Understanding a stand alone system: frequently asked questions

What are the main parameters which determine the technical requirements of a stand-alone photovoltaic system?

 The following factors are essential:

  •  The place of installation,
  •  The daily consumption forecast,
  •  The required voltage: 12 v or 24 V DC( or 230 V in case of a/c power).

 How to calculate its daily consumption?

To calculate your consumption, multiply the total power (Watts) of the devices requireing power by the greatest number of hours per day they are to be used. For example: you use 2 x 8-watt bulbs for 3 hours per day. The calculation is therefore 2 x 8 W x 3 hours/day = 48 Wh*/day. The surface of the panels, the capacity of the batteries and the total amount invested are proportional to this consumption.

(* Watt hours shown as Wh)

 The component parts of a system and what is the role each plays. 

 The power generator

High-efficiency polycrystalline photovoltaic panels generate the power; more panels, more power. All panels are protected on the front by tempered glass plate. An all-luminium frame surrounds the panel/s and provides mechanical stability.

 Batteries

Batteries are essential for storing the power during daylight hours and for delivering it as and when required. We use longlife, deep cell 12V or 24V batteries developed especially solar applications of batteries and which require no maintenance.

 The regulator

The regulator controls the charging and discharging of power to and from the battery. This helps prevent overcharging and undercharging and significantly increase its service life of the battery.

The inverter

The inverter converts direct current to alternative current (a/c).

 Lights

The use of high-tech, low power consuming LED lighting is always the preffered option.

 Wiring

Appropriate quality wiring is essential both for efficient power delivery and for safety reasons which include the risk of fire. The minimum requirements are generally 2.5 mm² both between the solar panels and the regulator and also between the regulator and the equipment itself.

 Do you have standard kits for autonomous systems?

We have five different kits of 50 Wc, 70 Wc, 95 Wc, 135 Wc or 210 Wc. Of course we offer a much wider range based on your exact needs.

 What is the average daily production of astandard Panel from its situation?

As an example, the following information focuses on a facility that is directed towards the South and receives no shade from trees or other buildings.

In Belgium, the ideal angle of inclination is 60 °, i.e. the angle that maximizes the capacity of the system in winter. In fact, most are close to the equator, less this bank angle is high.

Therefore, a 95 Wc Panel will produce to Kedougou (Senegal) about 284 Wh/day in winter. This corresponds to the consumption of 8 13 watt bulbs lit for 2 h 45. In Belgium, a 135 Wc Panel will produce only about 73 Wh/day on December/January. For a stand-alone installation, the most critical period of the year is winter. That is why, in a system design, it is its winter production capacity which is most important.

 What is the average cost of such a facility?

The total budget is proportional to required consumption. A complete technical appraisal of your proposed system is critical to obtaining the optimal quality/price ratio. The good choice of materials also determine the lifetime of your installation. All these elements are essential factors in a delivering a quality installation.

We will always provide you with full technical and financial estimates upon request.

Please contact us to obtain a preliminary budget.

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