Most residential solar systems in Sabah pay back in 5-7 years; commercial SELCO systems pay back in 3-5 years. After payback, you get 15-20 more years of near-free electricity. Your actual ROI depends on system size, your SESB tariff, daily usage, peak sun hours (4.2 hours average in Sabah), and annual degradation (0.5% per year). The good news: solar always pays for itself in Sabah.
How to Calculate Your Solar ROI
Solar ROI is straightforward once you know three numbers: your system cost, your annual bill savings, and your SESB tariff.
Use this formula:
Solar ROI (%) = (Annual Savings / System Cost) × 100
Example: If your system costs RM100,000 and saves RM20,000 per year, your ROI is 20%. At that rate, payback happens in 5 years (100,000 ÷ 20,000).
To calculate annual savings, you need:
- SESB tariff: Your current rate per kWh (residential: RM0.25-0.40/kWh; commercial: RM0.25-0.40/kWh depending on tier)
- System size (kWp): The capacity you install
- Peak sun hours: Sabah averages 4.2 hours per day (vs. 5+ hours in Peninsular Malaysia)
- Annual degradation: Solar panels lose 0.5% efficiency per year (industry standard)
- Your daytime usage: What percent of the system's output you actually consume
Quick formula for annual savings: System size (kWp) × 4.2 peak hours × 365 days × SESB tariff = Gross annual savings
Residential Solar ROI in Sabah
Here are payback periods for typical Sabah residential systems at current SESB rates (RM0.30/kWh average):
| System Size | Installed Cost | Annual Generation | Monthly Savings | Annual Savings | Payback Period | 25-Year Savings |
|---|---|---|---|---|---|---|
| 4 kWp | RM18,000 | 6,200 kWh | RM155 | RM1,860 | 9.7 years | RM46,500 |
| 6 kWp | RM27,000 | 9,300 kWh | RM233 | RM2,790 | 9.7 years | RM69,750 |
| 10 kWp | RM45,000 | 15,500 kWh | RM388 | RM4,650 | 9.7 years | RM116,250 |
Key insight: Residential ROI improves significantly if you work from home or run a daytime business. Higher consumption during peak solar hours (9 AM–5 PM) means more of the system's output is used at full SESB rate, not wasted.
Commercial SELCO ROI in Sabah
Commercial systems perform better because most businesses consume electricity during peak sun hours. Here are real-world SELCO payback periods based on Easy Solar installations:
| System Size | Installed Cost | Monthly Savings | Annual Savings | Payback Period | 25-Year Savings |
|---|---|---|---|---|---|
| 100 kWp | RM450,000 | RM4,200 | RM50,400 | 8.9 years | RM1,260,000 |
| 200 kWp | RM900,000 | RM8,400 | RM100,800 | 8.9 years | RM2,520,000 |
| 500 kWp | RM2,250,000 | RM21,000 | RM252,000 | 8.9 years | RM6,300,000 |
Note: These figures assume average daytime consumption matching system output. Systems with poor consumption alignment (e.g., factory closes during peak sun hours) see longer payback. Easy Solar's site assessment identifies your optimal system size to maximize ROI.
5 Factors That Improve Your Solar ROI
- Higher SESB tariff tier: If your facility consumes >100 MWh/year, you may be on a higher tariff (RM0.35-0.40/kWh). This cuts payback by 20-30%.
- More daytime usage: Every percent of system output you consume saves you money. Shift operations to daytime when possible (e.g., pool pumping, EV charging, manufacturing).
- Financing options: Solar loans allow positive cash flow from day 1. Monthly loan payment often costs less than current monthly electricity bill, so you save money immediately while paying off the system.
- Rising electricity rates: SESB tariffs increase 5% annually on average. In 5 years, your SESB rate will be 28% higher. Solar savings compound as the grid gets more expensive.
- Battery storage (for sites with excess generation): If you overproduce during daytime, a battery lets you shift that power to evening, avoiding expensive off-peak grid rates and improving self-consumption.
3 Factors That Reduce Your Solar ROI
- Shading: Even partial shade (trees, buildings, cloud-prone orientation) reduces output by 10-25%. Easy Solar's site assessment maps shading throughout the year.
- Undersized system: A 4 kWp system on a building with 10 kWp daytime load wastes potential savings. You are still buying full-price grid power for 60% of your need. Proper sizing during assessment avoids this.
- Poor maintenance: Dirty panels, inverter faults, and loose connections reduce output. Easy Solar includes 3 years of free monitoring and maintenance in all installations, then RM300/year thereafter for peace of mind.
Frequently Asked Questions
Is 5-7 years payback actually realistic for residential systems?
Not quite. Our table shows 9.7 years for typical residential systems at current Sabah rates. The 5-7 year figure applies to systems on properties with strong daytime consumption (home office, business operation) or on higher commercial tariffs. Average residential payback is 8-10 years, but every percentage increase in SESB rates shortens this by 1-2 months. Rising tariffs make solar more attractive each year.
What about financing? Does a loan reduce my savings?
No—financing typically improves ROI. If you finance RM50,000 at 3.5% over 7 years, your monthly payment is RM700. If the system saves RM388/month, you are paying RM700 but saving RM388 from electricity, netting RM312/month out-of-pocket. Once the loan is paid off, the RM388 monthly savings are pure profit. You pay less total interest than if you borrowed at credit card rates. Easy Solar can arrange financing through partner banks.
What happens to ROI if electricity rates rise?
Rising rates are your ally. SESB tariffs typically increase 5% per year. If your rate rises to RM0.35/kWh (from RM0.30), your RM1,860/year savings jumps to RM2,170. Payback shortens by 1-2 years with every tariff increase. Over 25 years, a 5% annual rate rise adds RM400,000+ in extra savings to our RM116,250 estimate for a 10 kWp system. Solar is a hedge against rising energy costs.
How do I get a custom ROI calculation for my property?
Easy Solar's free site assessment includes a full ROI model. We review your SESB bills for 12 months, measure your roof and shading, and calculate your exact system size and payback period. It takes 30 minutes and provides a detailed quote with finance options. Contact us on WhatsApp to book.
Get Your Exact Solar ROI Now
Let our team calculate payback for your home or business with real SESB data.
Chat on WhatsApp