Solar savings calculator
This solar and TNB bill calculator is a quick estimate for Malaysian homes: pick your monthly TNB bill to see your bill after solar, your savings, the system size you need and what it costs per month.
Your bill today
RM500
You use kWh a month and buy every unit from TNB.
Your bill after solar
RM
kWh bought from TNBRM
kWh exported to TNB−RM
Your savings
RM
% off your bill
Payback yrs
≈RM / 10 yrs
Adjust any of these
See how much you could save.
Make changes to match your home and usage. The results will update automatically.
0% Solar Now Pay Later
No banks, no credit card
10-year plan
RM /month
Net savings: RM /month
What you save each month after deducting your solar payment.
5-year plan
RM /month
Net savings: RM /month
What you save each month after deducting your solar payment.
Save more
Move the slider to see how using more of your solar electricity during the day can increase your savings.
More daytime usage
Shift more of your usage to daytime.
Shift the washer, dryer or EV charger usage into daylight.
You could save
RM
/month
a month
Increasing daytime solar usage from 30% to 45% costs nothing, just a change in habits. It can deliver better savings than investing in more panels.
All figures are estimates based on current TNB tariffs (general, non-ToU), Solar ATAP policy and your selected daytime electricity usage. Solar generation is estimated using an annual average of 3.4 peak sun hours per day, which can vary depending on roof design, tilt and orientation. Monthly fuel price adjustments (AFA) and the temporary SST and Retail Charge exemptions for electricity usage up to 800 kWh (1 September–31 December 2026) are not reflected in these calculations.
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Tell us where you live and your monthly TNB bill.
1
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2
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FAQs
Frequently asked questions
How much solar will I use directly?+
Direct Solar Usage ranges from 15% to 40%, depending on household consumption. Households with higher electricity consumption usually run more appliances during the day, so they use more solar directly. Here are some examples:
| Monthly TNB Bill | Estimated Direct Solar Usage (Without Energy Storage) |
| RM300 | 15-20% |
| RM500 | 20-25% |
| RM800 | 25-30% |
| RM1,000 | 30-35% |
| RM1,500 | 35-40% |
Why does daytime use matter?+
Solar Electricity is generated during the day (8am–6pm, peaking around 11am–3pm). The more you use while your system is generating, the more you save – since you avoid grid imports and all bill charges.
Would Time-of-Use (ToU) help me save more?+
ToU can lower your bill, but actual savings depend on how much of your weekday usage you can shift to off-peak hours (10pm–2pm).
What affects how much I save?+
Several factors can impact your savings:
- Roof design, tilt and orientation
- Shading from trees, buildings, or roof fixtures
- Excessive dust/pollution from surrounding areas
- Weather patterns
- Proper system maintenance
- Electricity consumption patterns
How else can I maximise my solar savings?+
- Use more appliances in the daytime (e.g. EV charger, washing machines)
- Minimise shading on your panels (e.g. relocate satellite dishes, prune trees)
- Maintain your system properly to ensure optimal generation