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PTO Generator
I see everyone has covered the horsepower required to power the generator but what about how you feed the system. You mention using a welding outlet and backfeed through it. What amperage/voltage is this receptacle. I am assuming a 240/120 volt single phase system and guessing the receptacle is about 30 amperes. This will yield a 7.2 kw backfeed so a 12 kw or a 25 kw would be more than you could use. For 12 kw you would need a 50 ampere receptacle and for 25 kw you would need a 150 ampere breaker. Also consider that these are probably 220/1 phase receptacles and do not have a neutral. You will need the neutral for 120 volt loads. Hope I haven't confused the issue.
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PTO Generator
Jim, you can use a three phase generator for single phase loads but as the generator rep/manufacturer said you will have an unbalanced load. To alleviate this will require that you system be reworked somewhat. If you are fortunate enough to have multiple panelboards, the system could be setup for say panel 1 to use phases A and B while panelboard 2 could use phases B and C. Even under this arrangement as you see phase B will likely have a heavier load than phases A and C. To more evenly balance would require three panelboard and setup AB, BC and CA. As you probably notice, it starts to get a bit involved. Hope this helps.
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PTO Generator
No. 2 aluminum is good for 90 amperes
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Jim,OK, where to start....first the transfer switch, no it doesn't have to go between the meter and the main unless you are trying to serve everything on the system. By the way a transfer switch is nothing more than a fool proof way of opening one breaker before closing another, no big deal. As to your other questions, you mentioned a 25 and a 12 kw generator. A 25 kw at 240 volts single phase will produce 104 amperes and I will bet the 25 kw rating is at an 80% power factor so that the generator is really good for 130 amperes. You probably really don't need this much and really couldn't make use of it with the setup as you described so I lean towards a smaller unit. If you go with the 12 kw machine and it is a 3 phase model it would be good for 42 amperes per phase A-B-C. This would work with your 60 ampere single phase welding outlet and things would work as-is. Down side is the one phase would be unloaded unless you set up a dummy load in your shop, which is an idea. This dummy load could be a heater or almost anything just to dissipate the extra energy generated, preferably a 120 volt load so as to use phase A or B or C.I am happy to help you out with this, but I think you need to make some decisions about what size unit, phase configuration and whatever. After that give me a shout and will try to help you work it out. Also, it would probably work better to contact me offline at my email address.Good luck and let me know what I can do to help.
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Bill, OK let me make sure I am answering your question. Yes, to most residential structures are 220/120 single phase. This would conist of two phase conductors, a neutral and a ground established at the residence (not from utility). Now for your welding outlet, or any other outlet as that goes, you do want the same setup, two phase conductors and a neutral, if there is a ground great but you are acting just like the utility here. So ground the generator and you are already grounded at your panelboard. As for voltage readings, you should have 220 between your two phase conductors and 120 between any phase conductor and the neutral/ground (these two are really connected together). Hope this all makes sense but if not, feel free to email me directly and I will try to help.BTW are you here in NC? If so, I am located in Durham and small world.
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