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DESIGN THE SOLAR CHARGER CONTROLLER - EXAMPLE 2
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When SHARP NE-78T1 (type
1) or ND-130T1J (type 2) PV
modules are used for a
150-260 Wp solar home
system.
Type 1: Using 78 Wp SHARP
NE-78T1 PV module for a 150
Wp solar home system
Figure A: Example of
choosing MPPT solar charge
controller for a 150 Wp
solar home system
by using 2 modules of 78 Wp
SHARP NE-78T1 PV module
connected in series
Steps to consider for
choosing MPPT solar charge
controller
• SPT-XXYY
• Find out what is nominal
battery voltage that charge
controller will charge and
select XX = 12
• Find out what is Wp of PV
module and
• Select the suitable charge
current (CC) = (156 Wp) / 12
= 13 A
• Find out YY by multiply CC
by safety factor (NEC
requirement) = (13) x 1.2 =
15.6 A
• Select SOLARCON SPT-series
model that covers YY,
SOLARCON SPT-1220
• Check that Vpm(system) is
in range that SPT-XXYY can
handle (MPPT voltage range)
• If PV modules are in
series, need to check that
Vpm(system) = Vpm(module) x
Module in series
Vpm(system) = 17.1 x 2 =
34.2 Vdc (MPPT voltage range
= 26-75 Vdc)
• Check that Voc(system) is
not more than SPT-XXYY range
(Maximum open circuit
voltage)
• If PV modules are in
series, need to check that
Voc(system) = Voc(module) x
Module in series
Voc(system) = 21.4 x 2 =
42.8 Vdc (Maximum open
circuit voltage = 96 Vdc)
Type 2: Using 130 Wp
SHARP ND-130T1J PV module
for a 260 Wp solar home
system (See specifications
of PV modules)
Figure B Example of
choosing MPPT solar charge
controller for a 260 Wp
solar home system
by using 2 modules of 130 Wp
SHARP ND-130T1J PV module
connected in series
Steps to consider for
choosing MPPT solar charge
controller
• SPT-XXYY
• Find out what is nominal
battery voltage that charge
controller will charge and
select XX = 12
• Find out what is Wp of PV
module and
• Select the suitable charge
current (CC) = (260 Wp) / 12
= 21.66 A
• Find out YY by multiply CC
by safety factor (NEC
requirement) = (21.66) x 1.2
= 26 A
• Select SOLARCON SPT-series
model that covers YY,
SOLARCON SPT-1230
• Check that Vpm(system) is
in range that SPT-XXYY can
handle (MPPT voltage range)
• If PV modules are in
series, need to check that
Vpm(system) = Vpm(module) x
Module in series Vpm(system)
= 17.4 x 2 = 34.8 Vdc
(MPPT voltage range = 26-75
Vdc)
• Check that Voc(system) is
not more than SPT-XXYY range
(Maximum open circuit
voltage)
• If PV modules are in
series, need to check that
Voc(system) = Voc(module) x
Module in series Voc(system)
= 22.0 x 2 = 44.0 Vdc
(Maximum open circuit
voltage = 96 Vdc)
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