The question β63 ampere β how many kilowatts is that?β often arises when planning the installation of powerful additional equipment, such as audio systems, winches or preheaters. Understanding the relationship between current strength and power is critical to avoid overheating wiring or failure. battery. The prime number 63 does not itself speak of power until we determine the voltage in the circuit.
In the automotive environment, the standard is 12 volts, but when the engine is running, the generator raises it to 14-14.5 volts. For household networks, which often charge electric cars or connect garage equipment, the voltage is 220 volts. It is on this parameter that the final result of the translation depends. hamper into kilowatts.
The wrong calculation may lead to the choice of safety-guard It will not work in time, or the cable will melt under load. In this article, we will analyze the physical formulas, provide accurate calculations for different types of networks and give practical tips for choosing the components of your carβs electrics.
Physics of the process: formula for calculating power
To translate the current force into power, the basic formula of Ohm's law for the section of the DC circuit is used: P = I Γ U. Here. P - That's wattage. I - current strength in Ampere, and U - Voltage. To get the result in kilowatts, the resulting value is divided by 1000.
If we are talking about a standard car board with a voltage of 12 volts, then the calculation will look like this: 63 A Γ 12 V = 756 W or 0.756 kW. However, if the engine is started and the generator produces 14.4 V, the power will increase: 63 A Γ 14.4 V = 907.2 W. The difference of almost 20% is significant for accurate engineering calculations.
β οΈ Attention: Always consider the maximum voltage in the system (14.5β14.8 V) when calculating to ensure that components can withstand peak loads without overheating.
For AC networks, for example, when charging an electric car from a 220V home outlet, the formula is complicated by the power factor (cos Ο), but for active load (heaters, lamps), it can be taken as 1. In this case, 63 A at 220 V will give a whopping 13.86 kW, which is already the power level of the whole. line Or a powerful charging station.
Calculation for the car network 12 volts
Automotive electrics are low-voltage systems with high currents. The value of 63 amperes in the context of a 12-volt network is quite significant. This current strength is characteristic of powerful energy consumers who require a serious approach to installation.
Most often, the current in 63A is consumed by:
- π₯ Powerful Class D amplifiers for subwoofers.
- π Electric winches at the moment of traction.
- βοΈ Compressors of autonomous air conditioners.
- π High-power chargers.
At 12 volts, the power is less than 1 kW, but the current is high. This means that the main problem is not so much the generation of energy as its transmission through wires. A thin wire at 63A will instantly turn into a heating element, which can lead to fire.
It is important to take into account the voltage drop on long wiring sections. If you pull the cable from the battery into the trunk to the amplifier, and 1 volt falls on the wire, then the power loss will be 63 watts, which will go solely to heat the insulation. Therefore, cables with a cross section of at least 16-25 mm2 (copper) are used for such currents.
βοΈ Chain check at 60+ Amps
Comparison with 220 Volts home network
The situation changes dramatically if we consider the household network of alternating current with a voltage of 220 volts. Here, the same 63 amps give a completely different power scale. The calculation is simple: 63 A Γ 220 V = 13,860 W or 13.86 kW.
This value corresponds to the total capacity of several apartments or very powerful industrial equipment. In everyday life, such currents are rare: a standard outlet is designed for 16A (3.5 kW), and the introductory machine to a private house is often put on 25-40A. Current 63A in the home network is a powerful level electric-plate Or charging an electric car.
| Parameter | Car (12V) | Car with running internal combustion engine (14.4V) | Household network (220V) |
|---|---|---|---|
| Current power | 63 A | 63 A | 63 A |
| Power (W) | 756 W. | 907 W | 13,860 W |
| Power (kW) | 0.76 kW | 0.91 kW | 13.86 kW |
| Typical application | Power, winch. | Generator, starter | Charging EV, boiler |
The difference of 15-18 times power at the same current strength explains why wires in electric vehicles with fast charging can be thinner than in the on-board network 12V when transferring similar power (although there are nuances with high voltage traction battery).
Selection of safety lock and chain protection
If your calculation showed a consumption of 63 amps, this does not mean that you need to put the fuse exactly on 63A. The fuses have inertia and can withstand short-term overloads. However, for a constant load, the rule states: the nominal value of the fuse should be 10-20% higher than the operating current, but below the maximum throughput capacity of the wire.
The standard range of car fuses includes values: 40A, 50A, 60A, 70A, 80A. The value of 63A is non-standard for conventional inserts, so most often choose the nearest larger standard denomination - 70A or 80A, or use automatic thermal fuses with precise settings.
β οΈ Warning: Never use a wire or wire instead of a fuse. At 63A, sparking at the site of poor contact can melt the plastic in seconds.
When installing powerful equipment, such as an amplifier consuming 63A, it is recommended to break the load or use special ANL or MIDI fused inserts. They have better heat transfer and reliability at high currents compared to standard knife fuses.
What happens if you put a fuse of lower denomination?
If you put the fuse on 50A at real consumption of 63A, it will constantly burn out. But worse is another: it can burn not instantly, but start to warm, melting the fuse body and the contacts of the pad, which will lead to a fire in the wiring.
Effects of Temperature and Length of Wiring
When the current flows in 63 amperes, the wires are heated. The degree of heating depends on the cross-section of the vein, the material (copper or aluminum) and the conditions of the gasket. In the car, wires are often in harnesses, under carpets or in the engine compartment, where the temperature is already high.
The length of the cable plays a critical role. The longer the wire, the greater its resistance. The formula of resistance: R = (Ο Γ L) / S, where Ο is the resistivity of copper, L is the length, S is the cross-sectional area. At 63A, even a small resistance of 0.05 ohms would give a voltage drop of 3.15 volts and generate almost 200 watts of heat. This is a loss of efficiency and the risk of fire.
For currents of the order of 60-70 amperes, the minimum permissible cross-section of a copper wire is 16 mm2 (about 4 AWG according to the American standard) for short sections up to 1 meter. If the length of the route is 3-5 meters, the section should be increased to 25 mm2 (2 AWG) or even 35 mm2 to minimize losses.
Use only copper multicore wires with silicone insulation. Aluminum for such currents in the car is not suitable due to oxidation and brittleness, and PVC insulation can flow when heated.
Practical examples of equipment
Consider real-world devices that can consume around 63 amps. This will help you better understand the numbers.
The first example is winch. At the time of maximum effort (for example, when you pull a stuck jeep), the winch can briefly consume up to 300-400 amps, but in the normal winding mode under load, the current is just 50-70 amps. That is why the wires on the winches always go as thick as possible.
The second example is the audio system. A powerful monoblock that rocks the subwoofer by 1000-1200 W (taking into account the efficiency of class D about 80-85%), will consume from the network just about 60-70 amps in peaks. For such a system, a separate wire from the battery and installation are required capacitor Or an extra battery.
The third example is the preheater of the engine (Webasto, Hydronic and analogues). Although they consume fuel, their electrical portion (candle of incandescent and pump) may produce high current at the time of ignition, but in circulation pump mode consumption is usually lower (10-15A). Current 63A for "Vebasta" - this is too much, most likely to burn the fuse.
For equipment with consumption of 63A and above, it is mandatory to lay a separate line from the battery terminal with individual protection.
Frequently Asked Questions (FAQ)
Can a standard car battery give you 63 amps?
Yeah, easy. The starting current (CCA) of a conventional battery is 400-600 amps. Current 63A is a workload for it, although prolonged operation in this mode (more than 30-40 minutes) can lead to deep discharge and shorten the battery life.
What kind of wire is needed for 63 amps?
For short-term loads (up to 5 minutes), it is permissible to use a copper wire with a section of 10 mm2. For constant operation, a wire with a cross section of at least 16 mm2 is required, and for a length of more than 3 meters it is better to take 25 mm2 to avoid a voltage drop.
Why is 63 amperes in 12 volts not enough, but 220 volts a lot?
Power is the product of current on voltage. In a 12-volt system, a huge current is required to produce high power (leading to thick wires). In a 220-volt system, the same current carries 18 times more energy, so the 63A in the socket is a very powerful load.
Will the wiring burn if you connect 63A through the standard fuse 10A?
The 10A fuse will burn almost instantly (in a split second), as the overload will be 630%. This will protect the wiring, but it will de-energize the device. If you replace the fuse with a more powerful one without replacing the wiring, the wiring itself will burn.