diff --git a/Abrechnung/module.php b/Abrechnung/module.php
index c9b7701..a553ec2 100644
--- a/Abrechnung/module.php
+++ b/Abrechnung/module.php
@@ -248,75 +248,87 @@ private function AddMeterToPDFRow($meter, $tariffs, $from, $to, $type)
 
     IPS_LogMessage('Abrechnung', "Meter {$meter['name']} ($type) von " . date('d.m.Y H:i', $from) . " bis " . date('d.m.Y H:i', $to) . ": start=$startValTotal, end=$endValTotal");
 
-    if ($startValTotal === null || $endValTotal === null) return ['row' => '', 'value' => 0];
+    if ($startValTotal === null || $endValTotal === null) {
+        return ['row' => '', 'value' => 0];
+    }
 
     $totalDiff = max(0, $endValTotal - $startValTotal);
-    if ($totalDiff <= 0) return ['row' => '', 'value' => 0];
+    if ($totalDiff <= 0) {
+        return ['row' => '', 'value' => 0];
+    }
 
     $rows = '';
     $totalCost = 0.0;
-    $foundTariff = false;
 
-    foreach ($tariffs as $t) {
-        // Einheit auflösen (ignoriere Groß/Kleinschreibung, evtl. Synonyme)
-        $unitType = strtolower($t['unit_type']);
-        $meterType = strtolower($type);
-        if ($meterType === 'strombezug') $meterType = 'strom';
-        if ($meterType === 'warmwasser') $meterType = 'wasser';
-        if ($unitType !== $meterType) continue;
+    // Filtere Tarife nur für den relevanten Typ (z. B. Strom / Wasser)
+    $tariffs = array_filter($tariffs, function($t) use ($type) {
+        return strtolower($t['unit_type']) == strtolower($type);
+    });
 
-        $tariffStart = strtotime($t['start']);
-        $tariffEnd   = strtotime($t['end']);
+    // Sortiere Tarife chronologisch
+    usort($tariffs, function($a, $b) {
+        return strtotime($a['start']) <=> strtotime($b['start']);
+    });
 
-        // Überschneidung
-        $sectionStart = max($from, $tariffStart);
-        $sectionEnd   = min($to, $tariffEnd);
-        if ($sectionEnd <= $sectionStart) continue;
+    $currentStart = $from;
+    $currentStartVal = $startValTotal;
 
-        $sectionFraction = ($sectionEnd - $sectionStart) / ($to - $from);
-        $sectionDiff = $totalDiff * $sectionFraction;
+    while ($currentStart < $to) {
+        // passenden Tarif zum aktuellen Zeitpunkt finden
+        $activeTariff = null;
+        foreach ($tariffs as $t) {
+            $tariffStart = strtotime($t['start']);
+            $tariffEnd   = strtotime($t['end']);
+            if ($currentStart >= $tariffStart && $currentStart < $tariffEnd) {
+                $activeTariff = $t;
+                break;
+            }
+        }
 
-        $sectionStartVal = $startValTotal + $totalDiff * (($sectionStart - $from) / ($to - $from));
-        $sectionEndVal   = $sectionStartVal + $sectionDiff;
+        if ($activeTariff === null) {
+            // kein Tarif gefunden – nehme Nulltarif bis zum nächsten bekannten Start oder Ende
+            $nextTariffStart = $to;
+            foreach ($tariffs as $t) {
+                $ts = strtotime($t['start']);
+                if ($ts > $currentStart && $ts < $nextTariffStart) {
+                    $nextTariffStart = $ts;
+                }
+            }
+            $segmentEnd = min($nextTariffStart, $to);
+            $segmentTariff = 0.0;
+        } else {
+            $segmentEnd = min(strtotime($activeTariff['end']), $to);
+            $segmentTariff = floatval($activeTariff['price']);
+        }
 
-        $tariffRp = floatval($t['price']); // Preis in Rappen pro Einheit
-        $costCHF  = ($tariffRp / 100) * $sectionDiff;
+        // Verbrauchsanteil über Zeitverhältnis
+        $segmentFraction = ($segmentEnd - $currentStart) / ($to - $from);
+        $segmentDiff = $totalDiff * $segmentFraction;
+
+        $segmentStartVal = $currentStartVal;
+        $segmentEndVal   = $segmentStartVal + $segmentDiff;
+
+        $segmentCostCHF = ($segmentTariff / 100) * $segmentDiff;
 
         $rows .= "
         <tr>
             <td>{$meter['name']}</td>
             <td>$type</td>
-            <td>" . date('d.m.Y H:i', $sectionStart) . "</td>
-            <td>" . date('d.m.Y H:i', $sectionEnd) . "</td>
-            <td>" . number_format($sectionStartVal, 2) . "</td>
-            <td>" . number_format($sectionEndVal, 2) . "</td>
-            <td>" . number_format($sectionDiff, 2) . "</td>
-            <td>" . number_format($tariffRp, 2) . "</td>
-            <td>" . number_format($costCHF, 2) . "</td>
+            <td>" . date('d.m.Y H:i', $currentStart) . "</td>
+            <td>" . date('d.m.Y H:i', $segmentEnd) . "</td>
+            <td>" . number_format($segmentStartVal, 2) . "</td>
+            <td>" . number_format($segmentEndVal, 2) . "</td>
+            <td>" . number_format($segmentDiff, 2) . "</td>
+            <td>" . number_format($segmentTariff, 2) . "</td>
+            <td>" . number_format($segmentCostCHF, 2) . "</td>
         </tr>";
 
-        $totalCost += $costCHF;
-        $foundTariff = true;
-    }
-
-    // Falls kein passender Tarif gefunden
-    if (!$foundTariff) {
-        $rows .= "
-        <tr>
-            <td>{$meter['name']}</td>
-            <td>$type</td>
-            <td>" . date('d.m.Y H:i', $from) . "</td>
-            <td>" . date('d.m.Y H:i', $to) . "</td>
-            <td>" . number_format($startValTotal, 2) . "</td>
-            <td>" . number_format($endValTotal, 2) . "</td>
-            <td>" . number_format($totalDiff, 2) . "</td>
-            <td>0</td>
-            <td>0.00</td>
-        </tr>";
+        $totalCost += $segmentCostCHF;
+        $currentStart = $segmentEnd;
+        $currentStartVal = $segmentEndVal;
     }
 
     return ['row' => $rows, 'value' => $totalCost];
 }
 
-
 }
\ No newline at end of file