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DESIGN THE SOLAR CHARGER CONTROLLER - EXAMPLE 3
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When BSC BS 40 PV modules
are used for a 120 Wp solar
home system (See
specifications of PV
modules)
Figure A Example of
choosing MPPT solar charge
controller for a 120 Wp
solar home system
by using 3 modules of 40 Wp
Bangkok Solar BS 40 PV
module connected in parallel
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) = (120 Wp) / 12
= 10.A
• Find out YY by multiply CC
by safety factor (NEC
requirement) = (10) x 1.2 =
12 A
• Select SOLARCON SPT-series
model that covers YY,
SOLARCON SPT-1212
• Check that Vpm(system) is
in range that SPT-XXYY can
handle (MPPT voltage range)
• If PV modules are in
parallel, need to check that
Vpm(system) = Vpm(module) =
44.8 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
parallel, need to check that
Voc(system) = Voc(module) =
62.2 Vdc
(Maximum open circuit
voltage = 96 Vdc)
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