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SolarCalcKit
SOLARCALCKIT SUITE / バッテリーバンク配線とトポロジー

バッテリーバンク配線とトポロジー

IEEE 485 & NEC 706 REFERENCE METHODOLOGY

目標容量を正確な直列/並列配線に変換 — ストリング数・バッテリー本数はすべて整数、端子配線図をリアルタイム表示し計算根拠も透明です。

Bank Specification
Client-Side Engine
01 Individual Unit Specs

Nominal voltage of one battery.

Nominal capacity of one battery, in Ah.

02 System DC Bus

DC voltage the bank must reach. Battery voltage must divide it evenly.

03 Target Bank Size

Energy is what loads consume; capacity is what specs quote.

Desired nominal bank energy, in kWh.

Battery bank sizing, from target to wiring

A battery bank is two decisions made physical: how many batteries in series it takes to reach your system voltage, and how many identical series strings in parallel it takes to reach your target capacity. This battery bank calculator makes both decisions for you, reports the resulting bank voltage, Ah, and kWh, and draws the exact wiring — including which terminal of each battery connects to which.

It applies no chemistry assumptions and no safety factors — the configuration you see is the configuration you would build. If you instead want to size a solar bank from daily energy use and autonomy (with depth of discharge and inverter efficiency), use the Solar Battery Calculator.

Formulas

The bank sizing math

Straightforward arithmetic with two constraints: whole batteries only, and battery voltage must divide system voltage.

Step 1 — Batteries in series

series = system voltage ÷ battery voltage

Wiring batteries in series increases voltage while keeping capacity (Ah) the same: four 12 V 100 Ah batteries in series give 48 V at 100 Ah.

Step 2 — Parallel strings

strings = ⌈target Ah ÷ battery Ah⌉

Wiring identical series strings in parallel increases capacity. Always rounded up so the bank never falls short of the target.

よくある質問

直列・並列のストリング数はどう計算しますか?

システム電圧を1本のバッテリー電圧で割ると直列1ストリングの本数、必要アンペア時を1本のアンペア時で割って切り上げると並列ストリング数になります。計算ツールは両方のステップを行い、余剰容量も表示します。

異なる容量や種類のバッテリーを1つのバンクに混ぜられますか?

できません。バンク内のバッテリーは電圧・容量・種類・使用年数・充電状態が同一である必要があります。混在すると充電の不均衡・劣化の加速・安全上の危険を招きます。

直列・並列接続で容量は増えますか?

どちらも1本あたりの蓄電量は変わりません。直列はアンペア時一定のまま電圧を倍増、並列は電圧一定のままアンペア時を倍増させます。ワット時のエネルギーはいずれも本数に比例して増えます。

Related Calculators

Continue your system design with the other tools in the SolarCalcKit suite — in the order the rest of your design flows: load audit → battery → bank wiring → MPPT → wire size → inverter.