrigerators/freezers and run electronics with a 7kW running inverter generator


This is what I have, except am 11kw I converted to Natural gas. Can run everything except the downstairs AC. Luckily all bedrooms and a second living room are upstairs, so it's more than enough. Installed the soft start on the 3ton AC for the upstairs rooms.

Only pain for me was that my panel was full. Had a sub panel already and had to move some breakers to the sub to make room for the 50 amp breaker coming from the outlet. I paid an electrician. All in, I think it was about $3500 for generator, conversion kit, soft start, and wiring.
Posted by PureBlood
The Motherland
Member since Oct 2021
4824 posts
Posted on 6/28/23 at 8:01 am to
quote:

I would do a lockout kit and 30A plug instead of a transfer switch, then you could pick what circuits you want power to.



This is the way. Mark the breakers you want to keep on now so that when you lose power, you're not trying to find em. Interlock kit is code compliant (in most applications). The only thing you may need to re-configure is your panel if you dont have enough spaces for a 30A breaker (not a hard fix).
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