Simple Solar Battery Charger Circuit

It is well known pretty much about solar panels and their features. The simple abilities these particular awesome devices is to transfer solar energy or sun light into electricity.

Essentially a solar panel is comprised discrete parts of individual photo voltaic cells. Each one of these cells have the ability to produce a small magnitude of electrical power, generally around 1.5 to 3 volts.

Most of these cells over the panel are cabled in series in order that the total useful voltage produced by the whole unit mounts up to an workable 12 volts or 24 volts outputs.

The current created by the unit is instantly proportional to the level of the sun light incident over the surface of the panel.

The power produced from a solar panel is usually employed for charging a lead acid battery. The lead acid battery when completely charged is utilized with an inverter for getting the needed AC mains voltage for running the house electrical.

Preferably the sun rays ought to be incident over the surface of the panel for it to function optimally. In spite of this since the sun is never still, the panel ought to monitor or carry out the suns path continuously so that it produces electricity at an effective rate.

If you happen to be planning to create an automatic dual tracker solar panel system you might introduce one of my prior content. Without a solar tracker, the solar panel are able to do the conversions only at around 30 % effectiveness.

Returning to our actual conversations regarding solar panels, this device might be regarded the heart of the system as far transforming solar energy into electricity is concerned, in spite of this the electricity created needs a number of dimensioning to be achieved before it may be utilized efficiently in the earlier grid tie system.

The voltage obtained from a solar panel is rarely sturdy and differs significantly in line with the position of the sun and intensity of the sun rays and of course on the degree of occurrence over the solar panel.

This voltage if given to the battery for charging may cause damage and unneeded heating of the battery and the connected electronics; consequently may be harmful to the whole system.

To be able to control the voltage from the solar panel usually a voltage regulator circuit is employed relating to the solar panel output and the battery input. This circuit ensures that the voltage from the solar panel by no means surpasses the safe value needed by the battery for charging.

Generally to get most effective outcomes from the solar panel, the minimum voltage output from the panel needs to be more than the essential battery charging voltage, meaning even throughout unfavorable problems when the sun rays are not sharp or maximum, the solar panel still ought to be able to yield a voltage greater than say 12 volts which can be the battery voltage under charge.

Solar Voltage regulators readily available can be overpriced and not so dependable; on the other hand producing the kind of regulator at home utilizing normal electronic parts could be not just fun but additionally risk-free.


Talking about the offered solar panel voltage regulator, charger circuit we notice a design that makes use of very regular elements and yet satisfies the requirements in the same way essential by our specifications.

A single IC LM 338 turns into the heart of the whole configuration and evolves into sensibly for applying the preferred voltage regulations single handedly.

The demonstrated solar panel regulator, charger circuit is framed as per the normal mode of the IC 338 configuration.

The input is provided to the demonstrated input points of the IC and the output for the battery obtained at the output of the IC. The pot or the preset is employed to precisely set the voltage level that could be regarded as the safe value for the battery.

The circuit also provides a current control feature, helping to make sure that the battery constantly obtains a fixed fixed charging current rate and is in no way over powered.

The module could be connected as instructed in the diagram. The appropriate positions mentioned could be basically cabled even by a layman. Rest of the function is looked after by the regulator circuit.

The switch S1 ought to be toggled to inverter mode once the battery gets fully charged (as suggested over the meter).

The charging current might be chosen by properly choosing the value of the resistors R3. It is possible by solving the formula:

0.6/R3 = 1/10 battery AH

The preset VR1 is adjusted for obtaining the essential charging voltage from the regulator.