From: 1e8dbacd6cbe854c1c2e33544319180f@example.com   
      
   looking for a run capacitor to the 5 HP Doerr motor powering the families air   
   compressor... no-one knows or has documentation as to what is supposed to   
   be... and the cap in it is rusted beyond legibility. compressor is Emglo model   
   Y5B-80V serial    
   102588029 powered by a Doerr 5HP Motor 5 hp probably made 1988 as that is when   
   the pressure tank was made. the UL and CSA file on it is LR13758 label reads:   
   5HP 1 Phase 1740 Rpm m184t frame Mtr ref: r75334af881 thinking this is like a   
   model number...    
   60Hetz, 230 volts, 23.0 amps, SF amps 24.5, SF 1.15 insulation class BR type   
   TX KVA code G and then a final long number in the bottom right that is not   
   labeled is 20(B or 8)046370200 ....it says everything but does not tell me the   
   capacitor sizes. would    
   appreciate a call if someone can educate me on this.. wife is pissed the   
   compressor is still preventing me from finishing cleaning the garage...  I am   
   at the point where I want to simply measure current draw and try to dial in a   
   size iteratively. however,   
    I am not sure what my target characteristic setup should be and I am hoping   
   you would advise 773-2258558 is my cell Mark...I used formulas from websites   
   and calculated 98uF if its 84 percent efficient and 91uF if its 78 percent   
   efficient but the    
   efficiency is not specified and I dont know how to extract it from the data   
   available... more importantly another website says a 5hp run cap is never over   
   40uF so I am begging for help.. will venmo or quickpay BEER MONEY! already   
   replaced bearing and    
   cleaned and painted this compressor up..   
   snippits from emails I sent to allot of people that may be applicable but   
   basically someone has this motor and if they could remove the cover and tell   
   me what the cap is supposed to be I WOULD LOVE YOU FOR IT   
      
   since the efficiency is not specified on the label I am uncomfortable doing   
   the calculation with a 75percent approximation which also gives me an   
   uncomfortable 88.14uF Capacitor and it goes up from there...98.71uF for 84   
   percent efficiency using this    
   formula....   
      
   The single-phase capacitance C(µF) in microfarad is equal to 1000 times the   
   product of power P(W) in watts and efficiency η divided by the product of   
   voltage V(V) in volts square and the frequency F(Hz).  The formula for   
   calculating capacitor value is   
      
   C(µF) = (P(W) x η x 1000) / (V(V) x V(V) x f)   
      
   found on this website calculator:   
      
   Single phase Motor Capacitor Calculation calculator | Electrical4u   
      
   Maybe this was supposed to be a starting capacitance? but what's in there now   
   is much bigger. This has been occupying my mind for months   
   and months', searching for a solution...wife is going nuts so i have to finish   
   this compressor off to finish the garage clean up... thinking of trying a 30   
   uF and then increasing receiving current draw by trial and error on the two   
   legs of the single    
   phase electrical connection and searching for the capacitance value resulting   
   in smallest current but I am just guessing at this point ... what I am   
   thinking is the motor actually spun over in the winter with the blown   
   capacitor so as long  as I do not    
   exceed the capacitance I believe I won't damage the motor, I really would   
   appreciate learning a good method of getting to a value as this is not the   
   first time in my life this would have been useful and I'm pretty sure it won't   
   be the last..... I am in a    
   dangerous state, I don't know what I don't know.   
   https://www.polytechforum.com/img/n9n   
   https://www.polytechforum.com/img/n9p   
   https://www.polytechforum.com/img/n9r   
   https://www.polytechforum.com/img/n9t   
   https://www.polytechforum.com/img/n9v   
   https://www.polytechforum.com/img/n9x   
      
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   For full context, visit https://www.polytechforum.com/electrical   
   run-capacitor-sizing-cannot-determine-original-size-and-no-1550939-.htm   
      
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