
Sephu plant will serve as an addition to the 180 kW grid-connected ground-mounted solar photovoltaic power station in Rubesa (near ), which became operational in October 2021. The Sephu plant is currently under construction over an area of 65 acres in Yongtru village, situated in the . Upon its completion, the overall installed capacity of the facility will reach 22.38 megawatts and is expected to be complete by March 2025. It was initially planned. [pdf]
Households could be powered for a year by the solar plant at Rubesa, given the average household in Bhutan uses 1,567 kWh of electricity per year The pilot project, a 180-kilowatt solar photovoltaic (PV) plant was built at Rubesa village, in the western district of Wangduephodrang.
"Solar plant such as this can augment hydropower supply to meet our rapidly increasing domestic electricity demand, especially in winter months," he said. Electricity in Bhutan is mostly generated from hydropower, a renewable energy source, unlike fossil-fuel driven power plants that are major contributors to carbon dioxide emissions worldwide.
The project was executed by the Bhutanese government’s Department of Renewable Energy in collaboration with the Bhutan Power Corporation, a public utility. It received funding support from the Japanese government and was supported by the United Nations Development Programme in Bhutan. Is this the start of a solar energy rollout in Bhutan?
The pilot solar plant at Rubesa, Wangduephodrang, revealed a need for skilled workers and expertise in Bhutan (Image: Bhutan Power Corporation) An additional problem is that the current low cost of power means people are not incentivised to explore solar energy, according to Adhikari.
In Bhutan, the majority of the population live in rural areas, where energy is subsidised. Even those in cities are charged around BTN 3 (about USD 0.04) per unit (kilowatt-hour). To encourage local people and business to adopt solar power, the Bhutan Electricity Authority is looking to draft ‘Feed-In Tariff’ regulations.
Phuntsho Namgyal said that the solar plant in Rubesa is part of the country’s plan to diversify its energy sources and enhance energy security. In 2019, the International Renewable Energy Agency carried out a Renewable Readiness Assessment of Bhutan.

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For a 200Ah battery, an 800W solar panel is generally recommended to account for potential inefficiencies and ensure consistent charging. Here’s a brief breakdown:. For a 200Ah battery, an 800W solar panel is generally recommended to account for potential inefficiencies and ensure consistent charging. Here’s a brief breakdown:. To charge a 200Ah battery, use four 120W solar panels in a 12V system. For a 24V system, you will need two 200W panels. Charging time depends on sunlight and panel efficiency. [pdf]
Result: You need about 500 watt solar panel to charge a 12v 200ah lithium battery in 6 peak sun hours using an MPPT charge controller. What Size Solar Panel To Charge 200ah Battery? Here are some charts on what size solar panel you need to charge 12v and 24v 200ah lead acid or lithium (LiFePO4) battery.
You need about 600 watt solar panel to charge a 12v 200ah lithium battery from 100% depth of discharge in 5 peak sun hours. You need about 650 watt solar panel to charge a 24v 200ah lead acid battery from 50% depth of discharge in 5 peak sun hours. Related: What Size Solar Panel To Charge 24v Battery?
For a 200Ah lithium battery, this means the charge time could increase significantly compared to a sunny day. The exact time would depend on the intensity of the cloud cover and the efficiency of the panel. On heavily overcast days, the solar panel might produce only 10-25% of its rated capacity.
Now, let's shift our focus to the centerpiece of many renewable setups: the 200Ah lithium battery. This powerhouse, with its high energy density, is favored for its longevity and efficiency. Its capacity, denoted as 200Ah, signifies it can deliver 200 amperes in one hour. But, how does this relate to the solar panel you choose?
For our 200Ah battery example, if your region receives an average of 5 sunlight hours daily, you'd need a solar panel with a wattage of 480W (2400 Wh ÷ 5 hours). In essence, this simple calculation demystifies the process, providing newcomers with a clear roadmap to optimizing their solar setups.
The maximum charging current for a 200Ah lithium battery is usually 100A and the ideal charging current for a lead-acid or AGM battery is 50A. Charging your battery at a higher rate than what is recommended will decrease the battery charge efficiency rate. Use our battery charge and discharge rate calculator to find out.
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