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| Photovoltaic street lamp |
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Self-powered street lamp with photovoltaic system
• Economical
• Easy to install
• Non-polluting, conforms to Kyoto protocolo
• Easily transported for temporary and emergency lighting
• No electricity bills (Enel)
Advantages
The photovoltaic solar lighting system has several important features::
• It does not require mains electricity supply:
every pole is independent and is no way connected to the others;
• Energy is generated exclusively from sunlight:
it is stored during the day and supplied at night;
• No operator action is required:
once programmed, the electronic control unit turns the system On and Off independently;
• The system is highly reliable:
since it is totally built with solid state components;.
System dimensions
The lamp comes on during the night every day of the year; the dimensions of the photovoltaic system were designed in relation to the December/January period, when sunlight is minimal and statistically equivalent to about 2.7 hours/day on average (in reality, on cloudless days, sunlight totals least 6 hours).
In these conditions, the accumulator will have a daily charge (average statistics) of about 350 Wh (equal to the effective power delivered by the modules, multiplied by 2.7 hours/day of sunlight on the surface of the modules, in turn equal to the daily average in the period of least sunshine).
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| Specifications |
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Electricity generation can be assured by a monocrystalline photovoltaic panel having maximum rated power of 175 Wp. Every lamp is controlled by a control unit that manages accumulator recharging and automatic activation of the lamp, that comes on a dusk and switches off after a preset time using a programmable timer.
The lamp, panel and control unit are mounted on a hot galvanised, tapered steel pole 7 metres high. The accumulation system comprises a semi-stationary battery with flat lead plates (12V/176 Ah, C100) ensuring low maintenance requirements.
The battery is housed in a below-ground pit supplied as standard complete with a cover; this solution means that the battery is exposed to smaller thermal excursions and, in particular, is protected against low winter night temperatures that would otherwise cause a significant loss in effective capacity and consequently in the operative autonomy of the lamp.
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| Characteristics - SOX-E26 lamp |
| TSupply voltage | 58 Veff. |
| Voltage change allowed | +/- 5% |
| Lamp power | 31 W |
| Lamp current | 0.53 Aeff. |
| Connection | BY22D |
| Light flow | 4000 Lumen |
| Lighting efficiency | 129 Lumen/watt |
| Colour temperature | 1800 °K |
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| Characteristics - standard photovoltaic lamp |
| Pole in galvanised steel | h=7,1 m |
| Support structure for photovoltaic modules | adjustable on two axis |
| Photovoltaic modules | 1x175 Wp |
| Control unit with night-light and timer | 12 v, 15 a, ip67 |
| Ceiling light with sodium vapour lamp | 36 w - sox36e |
| Battery with positive tubular plates | 12v, 157 ah |
| Plastic battery housing | IP 50 |
| Time "ON" (*) | 8 |
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| Operation outline |
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Various lamp versions are available to satisfy effective requirements in all installation conditions, even the most specific.
The number of "ON" hours required and the power of the lamp are the factors that determine the area of the photovoltaic modules used: for this reason, Unimetal offers photovoltaic lamps with modules equipped with a solar tracking device.
This approach in many cases helps increase the otherwise limited number of "ON" hours or reduce the area of the photovoltaic modules installed on top of the lamp.
In any case, it is also possible to adapt the product to different requirements than those covered
by standard production.
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