<form method="POST" action="api/save_inverter_stage1.php">

<input type="hidden" name="barcode" value="<?= $barcode ?>">

<label>Battery Barcode</label>
<input type="text" name="battery_barcode" required>

<label>BMS Serial Number</label>
<input type="text" name="bms_serial" required>

<label>Battery Capacity</label>
<input type="text" name="battery_capacity" required>

<label>Battery Voltage</label>
<input type="text" name="battery_voltage" required>

<label>Operator</label>
<input type="text" name="operator_name" required>

<button type="submit">
Save Stage 1
</button>

</form>