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Your position: Home > News > Industry News > Battery capacity calculation for photovoltaic power generation engineering

Battery capacity calculation for photovoltaic power generation engineering

the Internet 2018-12-26 14:08:04
The battery capacity is determined based on the user's power consumption or expected standby time.

The task of the battery is to ensure the normal use of the system load when the amount of solar radiation is insufficient. For important loads, it is necessary to ensure the normal operation of the system within a few days, and the number of consecutive rainy days should be considered. For general loads such as solar street lights, etc., it can be selected within 2 to 3 days according to experience or needs. Important loads such as communication, navigation, hospital treatment, etc. are selected within 3 to 7 days. Also consider the installation location of the PV system. If it is located in a remote location, the battery capacity should be designed to be large, because it takes a long time for the maintenance personnel to arrive at the site. In practical applications, some mobile communication base stations are very inconvenient because of the high mountain roads. In addition to the normal battery packs, a set of spare battery packs is also required. For the general poor families, the price is mainly considered. Rainy days, when the sun is good, it is more useful. Use less when the sun is not good, not when there is no sun. When selecting a load, try to use energy-saving equipment such as LED lights and inverter air conditioners. The design of the battery mainly includes the design calculation of the battery capacity and the design of the battery pack series-parallel combination.

inPhotovoltaic power generation systemMost of them use lead-acid batteries. Considering the battery life, the discharge depth is generally between 0.5 and 0.7. Battery design capacity = (load daily average power consumption * continuous rainy days) / battery discharge depth.

The charging current of the battery is generally 0.1C-0.2C, and the maximum is not more than 0.3C. For example, a lead-acid battery 12V200AH, the charging current is generally between 20A and 40A, the maximum can not exceed 60A; the discharge current of the battery is generally 0.2C- 0.5C, the maximum does not exceed 1C, 1 section 12V200AH lead-acid battery, the maximum output power does not exceed 2400W, different manufacturers, different models, the specific values ​​are also different, the design should ask the manufacturer for instructions.

Disclaimer: The content is partly from the Internet. For the purpose of transmitting more information, it does not mean agreeing with its views or confirming its description. Article content is for reference only.