During the design phase of a photovoltaic or wind power plant, especially if it is a stand alone one, you have to think about the choice of the battery. There are different types of on the marketaccumulators for photovoltaics specifically designed, however, those who want to save can purchase different models of batteries and then connect them in series or in parallel to obtain the desired capacity. On this page we will describe the most popular types of batteries to be applied to photovoltaics.
Accumulators for photovoltaics, models
In the articleStorage systems for photovoltaicswe have already explained how these particular batteries work. Who decides to buyaccumulators for photovoltaicsyou can choose whether to connect the various batteries together (in series or in parallel) in order to have a higher output capacity or a higher rated voltage, depending on your needs.
Theaccumulators for photovoltaicsare essential in a independent photovoltaic system (also said photovoltaic system stand alone, off grid or stand alone) and are also useful in the domestic context, to minimize any constraints with the city electricity grid.
Below we talk aboutaccumulators for photovoltaicsbut it is clear that the same technologies can also be used in the case of energy accumulation produced by other renewable sources such aswind powerdomestic.
- Lead-acid batteries such asaccumulators for photovoltaics
This type of accumulator is mainly used in the automotive sector. Given the widespread use of lead-acid batteries, prices are more affordable. Among the advantages, in addition to the price, we find the ability to deliver very high currents and to withstand low temperatures. Among the disadvantages of this technology we include the danger (lead is a toxic metal), they are very heavy, can be bulky and are not suitable for prolonged discharges due to the phenomenon of sulphation. Lead-acid batteries lose a lot of capacity due to mechanical stress.
- Gel batteries likeaccumulators for photovoltaics
Again the technology islead-acid but here the electrolyte is not liquid but gelatinous. They are low maintenance batteries and are suitable for very deep discharge cycles, they have a duration that can be three times longer than that of classic lead-acid batteries. They withstand a high number of charge-discharge cycles. On the other hand, they have a higher cost than the classic lead-acid accumulators and can also be more delicate (if loaded badly, the storage performance drastically decreases).
- AGM batteries such asaccumulators for photovoltaics
These are compact accumulators, immune to short circuits and very resistant to mechanical stress. The average life is about 10 years, they have been developed to withstand the elements and can be mounted in any position. They do not suffer from high temperatures and in case of rupture of the casing the loss of acid is contained. Among the features we point out a low self-discharge, very high inrush currents and greater capacity in charging. These are ideal batteries for aphotovoltaic system(or wind). The only disadvantage is the price, they are slightly more expensive than gel batteries but more affordable than accumulators developed ad hoc.