first commit

src/domain/services/power-balance.service.ts

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+import {
+  calculateCurrentA,
+  calculateDemandPowerKw,
+  calculateInstalledPowerKw,
+} from "../calculations/power-calculation.js";
+import type { Consumer } from "../models/consumer.model.js";
+
+export interface ConsumerWithCalculatedValues extends Consumer {
+  installedPowerKw: number;
+  demandPowerKw: number;
+  currentA?: number;
+}
+
+export class PowerBalanceService {
+  enrichConsumer(consumer: Consumer): ConsumerWithCalculatedValues {
+    const installedPowerKw = calculateInstalledPowerKw({
+      quantity: consumer.quantity,
+      installedPowerPerUnitKw: consumer.installedPowerPerUnitKw,
+      demandFactor: consumer.demandFactor,
+    });
+    const demandPowerKw = calculateDemandPowerKw({
+      quantity: consumer.quantity,
+      installedPowerPerUnitKw: consumer.installedPowerPerUnitKw,
+      demandFactor: consumer.demandFactor,
+    });
+
+    let currentA: number | undefined;
+    if (consumer.voltageV && consumer.phaseCount && consumer.powerFactor) {
+      currentA = calculateCurrentA({
+        demandPowerKw,
+        voltageV: consumer.voltageV,
+        phaseCount: consumer.phaseCount,
+        powerFactor: consumer.powerFactor,
+      });
+    }
+
+    return {
+      ...consumer,
+      installedPowerKw,
+      demandPowerKw,
+      currentA,
+    };
+  }
+}
+