Solar cells are the converters that convert gentle power into electrical energy, and do not store electrical vitality, so the lifePo4 battery is essential when there isn't any light or energy to the load This chapter describes the lifePo4 batteries which might be commonly used in solar power technology systems.
The battery utilized in photo voltaic energy technology system, generally known because the secondary battery, the use of rechargeable batteries, photovoltaic energy generation system in the battery, as a floating charge of the work, no cost have to be little or lithium battery pack no discharge.Basically, The battery for digital products is a silver oxide battery or a sluggish discharge kind nickel-cadmium Lipo battery pack, and a low-discharge sort lead-acid battery is used for the electric energy. For such a secondary battery, the following properties are typically required:
The use of photo voltaic cells within the atmosphere have lengthy-term stability of the cost and discharge characteristics,
For the reason that variation range of the sunshine incident on the photo voltaic cell is large, the charging efficiency is excessive in a variety of the charging current.
- Overcharge resistance, over discharge.
- In the usage of self-discharge setting is small.
- Long cycle life.
- No leakage, no gas emission, or much less leakage, less fuel emission.
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- low cost
The so-called floating charging system, refers to the ability supply (such as solar cells> related with the battery well, when the power input energy, in addition to offering load turtle power, but in addition a small present on the battery charge, and when the power is not any energy enter, the battery Discharge to the load power provide.
Nickel-cadmium battery anode energetic materials is nickel oxide, cathode lively substances is cadmium, and electrolyte with potassium hydroxide, lifePO4 battery pack such open sort and closed sort two, lately, principally in closed kind.
Ni-Cd batteries have the following advantages:
- Resistance to overcharge, over discharge capability, generally do not set up a stable charging circuit will also be used
- Long life, charge and discharge cycles of a number of hundred times or more, the shallow depth of discharge mild load, the cost and discharge cycle of up to a thousand times,
- The interior resistance is small, there may be high-velocity discharge, and the discharge voltage fluctuations
- Can be used in a large temperature vary,
- And the dimensions of the same battery, the operating voltage can also be close, so there may be interchangeability.
The battery has the next disadvantages:
- Self-discharge bigger
- Capacity quantity is comparatively small
photo voltaic powered portable generator, charging is carried out at a rate of less than 1/10 of the battery capability C, that's, lower than 0.10C, in a special case, and the newly charged quick-charge type can be charged with a current of less than 0.33C. Usually the foundation of the charge current to think about the output of photo voltaic cells to 0.10C of current to cost, to reach full cost to be greater than 10h.Therefore, is the biggest day of the sunshine time is very brief, only 3-4h, Therefore, the world of photo voltaic cells with electronic products must be large, sometimes the utmost sunshine when the cost present to about 0.3C to make use of, but the precedence in battery life, the current limiting resistor can be linked in collection to the charging circuit , In order that the input present is lower than 0.1C.