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Alternator charging through a DC-DC charger

To charge a lithium house battery from the vehicle alternator, use a DC-DC charger per the maker's instructions. Our check is narrower: is the charger's rated output at or below the battery bank's published max charge current? We apply it to 3 DC-DC chargers and 12 batteries calculated. Data updated .

How the check works

Rated output amps ≤ bank max charge current (per-battery figure × batteries in parallel): works; above it: no; either figure unpublished: not published. For energy, the planner counts output amps × 14.2 V × hours driven calculated.

We don't assess alternators, cables, fuses or installation. Those follow the charger maker's manual; see safety.

Battle Born BB10012 100Ah 12V

One Battle Born BB10012 100Ah 12V
ModelCharge current
REDARC BCDC1240D Dual Input 40AWorksThe DC-DC charger's rated output is within the bank's published max charge current.
Renogy 12V 40A DC-DC Battery Charger (RBC40D1U-G2)WorksThe DC-DC charger's rated output is within the bank's published max charge current.
Victron Energy Orion XS 12/12-50AWorksThe DC-DC charger's rated output is within the bank's published max charge current.

Battle Born BB10012H 100Ah 12V Heated

One Battle Born BB10012H 100Ah 12V Heated
ModelCharge current
REDARC BCDC1240D Dual Input 40AWorksThe DC-DC charger's rated output is within the bank's published max charge current.
Renogy 12V 40A DC-DC Battery Charger (RBC40D1U-G2)WorksThe DC-DC charger's rated output is within the bank's published max charge current.
Victron Energy Orion XS 12/12-50AWorksThe DC-DC charger's rated output is within the bank's published max charge current.

Epoch 12V 100Ah Group 24

One Epoch 12V 100Ah Group 24
ModelCharge current
REDARC BCDC1240D Dual Input 40AWorksThe DC-DC charger's rated output is within the bank's published max charge current.
Renogy 12V 40A DC-DC Battery Charger (RBC40D1U-G2)WorksThe DC-DC charger's rated output is within the bank's published max charge current.
Victron Energy Orion XS 12/12-50AWorksThe DC-DC charger's rated output is within the bank's published max charge current.

Epoch 12V 105Ah Heated Bluetooth (Essential)

One Epoch 12V 105Ah Heated Bluetooth (Essential)
ModelCharge current
REDARC BCDC1240D Dual Input 40AWorksThe DC-DC charger's rated output is within the bank's published max charge current.
Renogy 12V 40A DC-DC Battery Charger (RBC40D1U-G2)WorksThe DC-DC charger's rated output is within the bank's published max charge current.
Victron Energy Orion XS 12/12-50AWorksThe DC-DC charger's rated output is within the bank's published max charge current.

Every battery is checked on its own page: all batteries; every charger: all DC-DC chargers.

Sources