Testing for Array Losses
fishin2day
Registered Users Posts: 1
Hi All
I'm new on this site I'm an installer and O & M Contractor from Ontario. I have recently ran into a request from one of my customers that has me scatching my head. So I thought I would try and put it out there and see what other guys are doing.
I've been ask to go to one of our 500kw roof top installations and test each string to the combiner and give the voltage drop or percent losses on that string as well as the losses on the home runs back to the Inverter. Now how do you test for vdrop as they want total losses from the module to the combiner so that includes the wiring on the array. Is there some way of getting a resistance test on a live circuit?
I'm new on this site I'm an installer and O & M Contractor from Ontario. I have recently ran into a request from one of my customers that has me scatching my head. So I thought I would try and put it out there and see what other guys are doing.
I've been ask to go to one of our 500kw roof top installations and test each string to the combiner and give the voltage drop or percent losses on that string as well as the losses on the home runs back to the Inverter. Now how do you test for vdrop as they want total losses from the module to the combiner so that includes the wiring on the array. Is there some way of getting a resistance test on a live circuit?
Comments
-
If you can measure voltage drop (or voltage at each end of the cable run) relatively accurately--Remember:
- V=IR
- R=V/I = change in voltage / change in current
- R= (245-242Vrms) / 10 amps rms = 0.3 Ohms
- R = delta V / delta I = (245-242) volts / (10-5) amps = 0.6 Ohms (estimated effective resistance)
-BillNear San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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