School me on the subject of dc dc charging at 12v system.

[ohv]

I am working on a 12v 300ah system in a milwaukee roller packout, diesel heater and combo refrigerator.

I see all the brands on Amazon for higher charging however if I'm just driving and have this battery that has its own mppt charger do I really need a dedicated device under the hood?

I will run a Anderson plug to the bed off 8gauge wire from the battery/fused/switched to give power where the refrigerator/battery would sit.

 

[gator70]

DC-DC charging has pros and cons. (1) add up all the costs to install one. See if that is worth the 20 amp charging. Above 20 amps, do you risk your alternator? Some folks say no, some say yes.

 

[ohv]

DC-DC charging has pros and cons. (1) add up all the costs to install one. See if that is worth the 20 amp charging. Above 20 amps, do you risk your alternator? Some folks say no, some say yes.

I do agree it's a bad idea to add the stress on the alt. I was budgeting for no more then 20amp and my main thought was keeping the dual batteries in the rig for starting power in colder times. I live in socal but spend a few weeks in Yosemite and Kings during the wintertime.

 

[gator70]

I do agree it's a bad idea to add the stress on the alt. I was budgeting for no more then 20amp and my main thought was keeping the dual batteries in the rig for starting power in older times. I live in socal but spend a few weeks in Yosemite and Kings during the winter time.

Based on your response - lists the parts and cost

 

[DirtWhiskey]

Stress on your alternator? Upgrade your alternator. There are no cons. Do it. Before solar.

 

[rruff]

Stress on your alternator? Upgrade your alternator. There are no cons. Do it. Before solar.

If your alternator is easy to replace, I'd agree... but some are very difficult to get to and replace... $$$.

Beside that, you do pay the fuel to run it. And if you idle your rig to charge, then it's very inefficient and hard on your engine as well.