Installation manual

PV Planning
153396 Revision D 2–3
This manual is for use by qualified installers only
PV Planning
To determine the number of photovoltaic panels that are required for the PV
power plant, please use the PV planning tool from the Schneider Electric website:
1. Go to www.schneider-electric.com.
2. Open the Products and Services tab and click Renewable Energies.
3. Navigate to your specific product page.
4. Click Sizing Tools.
Environmental Requirements
The following environmental conditions must be established and maintained to
ensure the safe and efficient operation and servicing of the Xantrex GT250.
Adequate space must be provided around the unit for ventilation and access
during servicing. Whether locating the unit indoors or outdoors, the ambient air
temperature must be within the minimum and maximum temperature range for
which the unit is rated. See Table A-1, “Environmental Specifications” on page A–2.
• Maintain a minimum clearance of 800 mm (31.5 in) in front and 305 mm
(12 in) above of the Xantrex GT250 enclosure, plus local safety requirements
for maintenance and serviceability. The Xantrex GT250 has a zero (0 mm)
clearance requirement at the rear and sides of the enclosure. Figure 2-3,
“Conduit Entries Above Ground, Multiple Views” on page 2–7.
• External cabling interfacing with the Xantrex GT250 may enter from either the
bottom, lower sides, or lower rear of the enclosure. The Xantrex GT250 may
be placed over a foundation hole which holds the cables, or placed on top of
a hollow platform which allows access to the bottom of the Xantrex GT250.
• If the Xantrex GT250 is to be installed indoors and external air is used for
ventilation, the required liter per minute (L/M) rate must be no less than
65,000 L/M (2300 CFM). This assumes the temperature inside the building is
allowed to rise 10 °C (18 °F) above the outside temperature. Therefore, the
maximum allowable outside ambient temperature is 50 °C (50 °C minus
10 °C equals 40 °C Maximum Ambient Temperature) or 122 °F (122°F minus
18 °F equals 104 °F Maximum Ambient Temperature). Additionally for indoor
installations, the Xantrex GT250 enclosure has provisions for an exhaust air
duct to be attached, by means of two 355 x 200 mm (14 x 8 in) openings at
the top of the enclosure. The Xantrex GT250 enclosure rain hood must be
removed in order to access the exhaust openings.
If air conditioning is planned, the heat load of the Xantrex GT250 is
34,000 BTU/Hour at full load.
• The Xantrex GT Series inverter is designed to operate in -20 °C to 50 °C
(Xantrex GT250 480 and Xantrex GT250 480 PG) or -35 °C to 45 °C (Xantrex
GT250 600) ambient environment. Direct solar radiation can raise the internal
temperature beyond these specifications causing the Xantrex GT250 to trip
on an over-temperature fault and cease operation. If the inverter is subject to
high ambient conditions, the inverter must be shaded by using either a
shading structure or placing the inverter on the side of the building that get’s
the least amount of direct sunlight.