Lithium battery charging in FW of truck

BFL13 That is the one, yes I was aware of the 25V max on solar but frizzing weather is not usual around here, we are heading north to avoid it. Will report on how it is going after a bit of use, at the moment I have everything shut of as my new lithium batteries are at 96%.
Frank.

The solar part of that charger only has 25V (Voc at 25C) limit, so can only be used with 12v panels in parallel and when not so cold that Voc gets too high.

OP has 150w 12v panels with 22.5v Voc, so it can work that way if not too cold.

Otherwise, the solar part of the charger could be by-passed using another controller going direct to battery and they could add their amps if set to the same voltage.

Perhaps it might be advantageous to split the solar array (OP has four 150w) so some goes to the Renogy at 12v and some goes to its own 24v controller with that part of the array in series.

It says the solar can maintain the engine battery if the house batts are full, but also says the DC-DC isolates the engine batt from the house batts. I haven't got to where it explains (if it does) how that can be.

"NEVER connect the solar panel to the charger without a service battery connection. The Battery must be connected first"

Assume you got one of these. Was not aware of this product. Interesting!

https://ca.renogy.com/renogy-50a-dc-dc-on-board-battery-charger-with-mppt/

Please share any "lessons learned" from the trip.

Finished installation of new dc dc MPPT solar charger, so far so good, not much sun but rain at the moment but the dc dc supplied the 25A ok when I connected to truck, If I turn of the solar shut get the full 50A. So happy so far. Going on a 3 month trip in a week so will get a work out then.
Frank.

Confusing. If that is a solar controller, it is buck only, while the actual DC-DC charger is buck/boost, which maintains the output voltage no matter what the input voltage is.

I today ordered a Renogy 50A dc dc MPPT charger, which I will connect to the 00 cable on rear of truck with 4 avg to charger, hopefully filling 2 golds with one.
Frank.

Frank,

Start an email with the makers to get the information you need?

That may be a problem Mexicowanderer, I am in Australia and dealer in America. Today I attached truck to FW truck charging at it usually 14.1 14.2V batteries in FW At 91% according to the TM, 9%of 300A = 27A used, put my clamp on at charge wire in FW and only showing 2.5A going in . I will check again when batteries are discharged further and be careful, while residing whether to get a dc to dc charger.
Thanks everyone for contributing.
Frank.

Go to your new vehicle dealer
Seek Technical Service Bulletins regarding the factory interfacing of the alternators versus the ECU computer. You want to avoid accidental coding of charging system errors due to auxiliary battery charging errors.

Voltage drop goes with the amps. More amps , more drop. 7-pin is low amps so not much drop. The lower voltage comes when the alternator regulator reduces its voltage once the starting batt is recharged.

IMO wait for more info to decide what to do if you still want any alternator charging, as there is conflicting advice on that.