PTO generator

[techman]

So when I clamp each leg of the 3 phase separately, do I just add the three surge readings together or take the highest surge reading and multiply by three?

To find watts with 3 phase, take the current, I would use the average of the 3 legs, and:

Voltage x current x 1.73 =watts; divide by 1000 for KW

The 1.73 is a factor (sqrt of 3) in order to correctly determine power in a 3 phase system.

paul

 

[yelbike]

So when I clamp each leg of the 3 phase separately, do I just add the three surge readings together or take the highest surge reading and multiply by three?

Nope, doesn't work that way. You have to rely on manufactures spec sheets. Even clipping it with a meter can be wrong. usually the better the meter, the faster response time, will clip a higher current on the same tested load.

 

[SPYDERLK]

So when I clamp each leg of the 3 phase separately, do I just add the three surge readings together or take the highest surge reading and multiply by three?

Nope, doesn't work that way. You have to rely on manufactures spec sheets. Even clipping it with a meter can be wrong. usually the better the meter, the faster response time, will clip a higher current on the same tested load.

To find watts with 3 phase, take the current, I would use the average of the 3 legs, and:

Voltage x current x 1.73 =watts; divide by 1000 for KW

The 1.73 is a factor (sqrt of 3) in order to correctly determine power in a 3 phase system.

paul

fred, I assume you will have a clamp meter with Peak Hold capability and will take the opportunity to play, think, and re play. Your biggest threat will be starting a hi draw motor when the system is already running a variety of loads. I know you have 3phase, but are all motor loads 3 phase? Is there a single stage air compressor or a big freezer. These could stall if their phase browns too badly ... and even if not stalling outright they would slow and draw more current on "their" phase, thus unbalancing the genny load. Your elevator motor should indicate virtually identical draw on all phases. You will be able to check its surge and running load and verify its balance in both situations. Then you could make measurements at your service panel input of your normal load on each ph, then your startup of the elevator combined [due reactive effects of other/normal loads this will not be a strict addition of elevator surge to the already measured normal load], and finally the continuous full steady state load. The last appears to be 21KW as I see it from the previous discussion.
... This info, and other combinations that you might see fit, will supply grist for better decisions on a minimal system.
larry

 

[David_Kb7uns]

Diesel can be stored for years if you keep moisture out as much as possible. An additive for fungus and to resist gelling is recommended. I have about 100 gal of heating oil for my kubota powered 10 KW genset. Sandy left us w/o power for about 70 hours. Ran the gen non stop on 1 yr old diesel with no problem. i also use the diesel for my tractor, but only fill about once a year. We sat in comfort and barely heard the genset running. 3 zones of geothermal heat pump worked flawlessly, as did the fridges, freezer, well, etc.

paul

Around here this is no longer possible since they addition of 5% biodiesel, so if you need long term storage diesel I have heard that you can possibly get straight diesel for standby generators. They are now recomending a 30-60 day turnover of the diesel fuel stock.

David Kb7uns

 

[avc8130]

Around here this is no longer possible since they addition of 5% biodiesel, so if you need long term storage diesel I have heard that you can possibly get straight diesel for standby generators. They are now recomending a 30-60 day turnover of the diesel fuel stock.

David Kb7uns

Is your home heating oil bio also?
ac

 

[David_Kb7uns]

Is your home heating oil bio also?
ac

As little a market there is for home heating oil out here I would suspect it is just dyed diesel fuel now. We do not even have a station in town that delivers it is all cardlock now.
This is the primary reason I went with a 20KW propane standby generator the propane does not degrade with time, we are only doing 40 hours per year average so far.

I went and checked on the state website and there is an exemption for home heating oil for the 5%, but the trick is finding it all the heating oil vendors are pushing between B20 and B100 heating oil.

And remember us Oregonians are too stupid to figure out the use of a gas pump, we must have a state trained high school dropout do it.

David Kb7uns

 

[avc8130]

As little a market there is for home heating oil out here I would suspect it is just dyed diesel fuel now. We do not even have a station in town that delivers it is all cardlock now.
This is the primary reason I went with a 20KW propane standby generator the propane does not degrade with time, we are only doing 40 hours per year average so far.

I went and checked on the state website and there is an exemption for home heating oil for the 5%, but the trick is finding it all the heating oil vendors are pushing between B20 and B100 heating oil.

And remember us Oregonians are too stupid to figure out the use of a gas pump, we must have a state trained high school dropout do it.

David Kb7uns

Wow, in NJ HHO is EVERYWHERE...and we are too dumb to pump our own gas too!

ac

 

[PineRidge]

As little a market there is for home heating oil out here I would suspect it is just dyed diesel fuel now.

David Kb7uns

David in my part of Ohio it is one and the same.

 

[TimP]

they are getting out of the PTO generator business. I bought out about the last 40-50 PTO generators they built, but they are done manufacturing. The company (Dynatech) is still in business and doing fine, they will continue to stand behind any warranty claims. They just where not finding the business profitable any longer.

Neil,

I checked out your website just now fro those Toger PTO Generators and the site states you are sold out of the PTO genny's.

If Tiger is not Mfg any more of them, how are you going to get more ?

Has DynaTech agreed to build more for you ?

Thanks, Tim

 

[tommu56]

This digital monitor comes with 4 wrap around clamps 2 large and 2 small. I clamped one around each of the incoming load legs from the meter. The probes then plug into the back of a small transmitter that will send the signal a couple of hundred feet to the receiver. It gives a read out in real time and stores a 2 year log I believe. The whole shebang is battery powered.

View attachment 287963

PineRige
do you have a link this meter sounds interesting

tom