Batteries at home
Design a zero-bill setup with solar, a battery, and an EV.
Local tariffs, local solar yield, and your household load. Find a setup for your home.
Select a country to price a setup for off-grid, a zero bill, maximum savings, or a point between those.
Daily energy flow
Configurator
Power usage at home
Configure your household and EV-charging energy consumption at home
Household load
Configure your household energy consumption during the day and night
EVs in Household
Add electric vehicles in your household and configure the charging behavior for each
System setup
Configure your solar and battery system
Full Off-Grid: Conservative system with 20% solar buffer and 2.5 days battery autonomy for maximum reliability
Zero-Bill: Optimized system that achieves zero monthly bill (may be smaller than off-grid)
Best Net Savings: Best 25-year net savings including system and EV costs
Custom: Manually configured system without optimization.
Live simulation
Financial overview
Monthly view
Monthly electricity bill comparison
25-Year View
Total cost over 25 years including electricity, EV charging, and system cost (3% annual inflation)
Setup cost
Initial system investment and expected payback period
Energy flow
Scenario Comparison
How much more value does a battery (and EV) add on top of solar?
Cost vs savings
CO₂ & self-sufficiency
20-year cost
Equipment plus the electricity still bought from the grid. Grid only is this house's bill with no solar, battery, or EV. The EV bar adds the car's home charging and a charger. Petrol is not included. Today's tariff, held flat for 20 years.
* Electricity tariff: TNB RP4 Domestic General ≤1500 kWh: 44.43 sen/kWh (27.03 + 4.55 + 12.85 sen). AFA (+3.67 sen/kWh in Sep 2026) is waived at ≤600 kWh; the Energy Efficiency Incentive is consumption-dependent and is not baked in. Last verified 21 September 2026.
*Real 2025 tariffs/yields. Assumes average household. Actual varies by roof/usage/weather. Updated monthly.*
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