CTEK SMARTPASS 120S
The CTEK SMARTPASS 120S is a battery charger with a recommended capacity of 28–800Ah and a supply of 11.5–23V.
Last updated: 11 October 2026
What battery it needs
- Amp-hours the maker recommends
- 28–800Ah
“Battery capacity 28–800Ah”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
Battery and charging
- What it draws on standby
- Less than 7Ah/month
- Input voltage
- 11.5–23V
- Auxiliary output
- Max. 23V, 80A
- How it charges
- connects the starter and service batteries together in order to charge them both from the alternator
“Back current drain Less than 7Ah/month”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
“Input 11.5–23V, Max 120A (350A temporarily for 10 seconds.)”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
“Output consumer Max. 23V, 80A”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
“SMARTPASS 120S connects the starter and service batteries together in order to charge them both from the alternator.”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
Battery care and safety
- Charger temperature cut-off
- >60°C (140°F)
“Temperature protection cut-in >60°C (140°F)”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
Sources
- Archived document
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
Retrieved October 10, 2026