How Much Electricity Does A Car Battery Trickle Charger Use?

  • Alternators aren’t designed to charge completely dead batteries, which is where a trickle charger comes in handy. It would cost less than 0.1 penny per day to run your trickle charger for two hours each day. That works out to about three cents per month!
  • Regular battery chargers produce 1 to 50 amps, and if they have a jump start mode, they can produce up to 200 amps.
  • A trickle charger uses low amperage to charge your car and can charge it as quickly as slowly as you need. Trickle chargers typically produce 1 to 3 amps.

Is it true that automobile battery chargers consume a lot of electricity?

Electric vehicles can be charged with power consumption similar to that of common household appliances. Most electric vehicles charging at home on a 240-volt level 2 charger will need less than 7,200 watts. A typical electric furnace consumes 10,000 watts, whereas a water heater consumes 4,500 watts. The electric vehicle supply equipment (EVSE) or the car’s onboard charger, which limits the rate of electricity the vehicle can receive, limit the power demand for an electric vehicle. Onboard chargers in many first-generation plug-in vehicles are restricted to 3,600 watts, which is comparable to the power consumption of a normal house air conditioning system, however newer electric vehicles have greater onboard charging rates. When compared to level 2 charging, some owners merely utilize a conventional 120-volt household outlet (level 1 charging), which has a very slow charge rate and minimal power drain. Some electric vehicles, such as those made by Tesla, allow for even faster charging at home and higher power needs, akin to that of an electric heater. While an electric vehicle can consume a significant amount of electricity while charging, its overall fuel cost is lower than a comparable gasoline vehicle.

Is it possible to leave a trickle charger running all the time?

The length of time you’ll need to utilize a battery conditioner or trickle charger is determined by the battery’s state and the conditioner’s/performance. charger’s

It can take up to four weeks for a battery conditioner to break down lead-sulphate deposits and condition your battery to receive a full charge. However, this is dependent on how low the voltage has dropped and how long the battery has been kept in this state.

Because most trickle chargers only use one to two amps of power, charging a battery to full capacity can take up to 48 hours. Some intelligent trickle chargers can even be left on for days or weeks at a time, but verify with the manufacturer to see if this is possible.

What is the energy consumption of a car battery maintainer?

That’s around 0.00068 kW-h in an hour. You calculate $0.11 per kW-h, or $0.054 per month for continuous operation. Because the maintenance charge can fluctuate up to 100 mA, I estimate a monthly peak of $0.10.

What is the wattage of a trickle charger?

A solar panel, which is made up of many solar cells, is used to power a solar trickle charger.

35 cells and a Voc (open circuit voltage) of 21 volts make up the panels used to charge 12 volt batteries.

A solar cell converts sunlight into electricity and sends it to a charging device, which then charges the gadgets that are linked to it. A solar trickle charger’s usual power rating is 0.5-10 watts.

Is it true that trickle chargers harm batteries?

Overheating can occur if an unsupervised trickle charger is left on for too long, causing the battery to boil the electrolyte. The result would be a dead battery or, in the worst-case situation, a fire or explosion.

What is the power consumption of a 12v battery charger?

Because 12 volt charger technology has kept up with the microprocessor revolution, modern battery charging philosophy employs microprocessor-controlled charging patterns in three stages (or two or four stages).

These are “smart chargers,” and good ones are hard to come by in bargain stores.

Bulk, absorption, and float are the three stages or steps in lead/acid battery charging (or complete shut off in some cases). Qualification, sometimes known as equalization, is a stage that is occasionally overlooked. Bulk and float stages will be present in a two-stage unit. To maintain battery capacity and service life, follow the charging processes and voltages recommended by the battery manufacturer, or use a high-quality microprocessor-controlled charger.

The previous 12 volt chargers had a fixed charging voltage that was high enough to “push” energy into the battery (amps).

The easier this forcing process is, the lower the initial battery voltage (state of discharge), therefore you may see the amp meter (if provided) run up to the charger’s maximum output amperage and stay there for a time.

The tougher it is for the 12 volt charger to force the amps in as battery resistance grows, as it does when the state of charge rises, so the amp rate lowers. When the charger’s output voltage can no longer force any more into the battery, current practically ceases. However, depending on where this voltage threshold is, it may be high enough to overcharge the battery over time, or keep it in the gassing stage, drying out a flooded type battery. For this reason, these chargers should be closely watched and disconnected when the amp meter reaches the lowest setting.

The “smart chargers” are designed with today’s charging philosophy in mind, and they also use data from the battery to deliver maximum charge benefit with minimal monitoring.

Special settings or charges may be required for some gel cell and AGM batteries.

True Gel batteries require a specific charge profile, which necessitates the use of a gelspecific, gel selected, or gel appropriate charger.

Gel batteries have a peak charging voltage of 2.3 to 2.36 volts per cell, which translates to 13.8 to 14.2 volts for a 12 volt charger, which is less than a wet or AGM battery requires for a full charge.

When the voltage in a Gel battery is exceeded, bubbles form in the electrolyte gel, resulting in lasting damage because the bubbles do not disperse when the over voltage condition is removed.

Three Stage Battery Charging

With a 12 volt charger, the BULK stage accounts for around 80% of the recharge, during which the charger current is held constant (in a constant current charger) while the voltage rises. A properly sized charger will provide the battery with as much power as it can handle up to chargercapacity (25 percent of battery capacity in amp hours), while not raising a wet battery beyond 125 degrees Fahrenheit or an AGM or GEL (valve regulated) battery above 100 degrees Fahrenheit. For AGM or some flooded batteries, the target voltage for a 12 volt charger is 2.4 to 2.45 volts per cell, or 14.4 to 14.7 volts. Some flooded cells can withstand voltages of up to 15 volts.

The AGM/flooded 12 volt charger’s ABSORPTION stage (about the final 20%) involves the charger holding at the absorption voltage (between 14.4 VDC and 14.7 VDC, depending on charger set points) and gradually decreasing the current until the battery is fully charged.

The battery may have some permanent sulphation if it won’t maintain a charge or the current doesn’t diminish beyond the specified recharge period.

The charge voltage is dropped to around 2.25 volts per cell (around 13.5 VDC) and held constant in the FLOAT stage, while the current is reduced to less than 1% of battery capacity.

This mode can be used to keep a fully charged battery for an infinite period of time. Instead of maintaining a float voltage, some chargers turn off and monitor the battery, commencing a charge cycle if necessary.

Divide the amp hours to be replaced by 90 percent of the charger’s rated output to get an estimate of how long it will take to recharge.

A 100 amp hour battery with a 10% discharge, for example, would require 10 amps to be replaced.

We got 10 amphours/(.9×5) amps = 2.22 hour recharge time estimate using a 5 amp 12 volt charger. A battery that has been deeply drained deviates from this formula, needing more time to replace per amp.

Experts differ in their suggestions for how often you should recharge.

It appears that the depth of drain has a greater impact on battery life than the frequency with which it is recharged.

Lead acid batteries, even sealed varieties (AGM and Gel), prefer to be maintained fully charged as much as feasible.

Recharging when the equipment is not going to be utilized for a while (for example, during a mealbreak or whatever) can keep the average depth of discharge over 50% for a serviceday.

This primarily applies to battery applications where the average depth of discharge per day is less than 50% and the battery can be fully recharged once per 24 hours. This is referred to as “opportunity charging.”


Equalization is essentially a charge that may be managed. Although some charger manufacturers refer to the peak voltage reached by the charger at the end of BULK mode (absorptionvoltage) as an equalization voltage, it is not strictly correct. This approach can benefit higher capacity wet(flooded) batteries, especially those that are physically tall. If a wet battery is not cycled on a regular basis, the electrolyte might stratify over time. In equalization, the voltage is raised over the typical peak charging voltage (to 15 to 16 volts in a 12 volt charger) and kept for a set (but limited) period deep into the gassing stage. This stirs up the chemistry throughout the battery, “equalizing” the electrolyte’s strength and removing any free sulphation on the plates.

The design of sealed batteries (AGM and Gel) virtually eliminates stratification, and almost all makers of these batteries advise against it (advising against it). Although certain manufacturers (particularly Concorde) provide a technique, it is vital to follow the voltage and time parameters to avoid battery damage.

Volt Charger Sizes

A low milliamp output (100, 200, 500 milliamps), up to 90 amps, 12 volt charger that plugs into a 115 volt power outlet is available (chargers above about 65 amps usually require a 20 amp circuit, so check). Some of the smaller components, like antique chargers, are unregulated and merely have a fixed voltage output. These take a long time to charge and should be avoided if at all feasible. Smaller amp capacities are suited for smaller batteries, such as those found in motorcycles, ATVs, and other off-road vehicles, as well as electrical and security applications requiring 1.3 to 12 amp hours. They can also be used to maintain larger batteries. A medium amp output 12 volt charger would be in the 20 to 50 amp range, and could be used for a variety of applications requiring 100 amp hours of battery or more, as well as applications requiring a consistent amp load (power supply application). To protect the charger from moving back into the boost or bulk stage in a power supply situation, the constant draw should be a small percentage of the charger maximum amp capacity, or the charger should have selectability for the power supply or”battery with load” mode. The power of larger units of the 12 volt charger models ranges from 55 to 90 amps. These are utilized in battery banks with a lot of amp hours or in applications that need to recharge quickly (possibly at the expense of maximum battery life). When a generator is employed as the AC power source, the larger units are sometimes utilised, and generator run time is taken into account.

The charger should be roughly 25% of the battery capacity (ah = amp hour capacity), according to most battery manufacturers.

As an example, a 100 ah 12 volt battery would require a 25 amp 12 volt charger (or less).

Larger chargers can shorten charging times, but they can also shorten battery life.

Smaller chargers are fine for long-term floating, such as a 1 or 2 amp “smart charger,” but they would be inefficient or burn up if used to bulk charge large capacity, deeply drained batteries.

How much power is required to charge a 12 volt battery?

A 100 amp hour battery will take five hours to charge when charged at 12 volts and 20 amps. You’ll need 240 watts of solar power if you multiply 20 amps by 12 volts, thus we recommend a 300 watt solar panel or three 100 watt solar panels.

Is there a difference between a trickle charger and a battery charger?

A trickle charger differs from a battery charger in that it continuously applying a charge, regardless of whether the battery is completely charged or not. A battery charger, on the other hand, has circuitry that monitors the voltage of the battery and only charges it when it falls below a preset threshold, preventing overcharging and damage.

A battery charger will restart charging when it detects a reduction in voltage. As a result, a battery charger can be left plugged in indefinitely. A trickle charger, on the other hand, should be disconnected and reconnected on a regular basis, possibly once or twice a month for a day.

I’d be remiss if I didn’t point out that there are other precautions you should take before leaving a car for an extended period of time.

If you don’t intend to give it some activity – a 20-mile drive once a month, for example – have the dealer or service facility change the oil and filter before storing it, regardless of mileage.

Before putting it away, add gasoline stabilizer, fill the tank, and drive for 10 or 20 miles.

In an ideal world, you’d set it on jack stands to keep the tires from flattening out and to allow for air circulation in the garage, which is especially important in Arizona during the heat.

How long does it take a 12 volt battery to trickle charge?

Trickle chargers are commonly available in two amp sizes.

There are two types of chargers: 1-amp and 2-amp chargers.

In comparison to 1-amp chargers, 2-amp chargers offer some intrinsic advantages. They have the most significant advantage of being able to charge your battery in half the time.

If your battery is entirely dead, a 1-amp trickle charger will take 48 hours to fully recharge it; whereas, a 2-amp trickling charger will take only 24 hours. While it will still take some time to fully recharge your battery, it will be much more effective to do so in half the time.

Furthermore, while charging your battery too quickly or too frequently will shorten its shelf life, with a 2-amp trickle charger, you won’t have to worry about that. The charge is still slow enough to avoid causing any harm.

The price difference between a 2-amp charger and a 1-amp charger is the most significant disadvantage. The greater price tag is worth it if you’re going to use it frequently, but if you’re just keeping it in your garage in case you need it once or twice a year, the 1-amp charger will definitely enough.