Calling out Frenchy and his Variable Voltage Post

[ctechbob]

I believe that it may be a Hall effect current sensor, or some type of magnetic field current sensor. A shunt capable of handling that amount of current would be very large.

Quite possible. I'm not tearing mine apart to find out.

Although, there wouldn't ever be heavy current going through there, or shouldn't be, at least not on a constant basis.

Good point though. My 500 amp shunt in my trailer certainly isn't small.

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[dtech]

I am so glad I disconnected the bms yrs back, don't worry about clamps, shunts, draws, nocturnal discharges and so on. Peace

 

[RangerBill]

Quite possible. I'm not tearing mine apart to find out.

Although, there wouldn't ever be heavy current going through there, or shouldn't be, at least not on a constant basis.

Good point though. My 500 amp shunt in my trailer certainly isn't small.

The sensor has to be able to handle the starter current draw when starting the truck.

 

[ctechbob]

The sensor has to be able to handle the starter current draw when starting the truck.

True, but that number probably isn't as high as most people think. The initial spike, yes, but the continued draw, not much. But I think you're probably still right, it is probably inductive.

I think a lot of folks get drawn in by battery CCA and think that's what starters pull. It really isn't that much in the long run.

I have a perfect example. My travel trailer, the Victron 3000VA inverter in it is capable of pulling wellllll over 230 amps continuous, and I have the battery bank that can do it. What I don't have is the wire that can. Even though everything is wired with nice OFC real copper 1/0 I can still melt the insulation off it if I let it run like that for a while. (Maybe a bit exaggerated, but not much.)*

Even at 100amp draw the wire gets noticeably warm. And I'm not talking miles of wire. From inverter to battery is about 3 feet.

The starters in our trucks don't pull near that through what looks like 6awg cable tops. At least not on a continuous basis.

*Yes, now the the system is done wiring upgrades are on the list. It is just what I had on hand without spending a pile of money on new cable.

 

[ctechbob]

I am so glad I disconnected the bms yrs back, don't worry about clamps, shunts, draws, nocturnal discharges and so on. Peace

Yea, I've left mine on, but set the % in Forscan to 95% and have ASS disabled.

 

[Msfitoy]

I am so glad I disconnected the bms yrs back, don't worry about clamps, shunts, draws, nocturnal discharges and so on. Peace

You vasectomized your truck?

 

[RangerBill]

True, but that number probably isn't as high as most people think. The initial spike, yes, but the continued draw, not much. But I think you're probably still right, it is probably inductive.

I think a lot of folks get drawn in by battery CCA and think that's what starters pull. It really isn't that much in the long run.

I have a perfect example. My travel trailer, the Victron 3000VA inverter in it is capable of pulling wellllll over 230 amps continuous, and I have the battery bank that can do it. What I don't have is the wire that can. Even though everything is wired with nice OFC real copper 1/0 I can still melt the insulation off it if I let it run like that for a while. (Maybe a bit exaggerated, but not much.)

Even at 100amp draw the wire gets noticeably warm. And I'm not talking miles of wire. From inverter to battery is about 3 feet.

The starters in our trucks don't pull near that through what looks like 6awg cable tops. At least not on a continuous basis.

The specs in the shop manual state:


General Specifications

Item	Specification
Normal engine cranking speed (Average)	200-250 RPM
Starting circuit maximum voltage drop (Engine at normal operating temperature) (Average)	0.5 volt
Starter motor maximum load current draw	800 amps
Starter motor no-load current draw (Average)	60-80 amps
Starter motor normal load current draw (Average)	130-190 amps

Could be up to 800 amps with 130-190 amps average.

 

[ctechbob]

The specs in the shop manual state:


General Specifications

Item	Specification
Normal engine cranking speed (Average)	200-250 RPM
Starting circuit maximum voltage drop (Engine at normal operating temperature) (Average)	0.5 volt
Starter motor maximum load current draw	800 amps
Starter motor no-load current draw (Average)	60-80 amps
Starter motor normal load current draw (Average)	130-190 amps

Could be up to 800 amps with 130-190 amps average.

Surprised they don't note a time limit on that. Those wires coming off the battery would melt at that draw long before the battery gives up.

 

[Cabose-1]

Okay i am going to ask it!! Cant help myself!!


If my wife uses the hair straightener plugged into the truck, will it still power my ebrake?? What if i use my c to c charger plugged into the cigarette lighter, how does that affect m dome lights?

2022 xlt fx2 with tailgate assist mod

 

[ctechbob]

Okay i am going to ask it!! Cant help myself!!


If my wife uses the hair straightener plugged into the truck, will it still power my ebrake?? What if i use my c to c charger plugged into the cigarette lighter, how does that affect m dome lights?

2022 xlt fx2 with tailgate assist mod

As long as you don't bypass the turbo encabulator you'll be fine.

 

[got3fords]

Surprised they don't note a time limit on that. Those wires coming off the battery would melt at that draw long before the battery gives up.

Reminds me of the time we were afloat on my buddy's boat on a huge lake in Ohio. We were all drinking of course. The boat didn't want to start. My buddy hit the key and let the starter crank so long the battery terminals melted. (dumbass!) After attempting to fix the cause of why it wouldn't start, we were at a loss how to get battery power to the starter. I suggested holding the cables by hand against the what was left of the terminals. Everyone was scared to death about getting shocked, so I stepped up, held the cables by hand, positive in one hand negative in the other, and said hit it. Motor fired up, we were on our way, I was a hero. Current follows the path of least resistance. Same reason squirrels don't get fried when running down a power line.

 

[RedDakooter05]

Lots of users here have ignored me over the dumbest of reasons. Funny for how much texans(which make up the majority of the users ignoring me)talk about libtards being pansies, they sure are quick to put someone on ignore.

Even though I've never stated my political beliefs.





Anyway I have nothing to contribute as this problem doesn't pertain to me and @Frenchy so far hasn't ignored me so guess hes tolerating me.

Edit: oh, thought Frenchy was from Texas not Colorado, my bad.

 

[NotBudule2]

Surprised they don't note a time limit on that. Those wires coming off the battery would melt at that draw long before the battery gives up.

Yea, I've left mine on, but set the % in Forscan to 95% and have ASS disabled.

Why not set to 100% ? Or is that not an option ? I forgot to even look at that when I went in and changed my lights to Bambi mode ...

 

[ctechbob]

Why not set to 100% ? Or is that not an option ? I forgot to even look at that when I went in and changed my lights to Bambi mode ...

Umm, Honestly I don't remember why I didn't. I probably had some reason rattling around up in my giant gourd at the time, but 4 years on, no clue. Not saying you shouldn't just I don't remember why I didn't.

 

[ctechbob]

Reminds me of the time we were afloat on my buddy's boat on a huge lake in Ohio. We were all drinking of course. The boat didn't want to start. My buddy hit the key and let the starter crank so long the battery terminals melted. (dumbass!) After attempting to fix the cause of why it wouldn't start, we were at a loss how to get battery power to the starter. I suggested holding the cables by hand against the what was left of the terminals. Everyone was scared to death about getting shocked, so I stepped up, held the cables by hand, positive in one hand negative in the other, and said hit it. Motor fired up, we were on our way, I was a hero. Current follows the path of least resistance. Same reason squirrels don't get fried when running down a power line.

Well, that and your bodies resistance is so high that 12v isn't going to flow very much through you. it does, but we're talking tiny tiny amounts of current.

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