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Off Grid Street Light


The OGL1 is a revolutionary Off Grid street light by integrating solar and wind power in one compact housing. The OGL1 is intended to bring light and thus safety to parking lots, bus stops and all other public places where power lines are not available.

The unique way of integrating solar panels and a wind generator enables the OGL1 to provide light all year round, even in areas where the sun cannot be depended on. Furthermore the OGL1 is equipped with a unique and very advanced controller that regulates the light intensity depending on time-of-day, movements, battery state and even weather forecasts.

Technical features


To achieve maximum efficiency of the total system all components are customised or specifically designed for the OGL1. For maximum durability and lowest operational costs only top quality materials and parts are used, produced in the EU.

Battery

The heart of the system is a 300 Ah 2V Sonnenschein gel battery. This extremely durable battery provides one of the lowest operational costs currently on the market. Though 3 times the price of normal deep-cycle batteries, the Sonnenschein batteries prove to last up to 10 times as long (3.500 50% cycles).



Solar

The OGL1 is equiped with 2 3V 18 Watt solar panels. The unique layout of these panels is optimised for Northern European winter conditions



Wind

The Savonius type windgenerator is designed for city conditions. The normally erratic winds between buildings and trees render standard windgenerators useless but enable this drum type generator to produce an average 3W, 24 hours a day. Aerodynamic breaks protect the drum from destroying itself during strong gusts.



Light

The OGL1 is equiped with 12 1W LED's, producing a maximum of 1680 lumen. Each LED is controlled individually by the OGL1, enabling directional and general dimming of the light



Intelligence

The controller of the OGL1 is designed in-house to provide all necessary functions with the lowest possible power consumption. These functions include highly advanced battery management, detection of movement and weather forecasting. All this information is used to determine the optimal light intensity at any given moment.



Performance



The performance can be expressed in the ability to produce light, and this depends on the amount of energy available. Energy is calculated in Wh (Watt hour). This is the amount of energy it takes to burn 1 (1W) LED for 1 hour. When all 12 LED's are turned on for 12 hours this uses 12x12 is 144 Wh.



Production of energy

The average energy production for solar panels is expressed in Wh/Wp, or the amount of energy a 1 Watt solar panel produces over a certain amount of time. Off course this depends on the location and the time of year. For Holland this is, for a full year, approximately 900 Wh. However, the variation over the year is large: 20 Wh for december, 120 Wh for june. As the street light must also function in december, we use the lowest number.

Data on average wind speeds are not available for local conditions. The windgenerator is designed to produce 3W on average.

Total production = 96 Wh per day (24 from sun, 72 from wind)



Lighting performance

Although 96 Wh is produced per day, not all is available for lighting. First 10% is deducted due to losses in the battery which leaves 86 Wh. The controller uses 12 Wh, leaving 74 Wh for lighting

This enables for a 12 hour period, for example:
2 hours at 100%
2 hours at 50%
8 hours at 33%



Battery performance

The battery capacity is 300Ah at 2V, totalling 600Wh. To ensure maximum battery life using more than 50% of the capacity should be avoided, leaving 300Wh for normal operation (the 10% loss is at charging the battery). With a normal usage of 96Wh per day this enables 3 days of normal operational autonomy (i.e. no power is generated at all).

After 50% of the battery is depleted the OGL1 switches to emergency use. In this mode the controller functions are limited reducing the controllers energy usage to less than 5Wh a day. Lighting functionality is reduced on a downsloping scale, stretching battery-only lighting functionality to more than 2 weeks.

With only 10% of the battery capacity left the OGL1 switches off completely. The controller now performs only minor tasks to enable monitoring of the re-charging process of the battery.