{"id":6011,"date":"2026-11-11T11:49:24","date_gmt":"2026-11-11T10:49:24","guid":{"rendered":"https:\/\/www.electrex.it\/en\/?p=6011"},"modified":"2026-11-11T11:56:39","modified_gmt":"2026-11-11T10:56:39","slug":"installed-solar-panels-check-your-reactive-energy-before-the-bill-does-it-for-you","status":"publish","type":"post","link":"https:\/\/www.electrex.it\/en\/news\/installed-solar-panels-check-your-reactive-energy-before-the-bill-does-it-for-you.html","title":{"rendered":"Installed solar panels? Check your reactive energy before the bill does it for you ⚡"},"content":{"rendered":"
\"Electrex<\/a><\/span><\/div><\/div>

…<\/span><\/p>\n

\u00a0 \u00a0A plant installs photovoltaics. The bill drops, as planned. A few months later, a new line appears: reactive energy charges.<\/strong><\/p>\n

Nothing is broken. It\u2019s just arithmetic.<\/p>\n

☀️ PV reduces the active<\/em> energy you buy from the grid (the energy that does the actual work).<\/p>\n

⚙️ But your motors and other inductive loads (transformers, welders, furnaces…) still need the same reactive<\/em> energy: the energy that magnetizes them but does no useful work.<\/p>\n

📐 The grid allows reactive energy up to one third of active energy. Beyond that, you pay.<\/p>\n

A simplified example:<\/strong><\/h2>\n

Before PV: you draw 300 units of active and 100 of reactive. That\u2019s right at the limit, so no penalty.
\nAfter PV covers 40% of your load: you draw 180 of active, still 100 of reactive. Reactive is now over half of active, so you cross the limit and the penalty appears.<\/p>\n

Same machines, same behavior. Only the solar plant changed.<\/p>\n

Why reactive energy is a cost, even when the penalty looks small<\/strong><\/h2>\n

The line on the bill is only the receipt, not the real cost:<\/p>\n

🔥 Reactive current still flows through cables, breakers and the transformer, and losses grow with the square<\/em> of the current.<\/p>\n

🔧 Hotter cables and stressed machines age faster.<\/p>\n

🏗️ Transformer capacity is sized in kVA, so reactive energy occupies headroom you\u2019ve already paid for. You find out when you want to add a production line or expand the PV plant.<\/p>\n

Where it goes wrong after a PV installation<\/strong><\/h2>\n

The power factor correction was sized before the PV plant, and nobody recalculated it. Or the CT of the correction controller sits downstream<\/em> of the inverter connection point, so it no longer sees what is exchanged with the grid. The result: too few capacitor steps, or too many, and reactive energy flowing into<\/em> the grid, which is also charged.<\/p>\n

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Without monitoring, you discover this in the invoice, one quarter later.<\/strong><\/p>\n<\/blockquote>\n

With monitoring, you see it in days.\"\"<\/a><\/strong><\/h2>\n

This is where an Electrex energy monitoring system<\/a> makes the difference:<\/p>\n

📊 Active and reactive energy and power factor are measured<\/a> at the connection point and on the main loads, so the balance is visible before the bill arrives.<\/p>\n

🕒 Interval data lets you compare behavior before and after the PV commissioning.<\/p>\n

🚨 Built-in relays and alarm thresholds flag when the power factor drifts, for example if a capacitor step stops working.<\/p>\n

🔌 Multiple communication ports (Modbus RTU\/TCP, Ethernet) feed the same data to your SCADA, EMS or cloud platform, with no walled gardens.<\/p>\n

🧩 Process and environmental data in the same system help you correlate the power factor with machine behavior.<\/p>\n

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Commissioning a PV plant should include re-checking the power factor correction. Monitoring makes that check continuous instead of a one-off.<\/strong><\/p>\n<\/blockquote>\n

Is your power factor correction still the one you had before the PV plant?
\n<\/em><\/p>\n

📩 Want to see how Electrex monitoring is deployed through our certified partners? Book a call with me (form here below).<\/em><\/p>\n<\/div>

Contact me to schedule a call! I will be glad to answer any questions you may have.<\/span><\/h3>\n<\/div>
\"Skender<\/a><\/div><\/div>
Skender Musaj<\/span>Export Manager<\/span><\/div>
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