🔋 Kalkulator Penentuan Baterai
Tentukan ukuran baterai LiFePO4 untuk cadangan atau peak-shaving: kapasitas yang diperlukan dari beban dan otonomi, konfigurasi seri/paralel, umur siklus berbasis DoD, dan PCS yang sesuai, dengan daftar material.
🔋 Load & Autonomy
📊 Battery Design
Untuk perancang tenaga surya dan penyimpanan yang menentukan ukuran baterai dan sistem konversi daya.
Cara menghitungnya
· Kapasitas yang diperlukan: E = Beban (kW) × jam ÷ DoD ÷ efisiensi.
· Sel seri: seri = V_sistem ÷ 3.2 (sel LFP).
· Pemeriksaan C-rate: beban ÷ kapasitas ≤ 1.0 C direkomendasikan.
Standar yang dirujuk
| Standard | Scope |
|---|---|
| IEC 61427 | Sel sekunder untuk penyimpanan energi terbarukan |
| IEC 62619 | Keamanan sel dan baterai litium sekunder |
Contoh perhitungan — 10 kW selama 4 jam → 46.8 kWh
1. Beban 10 kW, cadangan 4 jam, DoD 90%, efisiensi 95%.
2. Kebutuhan = 10 × 4 ÷ 0.90 ÷ 0.95 = 46.8 kWh.
3. Sistem 51.2 V → 16 sel seri; konfigurasi klaster terdekat dipilih.
4. C-rate = 10 ÷ 46.8 = 0.21 C (dalam 0.5–1.0 C); PCS yang sesuai dipilih.
FAQ
How do I size a battery from load and autonomy?
Battery energy = daily load kWh x autonomy days / depth of discharge / round-trip efficiency. For 20 kWh/day load, 1 day autonomy, 80% DoD and 90% efficiency: 20 / 0.8 / 0.9 = 27.8 kWh, so select a 30 kWh bank. The calculator computes capacity and matches standard rack/cabinet sizes.
What is depth of discharge and why does it matter?
Depth of discharge is the fraction of capacity used per cycle. LFP batteries tolerate 80-90% DoD for 6,000+ cycles; lead-acid lasts longest at 50% DoD. Deeper discharge shortens cycle life, so the battery is oversized to respect the DoD limit. The calculator applies DoD to the usable-capacity calculation.
How long does a battery last in cycle life?
LFP cells deliver 6,000-8,000 cycles at 80% DoD (roughly 15-20 years at one cycle/day), while NMC gives 3,000-5,000 and lead-acid 500-1,200. Calendar life and temperature also matter — operating above 35 deg C accelerates degradation. The calculator reports cycle-life implications for the sized bank.
How do I match a PCS to the battery?
The PCS power rating must cover the peak load and charge rate, and its DC voltage range must match the battery string. For a 30 kWh bank serving a 10 kW peak load, select a 10-15 kW PCS. The calculator matches PCS power and battery DC voltage to the sized bank.
What battery capacity do I need for peak-shaving?
For peak-shaving, the battery must cover the peak demand above the target for the duration of the peak window, usually 2-4 hours. Shaving 100 kW for 3 hours needs 300 kWh usable, or ~375 kWh at 80% DoD. The calculator sizes the bank for the shaving window and quantifies demand-charge savings.
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