There are several advantages of using a 1000Vdc inverter system:
- 8x more MPP tracking for greater energy harvest.
- 40%+ reduction in BOS cost.
- 0.5%+ Reduction in conducted losses (a.k.a. more energy).
- Elimination of external combiner boxes and subcombiner.
- Shorter total PV array cable length.
- Smaller cable size makes cable handling easier.
- More modules per string.
A 1000Vdc PV array allows for longer strings of modules than a 600Vdc PV array. Longer strings have more PV modules and thus more power per string. Because the strings will be wired with more modules, a 1000Vdc PV array will have fewer strings and fewer conductors to return to the integrated combiner box of the TRIO-20.0 or TRIO-27.6. The longer continuous strings can allow for easier optimization of the array layout on a rooftop which can further reduce the length of the conductors used in the array design. Because of these factors, a commercial roof top installation with a 1000Vdc PV array can result in up to a 40% reduction of the length of conductors and, due to the higher array voltage and thus lower current, it can also result in up to a 40% reduction in the conductor cross section.
A commercial PV system designed using a traditional 600Vdc PV array with a traditional central inverter requires the use of combiner boxes for each string and an array recombiner to combine the conductors from each combiner box before the inverter. Designing the same system utilizing a TRIO-27.6 or TRIO-20.0 with an integrated string combiner box eliminates the need for external combiner boxes along with the conductors and the associated labor. This can decrease installation costs by thousands of dollars in a 120kWdc PV System.
The DC Balance of System cost per watt is flat for PV systems utilizing the TRIO inverters since the components are limited to the DC conductors.