Section 3 Installation Design; Installation Design Worksheet - Generac Power Systems PV Link Installation Manual

Section 3 Installation Design

Installation Design Worksheet

Use this worksheet to determine the maximum
number of PV modules of a given type that
can be connected to a PV Link.
NOTE: Fewer PV modules can be used as
long as the minimum MPPT input voltage is
met.
1. Calculate an adjusted open circuit voltage
(VOC) for the module being installed using
the applicable NEC cold factor from
Table 1: NEC Cold
NOTE: The temperature correction factor
listed on the module nameplate can be used if
available.
Panel NEC Cold
VOC
X
2. Divide the PV Link Max VOC by the
Adjusted VOC from step 1 and round
down to determine the number of panels
that can be connected in series to the PV
Link without exceeding the open-circuit
voltage limit.
PV Link
Max VOC
÷
420 V
Minimum Temperature (°F)
49 to 41
40 to 32
31 to 23
22 to 14
-5 to -13
-14 to -22
-23 to -31
-32 and below
Installation Manual for PV Link and SnapRS
Factor.
Adjusted
Factor
=
Adjusted VOC Limit
VOC Result
=
Table 1 - NEC Cold Factor
13 to 5
4 to -4
3. Divide the PV Link VMP (Voltage at Maxi-
mum Power) by the panel VMP and round
down to determine the number of panels
that can be connected in series to the PV
Link without exceeding maximum power
voltage.
PV Link
Max VMP
360 V
4. Compare the results from step 2 and step
3 and choose the smaller number. Round
down to the nearest integer and record it
below. This is the maximum number of
modules of this type that can be con-
nected to the PV Link given the specified
VOC
NEC cold factor.
NEC Cold
Factor
1.08
1.10
1.12
1.14
1.16
1.18
1.20
1.21
1.23
1.25
Panel
VMP
÷
Maximum Panels per Substring
Minimum Temperature (°C)
9 to 5
4 to 0
-1 to -5
-6 to -10
-11 to -15
-16 to -20
-21 to -25
-26 to -30
-31 to -35
-36 and below
VMP
Limit
=
9