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traditional alternator - starter battery voltage drops from 14.5 to 13.1 volts when renogy 50S dc mppt charger is connected

Solved! Victron Orion standalone DC DC charger solved the problem


Glad to hear it.

I assume we're talking about a 30A Orion. During the ordeal did you ever happen to try limiting the DCC50 or 1250D to ≤30A? Maybe 50A was too much and 30A acceptable?
 
I have a 110A alt on my 2020 express 2500. It does good with my 12-24/15A Victron charger. It pulls about 34A at max output. I installed a hall sensor at alt output, then used high temperature epoxy to hold thermistor to top rear housing. I keep output under 83A or 75%. I keep temp below 90C.
 
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Glad to hear it.

I assume we're talking about a 30A Orion. During the ordeal did you ever happen to try limiting the DCC50 or 1250D to ≤30A? Maybe 50A was too much and 30A acceptable?
Neither the DCC50 or 1250D has settings to manually modify the amperage.

The DCC50 does limit alternator charging to 25A when solar is connected, but charging from alternator still only pulls 0.24 amps, which means it is really not charging from the alternator.
 
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Neither the DCC50 or 1250D has settings to manually modify the amperage.

In the app (DC Home?) the DCC50 output current can be set in either 5A or 10A increments, don't remember which. It's been a while since I played with one.

Update: it's 10A-50A in 10A steps; see this post. I assume the DCC30 allows 10-30A.
 
In the app (DC Home?) the DCC50 output current can be set in either 5A or 10A increments, don't remember which. It's been a while since I played with one.

Update: it's 10A-50A in 10A steps; see this post. I assume the DCC30 allows 10-30A.
Sorry you're right- I did go all the way down to 10A. Still no bueno.
 
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