Re: [AFMUG] Generator for office

[Sterling Jacobson]

Ok, those are good options.

A bit more expensive, but probably better to get a larger gen.

I like how Kohler still has a catch phrase, “Bold new Kohler design…” lol

From: AF  On Behalf Of SmarterBroadband
Sent: Monday, February 10, 2020 5:19 PM
To: 'AnimalFarm Microwave Users Group' 
Subject: Re: [AFMUG] Generator for office

These are 12Kw and look to be smaller than the Generac?

https://www.nationwidegenerators.com/briggs-stratton-40517-12kw-generator/

https://www.nationwidegenerators.com/kohler-12resv-120-240v-1ph-generator-with-oncue-generator-management-system/



From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Sterling Jacobson
Sent: Monday, February 10, 2020 3:59 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Subject: Re: [AFMUG] Generator for office

Good points.

Still, need a small form factor due to the building owner being obtuse about 
having a Gen on the back sidewalk.

So I’ll just wire the rack and maybe the lights for now and test it out.

3kw real output should cover those.

Also, I don’t want to have to excessively re-run my gas line to the unit, so 
the smaller NG gen the better and hopefully use the existing line given I’m not 
going to power the heat unit from NG at the same time the gen is on.


From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
ch...@wbmfg.com<mailto:ch...@wbmfg.com>
Sent: Sunday, February 9, 2020 7:03 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Subject: Re: [AFMUG] Generator for office

If your HVAC is 240 then you have more HVAC load than that generator can pull 
on just that one load.

40 amps x 240 Volts is 9600 Watts.

7.5 kW generac will only deliver 31 amps at 240 VAC  And you really don’t want 
to load a generator up that much.  50% is a good derating factor.  Also,  
generators publish their power output at sea level.

Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees above 
70 degrees F
Rounding up, you are close to 5000’ so that is 15% lost for altitude and in the 
summer at 110 degrees that is another 8%.
So you lose as much as 23% of capacity  on a hot summer day.  Worse if you 
power it from natural gas.

I would add up all your loads, add 50% for growth then double that figure for 
not loading the generator too much and to account for derating.

The installation is the expensive part.  Don’t scrimp on kW at this stage of 
the game.  Sounds to me like you need a 20 kW or more depending on your true 
HVAC loads.

From: Sterling Jacobson
Sent: Saturday, February 8, 2020 6:04 PM
To: AnimalFarm Microwave Users Group
Subject: [AFMUG] Generator for office

I need a smaller footprint generator for my 1300 sqr foot office.

Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that includes 
the 50A transfer switch.

I think my breakers has several 20A switches and 40A for the HVAC.

Not sure if this would cover the power needed for the whole unit, or just the 
fiber cabinet/rack I have that has max 20A circuit to it?

The next highest power draw is probably the HVAC and/or water heater.

The lights only draw about 500W since I switched them all to LED.



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Re: [AFMUG] Generator for office

[Seth Mattinen]

On 2/10/20 15:58, Sterling Jacobson wrote:
Still, need a small form factor due to the building owner being obtuse 
about having a Gen on the back sidewalk.





Ask if you can put it inside. Mine (Cummins diesel) are inside.

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Re: [AFMUG] Generator for office

[chuck]

Going from a 7.5 to a 15 kW is not physically that much larger.  

How about in the tree strip behind your building?
Or sacrifice a parking space.  

From: Sterling Jacobson 
Sent: Monday, February 10, 2020 5:13 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] Generator for office

They said no for roof installation.

 

From: AF  On Behalf Of ch...@wbmfg.com
Sent: Monday, February 10, 2020 5:11 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] Generator for office

 

Roof?

 

From: Sterling Jacobson 

Sent: Monday, February 10, 2020 4:58 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] Generator for office

 

Good points.

 

Still, need a small form factor due to the building owner being obtuse about 
having a Gen on the back sidewalk.

 

So I’ll just wire the rack and maybe the lights for now and test it out.

 

3kw real output should cover those.

 

Also, I don’t want to have to excessively re-run my gas line to the unit, so 
the smaller NG gen the better and hopefully use the existing line given I’m not 
going to power the heat unit from NG at the same time the gen is on.

 

 

From: AF  On Behalf Of ch...@wbmfg.com
Sent: Sunday, February 9, 2020 7:03 AM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] Generator for office

 

If your HVAC is 240 then you have more HVAC load than that generator can pull 
on just that one load.  

 

40 amps x 240 Volts is 9600 Watts.  

 

7.5 kW generac will only deliver 31 amps at 240 VAC  And you really don’t want 
to load a generator up that much.  50% is a good derating factor.  Also,  
generators publish their power output at sea level.  

 

Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees above 
70 degrees F

Rounding up, you are close to 5000’ so that is 15% lost for altitude and in the 
summer at 110 degrees that is another 8%.  

So you lose as much as 23% of capacity  on a hot summer day.  Worse if you 
power it from natural gas.  

 

I would add up all your loads, add 50% for growth then double that figure for 
not loading the generator too much and to account for derating.  

 

The installation is the expensive part.  Don’t scrimp on kW at this stage of 
the game.  Sounds to me like you need a 20 kW or more depending on your true 
HVAC loads.  

 

From: Sterling Jacobson 

Sent: Saturday, February 8, 2020 6:04 PM

To: AnimalFarm Microwave Users Group 

Subject: [AFMUG] Generator for office

 

I need a smaller footprint generator for my 1300 sqr foot office.

 

Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that includes 
the 50A transfer switch.

 

I think my breakers has several 20A switches and 40A for the HVAC.

 

Not sure if this would cover the power needed for the whole unit, or just the 
fiber cabinet/rack I have that has max 20A circuit to it?

 

The next highest power draw is probably the HVAC and/or water heater.

 

The lights only draw about 500W since I switched them all to LED.

 

 




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Re: [AFMUG] Generator for office

[SmarterBroadband]

These are 12Kw and look to be smaller than the Generac?

 

https://www.nationwidegenerators.com/briggs-stratton-40517-12kw-generator/

 

https://www.nationwidegenerators.com/kohler-12resv-120-240v-1ph-generator-with-oncue-generator-management-system/

 

 

 

From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Sterling Jacobson
Sent: Monday, February 10, 2020 3:59 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] Generator for office

 

Good points.

 

Still, need a small form factor due to the building owner being obtuse about 
having a Gen on the back sidewalk.

 

So I’ll just wire the rack and maybe the lights for now and test it out.

 

3kw real output should cover those.

 

Also, I don’t want to have to excessively re-run my gas line to the unit, so 
the smaller NG gen the better and hopefully use the existing line given I’m not 
going to power the heat unit from NG at the same time the gen is on.

 

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of ch...@wbmfg.com <mailto:ch...@wbmfg.com> 
Sent: Sunday, February 9, 2020 7:03 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com> >
Subject: Re: [AFMUG] Generator for office

 

If your HVAC is 240 then you have more HVAC load than that generator can pull 
on just that one load.  

 

40 amps x 240 Volts is 9600 Watts.  

 

7.5 kW generac will only deliver 31 amps at 240 VAC  And you really don’t want 
to load a generator up that much.  50% is a good derating factor.  Also,  
generators publish their power output at sea level.  

 

Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees above 
70 degrees F

Rounding up, you are close to 5000’ so that is 15% lost for altitude and in the 
summer at 110 degrees that is another 8%.  

So you lose as much as 23% of capacity  on a hot summer day.  Worse if you 
power it from natural gas.  

 

I would add up all your loads, add 50% for growth then double that figure for 
not loading the generator too much and to account for derating.  

 

The installation is the expensive part.  Don’t scrimp on kW at this stage of 
the game.  Sounds to me like you need a 20 kW or more depending on your true 
HVAC loads.  

 

From: Sterling Jacobson 

Sent: Saturday, February 8, 2020 6:04 PM

To: AnimalFarm Microwave Users Group 

Subject: [AFMUG] Generator for office

 

I need a smaller footprint generator for my 1300 sqr foot office.

 

Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that includes 
the 50A transfer switch.

 

I think my breakers has several 20A switches and 40A for the HVAC.

 

Not sure if this would cover the power needed for the whole unit, or just the 
fiber cabinet/rack I have that has max 20A circuit to it?

 

The next highest power draw is probably the HVAC and/or water heater.

 

The lights only draw about 500W since I switched them all to LED.

 

 

  _  

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Re: [AFMUG] Generator for office

[Sterling Jacobson]

They said no for roof installation.

From: AF  On Behalf Of ch...@wbmfg.com
Sent: Monday, February 10, 2020 5:11 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] Generator for office

Roof?

From: Sterling Jacobson
Sent: Monday, February 10, 2020 4:58 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Generator for office

Good points.

Still, need a small form factor due to the building owner being obtuse about 
having a Gen on the back sidewalk.

So I’ll just wire the rack and maybe the lights for now and test it out.

3kw real output should cover those.

Also, I don’t want to have to excessively re-run my gas line to the unit, so 
the smaller NG gen the better and hopefully use the existing line given I’m not 
going to power the heat unit from NG at the same time the gen is on.


From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
ch...@wbmfg.com<mailto:ch...@wbmfg.com>
Sent: Sunday, February 9, 2020 7:03 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Subject: Re: [AFMUG] Generator for office

If your HVAC is 240 then you have more HVAC load than that generator can pull 
on just that one load.

40 amps x 240 Volts is 9600 Watts.

7.5 kW generac will only deliver 31 amps at 240 VAC  And you really don’t want 
to load a generator up that much.  50% is a good derating factor.  Also,  
generators publish their power output at sea level.

Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees above 
70 degrees F
Rounding up, you are close to 5000’ so that is 15% lost for altitude and in the 
summer at 110 degrees that is another 8%.
So you lose as much as 23% of capacity  on a hot summer day.  Worse if you 
power it from natural gas.

I would add up all your loads, add 50% for growth then double that figure for 
not loading the generator too much and to account for derating.

The installation is the expensive part.  Don’t scrimp on kW at this stage of 
the game.  Sounds to me like you need a 20 kW or more depending on your true 
HVAC loads.

From: Sterling Jacobson
Sent: Saturday, February 8, 2020 6:04 PM
To: AnimalFarm Microwave Users Group
Subject: [AFMUG] Generator for office

I need a smaller footprint generator for my 1300 sqr foot office.

Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that includes 
the 50A transfer switch.

I think my breakers has several 20A switches and 40A for the HVAC.

Not sure if this would cover the power needed for the whole unit, or just the 
fiber cabinet/rack I have that has max 20A circuit to it?

The next highest power draw is probably the HVAC and/or water heater.

The lights only draw about 500W since I switched them all to LED.



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Re: [AFMUG] Generator for office

[chuck]

Roof?

From: Sterling Jacobson 
Sent: Monday, February 10, 2020 4:58 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] Generator for office

Good points.

 

Still, need a small form factor due to the building owner being obtuse about 
having a Gen on the back sidewalk.

 

So I’ll just wire the rack and maybe the lights for now and test it out.

 

3kw real output should cover those.

 

Also, I don’t want to have to excessively re-run my gas line to the unit, so 
the smaller NG gen the better and hopefully use the existing line given I’m not 
going to power the heat unit from NG at the same time the gen is on.

 

 

From: AF  On Behalf Of ch...@wbmfg.com
Sent: Sunday, February 9, 2020 7:03 AM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] Generator for office

 

If your HVAC is 240 then you have more HVAC load than that generator can pull 
on just that one load.  

 

40 amps x 240 Volts is 9600 Watts.  

 

7.5 kW generac will only deliver 31 amps at 240 VAC  And you really don’t want 
to load a generator up that much.  50% is a good derating factor.  Also,  
generators publish their power output at sea level.  

 

Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees above 
70 degrees F

Rounding up, you are close to 5000’ so that is 15% lost for altitude and in the 
summer at 110 degrees that is another 8%.  

So you lose as much as 23% of capacity  on a hot summer day.  Worse if you 
power it from natural gas.  

 

I would add up all your loads, add 50% for growth then double that figure for 
not loading the generator too much and to account for derating.  

 

The installation is the expensive part.  Don’t scrimp on kW at this stage of 
the game.  Sounds to me like you need a 20 kW or more depending on your true 
HVAC loads.  

 

From: Sterling Jacobson 

Sent: Saturday, February 8, 2020 6:04 PM

To: AnimalFarm Microwave Users Group 

Subject: [AFMUG] Generator for office

 

I need a smaller footprint generator for my 1300 sqr foot office.

 

Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that includes 
the 50A transfer switch.

 

I think my breakers has several 20A switches and 40A for the HVAC.

 

Not sure if this would cover the power needed for the whole unit, or just the 
fiber cabinet/rack I have that has max 20A circuit to it?

 

The next highest power draw is probably the HVAC and/or water heater.

 

The lights only draw about 500W since I switched them all to LED.

 

 




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Re: [AFMUG] Generator for office

[Sterling Jacobson]

Good points.

Still, need a small form factor due to the building owner being obtuse about 
having a Gen on the back sidewalk.

So I’ll just wire the rack and maybe the lights for now and test it out.

3kw real output should cover those.

Also, I don’t want to have to excessively re-run my gas line to the unit, so 
the smaller NG gen the better and hopefully use the existing line given I’m not 
going to power the heat unit from NG at the same time the gen is on.


From: AF  On Behalf Of ch...@wbmfg.com
Sent: Sunday, February 9, 2020 7:03 AM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] Generator for office

If your HVAC is 240 then you have more HVAC load than that generator can pull 
on just that one load.

40 amps x 240 Volts is 9600 Watts.

7.5 kW generac will only deliver 31 amps at 240 VAC  And you really don’t want 
to load a generator up that much.  50% is a good derating factor.  Also,  
generators publish their power output at sea level.

Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees above 
70 degrees F
Rounding up, you are close to 5000’ so that is 15% lost for altitude and in the 
summer at 110 degrees that is another 8%.
So you lose as much as 23% of capacity  on a hot summer day.  Worse if you 
power it from natural gas.

I would add up all your loads, add 50% for growth then double that figure for 
not loading the generator too much and to account for derating.

The installation is the expensive part.  Don’t scrimp on kW at this stage of 
the game.  Sounds to me like you need a 20 kW or more depending on your true 
HVAC loads.

From: Sterling Jacobson
Sent: Saturday, February 8, 2020 6:04 PM
To: AnimalFarm Microwave Users Group
Subject: [AFMUG] Generator for office

I need a smaller footprint generator for my 1300 sqr foot office.

Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that includes 
the 50A transfer switch.

I think my breakers has several 20A switches and 40A for the HVAC.

Not sure if this would cover the power needed for the whole unit, or just the 
fiber cabinet/rack I have that has max 20A circuit to it?

The next highest power draw is probably the HVAC and/or water heater.

The lights only draw about 500W since I switched them all to LED.



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Re: [AFMUG] Generator for office

[Josh Luthman]

I'm asking out of curiosity.  My house is gas heat, so it's on a 15 amp
breaker (for the control board/thermostat).  My parents are on a mini split
and pellet stove.  Haven't seen a 40A hvac in a ~1300 sqft space.

Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373


On Mon, Feb 10, 2020 at 10:15 AM Adam Moffett  wrote:

> It's likely that there isn't 40A load on the 40A breaker.  The A/C
> installer would have sized it high if they had any brains.   However, the
> full picture here is that a bigger generator might cost a few thousand
> more, but buying it too small means buying it twice.
>
> If you cut it too close you can have the engine have trouble starting,
> stall when loads change, and wear out sooner than expected.  IMO you don't
> want "big enough", you want "excessively big".  I know I've harped on this
> point before, but if your two hot legs are unbalanced then there's more
> resistance on one side of the generator than the otherthe smaller the
> generator the easier it is to have problems with that.  How many people are
> bothering to check how well balanced the two hot legs are on their electric
> panel?  I got educated about that problem by an 8Kw generator with 13A on
> one leg and 2A on the other.  The engine ran noisy and stalled every few
> minutes, and we had to hastily rewire to fix it.  A bigger engine wouldn't
> have cared so much.  Chuck's suggestion of ((load + 50%) *2) is good sense
> for all of the above reasons.
>
> Also pick a Sunday morning sometime and shut off your main breaker for a
> few hours to see how well your generator carries everything.  You can turn
> the breaker back on if there's a problem, but if there's a problem during
> an outage you just have to suffer until it's over.
>
> -Adam
>
>
> On 2/10/2020 9:59 AM, Josh Luthman wrote:
>
> Is that 40A HVAC an electric heater or something?  That's massive.
>
> I have a 30A two ton mini split that only pulls about 9 amps (110) at full
> throttle heat.
>
> Josh Luthman
> Office: 937-552-2340
> Direct: 937-552-2343
> 1100 Wayne St
> Suite 1337
> Troy, OH 45373
>
>
> On Sun, Feb 9, 2020 at 9:04 AM  wrote:
>
>> If your HVAC is 240 then you have more HVAC load than that generator can
>> pull on just that one load.
>>
>> 40 amps x 240 Volts is 9600 Watts.
>>
>> 7.5 kW generac will only deliver 31 amps at 240 VAC  And you really don’t
>> want to load a generator up that much.  50% is a good derating factor.
>> Also,  generators publish their power output at sea level.
>>
>> Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees
>> above 70 degrees F
>> Rounding up, you are close to 5000’ so that is 15% lost for altitude and
>> in the summer at 110 degrees that is another 8%.
>> So you lose as much as 23% of capacity  on a hot summer day.  Worse if
>> you power it from natural gas.
>>
>> I would add up all your loads, add 50% for growth then double that figure
>> for not loading the generator too much and to account for derating.
>>
>> The installation is the expensive part.  Don’t scrimp on kW at this stage
>> of the game.  Sounds to me like you need a 20 kW or more depending on your
>> true HVAC loads.
>>
>> *From:* Sterling Jacobson
>> *Sent:* Saturday, February 8, 2020 6:04 PM
>> *To:* AnimalFarm Microwave Users Group
>> *Subject:* [AFMUG] Generator for office
>>
>>
>> I need a smaller footprint generator for my 1300 sqr foot office.
>>
>>
>>
>> Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that
>> includes the 50A transfer switch.
>>
>>
>>
>> I think my breakers has several 20A switches and 40A for the HVAC.
>>
>>
>>
>> Not sure if this would cover the power needed for the whole unit, or just
>> the fiber cabinet/rack I have that has max 20A circuit to it?
>>
>>
>>
>> The next highest power draw is probably the HVAC and/or water heater.
>>
>>
>>
>> The lights only draw about 500W since I switched them all to LED.
>>
>>
>>
>>
>>
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Re: [AFMUG] Generator for office

[Adam Moffett]

It's likely that there isn't 40A load on the 40A breaker.  The A/C 
installer would have sized it high if they had any brains. However, the 
full picture here is that a bigger generator might cost a few thousand 
more, but buying it too small means buying it twice.


If you cut it too close you can have the engine have trouble starting, 
stall when loads change, and wear out sooner than expected.  IMO you 
don't want "big enough", you want "excessively big".  I know I've harped 
on this point before, but if your two hot legs are unbalanced then 
there's more resistance on one side of the generator than the 
otherthe smaller the generator the easier it is to have problems 
with that.  How many people are bothering to check how well balanced the 
two hot legs are on their electric panel?  I got educated about that 
problem by an 8Kw generator with 13A on one leg and 2A on the other.  
The engine ran noisy and stalled every few minutes, and we had to 
hastily rewire to fix it.  A bigger engine wouldn't have cared so much.  
Chuck's suggestion of ((load + 50%) *2) is good sense for all of the 
above reasons.


Also pick a Sunday morning sometime and shut off your main breaker for a 
few hours to see how well your generator carries everything.  You can 
turn the breaker back on if there's a problem, but if there's a problem 
during an outage you just have to suffer until it's over.


-Adam


On 2/10/2020 9:59 AM, Josh Luthman wrote:

Is that 40A HVAC an electric heater or something? That's massive.

I have a 30A two ton mini split that only pulls about 9 amps (110) at 
full throttle heat.


Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373


On Sun, Feb 9, 2020 at 9:04 AM > wrote:


If your HVAC is 240 then you have more HVAC load than that
generator can pull on just that one load.
40 amps x 240 Volts is 9600 Watts.
7.5 kW generac will only deliver 31 amps at 240 VAC  And you
really don’t want to load a generator up that much.  50% is a good
derating factor.  Also, generators publish their power output at
sea level.
Knock off 3% for every 1000’ above sea level and 2% for every 10
degrees above 70 degrees F
Rounding up, you are close to 5000’ so that is 15% lost for
altitude and in the summer at 110 degrees that is another 8%.
So you lose as much as 23% of capacity  on a hot summer day. 
Worse if you power it from natural gas.
I would add up all your loads, add 50% for growth then double that
figure for not loading the generator too much and to account for
derating.
The installation is the expensive part.  Don’t scrimp on kW at
this stage of the game.  Sounds to me like you need a 20 kW or
more depending on your true HVAC loads.
*From:* Sterling Jacobson
*Sent:* Saturday, February 8, 2020 6:04 PM
*To:* AnimalFarm Microwave Users Group
*Subject:* [AFMUG] Generator for office

I need a smaller footprint generator for my 1300 sqr foot office.

Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00
that includes the 50A transfer switch.

I think my breakers has several 20A switches and 40A for the HVAC.

Not sure if this would cover the power needed for the whole unit,
or just the fiber cabinet/rack I have that has max 20A circuit to it?

The next highest power draw is probably the HVAC and/or water heater.

The lights only draw about 500W since I switched them all to LED.


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Re: [AFMUG] Generator for office

[Josh Luthman]

Is that 40A HVAC an electric heater or something?  That's massive.

I have a 30A two ton mini split that only pulls about 9 amps (110) at full
throttle heat.

Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373


On Sun, Feb 9, 2020 at 9:04 AM  wrote:

> If your HVAC is 240 then you have more HVAC load than that generator can
> pull on just that one load.
>
> 40 amps x 240 Volts is 9600 Watts.
>
> 7.5 kW generac will only deliver 31 amps at 240 VAC  And you really don’t
> want to load a generator up that much.  50% is a good derating factor.
> Also,  generators publish their power output at sea level.
>
> Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees
> above 70 degrees F
> Rounding up, you are close to 5000’ so that is 15% lost for altitude and
> in the summer at 110 degrees that is another 8%.
> So you lose as much as 23% of capacity  on a hot summer day.  Worse if you
> power it from natural gas.
>
> I would add up all your loads, add 50% for growth then double that figure
> for not loading the generator too much and to account for derating.
>
> The installation is the expensive part.  Don’t scrimp on kW at this stage
> of the game.  Sounds to me like you need a 20 kW or more depending on your
> true HVAC loads.
>
> *From:* Sterling Jacobson
> *Sent:* Saturday, February 8, 2020 6:04 PM
> *To:* AnimalFarm Microwave Users Group
> *Subject:* [AFMUG] Generator for office
>
>
> I need a smaller footprint generator for my 1300 sqr foot office.
>
>
>
> Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that
> includes the 50A transfer switch.
>
>
>
> I think my breakers has several 20A switches and 40A for the HVAC.
>
>
>
> Not sure if this would cover the power needed for the whole unit, or just
> the fiber cabinet/rack I have that has max 20A circuit to it?
>
>
>
> The next highest power draw is probably the HVAC and/or water heater.
>
>
>
> The lights only draw about 500W since I switched them all to LED.
>
>
>
>
>
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Re: [AFMUG] Generator for office

[chuck]

If your HVAC is 240 then you have more HVAC load than that generator can pull 
on just that one load.  

40 amps x 240 Volts is 9600 Watts.  

7.5 kW generac will only deliver 31 amps at 240 VAC  And you really don’t want 
to load a generator up that much.  50% is a good derating factor.  Also,  
generators publish their power output at sea level.  

Knock off 3% for every 1000’ above sea level and 2% for every 10 degrees above 
70 degrees F
Rounding up, you are close to 5000’ so that is 15% lost for altitude and in the 
summer at 110 degrees that is another 8%.  
So you lose as much as 23% of capacity  on a hot summer day.  Worse if you 
power it from natural gas.  

I would add up all your loads, add 50% for growth then double that figure for 
not loading the generator too much and to account for derating.  

The installation is the expensive part.  Don’t scrimp on kW at this stage of 
the game.  Sounds to me like you need a 20 kW or more depending on your true 
HVAC loads.  

From: Sterling Jacobson 
Sent: Saturday, February 8, 2020 6:04 PM
To: AnimalFarm Microwave Users Group 
Subject: [AFMUG] Generator for office

I need a smaller footprint generator for my 1300 sqr foot office.

 

Was thinking of getting the 50A 7.5KW Generac 6998 for $2050.00 that includes 
the 50A transfer switch.

 

I think my breakers has several 20A switches and 40A for the HVAC.

 

Not sure if this would cover the power needed for the whole unit, or just the 
fiber cabinet/rack I have that has max 20A circuit to it?

 

The next highest power draw is probably the HVAC and/or water heater.

 

The lights only draw about 500W since I switched them all to LED.

 

 




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