If it is a small-capacity battery, you can consider charging it with a cigarette lighter, such as a battery with only a few capacities. However, the capacity is too small to supply power to the car refrigerator for a long time, for example, it can only supply power for 1-2 hours, so there is no significance of modification. Therefore, to install the secondary battery, you must get electricity from the engine compartment. Can the national standard 10- 16mm be selected as the power cord? The outer surface of multi-core flexible copper wire is protected with a sheath tube and introduced into the car from the firewall of the engine room. The wires can be hidden under the ground glue, and the wires should not be rubbed by the outside as far as possible to avoid damaging the wires. The power cord in the engine room can be directly connected with the positive and negative poles of the battery stack, but it is best to install a "double battery isolator". Physical isolation is performed between the two batteries.
Theoretically, two batteries can be used directly in parallel, but when two batteries are used directly in parallel, it is more troublesome to switch the batteries manually. For example, at the beginning of vehicle startup, the battery voltage is relatively low, and two batteries in parallel are equivalent to a large-capacity battery. At this time, the charging current is particularly large. The generator not only provides working voltage for the vehicle, but also provides large current to charge the battery. The generator is easy to overload at the initial stage, the line current is too large, and the drive belt is also easy to slip. Therefore, in manual control, the secondary battery cannot be connected in parallel with the original battery immediately after the vehicle is started, and the secondary battery can only be put into operation after the charging current drops for a few minutes. After the second battery is connected in parallel with the first battery, the generator starts to charge the second battery. The same is true after the vehicle is turned off. It is necessary to disconnect two batteries and use the auxiliary battery to supply power to the refrigerator (other loads).
Manual switching is very troublesome! So it is necessary to install isolators. After installing the isolator, you can make full use of the remaining battery of the original car. After the vehicle is turned off, the original vehicle battery will not be disconnected from the auxiliary battery immediately, but when the voltage drops to12.5v. This can release more electricity, not only increase the output power, but also increase the discharge degree. If the battery is lower than 12.5V, it is slightly dangerous and the vehicle may not start. When the voltage of the main battery drops to 12.5V, the auxiliary battery supplies power to the load (refrigerator) alone. If the refrigerator has no undervoltage protection function, the secondary battery can be emptied. After installing the isolator, there is no need to manually control the charging of the battery. For example, the isolator will monitor the main battery voltage, and when the voltage rises to 13.5V, its charging current will be greatly reduced. At this time, the auxiliary battery and the main battery are connected in parallel, which is equivalent to peak charging, and the generator will not be overloaded.
Hello. All modifications involving the drive circuit are advised to be cautious and not to be changed unless absolutely necessary. In fact, your needs can be realized in any car without disconnecting the line and changing the circuit.
What you said about go on road trip and camping, I also met your needs. To achieve the goal clearly, in fact, in three aspects, the first is to supply power to the car refrigerator, the second is to convert and output 220v AC; The third is that you can charge yourself while driving.
1. None of the inverters on the market are as expensive as 100, so there are hundreds. But when choosing, you need to pay attention to a message, whether the converted output is a positive sine wave or an analog sine wave. There is little difference between the short-term use of electrical appliances, but it is recommended to choose positive sine wave.
2. During the voltage conversion of the frequency converter, the equipment will generate heat, some will only dissipate heat through the metal sheet, and some will have a cooling motor, which will be safer with air cooling.
3. In fact, you directly search for outdoor power supply, and there are specialized manufacturers to produce such products. There are AC and 12V charging methods. You only need to buy a 12V charger, and connect it to the cigarette lighter socket in your trunk to charge the power supply. The outdoor power supply has its own cigarette lighting interface output, which can supply power to your car refrigerator through an external power supply. With inverter conversion function, the price is around 1300-2200. The advantage is that it can be used immediately, and there is no need to modify the car battery. The manufacturer's warranty can also avoid the safety risk of self-modification. The disadvantage is that it is expensive. But I bought a copy for your reference.
As consumer goods, there are more and more cars, and the high-tech and electrified configuration is getting higher and higher.
For safety reasons, it is not recommended to change the original wiring. If there is an accident or a car spontaneously ignites, people will be threatened, and insurance companies and car manufacturers will not give you warranty.
If you really want to go out for a long trip to road trip, the original batteries of off-road vehicles and cars are relatively small, and the power is limited. If you choose induction cookers, rice cookers and electric kettles, plus the lighting of the car itself, you will consume electricity quickly and won't run far. People often choose cassette ovens, gasoline ovens, kerosene ovens and micro liquefied gas to cook food. Generally, the interior space of large professional RV is relatively large, including kitchen, bed, sofa, bathroom, lockers, high-energy power supply, and some are equipped with small generators. These are all brought by manufacturers, so don't worry about safety. Many of them are equipped with charging external devices. Provide lighting and cooking for outings.
Not everyone can afford an RV, car or off-road vehicle. Can carry 60 volt camel, sail battery, converter, or large-capacity mobile power supply.
It's a good idea that you want to connect an external battery to the car. Just refitted the lithium iron phosphate battery for the RV and bought a 2000-watt power frequency inverter. The lithium battery is second-hand, 48 volts and 50 amps. When you buy it, take it apart and convert it into 12 volts and 200 amps. Charging must be connected in parallel with the car starting battery, with a large current switch in the middle. If you need to charge the lithium battery, you can turn on the switch manually. Of course, you can also install a battery disconnector, which is automatic. Usually, after the starting battery is fully charged, it will automatically turn on to charge the auxiliary battery. You'd better buy a suitable lead-acid battery, which is easy to refit. Note that the connecting wire must be made of 25 square copper wire, and the thin wire is easy to catch fire.
First of all, I agree with your hands-on ability. Most people think that it is enough to connect a secondary battery in parallel, but it is really not a good idea, but there are some principles for series and parallel connection of batteries, that is, the capacity is the same, the internal resistance is the same, and the voltage is the same. Especially when the new and old batteries are used in parallel, the internal resistance of the new battery will generally be less than that of the old battery, and the old battery will accelerate aging. Therefore, if spare batteries are to be installed, the old batteries should be replaced in time, and new batteries will be used unless isolation is adopted. For laymen, there are other risks at present if the wiring is too thin.
There is really no better way to equip batteries. It is recommended to prepare an outdoor power supply.
A 12v battery and a diode will do.
No inverter, full DC scheme, high energy utilization rate, low cost, increased battery life, patented technology product authorization. Air-conditioned refrigerator, rice cooker and electric stove are convenient for cooking.