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🇻🇳 Solar Calculator Vietnam

Enter your monthly EVN bill and city — get solar system size, panel count, cost in VND, EVN net metering savings, and payback period for Vietnamese homes and businesses.

Your electricity usage
₫VND
kWp
Vietnam solar estimate 🇻🇳
3 kWp system — 6 × 550W panels
Monthly EVN usage (est.)352 kWh/mo
Annual solar production3.329 kWh/yr
System cost range₫45 triệu – 54 triệu
Monthly EVN savings₫629.975/mo
Annual savings₫7,6 triệu/yr
Payback period6.5 years
25-year savings₫335,8 triệu
EVN net metering: Vietnam's rooftop solar policy (Decision 13/2020 and updates) allows excess generation to be exported to EVN grid. Export is credited at ~85% of retail rate. Southern cities (HCMC, Nha Trang, Can Tho) produce significantly more energy than Hanoi due to higher solar irradiance.
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How to Use This Calculator

Enter your EVN bill and city

Enter your monthly EVN (Electricity of Vietnam) bill in VND. Select your city — southern cities like Can Tho (5.0 PSH), Nha Trang (5.2 PSH), and Ho Chi Minh City (4.8 PSH) receive significantly more solar radiation than Hanoi (3.8 PSH). This directly affects how much electricity your system produces. Select your EVN tariff tier — households in higher tiers (Tier 4–6 at 2,860–3,302 VND/kWh) get the fastest solar payback because they save more per kWh offset.

Set your system size and installation type

Enter your desired system size in kWp. A small apartment typically installs 3–5 kWp; a house 5–10 kWp; factories 50–500 kWp. Rooftop systems are standard for homes; ground-mounted systems suit factories and farms but cost about 15% more. The calculator shows system cost in VND using the 2026 average range of 15–18 million VND per kWp installed.

Read the results

Results show panels needed (550W modules), system cost range, monthly and annual EVN bill savings, payback period, and 25-year savings. Vietnam's net metering policy (EVN buys excess at ~85% of retail rate) is factored in.

The Formula

Monthly kWh = Monthly Bill ÷ EVN Tariff Rate (VND/kWh) Annual Production = System kWp × PSH × 365 × 0.80 efficiency Panels = System kWp × 1,000 ÷ 550W (round up) System Cost = kWp × 15,000,000–18,000,000 VND Annual Savings = Self-consumed kWh × Rate + Exported kWh × Rate × 0.85 Payback = System Cost ÷ Annual Savings

Vietnam's tiered EVN tariff means households consuming over 400 kWh/month pay 3,302 VND/kWh for that usage — nearly double the Tier 1 rate. Solar offsets the highest-cost kWh first, making it especially valuable for high-consumption households. The 25-year savings model assumes 5% annual electricity price increases (Vietnam's historical average) and 0.5%/year panel degradation.

Example

Nguyen family — Ho Chi Minh City, 5 kWp rooftop

The Nguyen family pays 1,500,000 VND/month to EVN in Ho Chi Minh City. They install a 5 kWp rooftop system.

Monthly bill₫1,500,000 VND
City / PSHHo Chi Minh City, 4.8 PSH
EVN tariff tierTier 4 (2,860 VND/kWh)
System size5 kWp (10 × 550W panels)
InstallationRooftop

Result

Annual production~7,008 kWh/yr
System cost75–90 triệu VND
Monthly savings~1,670,400 VND/mo
Annual savings~20,044,800 VND/yr
Payback~4.1 years
25-year savings~950 triệu VND

Southern Vietnam's high solar irradiance and tiered EVN tariffs create excellent solar economics. A 5 kWp system in HCMC typically pays back in 4–5 years, with 20+ years of savings afterward.

FAQ

Vietnam's rooftop solar policy (Decision 13/2020 and subsequent updates) allows households and businesses to connect rooftop solar to the EVN grid. Excess electricity you don't use is exported to EVN and credited on your bill. The export rate is approximately 85% of the retail tariff rate. You need a bi-directional meter installed by EVN. The net billing process requires registration with your local EVN office and typically takes 2–4 weeks for approval.
Nha Trang (5.2 PSH) and Can Tho (5.0 PSH) have the highest solar irradiance in Vietnam, followed by Ho Chi Minh City (4.8 PSH). Da Nang (4.5 PSH) and Hue (4.2 PSH) are mid-range. Hanoi (3.8 PSH) has significantly lower solar resource due to northern latitude and cloud cover, especially November–February. A 5 kWp system in Nha Trang produces about 37% more electricity per year than the same system in Hanoi. Southern Vietnam is in the top-tier solar zones globally.
A complete rooftop solar system in Vietnam costs approximately 15–18 million VND per kWp installed in 2026. A 5 kWp residential system costs roughly 75–90 million VND all-in. Prices vary by brand (imported vs. domestic panels), inverter quality, and installer. Vietnamese-assembled solar panels (using local components) are cheaper but may carry lower warranties. Tier-1 imported panels (Longi, JA Solar, Jinko) with quality inverters (Growatt, Sungrow, SMA) are recommended for 25-year warranties.
Yes — Vietnam has excellent solar resources (especially the south), rapidly rising EVN tariffs, and competitive installation costs. Southern Vietnam households in Tier 4–6 see payback periods of 4–6 years. Hanoi residents in lower tiers see 7–9 year paybacks. Vietnam's EVN tariffs have historically increased 5–8% per year, making future savings even larger. The 25-year panel lifespan means 15–20 years of near-free electricity after payback. Factories and commercial users often see the fastest payback due to high daytime electricity consumption.
System size depends on your electricity usage and roof space. Typical Vietnamese homes need: Apartment: 3 kWp (6 panels, ~15m² roof). Town house: 5 kWp (10 panels, ~25m² roof). Villa: 8–10 kWp (15–20 panels, ~40–50m² roof). Shop house: 5–15 kWp depending on load. Each kWp requires about 5m² of unshaded roof space. In HCMC, 1 kWp produces about 1,402 kWh/year; in Hanoi about 1,109 kWh/year.

Related Calculators

☀ Solar Panel Calculator
Universal panel sizing from daily kWh and location.
📈 Solar Savings Calculator
25-year electricity savings from rooftop solar.
⏱ Solar Payback Calculator
Detailed payback with electricity price escalation.
⚡ Net Metering Calculator
Estimate export credits under net billing policy.

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