Friends, till now we have learnt few basic things about solar panels, solar charge controllers and their working along with the designing of the solar power system. Now, for an effective and efficient solar power system, battery plays a very important role. It is true that your system will not work when there is no sunlight and its performance can fall significantly, when the sunlight is less due to cloudy weather, dust, haze etc. Here you need something which can support and back up your solar power system that can fulfill your electricity needs.
Obviously, in such conditions or circumstances the performance of your system will depend on the choice of your battery.
(1) Type of batteries
Either you choose normal flat plate battery or solar tubular battery, both will work but with different efficiency levels. Solar tubular batteries which are especially designed for the Solar PV applications are having higher efficiency. These two types of batteries get their name on the basis of the design of their positive plate (the design of the negative plate is same in both the technology); in case of flat plate battery, the positive plate is grid type while the solar tubular battery has series of tubes or spines as a positive plate. Well, not going into technical details, the manufacturing process of tubular battery is more complex and has more steps, which makes it more effective and efficient than its flat plate counterpart. It has certain advantages over normal battery.
(2) High charging rate
The solar tubular battery has the capability to get charged in low current. So, in bad weather when the sun light is less, the charging rate of the tubular battery will be more than the normal battery.
(3) Low Electrical resistance
The tubular technology battery has low electrical resistance than the flat plate battery. It facilitates the energy transfer by easy movement of the electrolyte present in the battery.
(4) Low self discharge
The self discharge rate in tubular battery is very low. The battery will not go empty even if it is kept idle for a long time.
(5) More electrical capacity and extra back-up
The increased surface area of the positive plate of the tubular battery gives extra 20% electrical capacity than flat plate battery of the similar size and weight. The battery discharge rate of solar battery is C10 whereas the other normal batteries have C20 rating. The C10 rating has extra backup than C20 rated battery.
(6) Stable performance
Its good mechanical resistance and the elasticity of the tubes ensure the stable performance.
(7) Longer life
The less shedding of the positive plate of the solar tubular battery provides it a longer life than its flat plate counterpart.
(8) The solar tubular batteries are costlier
Yes, the solar tubular batteries are costlier than the flat plate battery of the same specification.
A 12 V/150ah Solar Tubular battery will cost you around Rs.11000/- while a same specification flat plate battery will be around Rs.9000/-.(Its extra benefits justify the cost)
The Solar tubular battery delivers energy faster, has at least 20% extra energy capacity, with same size and weight, and has longer life than the flat plate battery.