Khenad Technologies

02/08/2026

⚡𝟮-𝗣𝗢𝗟𝗘 𝗕𝗥𝗘𝗔𝗞𝗘𝗥 𝘃𝘀 𝟭-𝗣𝗢𝗟𝗘 𝗕𝗥𝗘𝗔𝗞𝗘𝗥: 𝗪𝗵𝗶𝗰𝗵 𝗦𝗵𝗼𝘂𝗹𝗱 𝗬𝗼𝘂 𝗨𝘀𝗲 𝗕𝗲𝘁𝘄𝗲𝗲𝗻 𝘁𝗵𝗲 𝗚𝗿𝗶𝗱 𝗮𝗻𝗱 𝗬𝗼𝘂𝗿 𝗜𝗻𝘃𝗲𝗿𝘁𝗲𝗿?

This is one of the most overlooked aspects of many solar installations, yet it has a direct impact on safety, maintenance, and system protection.

From the diagram attached, you'll notice two different methods of connecting the AC grid input to an inverter.

✅ Option 1: Using a 2-Pole (2P) Breaker

A 2-pole breaker disconnects both the Live (L) and Neutral (N) conductors whenever the breaker is switched OFF or trips.

Why is this important?
✔️ Provides complete isolation of the inverter from the utility grid.
✔️ Makes maintenance safer since both conductors are disconnected.
✔️ Reduces the possibility of unwanted voltage appearing through the neutral conductor.
✔️ Commonly recommended by inverter manufacturers and electrical installation standards for single-phase systems.

⚠️ Option 2: Using a Single-Pole (1P) Breaker

A single-pole breaker disconnects only the Live (L) conductor while the Neutral remains permanently connected.

Although this method can still be found in some installations, it has limitations.

The inverter is not completely isolated from the grid.
Neutral remains connected even when the breaker is OFF.
Maintenance requires extra caution because part of the circuit is still connected.

This doesn't automatically mean the 𝐢𝐧𝐬𝐭𝐚𝐥𝐥𝐚𝐭𝐢𝐨𝐧 𝐢𝐬 𝐮𝐧𝐬𝐚𝐟𝐞, but it depends on the inverter design, local electrical regulations, and the earthing arrangement.

📌 Which one is recommended?

For most residential solar installations, I recommend using a 2-Pole AC breaker on the grid input of the inverter unless the inverter manufacturer specifically states otherwise.

The additional cost is relatively small compared to the improved safety and ease of maintenance.

Remember:

''𝘈 𝘣𝘳𝘦𝘢𝘬𝘦𝘳 𝘪𝘴𝘯'𝘵 𝘰𝘯𝘭𝘺 𝘧𝘰𝘳 𝘰𝘷𝘦𝘳𝘤𝘶𝘳𝘳𝘦𝘯𝘵 𝘱𝘳𝘰𝘵𝘦𝘤𝘵𝘪𝘰𝘯 -- 𝘪𝘵 𝘴𝘩𝘰𝘶𝘭𝘥 𝘢𝘭𝘴𝘰 𝘱𝘳𝘰𝘷𝘪𝘥𝘦 𝘴𝘢𝘧𝘦 𝘪𝘴𝘰𝘭𝘢𝘵𝘪𝘰𝘯 𝘸𝘩𝘦𝘯𝘦𝘷𝘦𝘳 𝘮𝘢𝘪𝘯𝘵𝘦𝘯𝘢𝘯𝘤𝘦 𝘪𝘴 𝘳𝘦𝘲𝘶𝘪𝘳𝘦𝘥.''

💬 Have you seen installations where only a 1P breaker was used on the AC input?

Share your experience in the comments. Let's learn from one another.

01/08/2026

31/07/2026

Surge on the load side or line side ? Let's hear your view

09/07/2026

If going solar is your dream but a complete system isn't within your budget yet, don't let that stop you.

Start with what you can afford today. You can always upgrade your solar system as your needs grow and your budget improves. Solar is a journey, not an all-or-nothing investment.

That's why I'm introducing this powerful 1000W Solar Generator—an affordable way to begin your solar journey without breaking the bank.

Perfect for powering your:
✅ Smart TV
✅ Laptop
✅ Standing fan
✅ Lights
✅ Wi-Fi router
✅ Phone charging
…and other small household appliances, as long as the total load does not exceed 800W.

Don't wait until you can afford a large solar system before enjoying uninterrupted power.

Start small today and upgrade tomorrow.

📩 Send me a message to learn more or place your order.

28/06/2026

Ever Wonder What All These Numbers on a Solar Inverter Mean? 🤔

Most people walk past this label without looking at it, but this small sticker tells the entire story of what your inverter can and cannot do.

Let's break it down in simple English. 👇

🔹 Model Name (HYP4850S100-H)
Think of this as the inverter's "full name." It's the exact model installers use when selecting compatible batteries and solar panels.

🔹 Operating Temperature (-10°C to 55°C)
This is the weather range where the inverter can work safely. Too hot or too cold, and performance may reduce.

🔹 IP20 Rating
The inverter is protected from fingers and large objects but not from water. That's why it says "Indoor Product Only."

🔹 Rated Power (5000VA / 5000W)
This means the inverter can continuously power appliances totaling 5,000 watts. Running more than this may overload it.

🔹 Output Voltage (230V)
This is the same electricity voltage used in most Nigerian homes, making it suitable for everyday appliances.

🔹 Rated Current (21.7A) ⚡

This is the maximum continuous current the inverter can supply at its rated output power (5,000W) and output voltage (230V).

🔹 Battery Voltage (48V)
This inverter is designed for a 48V battery system. A 12V or 24V battery won't work with it.

🔹 Battery Voltage Range (40–60V)
As the battery charges and discharges, its voltage changes. As long as it's between 40V and 60V, the inverter is happy.

🔹 AC Input (170–280V)
This is the acceptable NEPA/Generator voltage. If the voltage falls outside this range, the inverter may reject it to protect your appliances.

🔹 Maximum AC Bypass Current (40A) 🔌

This tells you the maximum amount of electricity from NEPA or a generator that can pass directly through the inverter to your appliances when it's in bypass mode.

🔹 Maximum AC Charging Current (60A)
When charging from NEPA or a generator, the inverter can charge the battery at up to 60 Amps.

🔹 Maximum Solar Power (5500W) ☀️
You can connect up to 5.5kW of solar panels to this inverter.

🔹 Maximum PV Voltage (500V) ⚡
This is the highest solar panel voltage the inverter can safely handle. Exceeding it can permanently damage the inverter.

🔹 MPPT Range (120–450V)
This is the inverter's "sweet spot" where it harvests the maximum possible energy from your solar panels.

🔹 Maximum PV Input Current (22A)
The total current coming from the solar panels should not exceed 22 Amps.

🔹 Maximum Solar Charging Current (100A) 🔋
The inverter can charge the battery from solar at up to 100 Amps, allowing faster charging when enough sunlight is available.

💡 The Takeaway

A solar inverter isn't just about the brand or the price. Understanding the label helps you know its limits, choose the right solar panels and batteries, and avoid costly installation mistakes.

📌 Next time you see an inverter label, don't ignore it -- it's the inverter's CV.

💬 Have you ever looked at an inverter label and wondered what all those numbers meant? Drop your questions in the comments, and I'll explain them in simple terms.

25/06/2026

How to Correctly Calculate the Size of a Solar Inverter

One of the most common mistakes in solar system design is selecting an inverter based only on battery size or assuming bigger always means better. In reality, inverter sizing starts with understanding your actual electrical load. A correctly sized inverter improves efficiency, reduces unnecessary investment costs, and protects system performance.

The first step is to calculate your total running load by listing appliances expected to operate at the same time. For example:

• Television = 120W
• 5 LED bulbs = 50W
• Refrigerator = 200W

Total running load = 370W

The second step is accounting for surge power. Appliances with motors such as refrigerators, compressors, and fans require higher starting current for a few seconds during startup. A refrigerator rated at 200W may briefly demand 300W to 400W during compressor start up.

Next, apply a safety margin of approximately 20% to 30% to allow operational flexibility and future expansion.

370W × 1.25 = 462.5W

Most inverter manufacturers rate systems in VA or kVA rather than watts. To estimate inverter capacity:

VA = Watts ÷ Power Factor

Assuming a power factor of 0.7:

462.5 ÷ 0.7 = 661VA

This means the practical recommendation becomes a 700VA inverter or the next available standard size.

Remember that inverter sizing should not only match today’s appliances. Consider future loads, surge requirements, battery charging rates, and solar expansion plans. Good solar systems are not oversized or undersized. They are correctly engineered.

10/06/2026

10/06/2026

UNDERSTANDING PHOTOVOLTAIC (PV) SYSTEMS

Any electrical system that uses photovoltaic (solar) modules to convert sunlight into electricity is known as a Photovoltaic (PV) System. However, not all PV systems are designed the same way. Depending on how they interact with batteries and the utility grid, PV systems can be classified into different categories.

In this series, we'll explore the major types of PV systems, how they work, their advantages, limitations, and where they are best applied.

1️⃣ Standalone (Off-Grid) PV Systems

These systems operate independently of the utility grid and are commonly used in areas with little or no access to public electricity.

A. Without Storage

i. Solar panels supply power directly to the load.
ii. No batteries are used.
iii. Power is only available when sufficient sunlight is present.

B. With Storage

i. Includes batteries to store excess solar energy.
ii. Power can be used during the night or on cloudy days.
iii. Common in residential and remote installations.

C. Hybrid Systems

i. Combines solar PV, batteries, and an additional energy source such as a generator or the utility grid.
ii. Provides greater reliability and energy security.

2️⃣ Grid-Connected PV Systems

These systems are connected to the utility grid and can exchange power with it.

A. Direct Grid Connection

i. Solar power is supplied directly to the grid.
ii. Usually does not require batteries.
iii. Common in large commercial and utility-scale solar plants.

B. Grid Connection via Household Loads

i. Solar energy first powers household or business loads.
ii. Excess energy may be exported to the grid.
iii. Grid power supplements solar generation when needed.

C. Grid-Connected with Storage

i. Combines solar PV, batteries, and the utility grid.
ii. Provides backup power during outages while maximizing solar energy utilization.
iii. Becoming increasingly popular in modern residential and commercial installations.

In the coming posts, we will examine each of these systems in detail, including their components, operating principles, design considerations, and real-world applications.

Follow this page and stay tuned as we simplify Solar PV Engineering--- one concept at a time.

09/06/2026

Welcome to Khenad Technologies!

We are passionate about delivering reliable and sustainable solar energy solutions. This page will feature:

✅ Solar PV system designs

✅ Installation projects

✅ Energy-saving tips

✅ Solar engineering tutorials

✅ Renewable energy insights

Whether you're a homeowner, business owner, student, or fellow solar professional, you'll find practical and valuable content here.

Follow our page and join us as we explore the future of clean energy, one project at a time.