Reference

Worked battery charger sizing examples

Battery Ah 40, 80, 100, 200, 350, and over-range cases with expected amp classes.

40 Ah → 4 A → 8 A class (lnk_class_8).

Details

Required = 40 ÷ 10 = 4 A; smallest class with rated_amps ≥ 4 is 8.

Tools

80 Ah → 8 A → 8 A class (lnk_class_8).

Details

Required = 8 A; 8 ≥ 8 → 8 A class.

Tools

100 Ah → 10 A → 20 A class (lnk_class_20).

Details

10 > 8; 10 ≤ 20 → 20 A class.

Tools

200 Ah → 20 A → 20 A class (lnk_class_20).

Details

Required = 20 A; 20 ≥ 20 → 20 A class.

Tools

350 Ah → 35 A → 35 A class (lnk_class_35).

Details

Required = 35 A; 35 ≥ 35 → 35 A class.

Reference

400 Ah → 40 A → NO_MATCH (no CTA).

Details

40 A exceeds 35 A ceiling on this site.

Guides

C/10 shopping rule, chemistry, and polarity explained.