Telecom Worksheet

Note: For applications not pertaining to telecommunications please use one of our other Worksheets

Polar provides generator and power systems that are configured to meet our customers’ needs by matching our various sub-systems and components against our customer’s specific program requirements. To create a complete and detailed “data sheet package” our customers review each of our options and then assemble the individual component / sub assembly data sheets into a binder. The information you provide will be kept confidential. It will not be released, published or shared with any third party. (* indicates required field)

Polar can provide a complete:
• DC generator in an open frame or weatherproof enclosure
• Power system including batteries, shelter, site monitoring controls, and solar photovoltaics

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Power profile

NOTE: Oversizing ANY generator (AC or DC) to meet future load will increase maintenance.

AC generators are sized based on peak loads, making them more susceptible to Wet Stacking.

DC generators are sized based on kilowatt hours (kWh) per day, when used in conjunction with a battery.

Generator profile

Please note that all of our generators are shipped with fully automatic controls with remote control and monitoring. Communication ports included are RS-232 and CAN bus.

Site equipment description

The Lithium-Ion batteries from Polar are cost competitive with lead acid battery chemistries. When sizing a battery bank for cycling load calculations are based on available amp hours during the discharge cycle. For example at 1000 amp hour lead acid provides only 150 to 250 amp hours available during the discharge cycle. A deeper discharge below 15% will adversely affects battery life and charging efficiencies. To provide a similar amount of amp hour capacity during discharge, the Li-Ion battery is sized at 200 to 250 hours. An Li-Ion batteries can be discharged 70% to 80% of its rating limited effect on service life. The cost of a 250 amp hour Li-Ion battery is similar in cost to amp hour lead acid battery. Comparing the cost of 1000 amp hour lead acid battery against 1000 amp hour Li-Ion battery is irrational.
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Application Notes

1. Selection of the alternator type, either 8000 or 6200. Our 8000 series is the popular choice for telecommunications and battery charging applications. The 6200 is used for specialized military applications requiring ultra fast voltage regulation and fixed engine speed operation. Details on the 8000 series alternator can be found here.

2. Selection of the generators power range on applications that incorporate cycle charging (using a combination of battery and generator to power the load) the selection of the generator’s power range (kW or Amps) is determined by:
Factoring the daily or weekly energy demand of the load (kWh or Ah) against the desired generator run time. For example a simple calculation: The load is 1.5 kW over a 24 hour period, the daily energy demand is 36 kWh. If you wanted to run the generator for 3 hours a day you would run the generator at 12 kW. This is a simple calculation as it assumes the battery is 100% efficient.
The battery bank size and technology will also affect the generator run time. If the battery bank is not able to charge at 12 kW per hour then the generator will have to run for longer period at a lower charge rate. The generator will also have to run longer to offset the battery charging losses (inefficiencies).
Do not oversize the battery bank with the goal of running in the engine only a few hours a week / month.

3. Selection of the generators power range on solar/wind hybrid applications is similar to paragraph 2.
The amount of solar and wind energy produced is subtracted from the load’s energy requirement. For example a 2 peak kW array at the site with strong sun can produce 10 kWh. Using the same 1.5 kW load over 24 period, we subtract the 10 kWh produced by the solar from 36 kWh requiring the generator provide the energy deficit of 26 kWh. therefore a 12 kW generator would run for 2.2 hours (not factoring in battery inefficiency).
Due to the present low cost of solar photovoltaic modules the size of the solar array is typically determined by either meeting 90% of load energy needs or the space limitations of the site.
It’s also important to note that the generator in hybrid applications should have sufficient capacity to run the site in the event the solar fails due to theft, charge controller or battery failure.

4. Selection of the alternator model and engine size are based on optimizing the generator run time in powering the load and recharging the battery and this is factored against the engine maintenance. The faster the generator speed the greater the power obtained from either the engine or the alternator; and the greater the power output the shorter the generator run time (but this requires a larger battery bank). Reducing the generator run time the lowers the engine maintenance, but requires larger battery banks and this will increase the operating costs and battery maintenance. Slower engine speeds (1400 to 2000 RPM) reduce engine maintenance and generator noise, but higher speeds (2200 to 3000 RPM) reduce generator size and cost. Best fuel efficiencies at around 2200 – 2400 RPM for small load variations, and around 1600 – 1800 for larger load variations. There is a balance between:

  • Generator run time and output power against battery bank size;
  • Generator versus battery bank capital cost;
  • Generator reliability versus battery reliability and maintenance.

5. Polar’s generator power ratings are based on continues duty operation. Unlike AC generators there are no power factor or power safety de-rations.

Polar’s power systems and DC generators are custom configured to meet your program needs. This form helps match your needs with our products and will help us provide you with a cost quotation. The more complete this form is filled out the faster we can respond to you.