Chilicon Power.
(310) 800-1396
15415 Sunset Blvd, Suite 102, Pacific Palisades, CA 90272
TBT8-R2001
3) Calculate the voltage rise associated with the total length and wire size of
the cabling from the subpanel to the main service panel using the approach
outlined in Section 2. However, now use the total number of microinverters to
calculate the total current.
For percent voltage rise in Section 2 and 3, take the voltage calculated and
simply divide by the service voltage, either 240 or 208V.
Finally, add the values calculated in Section 1 and 2 for each subcircuit. Take
the largest value from this process and add to the value calculated in Section 3.
The total voltage increase should be such that the final voltage should not
exceed 264 V (229V for 208V) or 2%. Note: It is highly recommended that the
installer first measure the voltage at the panel box to confirm its initial value.
Should a system design result in a voltage in excess of the maximum permitted,
there are several approaches to remedy the situation:
1) Increase the wire gauge or shorten the distance to the service panel.
2) Center tap the connection to the microinverter subcircuits. This involves
splitting the subcircuit into two sections and connecting to the middle. This will
drop the voltage rise to less than half for that subcircuit.
3) For systems fed by a grid in excess of the standard voltage or for post-
installation correction, it is possible to increase the operational voltage range
of the Chilicon microinverters via the CP-100 gateway. Contact Chilicon
Power for additional information on this procedure.
* Please refer to Technical Bulletin TBT4: Power Limiting of Microinverters