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Guide

What size DC-DC charger for 200 Ah of lithium?

Any DC-DC charger whose rated output is at or below the bank's published max charge current; use it per the maker's instructions. Two LiTime 12V 100Ah LiFePO4 batteries accept 200 A, so all 3 chargers we list pass; a 40 A charger refills the 2,048 Wh usable in about 3.6 hours of driving calculated. Data updated .

200 Ah banks against each charger

BankMax chargeREDARC BCDC1240D Dual Input 40A (40 A)Renogy 12V 40A DC-DC Battery Charger (RBC40D1U-G2) (40 A)Victron Energy Orion XS 12/12-50A (50 A)
2 × LiTime 12V 100Ah LiFePO4200 AWorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.
2 × Epoch 12V 100Ah Group 24200 AWorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.
2 × Redodo 12V 100Ah Ultra Mini Bluetooth (Group 22NF)200 AWorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.
1 × Redodo 12V 200Ah Plus200 AWorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.
2 × Battle Born BB10012 100Ah 12Vmaker states no parallel count100 AWorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.WorksThe DC-DC charger's rated output is within the bank's published max charge current.

Max charge = the maker's per-battery figure × batteries in parallel calculated. Drive hours = usable Wh ÷ (charger amps × 14.2 V), before charger losses calculated.

Bigger isn't always possible

A charger's output is limited by what the vehicle side can supply; we don't size alternators or cabling. The charger maker's manual sets the install; see alternator charging and safety.

Sources