PV 250, Lesson 5
PV Array

The PV Array consists of sixteen Astropower AP-100 PV modules. The array is configured for 48- volts (nominal) as determined by the selection of the inverter. The GC-1000 inverter by AES is designed to operate with a 48-volt array. (More on the inverter in Lesson 6).

The array is therefore configured into 4 sub-arrays, each having 4 modules in series to operate at 48 volts. Each 48-volt sub-array is run directly to the inverter.

The PV array was mounted on the roof at approximately a 30-degree angle. (Did anyone get the actual roof pitch?). The roof has a True South orientation but has some shading which can be seen in the Pathfinder image below. All the options were considered at a Pre-installation site visit by Ed and Ken with Chris in May. We had originally considered putting 4 of the modules on a Pole in the yard, but shading was an issue there as well (See below).

The module specifications given on the label on the back of the module:

Open Circuit Voltage, Voc: 20.1 DC
Rated Voltage (@max power), Vmp: 16.1 Volts
Short Circuit Current, Isc: 7.2
Rated Current (@max power),Imp: 6.2 amps
Maximum Series Fuse: 15 amps
Maximum System Open Circuit: 600 volts

The module is UL listed.

The PV sub-array specifications, with 4 modules in series, therefore are as follows:

Open Circuit Voltage, Voc: 80.1 volts DC
Rated Voltage (@max power), Vmp: 48.4 Volts
Short Circuit Current, Isc: 7.2
Rated Current (@max power),Imp: 6.2 amps
Maximum Series Fuse: 15 amps
Maximum System Open Circuit: 600 volts

See PV Array Installation Photos

Frequently Asked Questions

1.1 Why don't more people use Photovoltaics now?

1.2 Can I run my whole house with solar electricity?

1.3 Can I heat my hot water with PV?

1.4 I live in the cloudy Northeastern US. Aren't PV systems mostly for sunny climates?

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