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Old 04-08-2016, 08:59 AM   #11
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Originally Posted by Mustang65 View Post
Here is what I have noticed about the charging of the TT battery by the F150 (280Amp Alternator). When the F150 starts up the charging voltage jumps to 14+ volts and as the trucks battery charges it levels off at 13 Volts and then down to 12.6VDC. When I add the TT's batteries that are 12.4VDC (minus the SOLAR charging) the trucks charging circuit does not jump to 14+ volts that would be expected. It only goes up to 12.6 or 12.7VDC. The trucks battery is a couple weeks old, decided to get a new one before we left for GA.

Based on what I see, there is a controller in the trucks wiring that doesn't care what the TT's battery voltage level is. I am thinking that there is a blocking diode in the trucks circuit, that isolates the TT's battery from the trucks circuit for protection, and it only sees the trucks battery. So, the TT's battery only gets the trucks output based on what the charging circuit is doing to the trucks battery. When I return from Chicago, I will do some testing to see what I find.


Don
Interesting findings. I built my own wireless battery monitor for the trailer, so I can watch it, inside the truck, while driving down the road. I will have to deliberately discharge my trailer batteries a bit and then check it. BTW, I have a 2015 F250.
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Old 04-08-2016, 09:30 AM   #12
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Interesting findings. I built my own wireless battery monitor for the trailer, so I can watch it, inside the truck, while driving down the road. I will have to deliberately discharge my trailer batteries a bit and then check it. BTW, I have a 2015 F250.
That would be cool to see!

As I typed my earlier response I was thinking I should have checked the voltage at the truck battery as well to see what the alternator was putting out. The truck just started though so it should have been around 14+ volts.
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Old 04-08-2016, 12:45 PM   #13
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Originally Posted by DanNJanice View Post
Interesting findings. I built my own wireless battery monitor for the trailer, so I can watch it, inside the truck, while driving down the road. I will have to deliberately discharge my trailer batteries a bit and then check it. BTW, I have a 2015 F250.
Our TT's MPPT SOLAR charge controller is plugged into the TT's wireless Wi-Fi router (on 24/78) and we can see the battery voltage on our Windows tablet that is in the truck. We switch between the Wi-Fi rear view camera (on back of the TT) and the MPPT controller while driving. The battery is usually around 12.6VDC while driving and drops to 12.4 when under the canopy at the gas station. I should have unplugged from the truck to see what the voltage was with SOLAR only. The fridge which runs on electric pulls the battery voltage down when it kicks on.

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Old 04-10-2016, 06:17 PM   #14
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That would be cool to see!

As I typed my earlier response I was thinking I should have checked the voltage at the truck battery as well to see what the alternator was putting out. The truck just started though so it should have been around 14+ volts.
I watched the charging on the trailer as I came home from camping this weekend.
When I left my campsite, the batteries were at 75% SOC. When the truck was running and connected to the trailer, I saw about 12.9V on the trailer batteries, with a charge current of about 7 Amps. After about an hour of driving the I was getting about 6 Amps and just over 13V at the trailer batteries. I think the most I have ever seen when driving is about 9 Amps charging the trailer batteries.
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