Tuesday, January 26,
WISA and IEEE Joint
Program: Solar Power
Speakers and Topics:
Balascio, P.E., Carew Associate, Inc.:
Power & Monitoring Design Basics for Solar PV
Balascio discussed three PV installations: two used PV
arrays; one also had passive solar.
- Site evaluation
- Funding and evaluation
- Design trade-offs
Ray Greenhalgh & Ryan Marlborough, United Electric Supply:
Solar PV System Design & Output Considerations
Talk given by Mike Howell.
System performance depends on:
- Location Insulation
- Temperature; as temp rises, voltage goes down
- Array direction, especially tilt relative to the ground.
- Shade – usually if some of the cells are shaded, the inverter has problems trying to find best voltage
- System components
> Solar module
Crystalline runs at 14% efficiency, runs better when weather cooler
* Thin film runs at 8-9% efficiency, runs better when warmer
Light induced degradation; crystalline can degrade 3%, thin film by 10-15 %.
- How the Array matched to the inverter(s).
Scott Bowden, Solectria Renewables, LLC:
Applications of Solar Grid-Tie Inverters
Talk given by Sid Shu
The company started out looking at electric cars.
Inverter reliability is a result of good transformers.
Simple to maintain
Types of inverter systems:
> Micro -- high frequency, used for less than 500 watts
> String of inverters – 20 kHz or less, used for less than 10 kw
> Central – 12 kHz or less, used for 10kw to 1MVA
Anti-islanding (the PV may continue to power when the
surrounding grid is down by using a turn-on/turn-off sequence)