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Can You Leave a Solar Trickle Charger on While Driving?


What comes to mind when you consider solar trickle chargers? Trickle chargers for solar batteries are flexible devices. If you live in a remote area and are not close to a power outlet, they can be helpful.

Handy and more effective solar panels can now be produced by solar panel manufacturers. Due to this advancement, they are now able to use smaller panels for a variety of tasks, such as solar-powered flow chargers that let you use the sun to recharge your car battery.

Too much time spent using it will reduce the battery’s capacity. When using a solar trickle charger maintainer, there is no chance of damaging a battery’s capacity. These gadgets are gaining considerably more traction than conventional battery chargers.

A Solar Trickle Charger: What Is It?

A device that uses solar energy to charge different gadgets is called a solar trickle charger. These low-power chargers work great for recharging laptops, and smartphones. They can be left connected at all times, giving these appliances an outlet at home without drawing power from the grid.

It’s also a fantastic option for charging batteries, and it can be applied either way without overcharge protection, though it’s typically advised to employ a solar trickle battery charger with overcharge security.

How Does a Solar Trickle Charger Function?

A solar panel consists of numerous solar cells and provides power to a solar trickle charger. When exposed to sunlight, a solar cell produces an electrical current that it transfers to a charging apparatus, which then uses it to power the connected devices. A solar flow charger’s power rating is between 0.5-10 watts.

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Watts are used to measuring the output of solar panels, and they can differ between models. Solar panels have a maximum output of 350 watts, but sunlight trickles chargers only have a few watts of power. The irradiance is a measurement of the quantity of solar energy achieving the panel is a significant factor.

Also referred to as the maximum hours of sunlight for a specific location, this value serves by solar panel installers to estimate the kWh output energy of solar trickle chargers.

Can a Solar Trickle Charger be Left on Continuously?

Continuous connection of solar trickle chargers depends on the battery size and the charger’s ability. Massive batteries can typically be left connected to smaller solar trickle chargers without the risk of overcharging the battery.

This is due to the battery size, they are merely pumping a sufficient current to maintain the battery’s charge and prevent its depletion from the car’s electronics, like a car alarm.

A 1.5W, 12V solar trickle charger, for instance, can be permanently connected to a 50Ah car battery without running the risk of damaging it because it is only pumping a maximum of 125 mA. You shouldn’t permit a smaller battery, such as a 7Ah, to charge constantly to prevent overcharging.

Can You Leave a Solar Trickle Charger on While Driving

Trickle charge your 12 Volt lead-acid batteries with a smart charger could have an impact on the lifespan of your batteries.  The key distinction between the two chargers is their capacity to automatically shut off and avoid overcharging batteries, which can cause serious damage and overheating.

Both are designed to slowly emit low-voltage charges to your vehicle battery over several hours.  The capability of some maintenance chargers to de-sulfate and clean battery plates, restoring them to normal operation and extending battery life, is another significant difference.

Although these chargers will never overcharge a car battery and are safe but solar current will be insignificant compared to alternator current, it is advised to disconnect the solar charger while the engine is running.

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A battery can boil its electrolyte if a trickle charger is left unattended for an extended period. A dead battery or, in the worst case, a possible fire or explosion would result. So, don’t leave your solar trickle charger on while driving the car.

Is a Solar Trickle Charger Safe to Leave Connected?

It is feasible to keep a solar trickle charger connected directly to the battery, supplying an excessive amount of current to the battery for an extended period even though the battery has a small capacity, or if it lacks an electronic module that prevents overcharging.

As it has a blocking diode built into it, it can be left connected without harm, the charging system doesn’t give a damn either. A solar car charger is typically able to be left on all the time but it isn’t advised.

If left connected to a 7Ah or 10Ah battery constantly, an 8W solar trickle charger may overcharge the battery. Check whether the solar trickle charger has built-in overcharging protection or the suggested battery sizes for connecting to it in the user’s guide to prevent damage from overcharging.

How to Use a Solar Trickle Charger to Avoid Battery Damage

As long as it isn’t boiling the battery, there is never a need to disconnect it. You should use a solar controller with larger solar panels. If the solar panel is only a few watts or less, it is safe to leave the trickle charger connected all the time even without a solar controller.

To prevent destruction from overcharging, link your charger to the recommended battery capacities. To avoid overcharging smaller batteries, connect them to a charging device with overcharge protection.

Check the owner’s manual for the solar trickle charger. The sunlight-powered trickle charger is unable to fully recharge a dead battery. Use a high-quality three- or four-step battery charger instead.

How Long Should a Solar Trickle Charger Be Left On?

A battery can be charged using some trickle chargers indefinitely. These would be installed on a vehicle that is not regularly used or that is kept in storage over the winter or summer.

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Since most trickle chargers only use a few amps of power, it can take up to 48 hours to fully charge a battery. Some smarter trickle chargers can even be left on for several days at a time, but it’s best to confirm this with the manufacturer first.

If the solar trickle battery has a safeguard that stops overcharging the battery, or if you use it with batteries of the suggested capacity (Ah) and the vehicle is not running, you may keep the battery connected. Never start the car while the solar trickle charger is connected, or if the engine is already running!

Can You Unplug a Car Battery Charger Without Disconnecting It?

If you mean departing the clamps linked to the battery while unplugging the AC adapter, that should be 99% safe. The majority of chargers have some sort of rectifying mechanism (a transistor, at the very least, a diode bridge) at the output, preventing a sizable reverse current that would release the battery.

If it is an LCD screen without a backlight, you wouldn’t be concerned because the current drawn will be in the milliamp range; however, LED or backlit displays draw hundreds of mA. A 100mA draw equals 2.4 Ah in a day and 10Ah over four days. That might be important for a tiny (7Ah) battery.


A car battery can be continuously connected to a solar trickle charger if the engine isn’t running. The majority of commercial chargers are made to either produce little power or have over-charge protection.

If a solar trickle charger has built-in overcharging protection or is linked to the suggested battery capacity (Ah), it can be left attached to a battery. To determine whether it is secure to leave it linked to the battery, constantly consult the owner’s manual for manufacturer recommendations.

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