ARC SOLAR

ARC SOLAR Arc Solar Uganda provides high-quality, sustainable solar energy solutions for homes, businesses, and communities.

Our reliable products, are designed for durability and value. Contact us at +256703316194 / +256784779414
visit www.arcsolarug.com Solar specializes in high quality solar products guaranteed to make your life better

Don’t Buy Solar. Buy the Right Solution.A lot of people approach solar by asking, “How much is a solar system?” But the ...
01/09/2026

Don’t Buy Solar. Buy the Right Solution.

A lot of people approach solar by asking, “How much is a solar system?” But the better question is, “What do I need the system to do?”

A home that only needs lights, WiFi and a TV during outages does not need the same system as a business running computers, refrigeration, pumps and other equipment. The right solar solution depends on your energy consumption, peak load, backup hours, battery capacity, available sunlight and future needs.

That is where ARC Solar Uganda comes in. We assess your energy requirements, recommend the appropriate solar panels, lithium batteries, inverters and protection equipment, and professionally install a system designed around your actual needs.

Don’t buy a bigger system just because it sounds better. Don’t buy a cheaper system just because it costs less. Buy a system that is correctly designed for you.

+256 784 779 414 | +256 703 316 194
arcsolarug.com

ARC Solar Uganda. Solar designed around your needs.

What Happens to a Hybrid Inverter When the Grid Electricity Is Unstable?A hybrid inverter continuously monitors the elec...
01/09/2026

What Happens to a Hybrid Inverter When the Grid Electricity Is Unstable?

A hybrid inverter continuously monitors the electricity coming from the utility grid, including voltage and frequency. If the grid moves outside the inverter’s acceptable operating range, it can automatically disconnect from the utility through its internal transfer switch or contactor. This protects the inverter and household equipment from abnormal grid conditions. Depending on the system configuration, the inverter can then supply the backed-up loads using available solar and battery power, effectively creating an independent power source for the home.

When the grid becomes unstable, the inverter does not necessarily disconnect at every small fluctuation. Its response depends on the magnitude and duration of the disturbance and the protection settings configured for that particular model. If the grid becomes acceptable again, the inverter normally waits for a specified period of stability before reconnecting. This prevents it from repeatedly connecting to a grid that is still unstable. Homeowners should therefore not bypass or unnecessarily widen these protection settings simply to prevent the inverter from disconnecting.

Repeated grid instability can, however, create problems. Constant switching between grid and battery can increase battery cycling, while repeated contactor operation can cause mechanical wear over time. Severe voltage spikes can also damage sensitive electronic equipment. This is why a properly installed system should include appropriately rated AC surge protection, DC surge protection, circuit protection, isolation equipment and proper earthing. The inverter should also be correctly sized for the household loads, particularly high-demand appliances such as air conditioners, water heaters, pumps and cookers.

Most importantly, homeowners should pay attention to repeated grid fault alarms or frequent switching between grid, solar and battery. This should not simply be accepted as normal operation. The cause could be poor utility supply, excessive voltage drop, undersized cables, loose connections, incorrect inverter settings or an installation fault. A properly designed hybrid system should safely manage the relationship between the grid, solar panels, battery and household loads, while providing reliable backup power when the utility supply becomes unavailable or unsafe.

How Good Are 12V 100Ah and 200Ah Lithium Batteries Compared With 5.12kWh Batteries?A 12V 100Ah lithium battery stores ap...
31/08/2026

How Good Are 12V 100Ah and 200Ah Lithium Batteries Compared With 5.12kWh Batteries?

A 12V 100Ah lithium battery stores approximately 1.28kWh, while a 12V 200Ah battery stores approximately 2.56kWh. A typical 51.2V 100Ah battery stores approximately 5.12kWh. Capacity is therefore only part of the comparison. If all three use quality Grade A LiFePO₄ cells, they can offer similar chemistry, efficiency and cycle life.

The major difference is system voltage. To obtain 5.12kWh using 12V 200Ah batteries, you would need two batteries in parallel for 5.12kWh at approximately 12.8V, or four 12V 100Ah batteries. For a 48V class system, multiple 12V batteries would also need to be connected in series. This introduces more cables, connections, BMS units and opportunities for imbalance.

Higher voltage has an important electrical advantage. For the same power, increasing voltage reduces current. A 5kW load at approximately 51.2V requires around 98A, before losses. At approximately 12.8V, the same load would require around 391A. That difference has major implications for cable size, voltage drop, protection and heat.

This does not make 12V lithium batteries inferior. They can be excellent for smaller applications. However, for larger residential and commercial solar systems, an integrated 48V or 51.2V battery can provide a cleaner and more efficient architecture. The right battery is determined by the load, inverter voltage, required storage capacity and system design, not simply the Ah rating.

A Solar System Should Not Just Power Your Home. It Should Give You Control.Power goes off, but your evening does not hav...
30/08/2026

A Solar System Should Not Just Power Your Home. It Should Give You Control.

Power goes off, but your evening does not have to stop. Your refrigerator keeps running. Your WiFi stays on. Security systems remain active. Your family can watch television, work, study and carry on with normal life.

That is the real value of a properly designed solar backup system. It is not simply about generating electricity. It is about having dependable power when you need it most.

At ARC Solar Uganda, we design and install solar systems for homes and businesses, combining quality solar panels, hybrid inverters and reliable battery storage to match your actual energy needs.

Power should be available when life demands it.

+256 703 316 194 | +256 784 779 414
arcsolarug.com

Now imagine the power suddenly goes off.The question is not whether you own electrical appliances. The question is how m...
29/08/2026

Now imagine the power suddenly goes off.

The question is not whether you own electrical appliances. The question is how many of the things you depend on can continue working when the grid is unavailable?

A properly designed solar backup system can keep your essential appliances running during outages, giving you comfort, connectivity, security and peace of mind without depending entirely on the grid.

At ARC Solar Uganda, we assess your actual energy needs and design the right combination of solar panels, lithium batteries and inverters for your home or business.

The best time to think about backup power is before you need it.

+256 784 779 414 | +256 703 316 194

Do Hybrid Transformerless Inverters Consume Power When There Is No Load?Yes. A hybrid transformerless inverter still con...
28/08/2026

Do Hybrid Transformerless Inverters Consume Power When There Is No Load?

Yes. A hybrid transformerless inverter still consumes a small amount of electricity even when no appliances are connected. This is known as idle or standby consumption. Depending on the inverter model, it can typically be around 30 to 60 W continuously. For example, a 40 W idle draw consumes approximately 0.96 kWh per day, or nearly 29 kWh per month, without powering a single appliance.

This happens because the inverter’s internal electronics continue operating. The control board, display, communication circuits, battery monitoring, MPPT electronics and other components need power, while the inverter also remains ready to supply AC power whenever a load is connected.

Is this bad for the system? Not necessarily. Idle consumption is a normal characteristic of an operating inverter and does not mean the inverter is faulty. However, in an off-grid system, continuous consumption can gradually discharge the battery, particularly during the night or several cloudy days. Repeated unnecessary battery discharge can also reduce available battery capacity and contribute to battery cycling over time.

The solution: If your inverter has Eco Mode, Sleep Mode or Load-Sensing Mode, enable it where appropriate. These features can reduce consumption when there is little or no load. If the solar system will not be used for an extended period, such as an unoccupied building, the inverter can be properly shut down according to the manufacturer’s instructions. Most importantly, check the inverter’s no-load consumption rating before purchasing and include this energy demand when sizing the solar panels and battery.

Between Copper and Aluminium Cables, Which Is Best for Your Solar System?Cable selection is one of the most overlooked p...
27/08/2026

Between Copper and Aluminium Cables, Which Is Best for Your Solar System?

Cable selection is one of the most overlooked parts of a solar installation. Copper and aluminium can both be used, but they have different electrical and physical characteristics. Copper has higher conductivity, meaning it can carry the same current using a smaller conductor, with lower resistance and generally lower voltage drop. It is also flexible and easier to terminate, making it particularly practical for smaller residential systems.

For small and medium solar systems, copper is often the preferred choice, especially for connections between solar panels, charge controllers, inverters and batteries. However, the cable must still be correctly sized. Current, cable length, allowable voltage drop, ambient temperature and installation method all influence the required conductor size. An undersized cable can cause excessive heating, energy losses and poor system performance.

The situation becomes more interesting with large lithium battery systems. These systems can deliver very high DC currents, making conductor sizing and voltage drop extremely important. Aluminium can be attractive for long, high current runs because it is lighter and generally less expensive than copper. However, because aluminium has higher electrical resistance, a larger conductor is normally required to carry the same current. Its connections also require proper aluminium rated terminals and careful installation to manage oxidation and thermal expansion.

So, which is best? There is no universal answer. Copper is usually more convenient for smaller systems, while properly designed aluminium conductors can be economical for large installations and long cable runs. What matters most is correct sizing, appropriate insulation, quality terminations and properly coordinated protection. In a well designed solar system, the cable is not an accessory. It is part of the safety, efficiency and reliability of the entire system.

What Is a Solar Panel String?A solar panel string is a group of panels connected in series, with the positive terminal o...
26/08/2026

What Is a Solar Panel String?

A solar panel string is a group of panels connected in series, with the positive terminal of one panel connected to the negative terminal of the next. In a series connection, the voltage adds up while the current remains approximately the same. For example, ten panels with a Vmp of 40V would produce approximately 400V at maximum power.

The number of panels you can put on one string is not fixed. It is determined mainly by the inverter’s maximum PV input voltage, its MPPT voltage range, the panel’s Voc and Vmp, and the temperature at the installation site. The most important safety calculation is ensuring that the combined Voc of the string, particularly at the lowest expected temperature, does not exceed the inverter’s maximum PV voltage. The string must also produce sufficient voltage to remain within the inverter’s MPPT operating range.

String design also requires checking the current limits of the inverter. Connecting panels in series increases voltage but does not increase current. Different strings can then be connected to separate MPPT inputs, which is especially useful where panels have different orientations or shading conditions. Poor string design can result in reduced production, MPPT problems or, in extreme cases, equipment damage.

During installation, panels are securely mounted and connected in series using suitable DC cables and connectors. The completed string is checked for polarity, Voc, connections and voltage before being connected to the inverter through the required DC protection and isolation equipment. Proper string sizing is therefore not about simply counting panels; it is about matching the panels, inverter and site conditions correctly.

ARC Solar Uganda | Professional Solar Design, Supply & Installation

4 Things Homeowners Should Know About Lithium Batteries1. Your lithium battery has a “brain”Most modern lithium batterie...
25/08/2026

4 Things Homeowners Should Know About Lithium Batteries

1. Your lithium battery has a “brain”

Most modern lithium batteries have a Battery Management System (BMS). It monitors voltage, current and temperature and helps protect the battery from overcharging, excessive discharge and overheating.

2. You don’t have to drain the battery to 0%

Lithium batteries can operate without being completely discharged. Avoiding unnecessary deep discharges can help preserve battery life and maintain good performance over time.

3. Heat matters

Lithium batteries perform best when installed in a suitable environment. Excessive heat can affect battery performance and contribute to faster ageing. Proper installation and ventilation are therefore important.

4. The cheapest lithium battery may not be the best value

Two batteries can have the same 5.12 kWh capacity but very different quality. The cells, BMS, cycle life, discharge capability and overall construction all matter.

When buying a lithium battery for your home, don’t look at the price and capacity alone.

Ask what is inside the battery, how it is protected and how it is expected to perform over its useful life.

At ARC Solar Uganda, we believe good solar starts with choosing the right battery for your home’s needs.

What Does kWh Mean on a Lithium Battery?When you see a lithium battery labelled 5.12kWh, 10kWh, or 15kWh, the kWh figure...
25/08/2026

What Does kWh Mean on a Lithium Battery?

When you see a lithium battery labelled 5.12kWh, 10kWh, or 15kWh, the kWh figure tells you how much electrical energy the battery can store. One kilowatt-hour equals 1,000 watt-hours. In simple terms, a 10kWh battery theoretically contains enough energy to deliver 1kW for 10 hours, 500W for 20 hours, or 2kW for 5 hours, before accounting for usable DoD, inverter losses, and other system factors.

It is important not to confuse kWh with kW. kWh measures energy capacity, while kW measures power. Think of the battery as a fuel tank and the inverter as the engine. A large 10kWh battery may store plenty of energy, but if the inverter is only rated at 3kW, you cannot continuously operate a 5kW load simply because the battery has enough stored energy. The battery determines how much energy is available, while the inverter and battery discharge rating determine how much power can be delivered at once.

Battery kWh can also be calculated from its voltage and amp-hour rating. The basic formula is kWh = Voltage × Ah ÷ 1,000. For example, a 51.2V, 100Ah LiFePO₄ battery has a nominal capacity of 51.2 × 100 ÷ 1,000 = 5.12kWh. This is one reason kWh is more useful than Ah when comparing batteries operating at different voltages. A 100Ah battery at 12.8V does not contain the same amount of energy as a 100Ah battery at 51.2V.

However, the rated kWh is not necessarily the energy your appliances will receive. Depth of Discharge, battery efficiency, inverter efficiency, temperature, battery age, and operating conditions affect usable energy. A 5.12kWh battery operated at 90% DoD provides approximately 4.61kWh before conversion losses. Understanding kWh therefore helps homeowners choose the right battery capacity, estimate backup time, and compare different storage systems based on actual energy rather than simply looking at voltage or amp-hours.

Address

Plot 6, Market Street, Nakasero
Kampala
00256

Opening Hours

Monday 09:00 - 19:00
Tuesday 09:00 - 19:00
Wednesday 07:00 - 17:00
Thursday 07:00 - 19:00
Friday 07:00 - 19:00
Saturday 07:00 - 19:00
Sunday 09:00 - 16:00

Telephone

+256784779414

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