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Residential Case Study

Johor Bahru Semi-D: 92% Bill Reduction for Growing Family

Nusajaya (Iskandar Puteri), Johor Bahru
October 2024

Bill Reduction

92%

Annual Savings

RM 7,596

Payback

4.2 years

CO2 Offset

9.8 tons/year

Trexon Energy Team profile photo - Solar Installation Specialists
· Solar Installation Specialists

The Challenge

Multigenerational family (parents + grandparents + 2 kids) with high cooling needs. Monthly bills averaging RM685. Concerned about elderly parents' comfort during long hours at home.

Monthly Bill (Before)

RM 685

Annual Cost (Before)

RM 8,220

Pain Points:

  • AC running 16+ hours/day for elderly parents
  • Large home with high cooling costs
  • Work-from-home setup for both parents
  • Monthly bills increased 28% in 2 years
  • Wanted to future-proof against tariff hikes

The Solution

System Size

8.06 kW

Installation Time

1.5 days

Solar Panels:

Canadian Solar TOPHiKu7 (580W, 14 panels)

Inverter:

Growatt MOD 8KTL3-XH (8kW)

Special Features:

  • East-West optimized layout for all-day generation
  • Rapid TNB approval through Iskandar Malaysia fast track (11 days)
  • Smart meter integration for real-time monitoring
  • Designed for future battery expansion

The Results

Monthly Bill (After)

RM 52

Annual Savings

RM 7,596

ROI

24% IRR

Environmental Impact:

9.8 tons/year (equivalent to planting 221 trees)

TNB Bill Breakdown Analysis

Before Solar

Energy Charge (1,050 kWh @ RM0.571)RM 599.55
Service ChargeRM 3.00
KWTBB (1% of energy)RM 6.00
1% GST ReplacementRM 6.08
ICPT SurchargeRM 70.35
TotalRM 685.00

After Solar

Energy Charge (80 kWh @ RM0.218)RM 17.44
Solar self-consumption (970 kWh)RM 0.00
Service ChargeRM 3.00
KWTBBRM 0.17
Solar ATAP Export CreditRM 31.62
TotalRM 52.00

12-Month Performance

Jan
RM 665
RM 48
1045 kWh
Feb
RM 672
RM 50
1020 kWh
Mar
RM 685
RM 52
1070 kWh
Apr
RM 698
RM 55
1055 kWh
May
RM 710
RM 58
1065 kWh
Jun
RM 718
RM 60
1075 kWh
Jul
RM 705
RM 56
1068 kWh
Aug
RM 692
RM 53
1072 kWh
Sep
RM 678
RM 51
1050 kWh
Oct
RM 668
RM 49
1025 kWh
Nov
RM 660
RM 47
995 kWh
Dec
RM 655
RM 46
1005 kWh
Before Solar
After Solar

Our grandparents can now enjoy AC guilt-free. We went from rationing cooling to keeping the house comfortable 24/7—all while saving RM633/month. The Trexon team completed installation in 1.5 days during a weekend so we didn't miss work. Flawless execution.

Mrs. Jasmine Koh

Architect

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