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Residential Case Study

Mont Kiara Terrace House: From RM780 to RM0 Monthly Bill

Mont Kiara, Kuala Lumpur
August 2024

Bill Reduction

100%

Annual Savings

RM 9,384

Payback

4.8 years

CO2 Offset

12.5 tons/year

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

The Challenge

Tech-savvy family of 5 with heavy AC usage, home office, and EV charging. Monthly bill consistently exceeded RM780 despite energy-conscious behavior.

Monthly Bill (Before)

RM 782

Annual Cost (Before)

RM 9,384

Pain Points:

  • 24/7 AC in master bedroom and home office
  • EV charging 3x per week (Nissan Leaf)
  • Home theatre and gaming setup
  • Bill increased 35% over 3 years
  • Concerned about future tariff hikes

The Solution

System Size

10.4 kW

Installation Time

2 days

Solar Panels:

Longi Hi-MO 6 (520W, 26 panels)

Inverter:

Sungrow SG10RT (10kW hybrid inverter)

Special Features:

  • Optimized panel layout for afternoon sun (west-facing roof)
  • Hybrid inverter enabling future battery add-on
  • Real-time monitoring via mobile app
  • EV charger integration for daytime charging

The Results

Monthly Bill (After)

RM 0

Annual Savings

RM 9,384

ROI

21% IRR

Environmental Impact:

12.5 tons/year (equivalent to planting 282 trees)

TNB Bill Breakdown Analysis

Before Solar

Energy Charge (1,180 kWh @ RM0.571)RM 673.78
Service Charge (TNB)RM 3.00
KWTBB (1% of energy)RM 6.74
1% GST ReplacementRM 6.83
ICPT Surcharge (Q4 2025)RM 91.40
TotalRM 782.00

After Solar

Energy Charge (45 kWh @ RM0.218)RM 9.81
Service Charge (TNB)RM 3.00
Solar ATAP Export Credit (-53 kWh)-RM 11.55
Net BillRM 0.00
TotalRM 0.00

12-Month Performance

Jan
RM 745
RM 0
1280 kWh
Feb
RM 765
RM 0
1245 kWh
Mar
RM 782
RM 0
1310 kWh
Apr
RM 798
RM 0
1265 kWh
May
RM 815
RM 0
1290 kWh
Jun
RM 825
RM 0
1305 kWh
Jul
RM 812
RM 0
1295 kWh
Aug
RM 795
RM 0
1310 kWh
Sep
RM 778
RM 0
1275 kWh
Oct
RM 762
RM 0
1240 kWh
Nov
RM 748
RM 0
1165 kWh
Dec
RM 735
RM 0
1180 kWh
Before Solar
After Solar

We were skeptical about achieving RM0 bills, but Trexon delivered exactly as promised. The daytime EV charging strategy they suggested was genius—my Nissan charges from pure solar every afternoon. ROI payback in under 5 years is unbeatable.

Mr. David Lim

Fintech Director

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