Lithium battery charging in FW of truck
Can someone please explain. 2015 F350 alternator 200-220A, wire to rear of truck not clear on gage but about 20’, wire from plug to FW batteries 15’ or more supposedly protected by 30A fuse. I se peop...
Forum Discussion
With solar at say 14.5v and alternator charging at say 14.1, you will not get the total amps. You will get all the solar amps, but only some of what the alternator amps would be by themselves without the solar.
These are not real numbers, but just examples: Solar alone 20 amps, alt alone 10 amps, together 25 amps.
A DC-DC can be set to the same voltage as the solar, so they would add their amps for the total of what each could do by itself.
This does not answer the OP's question re the LFP draw with just the 7-pin, but he did say he wants to have both solar and alt charging. So you get more amps with the DC-DC, plus it isolates the LFP house batts from the alternator/starting batt, which solves that too.
If the OP does not want a DC-DC, then knowing his 7-pin amps (already lame) will be even less with the solar on, he might as well pull that 7-pin 12v fuse and just use the solar. Solves any LFP draw issue if there really is one.
Need to resolve is what amps the alternator can run continuously, and what wiring/fuse is needed. Mex seems to say the OP's alternator can't take even the 1/3 amps like PT said. That needs to be cleared up.
These are not real numbers, but just examples: Solar alone 20 amps, alt alone 10 amps, together 25 amps.
A DC-DC can be set to the same voltage as the solar, so they would add their amps for the total of what each could do by itself.
This does not answer the OP's question re the LFP draw with just the 7-pin, but he did say he wants to have both solar and alt charging. So you get more amps with the DC-DC, plus it isolates the LFP house batts from the alternator/starting batt, which solves that too.
If the OP does not want a DC-DC, then knowing his 7-pin amps (already lame) will be even less with the solar on, he might as well pull that 7-pin 12v fuse and just use the solar. Solves any LFP draw issue if there really is one.
Need to resolve is what amps the alternator can run continuously, and what wiring/fuse is needed. Mex seems to say the OP's alternator can't take even the 1/3 amps like PT said. That needs to be cleared up.
