Introduction

Your inverter fan is meant to turn ON only when:
✔ the inverter is hot
✔ charging at high current
✔ load increases

If the fan runs constantly (all day or nonstop), something is wrong.

Constant fan operation is a sign of:
❌ overheating
❌ overload
❌ weak batteries
❌ internal damage
❌ poor ventilation

Ignoring this warning can lead to inverter burnout, battery damage, or complete failure.

In this guide, Solarzone Nigeria explains the real reasons your inverter fan keeps running — and what to do about it.

⭐ 1️⃣ Overheating (Most Common Cause)

When your inverter gets too hot, the fan must stay ON to prevent damage.

❌ Causes:

• inverter installed in hot room

• no ventilation

• dusty vents

• heavy daytime load

• inverter near generator or heat source

✔ Solutions:

• move inverter to cooler area

• create ventilation openings

• clean vents regularly

• reduce load during peak heat

If not controlled, overheating can destroy MOSFETs and capacitors.

⭐ 2️⃣ Weak or Drained Batteries

Weak batteries force the inverter to work harder, generating more heat.

❌ Signs:

• inverter fan runs nonstop

• inverter becomes hot

• battery drains fast

• inverter trips under small load

✔ Fix:

• test battery

• replace weak/old batteries

• upgrade to lithium

Healthy batteries = cooler inverter.

⭐ 3️⃣ Heavy Load or Overloading

Running too many appliances:
✔ fridge
✔ freezer
✔ AC
✔ pumping machine
✔ microwave

increases inverter workload → fan stays ON to cool components.

✔ Fix:

• reduce load

• avoid running multiple heavy appliances together

• upgrade inverter size

Overload = heat + constant fan noise.

⭐ 4️⃣ Dust Blocking Airflow

During harmattan and dry season, dust enters:

• vents

• fan blades

• heat sinks

This prevents proper cooling.

❌ Results:

• fan runs more often

• inverter heats faster

• reduced performance

✔ Fix:

• clean vents

• clean fan housing

• wipe surrounding area

Solarzone performs internal dust cleaning safely.

⭐ 5️⃣ Faulty or Overworked MPPT/Charge Controller

If MPPT is:

• too small

• faulty

• overheating

it transfers heat to the inverter indirectly.

✔ Fix:

• test MPPT

• upgrade to higher rating

• replace faulty MPPT

A faulty MPPT makes the inverter work harder during charging.

⭐ 6️⃣ Poor Installation Location

If inverter is installed in:
❌ wardrobe
❌ kitchen
❌ cramped cabinet
❌ enclosed wooden box

it cannot release heat.

✔ Fix:

• relocate inverter

• ensure 2–3 feet free space around it

• avoid direct sunlight exposure

Cooling space = longer lifespan.

⭐ 7️⃣ Faulty Internal Cooling Sensor

Some inverters have temperature sensors that activate the fan.

A faulty sensor may:

• constantly read high temperature

• keep fan ON

• cause wrong warnings

✔ Fix:

Sensor replacement by Solarzone’s technicians.

⭐ 8️⃣ Wrong Cable Size or Loose Terminals

Thin or loose battery cables cause:
❌ high resistance
❌ voltage drop
❌ excessive heat inside inverter

✔ Fix:

• use recommended 16mm or 25mm cables

• tighten all terminals

• replace burnt or small wires

Bad wiring = more heat = more fan activity.

⭐ 9️⃣ Internal Component Fault

If MOSFETs, transformers, or capacitors fail:

• inverter gets hot quickly

• fan stays on continuously

• inverter may shut down eventually

✔ Fix:

Internal repair by Solarzone engineers.

⭐ 🔟 Harmattan & Dry Season Heat Surge

High weather temperature causes:

• faster inverter heating

• longer fan operation

• reduced cooling efficiency

✔ Fix:

• improve ventilation

• reduce daytime load

• keep inverter area dust-free

⭐ When to Call Solarzone

Call Solarzone immediately if:
✔ inverter fan runs all day
✔ inverter feels hot to touch
✔ fan is noisy or shaking
✔ inverter trips during load
✔ inverter fan doesn’t stop at night
✔ fan noise gets louder
✔ inverter shows temperature warning

We offer:
⭐ inverter troubleshooting
⭐ fan replacement
⭐ full maintenance & cleaning
⭐ inverter relocation
⭐ wiring correction
⭐ battery upgrade
⭐ MPPT testing
⭐ component repair

🏁 Final Thoughts

Your inverter fan runs constantly because of:
✔ overheating
✔ overload
✔ weak batteries
✔ bad wiring
✔ dusty vents
✔ faulty internal components
✔ poor installation location

A constantly running fan is a warning sign — fix it early to avoid expensive inverter damage.

Let Solarzone Nigeria diagnose and repair your inverter properly.

💥 Call to Action

⚡ Is your inverter fan running constantly? Let Solarzone fix it today.
📞 Call/WhatsApp: 09091394722