Charging your rechargeable batteries with a solar panel is a great way to use clean, renewable energy. Solar panels can be used to charge batteries. But, more often than not, a battery cannot directly plug into the solar panel itself. A charge controller will usually be needed, which protects the battery by converting the panel’s voltage output to one that is suitable for the battery being charged. So before you get started, you’ll need to install a charge controller, which regulates the voltage from the solar panel as it’s transferred to the battery. Otherwise, on sunny days, the solar panel may produce more energy than your battery can handle, which can damage the battery.
Following are some simple steps to connect solar panels to battery :
Here’s the wiring diagram showing how to connect a solar panel to a battery:
It’s important to understand the following:
There are two main types of charge controllers, and you will need to decide which one will work best for your needs and the solar panel system that you have.
A PWM is the simpler, standard type of charge controller and also the less expensive option. When using a PWM, the solar panels’ voltage and the battery need to be the same.
The PWM works by sending charge pulses to the battery. When the battery is discharged, it sends a long, near-continuous pulse to charge the battery. When it is basically fully charged, it sends very short pulses that keep the battery charged.
These controllers are more suited to smaller solar panel operations, and do not make full use of a solar panel system’s maximum power output.
If you’re just starting to experiment with solar power, a PWM charge controller can be a good point of entry. These controllers use pulses of energy to charge the battery, and they monitor the power in the battery to ensure it isn’t overcharged.
It’s recommended you fuse your system. Safety best practices. Place one fuse between the positive battery terminal and the charge controller. Place another between the positive solar panel wire and the charge controller.
The MPPT controller can pair a solar panel system and battery of different voltages. And, as the more complex controller, an MPPT charge controller can be up to 30% more effective at storing and transferring energy than PWM models. It is also more expensive than PWM models, but the increased energy efficiency can quickly make up for the price difference.
This controller will basically track the panel’s output and voltage that is needed by the battery. It then matches the panel’s output with that voltage to ensure that the battery is always charging optimally, i.e., that the maximum amps are put into the battery.
MPPT controllers are great when you have higher voltage panels and also offer the flexibility for systems to grow.
1.Check the wattage of your solar panel. Normally there is a sticker on the back of solar panel , it lists the watts it will produce. For example, you might see 500W listed on the back of your panel, which means the array produces 500 watts of energy.
2 .Divide the solar watt rating by the voltage of your battery. You can usually find the voltage listed on the battery itself. Divide this number into the wattage of your solar panel. This will give you the amps that your charge controller needs to be able to handle in order to safely charge the battery. Often, charge controllers will be rated in multiples of 30 amps, so when you get your number, round up to the next highest rating.
Note: At this point we recommend you to put on your gloves and safety glasses when working with batteries.
Follow the instructions in your charge controller’s manual for connecting it to the battery.
Connect the negative battery cable. The one without the fuse, to the “-” battery terminal on the charge controller.
Connect the positive battery cable. The one with the fuse, to the “+” battery terminal. ( connecting the battery cables to the charge controller before connecting them to the battery.)
Connect the battery cables to the battery terminals — negative first, then positive.
Your charge controller should turn on or light up to indicate the battery is properly connected.
Warning: In order to prevent a sudden surge from damaging the charge controller, it’s best to connect the battery before the solar panel.
Most solar panel cables come with pre-attached MC4 connectors. To connect a solar panel to a charge controller, you need MC4 solar adapter cables.
Use MC4 connectors to connect the wires to the charge controller. The output wires on solar panels are typically fitted with MC4 connectors, which are long cylindrical fittings that have a male and a female side. In order to ensure they connect correctly, fit the wires running from your charge connector with MC4 connectors. Attach the bare ends of the input wires to the charge connector, the same way that you attached the output wires. Slide them into the input ports and tighten the screws with a screwdriver.
Once you’ve attached the input wires to the charge connector, you should have 2 wires, each ending in an MC4 connector. Match up the male and female connectors with the opposite ones coming away from the solar panel, and snap the MC4 connectors into place. You should hear a “click” when the connectors are seated securely.
When connecting solar panels in parallel or series, you need to consider what the total output voltage and amperage are so that you can select an appropriate solar charge controller.
If connecting solar panels in series. The total system voltage is the sum of each individual panel’s voltage, while the amperage remains the same. In parallel, the total amperage is the sum of each panel’s, while voltage remains the same.
Most charge connectors have a digital screen that will show you the output that’s flowing to the battery. If the readings are 0, double-check that everything is hooked up correctly.
Leave the battery on the connector until it’s charged. How long time it will take to charge your battery will depend on the capacity of the battery you’re using, the wattage of the solar panel, and even the weather that day. That’s where your digital display will come in handy. When you notice the output dropping, it’s likely that the battery is close to fully charged.
Since the charge connector will stop the flow of energy to the battery once it’s charged, it’s fine to leave it on the charger until you need it!
Now it’s time to select your own solar storage system. No matter what kind of 12v rechargeable battery you need or 24v battery, 48v battery or other type of batteries you want, you can find a suitable one at Egber new energy technology co.,ltd!
