To increase the efficiency of your DC/DC Converter, you will choice the very big value of the Inductance and the capacity.

Dear Hasan Rakib

Switching at a higher frequency allows for the use of smaller inductors and capacitors, which reduces size, cost, and weight, but at the cost of efficiency. Switching at lower frequencies requires larger inductors and capacitors, but will improve efficiency.

Kind Regards

Qamar Ul Islam

Dear Hasan:

At the first, and as you know:

The power density of a dc-to-dc converter is generally limited by bulky magnetic components, especially in applications where the input and output voltages are relatively high. Inductor/transformer size can be reduced by increasing the switching frequency, but this reduces converter efficiency because of switching-related losses. It is better to eliminate the magnetics altogether with an inductorless switched capacitor converter (charge pump) topology. Charge pumps can increase power density as much as 10× over a conventional converter without sacrificing efficiency. Instead of an inductor, a flying capacitor stores and transfers the energy from input to output. Despite the advantages of charge pump designs, switched capacitor converters are traditionally limited to low power applications, due to the challenges presented in startup, protection, gate drive, and regulation.

The LTC7820 is a fixed ratio, high voltage, high power switched capacitor controller that yields small and cost-effective solutions for high power, nonisolated intermediate bus applications with fault protection.

For more information about this state you could benefit from this Link:

https://www.analog.com/en/design-notes/high-efficiency-high-density-switched-capacitor-converter-for-high-power-applications.html.

In addition to the above, I want to add the following:

Solar panel efficiency is a measure of the amount of sunlight (irradiation) that falls on the surface of a solar panel and is converted into electricity. Due to the many advances in photovoltaic technology over recent years, the average panel conversion efficiency has increased from 15% to well over 20%. This large jump in efficiency resulted in the power rating of a standard size panel to increase from 250W up to 370W.

As explained in detail below, solar panel efficiency is determined by two main factors; the photovoltaic (PV) cell efficiency, based on the cell design and silicon type, and the total panel efficiency, based on the cell layout, configuration and panel size.

Cell efficiency is determined by the cell structure and base silicon material used which is generally either P-type or N-type. Cell efficiency is calculated by what is known as the fill factor (FF), which is the maximum conversion efficiency of a PV cell at the optimum operating voltage and current.

The cell design plays a significant role in panel efficiency. Key features include silicon type, multiple busbars (MBB), and passivation type (PERC). The high-cost IBC cells are currently the most efficient (20-22%), due to the high purity N-type silicon cell base and no losses from busbar/finger shading. However, recent mono PERC cells with MBB and the latest heterojunction (HJT) cells have achieved efficiency levels well above 20%.

Total Panel efficiency is measured under standard test conditions (STC), based on a cell temperature of 25°C, solar irradiance of 1000W/m2 and Air Mass of 1.5. The efficiency (%) of a panel is calculated by the maximum power rating (W) at STC, divided by the total panel area in meters.

Efficiency(%) = (Pmax×100)/(Area×1000W/m^2)

Overall panel efficiency can be influenced by many factors including; temperature, irradiance level, cell type, and interconnection of the cells. Surprisingly, even the colour of the protective backsheet can affect efficiency. A black backsheet might look more aesthetically pleasing, but it absorbs more heat resulting in higher cell temperature which increases resistance, this in turn slightly reduces total conversion efficiency.

Panels built using advanced ‘Interdigitated back contact’ or IBC cells are the most efficient, followed by heterojunction (HJT) cells, half-cut and multi-busbar monocrystalline PERC cells, shingled cells and finally 60-cell (4-5 busbar) mono cells. 60 cell poly or multicrystalline panels are generally the least efficient and equally the lowest cost panels.

The power rating of a solar panel, measured in Watts (W), is calculated under standard test conditions (STC) and measured at a cell temperature of 25°C. However, in real-world use, cell temperature generally rises well above 25°C, depending on the ambient air temperature, wind speed, time of day and amount of solar irradiance (solar energy - W/m2). During sunny weather, the internal cell temperature is often 20-30°C higher than the ambient air temperature, which equates to approximately 8-12% reduction in total power output - depending on the type of solar cell and its temperature coefficient.

Conversely, extremely cold temperatures can result in an increase in power generation as the PV cell voltage increases at lower temperatures below STC. Solar panels can generate power above the nameplate power rating during very cold, sunny weather.

The Power Temperature Coefficient

Higher or lower cell temperature will either reduce or increase the power output by a specific amount for every degree above or below 25°C (STC). This is known as the power temperature coefficient which is measured in %/°C. Monocrystalline panels have an average temperature coefficient of -0.38% /°C, while polycrystalline panels are slightly higher at -0.40% /°C. Monocrystalline IBC cells have a much better (lower) temperature coefficient of around -0.30%/°C while the best performing cells at high temperatures are HJT (heterojunction) cells which are as low as -0.25% /°C.

Power temperature coefficient is measured in % per °C - Lower is more efficient

Polycrystalline cells - 0.39 to 0.43 % /°C

Monocrystalline cells - 0.35 to 0.40 % /°C

Monocrystalline IBC cells - 0.28 to 0.31% /°C

Monocrystalline HJT cells - 0.25 to 0.27 % /°C

Generally cell temperature is 20-30°C higher than the ambient air temperature which equates to approximately 8-12% reduction in power output. Note, cell temperature can rise as high as 80°C when mounted on a dark coloured rooftop during very hot 40+°C, windless days.

I hope it will be helpful...

With my best regards ..