Description
The D250SE is a fully automatic, 5-step charger that supplies up to 20A of power to any 12V lead-acid or lithium service battery from 40–300Ah. It has selectable charge algorithms for flooded, AGM and lithium batteries and can use power from both the alternator and a solar panel or a wind turbine. The D250SE can maintain a stable output up to 20A to vehicles fitted with smart, ECU controlled alternators and also has a temperature sensor for optimised charging, regardless of weather conditions.
The D250SE is designed for use with solar panels rated at up to 300W but won't be damaged if a larger panel is connected – as long as the voltage from the panel is no more than 23V. (Open Circuit Voltage cannot exceed a MAXIMUM of 23V) Connecting a larger panel is actually a good way of compensating for poor perfomance on cloudy days!
The D250SE also features a battery maintenance function which sends 3-second pulses to the starter battery every 15 seconds. The current will vary according to the amount of power coming from the solar panel and the voltage at the starter battery.
Ideal for use in campervans, especially if they have smart alternators, the D250SE can be used on its own or with a CTEK Smartpass. The Smartpass 120S is also lithium compatible.
For full information, see the manual.
More Information
- CTEK D250SE Information sheet
- CTEK D250SE Manual
- A Simple Explanation of CTEK DC-DC Charging Systems.
Specifications
| PRODUCT CODE: | C8664B |
|---|---|
| Manufacturer's product code: | 40-315 |
| MANUFACTURER: | CTEK |
| Suitable for use with smart alternators?: | Yes |
| Input Voltage - Volts: | 11.5 / 23 |
| Output voltage - Volts: | Max 14.4V (14.7V in AGM mode) |
| Max. charging current - Amps: | 20 |
| BACK CURRENT DRAIN: | Less than 1Ah/month |
| Battery Temperature Sensor: | YES |
| Charging Ports: | 1 |
| Input from alternator - V: | 11.5v TO 23v |
| Input from solar panel - V: | 11.5V to 23V |
| Conventional alternator cut-in: | >13.1V, for 5 sec. (engine running, alternator charging) |
| Conventional alternator cut-out: | <12.8V, for 10 sec. (engine running, alternator not charging) or service battery voltage > starter battery voltage |
| Smart alternator cut-in V: | >11.8V, for 5 sec. (engine running, alternator charging) |
| Smart alternator cut-out V: | <11.4V, for 10 sec. (engine running, alternator not charging) or service battery voltage > starter battery voltage |
| Suitable for battery types: | All 12V lead-acid batteries including: Wet, A.G.M, gel, calcium and maintenance free + LiFePO4 lithium batteries |
| Max. power input from solar panel - Watts: | 300 |
| Solar regulator type: | MPPT |
| Cooling method: | Convection cooled |
| Operating temperature range - ?C: | minus 20 degrees C to plus 50 degrees C Automatic reduction of power at high ambient temperature. |
| Power reduction: | 30 degrees C 16A, 50 degrees C 13A |
| Enclosure class: | IP65 (splash and dust proof) |
| Notes: | This charger can only be used with solar panels that have a peak voltage maximum of upto 23V. Please ensure that your panel is compatible before purchasing. |
| Protections: | Temperature compensated charging, Reverse Polarity protection |
| Certification: | Fully certified for use in vehicles |
| Dimensions (L x W x H) - mm: | 192 x 110 x 65mm |
| Product Net KG: | 1.047 |
| Warranty - years: | 2 |
| weight: | 2.100 |
What's in the box
- 1 x Unit with wired temperature sensor
Questions
Customer Questions
Does the CTEK D250SE take any current from the vehicle's starter battery when the engine is off?
No. The consumption from the D250SE when it's in standby mode (green light flickering) is only about 3mA and this current comes from the leisure battery.
- Paul Ede, 13/05/2022
(Read all customer comments)
- Pat & Barry, 24/10/2022
(Read all customer comments)
- Andy Badger, 14/01/2020
(Read all customer comments)
(Read all customer comments)