Example 1 Guide to design controller

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AN EXAMPLE

Calculate a solar system for a rural family with the below appliance:

- One 18w lamp used 4 hours per day
- One 60w electric fan used 2 hours per day.
- One 75w refrigerator runs 24 hours per day with compressor run 12 hours and off 12 hours..

1. Calculate PV panel

- Calculate total Watt-hours per day.

(18 W x 4h) + (60 W x 2h) + (75 W x 12h) = 1,092 Wh/day

- Calculate total Watt-hours per day needed from the PV modules.

Watt-hours (per day) needed from the PV modules = 1.3 x total Watt-hours per day.

= 1,092 x 1.3 = 1,419.6 Wh/day.
- Calculate the PV modules.

With panel generation factor at the site location = 4.58:

Total Wp of PV panel = 1,419.6 / 4.58 = 310Wp
With PV = 110Wp we need 310 / 110 # 3 PV modules

2. Calculate Battery

With 3 autonomy days, the battery capacity = 178 x 3 = 534 Ah # 600AH
WE have 3 battery 12VDC/200AH in parallel

3. Calculate solar charge controller
TPV module parameters:

Pm = 110 Wp, Vpm = 16.7 Vdc, Ipm = 6.6 A, Voc = 20.7 A, Isc = 7.5 A
With battery 12VDC, we choose SPT-12YY
With 310Wp -> charge current Ic = Wp/XX = 310/12 = 25.83A
YY = 1.2 x 10.67 = 31A, we choose YY=30
Solar charge controller: Leonics SPT-1230
PV module is serial connected:

Vpm = 16.7 x 3 = 50.1 VDC
Voc = 20.7 x 3 = 62.1 V

Vpm is in MPPT range of SPT-1230, from 26 – 75 VDC and Voc < Voc max = 96VDC

3. Calculate inverter
Total load = 18 + 60 + 75 = 153 W
For safety, the inverter should be considered 25-30% bigger size.
The inverter size should be about 200 W or greater.

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