Solar controller is one of the most important parts in your entire PV solar system, normally there are three main functions of a solar controller:

It keeps your batteries fully charged
It prevents your batteries from being overcharged
It prevents your batteries from being excessively discharged

Batteries are a key component in your PV solar powered energy system, you can only use the power your solar panels generate when the sun is out and you won’t have any power at night when you could really use it if no battery. The PV solar panel systems almost always gather power and store it in batteries, so nearly every system is going to require a solar controller.

A solar controller is designed to protect your batteries from being overcharged by your solar panels and it will block any reverse current (from the batteries) as well.

Solar controllers are specified by both amperage and voltage. For example, if one module in your 12 volt system produces 3. 5 amps and you’ve got four modules then you’re producing 14 amps of current at 12 volts. Because of light reflection and the edge of cloud effect, power output can spike above expectations. For this reason you need to increase the controller amperage by at least of 25% making the minimum rating your controller to 18 amps.

Don’t worry about ever getting a solar controller that is rated 2 or more times higher than your solar panel array. It’s not in any way a bad thing. In fact it’s actually better for two reasons: Your system will always be protected or You can add more solar panels in the future without having to change your controller.

During this time when prices of nearly everything seem to be climbing while incomes are not increasing, more and more people find themselves searching for ways to decrease costs. One category that hits people’s wallets particularly hard is that of energy costs. Solar panels are becoming increasingly popular as their technology becomes perfected and people find solace in a reliable way to effectively reduce or eliminate their monthly electric bill. There are two distinct categories of solar energy panels – those that feed energy to the local utility grid and those that use batteries to store captured solar power. For those who own solar panels with batteries, there is one minor drawback that has a simple remedy: a solar panel charge controller.

The specific problem is that batteries are designed to only handle so much energy at a time. If you are constantly bombarding your trusty batteries with an excessive amount of energy, they will quit being so trusty. Batteries are expensive, so you obviously want them to last as long as they were designed to. In order to save the life of your batteries, you must acquire a solar panel charge controller. It has but one function, and that is to prevent the solar panels from overcharging your batteries.

The early model of the solar panel charge controller is nothing like it is today. At its initial introduction, it was literally a mechanism to disconnect the panels from the batteries. Today, the technology is much more advanced. The key to purchasing the right one is to be attentive to the voltage. Whatever volt your batteries are, the charge controller should match. If you have already obtained a charge controller and realized you got the wrong voltage, don’t panic. Most controllers these days can be made to adapt, but if you have not yet acquired a charge controller, make things easier on yourself by matching the voltage.

The percentage of solar energy panel owners using batteries instead of being on the grid are becoming fewer and fewer. Many want to take advantage of the tax breaks, rebates and other incentives to being on the grid. If this is either not an option for you or you simply prefer to use batteries, prevent many unneeded headaches and dead batteries by utilizing a solar panel charge controller. You will end up saving yourself money, stress and hassle if you get one before your batteries are damaged.

Wellsee solar controllers improve your battery life, pls check the following functions:

1. Overload protection
2. Short circuit protection
3. Converse discharge protection
4. Reverse polarity connection protection
5. Thunder protection
6. Low voltage protection
7. Overcharge protection
8. Batteries stop and charge voltage HVD sets up
9. Charge and low voltage LCD sets up
10. Display the capability of the battery SOC
11. Loads and comeback setups.
12. Intellectualized temperature compensation
13. Record and calculate the charged AH and display it on the LCD screen.
14. Record and calculate the discharged AH and display it on the LCD screen.
15. CPU control and LCD display 

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