What is a photovoltaic power plant or PV system?

Posted in: Energy efficiency, Solar energy

Diagram of PV system

It is a system that converts solar energy into electricity.
Such systems are best suited for farmers, beekeepers, cafes, hotels and other small businesses which do not have access to the grid or when electric supply quality is poor.

What is included in a PV system?
The full kit usually consists of photovoltaic panels, solar charge controller, batteries, inverter, connecting cables and connectors.

How does PV system function?
Solar panels, due to inherent electrical properties, produce direct electric current. It can be used directly in many simple devices powered by batteries (eg, laptops, DVD players, chargers, lamps, etc.).

Where AC power is needed, inverter is added to the system to convert direct current to alternating current with a voltage of 220 V and a modified or pure sine wave output. Inverter nornmally has built in protection against short circuit, overload, overheating, etc. Inverter is connected to a DC power supply – the battery and AC load is connected to inverter. Thus, the inverter consumes a constant current of 12 V solar cell and battery or 24V and outputs an alternating current voltage of 220 V and 50 Hz.

Battery accumulates and stores generated by photo-modules electricity for its further use at needed time, especially for the provision of energy during evenings and nights.

Charge controller regulates battery charging and prevents fatal battery deep discharge and overcharge, prolonging its life.

How much does PV system cost?
Depending on whether you need DC or AC current, whether you want to want to have a 1-day or a standard 3-day reserve of energy in the battery, the system cost can vary greatly.

For example, PV system with capacity of 0.6 kW and 1-day reserve of energy in the batteries has cost the farmer from Kara-Balta about 3 thousand dollars, including purchase of additional materials, delivery and installation.

PV station for rural medical stations, with 3 kW installed capacity, with a 3-day energy reserved in gel batteries cost about 28 thousand dollars, including the purchase of additional materials, delivery and installation.

Thus, you need to plan for the amount of 5 to 10 thousand dollars per 1 kW of power.

What is the right installed capacity of PV system for me?
System capacity will depend on your daily power consumption in kWh. The easiest way it can be estimated is by dividing your electricity bill in kWh by 30.

For example, the average monthly household consumption is 180 – 300 kWh per month, or 6 – 10 kWh per day.
PV system of 1 kW installed capacity will produce from 5 to 9 kWh of electricity, depending on weather and time of the year. So if our household will implement simple energy saving tips, 1 kWsized system might be sufficient for providing energy supply.

You want to aquire energy independence? Call 0312 533763, 0555755306, or write to talve@yandex.ru

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