Jumper cable amp rating

[alfonsomiguel]

Sirs, ask ko lang. Critical ba yung amp rating ng mga battery booster cables? Sa 2.0Li na engine ano dapat rating?

TIA.

[ghosthunter]

Sirs, ask ko lang. Critical ba yung amp rating ng mga battery booster cables? Sa 2.0Li na engine ano dapat rating?

TIA.

In my experience, YES. Lower AMP rated cables simply cannot carry enough current to crank-over the stalled car and just end up getting hot and may even melt through their insulation. But it does not really matter if the car is a 1.3 or 2.0L ....

[alfonsomiguel]

Thanks alot Sir.

[jick.cejoco]

Most commercial jumper cables are 4 American wire gauge size do automotive use and will suffice for a 1.3 liter gas engine

[vinj]

So what's the ideal AMP rating to buy at the least?

[ghosthunter]

So what's the ideal AMP rating to buy at the least?

Maybe 400 or 500 amp cables....

Also aside from the wires, check the quality of the clamps.

[alexverzosa]

Strictly speaking, it is a series connection because only a single load(car to be jumped) is connected to the single source(battery). Electron flow during jump start only occurs in a single loop. Yes, the batteries will be connected in parallel(source to source) but the car would be in series with the battery(or batteries in parallel).

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[Retz]

^

ah okay. un pala ang explanation kung bakit series.

[12vdc]

^ Wrong

If you series the batteries it will produce 24 volts.

[alexverzosa]

^ Wrong

If you series the batteries it will produce 24 volts.

Yes, the batteries are in parallel during jump start (+ to + and - to -). The series connection refers to the connection of the starter(load) and battery(source).

While this is the case, I am not certain if this is why some call this a series connection. Maybe nakasanayan na lang din.

Regarding jump start procedure, wouldn't it be safer to connect negative first? I believe the body is connected to ground(negative terminal of battery). If one were to connect the positive terminals first and somehow touch both car bodies without insulation the person would complete the circuit, possibly causing the current to pass through the person. As opposed to when we connect negative to negative first, where there is very little chance of accidentally connecting the positive terminals because of the relatively lesser exposed metal connected to them. Of course, this is based purely on electrical theory and I'm very open to correction. Wisest would be to follow what is stated in the user manual of your vehicle.

As for jumper cable current rating, I'd go for at least double what your starter is rated.

[confused shoes]

Yes, the batteries are in parallel during jump start (+ to + and - to -). The series connection refers to the connection of the starter(load) and battery(source).

While this is the case, I am not certain if this is why some call this a series connection. Maybe nakasanayan na lang din.

Regarding jump start procedure, wouldn't it be safer to connect negative first? I believe the body is connected to ground(negative terminal of battery). If one were to connect the positive terminals first and somehow touch both car bodies without insulation the person would complete the circuit, possibly causing the current to pass through the person. As opposed to when we connect negative to negative first, where there is very little chance of accidentally connecting the positive terminals because of the relatively lesser exposed metal connected to them. Of course, this is based purely on electrical theory and I'm very open to correction. Wisest would be to follow what is stated in the user manual of your vehicle.

As for jumper cable current rating, I'd go for at least double what your starter is rated.

Correct.
During jumpstart, you are not connecting two batteries but a load so you can not say it is "parallel".

[12vdc]

Yes, the batteries are in parallel during jump start (+ to + and - to -). The series connection refers to the connection of the starter(load) and battery(source).

While this is the case, I am not certain if this is why some call this a series connection. Maybe nakasanayan na lang din.

Regarding jump start procedure, wouldn't it be safer to connect negative first? I believe the body is connected to ground(negative terminal of battery). If one were to connect the positive terminals first and somehow touch both car bodies without insulation the person would complete the circuit, possibly causing the current to pass through the person. As opposed to when we connect negative to negative first, where there is very little chance of accidentally connecting the positive terminals because of the relatively lesser exposed metal connected to them. Of course, this is based purely on electrical theory and I'm very open to correction. Wisest would be to follow what is stated in the user manual of your vehicle.

As for jumper cable current rating, I'd go for at least double what your starter is rated.

Maybe the term was coined from early training on basic electricity like how to connect a light bulb of a flashlight using 2pcs size D batteries in series. Even if you put the starter (load) to the battery (source) it will still be in parallel.

For DC system, positive first for safety. Chassis having the larger surface area(surroundings) is electrically negative. For AC system esp unbalanced transmission, lage grounding at neutral side ang una for safety.

When buying jumper cable, inspect the quality of wires and how good the clamps and the crimping. The finer/heavier the strands on the same wire gauge means it could carry much current than those having larger strands.. Those in the market mostly are overrated so id suggest get the highest rating as possible just to be sure. Another is, during jump starting if you are unsure how good the car's chassis ground, id suggest clamp it directly to the negative terminal. I tried jump-starting L300 using Gauge 12 3C royal cord bolting it directly to the clamps. Considering diesel takes time to heat the heater and have larger starter motor, i would assume even a 150Amps cable would do the job for a gas engine.

[dr. d]

[QUOTE=alexverzosa;2179839]Yes, the batteries are in parallel during jump start (+ to + and - to -). The series connection refers to the connection of the starter(load) and battery(source).

While this is the case, I am not certain if this is why some call this a series connection. Maybe nakasanayan na lang din.

because they did not know any better..?
besides, it is easier to say series than it is to say parallel..

[alexverzosa]

OT na hehe

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[Retz]

Prove first that the battery is a resistive load. kung hindi, parallel connection yan.

[confused shoes]

Prove first that the battery is a resistive load. kung hindi, parallel connection yan.

Opps, balik tayo sa Physics 101.

Parallel batteries:
I(total)= I(batt1) + I(batt2)


In the case of a jump start:
I(total) = I(batt1) - I(batt2)

Where batt2 is the dead/low battery.

[12vdc]

Haha.. pinag debatehan pa talaga ang series o parallel

In Series, the current throughout each components is the same

While in Parallel, the Voltage is the same across all components be a load or a second battery.

As for the battery in parallel, it will equalize kung medyo mahina yung isa.


Kung AC circuits yan dyan kayo mag debate. The battery will now consist of capacitor resistor and inductor (battery impedance), while the starter will be purely inductive.

[Retz]

^

Sir, question lang. Pag ba sinabing dead battery as in zero(0) ang voltage reading nyan?

[confused shoes]

^

Sir, question lang. Pag ba sinabing dead battery as in zero(0) ang voltage reading nyan?

A battery (in our case a re-chargeable battery) is considered dead when it will no longer accept charge but its voltage is not necessarily zero.

[boytsiks]

^

Sir, question lang. Pag ba sinabing dead battery as in zero(0) ang voltage reading nyan?

AFAIK, dead batteries doesnt mean zero volts. It just means that battery is below specs (capacity). For example, 12Vdc yung battery pag 10 Vdc na lang ang sinsupply nya consider dead yan IMO. Unless icharge mo of course.