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Stern.
Shaping the Future
of Green Energy

Structural Design

In streetlight design, there is a need to practice limit states structural design; known material failure stresses are compared to the calculated stress of a combination of loads, that include dead loads (weight), wind loads and snow loads.

Design parameters are assigned by the National Building Code on a regional basis based on the historical evidence of that region. Our pole design allows for up to 2250W of solar panel power nominal rating to be attached to the stem section.

The current state of the art solar lamp pole suppliers can only provide up to 360W of solar panel power nominal rating attached to the top of the pole. The 625% increase of nominal solar power generation capability yields an immense performance advantage over existing technologies and allows the Stern Solar Power Pole to be used in higher power applications such as continuous video surveillance, large area illumination, and for the powering of remote wireless communications equipment.

Curved Flexible Vertical Solar Panels

Arranged in arc segments, curved vertical solar panels provide stationary tracking of the suns rays to allow for optimal power point operation of the solar charge controller as the sun follows its natural arc.

Field testing using identical panels in an actual installed system configuration has demonstrated that two curved vertical solar panel segments produce 4.5% more energy than two flat vertical solar panels under the same solar conditions.

The existing state of the art outdoor solar lamp poles all use flat solar panels that do not track the sun & natural arc. 

LiFePO4 Batteries

LiFePO4 batteries allow for cold temperature (below 0 deg C) operation of outdoor solar lamps. The existing state of the art uses non-heated AGM or LiFePO4 batteries to store solar energy and supply power to the lamps. Non-heated LiFePO4 cannot charge at temperatures below 0 deg C without incurring damage.

AGM batteries are rated for 800 cycles at 50% depth of discharge and typically need to be replaced after 4.5 years. LiFePO4 batteries are rated for 5000 cycles at 80% depth of discharge and have a theoretical expected service life of over 20 years. By using Stern Power Systems heated LiFePo4 batteries, full charging and discharging operation can be realized down to -40 deg C using only 28% of the battery energy capacity per day. 

What makes us different

Why Stern Solar?

Solar Energy Capture

The Stern pole allows for up to 2250W of solar panel power nominal rating. Wind loading and bending moments prohibit competitive solutions from providing solar panel power nominal ratings higher than 360W.

The 625% increase of nominal solar power generation capability in the Stern solution yields an immense performance advantage over existing technologies and allows it to be used in higher power applications such as continuous video surveillance, large area illumination, and for the powering of remote wireless communications equipment.

Long Life Cold Temperature Operation

Heated LiFePO4 batteries allow below 0 deg C operation of outdoor solar lamps. Competitors uses non-heated AGM or LiFePO4 batteries to store solar energy and supply power. Non-heated LiFePO4 cannot charge at temperatures below 0 deg C without incurring damage.

AGM batteries are rated for 800 cycles at 50% DOD and need replacement after 4.5 years. LiFePO4 batteries are rated for 5000 cycles at 80% DOD and have a theoretical expected service life of over 20 years.

Stern Power Systems heated LiFePo4 batteries allow full charge/discharge operation down to -40 deg C using only 28% of the battery energy capacity per day.

Stationary Solar tracking for improved Energy Capture

Arranged in arc segments, Stern’s curved vertical solar panels provide stationary tracking of the sun to allow optimal power point operation as the sun follows its natural arc. This optimizes solar energy capture during all seasons, especially winter. Competitive solutions with fixed south facing flat panel designs cannot efficiently capture sunlight during morning and late afternoon-evening solar trajectories.

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