CTEK D250SE
The CTEK D250SE is a battery charger with 50–300 W (Max OCV solar panel 23V), dimensions of 192 x 110 x 65mm (L x W x H), a recommended capacity of 40–300Ah and a supply of 11.5–23V.
Last updated: 11 October 2026
What battery it needs
- Amp-hours the maker recommends
- 40–300Ah
“Battery capacity 40–300Ah”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
Battery and charging
- Continuous output, by temperature
- 30°C 16A, 50°C 13A
- What it draws on standby
- Less than 1Ah/month
- Battery types it states
- All types of 12V lead-acid batteries (WET, EFB, Ca/Ca, MF, AGM and GEL)
- Temperature compensation
- 23 mV/°C from 25°C/77°F
- Input voltage
- 11.5–23V
- Solar capacity
- 50–300 W (Max OCV solar panel 23V)
- How it charges
- from an alternator or from a solar panel, or from a combination of both
“Power reduction 30°C 16A, 50°C 13A”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
“Back current drain Less than 1Ah/month”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
“Battery types All types of 12V lead-acid batteries (WET, EFB, Ca/Ca, MF, AGM and GEL)”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
“Temperature-compensated charging voltage 23 mV/°C from 25°C/77°F”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
“Input 11.5–23V, 25A (Max OCV solar panel 23V)”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
“Maximum solar panel power 50–300 W (Max OCV solar panel 23V)”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
“The D250SE charges the service battery either from an alternator or from a solar panel, or from a combination of both.”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
Battery care and safety
- Operating temperature range
- -20°C to +50°C (-4°F to +122°F)
“Ambient temperature -20°C to +50°C (-4°F to +122°F)”
Source: ctek.com/cdn/shop/files/D250SE-manual-low-UK-EN.pdf?v=7623624676274545348
Size and fit
- Overall dimensions
- 192 x 110 x 65mm (L x W x H)
“Dimensions 192 x 110 x 65mm (L x W x H)”
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