FULL CALCULATOR

Solar calculator: size a system for your home.

Tell us your home situation: city, PLN connection, monthly bill. We'll show you how much of your home can leave PLN behind, the system size required, and a 25-year cost trajectory. Every assumption is visible. The real numbers come later, on WhatsApp.

Primary goal

Energy independence first, savings second.

Solar's primary win isn't lower bills, it's freeing your home from PLN dependency: protected from yearly rate hikes, electricity costs locked for the next 25 years, blackout-safe. Savings come as a side effect once you're independent. Because Indonesia has no net metering, a battery is mandatory in every setup so daytime production isn't wasted and you draw from your own power at night, not PLN.

Your home's baseline

Electricity use

29.4 kWhper day

(~883 kWh per month)

Based on a Rp 1,500,000/month bill at the R-1 3500 sampai 5500 VA tariff (Rp 1,699.53 per kWh, PLN April 2026), your home uses about 29.4 kWh per day. That's the baseline we use for everything else.

Primary goal: energy control

Covers 70% of your usage

70%grid-free

  • Panels cover about 70% of your daytime electricity use
  • Home usage is 50% daytime, 50% nighttime
  • Real savings ~70% of the bill, with the battery capturing daytime surplus so nothing is wasted
  • "Save while staying semi-independent" mode: PLN rate hikes only affect your remaining usage, not the total
  • Good fit if your priority is lowering the bill while staying covered during blackouts via battery

System configuration

What you'll install on your roof

Panel production

20.7 kWhper day

(~621 kWh per month, assuming 4.5 peak sun hours)

  • Solar panels

    4.6 kWp

    ~8 modules at 580 Wp

  • Inverter

    3.6 kW

    Hybrid-ready

  • Battery

    10.2 kWh

    2 LiFePO4 modules

  • Panels: Jinko Tiger Neo 580W N-type, 8 modules x 580 Wp = 4.6 kWp datasheet rating (~25 m² of roof area)
  • Estimate uses datasheet rating; real-world output varies with temperature, soiling, and installation quality
  • Inverter: Deye Deye 3,6kW 5kW Hybrid | 3600W , 5000W | Low Voltage Battery 3.6 kW Hybrid-ready, sized to MAX of (PLN rating 3500 VA) or (panel 4.6 kWp divided by max DC:AC ratio 1.3)
  • Actual DC:AC ratio = 1.3 (healthy range 1.1 to 1.5)
  • Battery: HinaESS Hi-5 (2 modules x 5.1 kWh = 10.2 kWh nominal LiFePO4)
  • Sized for 50% nighttime usage (100% coverage assumes clear weather with 4.5 peak sun hours, no oversizing)
  • The more nighttime-dominant your use, the bigger the battery (panels only produce by day; at night you time-shift from the battery)

Equipment cost (excludes VAT and labor)

Estimated equipment cost

Rp 67,950,000

Excludes 11% VAT (Rp 7,474,500). Excludes balance of system (mounting, cabling, protection), installation labor, and commissioning.

Payback: about 6 years at your current bill

The number above is for the main equipment only (panels + inverter + battery). Balance of system, installation labor, and transport vary by location (roof condition, panel-to-meter distance, remote-site access), so they're discussed during the site survey. Reach out on WhatsApp below to get a full estimate for your home.

Solar panels
8 modules x 580 Wp = 4.6 kWp
Rp 16,100,000
Inverter
Deye 3.6 kW Hybrid
Rp 18,450,000
Battery
2 modules x 5.1 kWh = 10.2 kWh LiFePO4
Rp 33,400,000
Equipment subtotal
Before VAT, balance of system, and installation labor
Rp 67,950,000

Note: balance of system and installation labor depend on roof condition, panel-to-meter distance, site access (Java-Bali / Sumatra / eastern Indonesia), and PLN SLO certification. Typical balance-of-system range: Rp 3 million per kWp plus Rp 10 million fixed for protection. Typical installation labor: Rp 2 million per kWp. The exact number is set during the site survey.

Remaining PLN dependency

Your PLN bill after solar

Before

Rp 1,500,000

100% PLN

After

Rp 450,000

rest from PLN

  • Your PLN bill drops to Rp 450,000 per month
  • Panels cover 70%, the battery captures daytime surplus to use at night
  • When PLN rates rise next year, your bill goes up only on the remaining usage, not the total
  • If full grid independence is the goal, push coverage to 100% (panels just match daily use plus a nighttime battery, no oversizing)

25-year projection

PLN rates rise. Your bill doesn't have to.

This chart shows total cumulative electricity cost over 25 years. Red line: PLN-only, where annual cost compounds and rates climb 5% per year. Amber line: with solar, starting from the equipment investment of Rp 75.4 million in year zero (excluding balance of system and installation labor), then rising slowly from any remaining PLN draw. The crossover point (year 2031) is where the amber line drops below the red. Hover the dots every 2 years for per-year and per-month detail.

Total cumulative without solarTotal cumulative with solar (starts at upfront Rp 75.4 million)

After year 2031 (the payback point), every additional year is net savings vs. the PLN-only path. Total cumulative difference at year 2050: Rp 482.4 million net of the upfront investment.

Assumptions: PLN rates rise 5% compound, panels degrade 0.5% per year. Coverage at or above 100% has a battery sized to absorb degradation, so the residual stays at 0. Below 100%, the residual PLN cost rises gradually with drift. The upfront investment includes 11% VAT.

Fast response. Free. Consultant, not salesperson. If your home isn't a fit, we'll tell you.

Conservative estimate based on Indonesia's average irradiance and PLN tariffs as of April 2026. Real numbers depend on the specific brands picked, roof orientation, shading, and your local PLN conditions. For precise sizing, chat on WhatsApp. Independence is gradual, not all-or-nothing: we'll recommend sizing that fits, not the biggest system.

How we calculate

Engine assumptions plus technical terms. Open any card for details.

PLN tariff rises 5% per year (compound).
Anticipating subsidy reform plus carbon-pricing pressure. The 2020 to 2025 average for the 1300 to 5500 VA non-subsidized tier was 3.5 to 4% per year; 5% is a forward-looking conservative for 25-year planning.
Irradiance based on your home's location.
Pick your city under "Home location" for a more accurate per-region calculation. Indonesia is equatorial, so every region is solar-viable; output ranges from Excellent (Sumatra, Kalimantan, West Java) to Outstanding (East Java, Bali, NTT, Sulawesi, NTB). The default with no city picked is the Java baseline. Peak Sun Hours (PSH) = equivalent hours of full radiation per day. The math uses the panel datasheet rating; real-world output varies with temperature, soiling, mounting, and installation quality.
580 Wp tier-1 Grade-A modules (Jinko, Trina, LONGi).
Default panel spec. N-type 144-cell, 25-year warranty. Equivalent brands are fine as long as they are Bloomberg Tier-1 with warranty support in Indonesia. Module count = ceil(panel_kwp x 1000 / 580).
Inverter sized to PLN connection plus 15% buffer.
Not to panel kWp. The inverter has to serve the home's max load (= installed VA), regardless of panel size. The 15% buffer covers transient surges plus headroom for degradation. The DC:AC ratio (panel kWp / inverter kW) can run 1.1 to 1.5; midday clipping is small (under 3% per year).
Panels degrade 0.5% per year.
Tier-1 Bloomberg panels lose ~10 to 12% output over 25 years. Linear approximation. Coverage at or above 100% absorbs the degradation via panel and battery headroom (chart: the with-solar line stays flat). Below 100%, residual PLN cost rises gradually with drift.
The coverage % you pick is your independence target, not a fixed residual.
The engine does not assume a 10% residual. You pick 25/50/75/100/150/200%. At 100% or above you are free of PLN on normal days, with the battery handling cloudy stretches. Below 100%, part of usage still draws from PLN, the rest from solar.
Investment uses Q2 2026 retail plus 11% VAT.
Tier-1 panels Rp 5.5 million/kWp + hybrid inverter Rp 3 million/kW + LFP battery Rp 5 million/kWh + balance of system Rp 1.8 million/kWp + labor Rp 5 million flat + Java/Bali transport Rp 0. Source: market triangulation Q2 2026, refreshed quarterly. The exact number depends on the specific brands picked, mounting, and the actual roof orientation.
kWp (kilowatt-peak)
Maximum panel capacity at standard test conditions. A 2.5 kWp system = 2,500 watts peak output.
Payback period
Years until total savings equal the install capex. After payback, panels produce free electricity for the rest of the system life (~25 years).
Yield (specific yield)
AC kWh produced per kWp of panels per day (after inverter, cabling, and soiling losses). Indonesia averages 3.0 to 3.7 depending on location and roof orientation. The engine uses a Java baseline of 3.1.
Grid-tied vs hybrid
Grid-tied: panels connected to PLN, no nighttime backup, no operation during PLN outages. Hybrid: grid-tied plus battery backup, runs through PLN trips. Juragan Listrik always recommends hybrid (you pick the coverage %); pure grid-tied is not something we sell.

Assumption Glossary term

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