OBDLinkMX+

[Snakebitten]

So it never made it to "Normal Operating Temperature"

My commute is 23.5 miles one way. I can break 200F right before I arrive.

You are supposed to be at 205-215 before you can even check the fluid level accurately.

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[Samson16]

Recorded the AGM activity while driving. I started recording with fan step 5 and then I dropped it to 4. Notice how quickly the extra charge gets siphoned off the top of the battery string and settles down to 12.8 again.

 

[Snakebitten]

It has now been confirmed in rolling picture glory. ?

Welcome to the PID research rabbit hole, by the way. Good to have you friend.

 

[Samson16]

Is that 12.8 adjustable using FORScan? Since I’m years late to the game my thought is no lol.

 

[Samson16]

It has now been confirmed in rolling picture glory. ?

Welcome to the PID research rabbit hole, by the way. Good to have you friend.

Thanks Bruce! ?

 

[HammaMan]

Is that 12.8 adjustable using FORScan? Since I’m years late to the game my thought is no lol.

I wish, working on a new monitoring setup, will show what happens w/ the LFP which floats at 13.7 or so when in parallel w/ under hood AGM which stays at 100%. When connected to the larger one with bluetooth BMS at fan 4 its load its -40 amps and fan on 5 will jump to +65 amps. Basically in remote start, door open, or fob not in truck it's consuming the batt. Only w/ hvac 5 trick will it actually charge. That's okay, the thing will last more than a decade doing this and the truck's resting voltage never dips below 13.3 after 10 days or so.

The truck monitors the current transformer on the aux batt. Haven't found its PID yet. The only condition it will trip due to not knowing the size of the aux batt is that welcome lighting won't come on despite adequate charge / voltage being present. Sync doesn't sleep and after opening a door, welcome lighting comes back. It'd be nice to be able to change the aux batt to a larger size, but that's a very very minimal nuisance. Need to play with forscan and see if telling the truck to ignore the shunt and CT all together might change the running float voltage.

Another thing that the fan 5 trick does is allow the truck to charge a trailer battery properly. Otherwise the voltage sits so low that it just doesn't provide trailer battery charging at all, particularly with the longer wire run back to the trailer batt. Just too easy for the voltage to droop and deliver nothing a but a trickle if that. Certainly nowhere close to the 40a of the circuit.

 

[Samson16]

There's a lot for me to digest there.

What about spoofing the Main AGM voltage sensor with a high current diode in series between the BMS voltage sensor and the positive post of the battery? The diode would provide a voltage drop from .3V-1.0V depending on diode choice. Let's go with .5V as an example. The BMS voltage sensor sees 12.8V-.5V or 12.3V and keeps feeding the AGM until it reaches 12.8V. 12.8V at the BMS sensor actually means 13.3V on the battery positive post. We fool the BMS and prolong our AGM life.

 

[HammaMan]

There's a lot for me to digest there.

What about spoofing the Main AGM voltage sensor with a high current diode in series between the BMS voltage sensor and the positive post of the battery? The diode would provide a voltage drop from .3V-1.0V depending on diode choice. Let's go with .5V as an example. The BMS voltage sensor sees 12.8V-.5V or 12.3V and keeps feeding the AGM until it reaches 12.8V. 12.8V at the BMS sensor actually means 13.3V on the battery positive post. We fool the BMS and prolong our AGM life.

So basically, keeping the fan on level 5 and above

 

[Samson16]

So basically, keeping the fan on level 5 and above

Yes, but without deliberately draining the battery back down like it does now. From what I saw the DC/DC actually forces the battery to run the LV Bus, draining the AGM quickly back to 12.8. It's like battery cruise control. 12.8 is the number and the number shall remain 12.8! 12.9 is right out

 

[Samson16]

Fan 5 would be 14.4 + .5 = 14.9 on the battery in my scenario. That's pretty high, but not harmful imo for the limited duration I actually want step 5 or above.

 

[Samson16]

I'm going down the rabbit hole when my freaking truck is perfect! Arrgggh

 

[HammaMan]

Ford used to use current transformers on the under-hood but have switched to shunts. I'm going to wire up 3 10a diodes to try and buy some headroom in that it'd hide some of the incoming to create a condition where it's more willing to charge, but with the LFP in place it does nothing for me without putting the AGM back in but even then I don't drive enough to really watch it daily. EV gets the short trips as the ICE just won't heat up otherwise and I'm not keen on that. Needs to be a little cooler before I can get the ICE to fire on remote start when triggered. I really wish they'd make that an option instead of reverting to hybrid mode on remote start always. In spring and fall where temps are cool it doesn't request heat or use AC enough to drive down the HVB for a start condition. Thing will "run" for 10 minutes before ICE fires and that's not the intended command of remote start.

 

[Samson16]

I realized that after going away for work and I used the app to start the truck a few times. I initially thought I was charging the battery but in truth not necessarily lol. I may have just been draining the HVB at first and then perhaps didn’t run it long enough to make up the difference! ??‍ I should’ve just left it alone lol but couldn’t stop fiddling with it.

 

[Emmittfan22]

You surely have seen my current dashboard. It's posted ad nauseum around here.

The top half are ICE related PIDs and mirror what a lot of Ecoboost fellas would want to monitor. I've been monitoring the same pids going back several years and trucks.

The bottom half is all electrical.
Orange for High Voltage
Red for Low Voltage

Do you have your save file I could use? I like your setup.

 

[Snakebitten]

Do you have your save file I could use? I like your setup.

It's in a couple of different threads around here. Look for OBDlink in the title.

If you can't find it, later when I get home I'll post it again. My PID phone isn't with me today at the office.

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