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03-22-2021, 09:18 PM #31
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Brian & Shea+ Zeke & Roxy GSP’s
2018 GD Reflection 303RLS 800w solar 400ah LiFePO4
Sold 2018 Ford F-250 CCSB Lariat gas 2,980# payload
2024 Ford F-350 4x4 CCSB Lariat diesel 4,000# payload
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04-29-2021, 12:52 PM #32
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Even with larger cables you still need a higher than lead-acid voltage to effectively charge Lithium. Larger wires might lessen the voltage drop, but it will not take much to drop below lithium's needs. The DC/DC works well, and I did not have to putz around with crawling around underneath the truck.
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06-02-2021, 01:22 PM #33
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A little more data here ..
I have an AiLi current meter/battery monitor between my 2 DC27 batteries and the RV ground. I left the power on for the last couple days while hooked to the truck.
The combination of the refrigerator, powered antenna, WiFi equipment, and whatever else is on with the main power switch was drawing about 2.2-2.6A. Predictably, this drew my batteries down to about 11.7V (30%)
My point in doing this was to find out how my F-450 charges the batteries. After getting the batteries to this low state, I started the truck and watched the ammeter.
Right after starting the truck, there was no current going in, so no charge. As others have mentioned, to enable power to the trailer, you need to push the brake pedal. That does start the charge, but creating a "door event" (opening or closing) will stop the charge. The driver's door will stop it immediately, the passenger (and other?) door will stop it when the "door ajar" alarm comes up on the dash.
So, to charge the battery from the truck ..
- I left the motor running & trans in park (of course)
- Rolled down the driver's window
- Got out and closed all of the doors
- Put the key on the driver's seat (so I didn't get a "key not detected" error)
- Pushed the brake pedal with a long stick
As long as the truck was running, the batteries were charging. I measured a peak of 12A which slowly decreased to 11A then 10A after a few minutes. I'm pretty confident that the batteries would eventually go to full charge after a couple of hours driving or so.signature
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06-02-2021, 03:16 PM #34
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J,
Thanks for the detailed update on the Ford charging system to the trailer. Unless I am mistaken those batteries are rated about 80 ah each for the 20 hour rating. If you are at 50% state of charge for 2 batteries you are down 80 amp hours that needs to be put back in the batteries. My guess is that will be quite a bit more than 8 hours of driving to recharge the batteries close to full as the charge current gradually reduces as the battery approaches 100% for lead acid batteries.
BrianBrian & Shea+ Zeke & Roxy GSP’s
2018 GD Reflection 303RLS 800w solar 400ah LiFePO4
Sold 2018 Ford F-250 CCSB Lariat gas 2,980# payload
2024 Ford F-350 4x4 CCSB Lariat diesel 4,000# payload
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06-02-2021, 07:31 PM #35
Charging Lithium Batteries From...
Today, 12:46 PM in Electrical System and Wiring