Difference between revisions of "Simplified energy storage sizing and selection/es"

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(Created page with "*Si un sistema está diseñado para una ubicación donde el clima y el recurso solar simplicada es muy...")
(Created page with "*Si un sistema está destinado a proporcionar energía en una ubicación donde los usuarios ajustarán su consumo de energía de acuerdo con el clima o si se usa con poca frec...")
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*Si un sistema está diseñado para una ubicación donde [[Special:MyLanguage/Simplified weather and solar resource evaluation|el clima y el recurso solar simplicada]] es muy variable, se debe aumentar el valor de los días de autonomía.
 
*Si un sistema está diseñado para una ubicación donde [[Special:MyLanguage/Simplified weather and solar resource evaluation|el clima y el recurso solar simplicada]] es muy variable, se debe aumentar el valor de los días de autonomía.
  
*If a system is intended to provide power at a location where the users will adjust their energy consumption according to the weather or that is used infrequently, fewer days of autonomy can be built into the system. A value of 2 days of autonomy may be appropriate in these cases as long as there is a sufficiently sized [[Special:MyLanguage/PV module|PV source]] or an additional form of generation.
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*Si un sistema está destinado a proporcionar energía en una ubicación donde los usuarios ajustarán su consumo de energía de acuerdo con el clima o si se usa con poca frecuencia, se pueden incorporar al sistema menos días de autonomía. Un valor de 2 días de autonomía puede ser apropiado en estos casos siempre que haya una [[Special:MyLanguage/PV module|fuente FV]] de tamaño suficiente o una forma adicional de generación.
  
 
*If a system is intended to provide power at a location that must operate continually, like at a health clinic, it is recommended that a significant number of days of autonomy are built into the system or that an additional form of generation, like a generator, is added to the system. An energy storage system with 5-7 days of autonomy for a health clinic will often be quite substantial in size, difficult to charge properly, and costly. Therefore, a backup generator should be considered in this case.  
 
*If a system is intended to provide power at a location that must operate continually, like at a health clinic, it is recommended that a significant number of days of autonomy are built into the system or that an additional form of generation, like a generator, is added to the system. An energy storage system with 5-7 days of autonomy for a health clinic will often be quite substantial in size, difficult to charge properly, and costly. Therefore, a backup generator should be considered in this case.  

Revision as of 12:39, 1 April 2021

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Un diagrama de flujo que muestra las entradas y salidas primarias del proceso de selección y dimensionamiento del almacenamiento de energía.

El sistema de almacenamiento de energía tiene un tamaño basado en los requisitos de energía diarios promedio del sistema. Los pasos preliminares de este proceso generan un tamaño en Ah sugerido para el sistema de almacenamiento de energía, pero luego es necesario determinar una configuración en serie y paralelo basado en las tensiones y tamaños de batería disponibles.

Premisas:

  • Se utilizan baterías de plomo ácido.
  • Las baterías se descargarán al 50% de profundidad de descarga.


Paso 1: Determinar el parámetro de días de autonomía

El parámetro de días de autonomía determina la cantidad de días que el sistema podrá satisfacer las necesidades energéticas sin carga de ningún tipo. Un día de autonomía proporciona suficiente capacidad de almacenamiento de energía para proporcionar energía para las cargas del análisis de cargas simplificada durante un día sin ninguna carga adicional. Cada día de autonomía adicional agrega un día adicional de capacidad de almacenamiento de energía. Por ejemplo:

  • Un batería de plomo ácido de 205 Ah x 1 día de autonomía = 205 Ah
  • Un batería de plomo ácido de 205 Ah x 2 días de autonomía = 410 Ah
  • Un batería de plomo de 205 Ah x 3 días de autonomía = 615 Ah

El valor que se elige para este parámetro depende en gran medida de la variabilidad del análisis del tiempo y recurso solar simplicada, el uso previsto del sistema y el presupuesto. Casi siempre es preferible tener almacenamiento adicional, por lo tanto, el presupuesto a menudo se convierte en la restricción principal. Hay varias consideraciones que intervienen en la determinación del valor que es apropiado para un diseño en particular:

  • Si un sistema está destinado a proporcionar energía en una ubicación donde los usuarios ajustarán su consumo de energía de acuerdo con el clima o si se usa con poca frecuencia, se pueden incorporar al sistema menos días de autonomía. Un valor de 2 días de autonomía puede ser apropiado en estos casos siempre que haya una fuente FV de tamaño suficiente o una forma adicional de generación.
  • If a system is intended to provide power at a location that must operate continually, like at a health clinic, it is recommended that a significant number of days of autonomy are built into the system or that an additional form of generation, like a generator, is added to the system. An energy storage system with 5-7 days of autonomy for a health clinic will often be quite substantial in size, difficult to charge properly, and costly. Therefore, a backup generator should be considered in this case.
  • The days of autonomy value that is chosen will be used to size the energy storage system to meet energy demand when the battery bank is new, but the storage capacity of the energy storage system will gradually decline over time. Therefore, oversizing a battery bank to take this into account is a good idea.

Step 2: Determine minimum Ah value

Using the chart below, find the minimum recommended Ah value based upon the DC system voltage and the Total daily watt-hours required. Cells highlighted in red are not recommended configurations - a higher or lower DC system voltage should be used. Cells highlighted in yellow situations are questionable configurations - a higher or lower DC system voltage should be considered. These recommendations are based upon commonly available battery sizes, equipment availability, and the best practice of using a low number of parallel battery circuits (a maximum of 3 is recommended).

Ahchart2101191.png

Step 3: Adjust minimum Ah value for temperature

The minimum Ah value (Step 2) must be adjusted for the minimum temperature that the batteries will reach during operation. The temperature of lead acid batteries has a significant effect upon performance. When lead acid batteries reach a temperature below 25°C, their usable capacity begins to decline. This can lead to batteries being deeply discharged and damaged, therefore the size of the energy storage system should be adjusted to ensure that there is adequate energy available at the minimum expected indoor temperature for the location. This temperature value is just an estimation that allows the energy storage system to be increased in size to account for lower temperatures. Correction factors for various battery types:[1]

Temperature FLA AGM Gel
25°C 1.00 1.00 1.00
20°C 1.06 1.03 1.04
15°C 1.13 1.05 1.07
10°C 1.19 1.08 1.11
5°C 1.29 1.14 1.18
0°C 1.39 1.20 1.25
-5°C 1.55 1.28 1.34
-10°C 1.70 1.35 1.42
Temperature adjusted minimum Ah required = Minimum Ah value (Step 2) × Temperature correction factor

Step 4: Determine battery voltage, Ah rating and wiring configuration

Choose a battery based upon what is available in the market to proceed with the design. Lead acid batteries are commonly available in 2V, 4V, 6V, 12V designs that can be wired in series to achieve a 12V, 24V, or 48V system voltage. See Battery wiring for more information on how to properly configure a battery bank. With small systems 12V batteries are the standard, but as system size increases lower battery voltages lead to more storage with fewer parallel strings, which is a better design. Deep cycle batteries with voltages below 12V can be difficult to find in some locations.

Batteries in series = DC system voltage ÷ Chosen battery voltage

Lead acid batteries are available in a variety of Ah ratings. They can be wired in parallel to achieve the desired total Ah of storage for the system. The result of this calculation should be rounded up, meaning that if the number of parallel strings is more than 1, then 2 parallel strings are required. The other option would be to use a battery with a higher Ah rating.

Number of parallel battery circuits = Temperature adjusted minimum Ah required (Step 4) ÷ Chosen battery Ah rating

Step 5: Calculate final Ah capacity

The final Ah capacity of the battery bank is the chosen battery Ah rating multiplied by the number of parallel strings. This value is important for other calculations in the design process.

Final Ah capacity = Number of parallel battery circuits (Step 4) × Chosen battery Ah rating (Step 4)

Notes/references

  1. Trojan Battery Company - Battery Sizing Guidelines https://www.trojanbattery.com/pdf/TRJN0168_BattSizeGuideFL.pdf