EV charging time formula
wall kWh = battery kWh x SOC change / charging efficiencyCharging time divides wall energy by charger power. Cost multiplies wall energy by electricity price.
家庭用エネルギー計画ツールキット
太陽光パネル、EV充電、バックアップバッテリー、発電機、省エネ改修をシンプルなオンライン計算機で計画しましょう。充電時間、ソーラー回収期間、稼働時間、発電機容量、ネットメータリング節約額、ヒートポンプコストなど。
計算機ディレクトリ
充電器・パネル・バッテリー・ポータブル電源を購入する前に、充電時間・システム規模・稼働時間・バックアップを比較しましょう。
計算式の注記
wall kWh = battery kWh x SOC change / charging efficiencyCharging time divides wall energy by charger power. Cost multiplies wall energy by electricity price.
runtime hours = capacity Wh x usable percent x inverter efficiency / load WStandby draw is included because small always-on loads matter during long outages.
solar kW = daily kWh / (peak sun hours x performance factor)Panel count rounds up from array watts divided by the selected solar panel wattage.
coverage days = usable battery kWh / max(0, daily load kWh - daily solar kWh)Solar production uses a conservative real-world performance factor for inverter and weather losses.
ユースケース
Compare Level 1, Level 2, and DC fast charging assumptions before buying an EV charger.
Estimate whether a portable power station can run a refrigerator, router, CPAP, or workstation.
Size a rooftop solar array and battery bank before requesting installer quotes.
Model blackout coverage before buying batteries, panels, inverters, or generator backup.
よくある質問
Most estimates only need values you can find on an EV, charger, solar panel, battery label, or electricity bill: capacity, power, load, price, peak sun hours, and efficiency.
Charging has conversion losses, and real vehicles often taper charging near high state of charge. This calculator models the main loss factor and is best for planning estimates.
It is useful for early sizing. Real output depends on roof angle, shade, weather, inverter clipping, utility rules, and local permitting.
Yes. The calculators are designed for early planning and comparison. Always check product manuals, installer recommendations, utility rules, and local electrical codes before purchasing or installing equipment.