Learn how to design a solar system that powers your AC and freezer efficiently. Get expert tips on sizing panels, batteries, inverters, and charge controllers for reliable, uninterrupted energy.

Stop Guessing! Here’s How to Calculate Your Solar System Needs Accurately

ByGLOBALNET ICT

Tired of Guessing Your Solar Needs? You’re Not Alone.

If you’ve ever asked a solar installer “How many panels do I need?” and got the answer “Maybe two or three should do,” — you’ve just witnessed one of the biggest reasons solar systems fail.

Here’s the truth:
Solar power is not guesswork. It’s science — and it starts with accurate solar sizing.

Guessing your solar system needs is like buying clothes without checking your size — it might look fine at first, but soon, you’ll realize it doesn’t fit.

In this guide, you’ll learn how to calculate your solar system needs the right way, step-by-step — and discover an easier way to do it using the Globisun Solar App.

Accurate Solar Sizing
Accurate Solar Sizing

Why Accurate Solar Sizing Matters

Every home or business consumes electricity differently. The more accurately you calculate your load requirements, the better your system will perform.

Without proper sizing:

  • Your batteries die early because they’re overworked.
  • Your inverter keeps tripping due to overload.
  • Your solar panels don’t generate enough power to sustain your daily use.

And in the end, you spend more money trying to “fix” what wasn’t sized properly in the first place.

So, let’s fix that — for good.

Step 1: List All Your Electrical Appliances

Grab a sheet of paper (or your phone) and list every device you plan to power with solar — from your TV to your fridge.
Then, note the power rating (in watts) and hours used per day.

Example:

AppliancePower (W)Hours/DayEnergy (Wh)
Fan708560
TV1005500
Bulbs (x5)156450
Laptop606360
Total Load1,870 Wh/day

Your total energy consumption per day is 1,870 watt-hours (Wh) — or 1.87 kWh.

Step 2: Factor in System Efficiency

No solar system runs at 100% efficiency. Between inverter losses, battery inefficiency, and cloudy weather, you should always add a 25% safety margin.

So:
1,870 Wh × 1.25 = 2,337 Wh/day

This means your system should comfortably produce around 2.3 kWh daily to meet your needs.

Step 3: Calculate Your Solar Panel Capacity

If you live in Nigeria or most parts of Africa, you typically get about 5 peak sun hours per day.

Solar panel capacity (W) = Total energy (Wh) ÷ Sun hours

2,337 Wh ÷ 5 = 467.4 W

That’s roughly two 250W panels — but remember, that’s the minimum. For reliability, aim for at least 3 panels (750W) to ensure steady charging even on cloudy days.

👉 Or better yet, skip the math and use the Globisun Solar App to instantly calculate your solar needs.

Step 4: Determine Battery Size

Your battery storage should hold enough power for night use and cloudy days.

Use this simple rule:
Battery capacity (Ah) = Total load (Wh) ÷ System voltage (V) ÷ Depth of discharge

For example:
2,337 Wh ÷ 12V ÷ 0.8 = 243 Ah

So, you’ll need about two 12V/200Ah batteries for reliable storage.

Step 5: Choose the Right Inverter and Charge Controller

  • Inverter size: Should be at least 25% higher than your peak load.
    If your maximum load is 800W, use a 1kVA inverter or more.
  • Charge controller size:
    Controller (A)=Panel power (W)÷System voltage (V)\text{Controller (A)} = \text{Panel power (W)} ÷ \text{System voltage (V)}Controller (A)=Panel power (W)÷System voltage (V)
    e.g., 750÷12=62.5A750 ÷ 12 = 62.5A750÷12=62.5A.
    So, a 60A MPPT controller works perfectly.

These numbers ensure smooth performance — no overloads, no battery damage, and no inverter burnouts.

Step 6: Simplify Everything with the Globisun App

Let’s be honest — doing manual calculations every time can be stressful.
That’s why the Globisun Solar App was created.

With it, you can:
✅ Calculate your solar needs instantly
✅ Get recommended inverter, battery, and panel sizes
✅ See how weather conditions affect your output
✅ Decode inverter error codes and learn how to fix them

No more trial and error — just smart, data-driven solar planning.

👉 Try it now and design your perfect solar system in minutes.

Final Thoughts — Solar Sizing Made Simple

If your solar system isn’t performing well, chances are it was sized wrongly.
Stop guessing, stop wasting money, and start using the right tools.

With accurate solar system design, you’ll enjoy:

  • Longer battery life
  • More stable power
  • Fewer inverter issues
  • Peace of mind

The best part? You don’t need to be an engineer to get it right.

👉 Download the Globisun Solar App today and take the guesswork out of solar sizing.

Your perfect solar system starts with one tap.

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