The D250SE (CTEK Part No. 40-315) is a DC to DC fully automatic charger that’s designed to charge a Service Battery and is powered by the alternator/starter battery. With dual inputs the D250SE is also solar compatible (a standard solar controller is not necessary). The D250SE charger supplies up to 20A of power to any 12V lead-acid or lithium service battery from 40–300Ah. It also works if the starter battery and service battery are different chemistries, for example if the starter battery is lead/acid and the service battery is lithium. (Note: a service battery may also be called an auxiliary/aux battery, house battery, secondary battery, or backup battery.) This is a great charger for our V1 and V2 Lithium Deep Cycle Batteries.
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Description
CTEK D250SE 12V Smart Charger 20AThe D250SE (CTEK Part No. 40 315) is a DC to DC fully automatic charger thats designed to charge a Service Battery and is powered by the alternator starter battery. With dual inputs the D250SE is also solar compatible (a standard solar controller is not necessary). The D250SE charger supplies up to 20A of power to any 12V lead acid or lithium service battery from 40300Ah. It also works if the starter battery and service battery are different
Dual Inputs
The D250SE CTEK Charger has dual inputs and can charge the service battery from the alternator or a solar panel or both. The charger is designed to work with smart alternators and can still operate if the alternator is shut off but the vehicle has access to solar or wind power. So it can use power from the alternator, solar panel, wind power, or any DC power source can be used through the solar input port (within voltage spec). The D250SE can also charge the service battery from the solar input and the alternator in parallel using its built-in regulator to save fuel.
Optimum Charge
Continuous charging while the vehicle’s on the move means the batteries are fully charged in the shortest possible time. The built-in temperature sensor compensates for hot or cold conditions to prevent the battery from overheating or overcharging, so it always gets the optimum charge.
When the service battery being maintained is fully charged, the D250SE will automatically redirect overflow charge power to top-off the starter battery. The D250SE can maintain a stable output up to 20A to vehicles fitted with smart ECU controlled alternators.
LITHIUM
5-Step Program
- Accept*: Tests if the battery can accept charge. This step prevents that charging proceeds with a defect battery. (*Step 1 for lead/acid is Desulphation)
- Bulk: Charging with maximum current until approximately 90% battery capacity*. (80% capacity for lead/acid.)
- Absorption: Charging with declining current to maximize up to 95% battery capacity*. (100% capacity for lead/acid.)
- Float: Maintaining the battery voltage at maximum level by providing a constant voltage charge.
- Pulse: Maintaining the battery at 95–100% capacity. The charger monitors the battery voltage and gives a pulse when necessary to keep the battery fully charged.
Video about D250SE Charger
Specs
- CTEK PN: 40-315
- Input: 11.5–23V, 25A
- Output: Max 14.4/14.2/14.7V, 20A max
- Back-Current Drain*: Less than 1Ah/month
- Ambient Temperature: -4°F to +122°F (-20°C to +50°C)
- Battery Types: 12-Volt WET, EFB, Ca/Ca, MF, AGM, GEL, Lithium (LiFePO4, Li-Fe, Li-iron, LFP)
- Battery Capacity: 40–300Ah
- Insulation class: IP65 (splash and dust proof)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
My everyday espresso bean — fresh-ground changes everything
Flavor Name: Espresso, Size: 35.2 Ounce (Pack of 1)
I've gone through more bags of this than I can count — it's become my default espresso bean and I don't see that changing.
I grind it fresh for espresso and the difference vs. pre-ground is immediately noticeable — more crema, better aroma, cleaner taste. If you're still buying pre-ground, this is a good reason to stop.
Flavor-wise it's smooth and approachable — medium roast means no harsh bitterness, no aggressive dark-roast smokiness. Just clean, well-balanced espresso. The 100% Arabica shows; it doesn't have that robusta edginess you get in cheaper blends.
The 2.2lb bag is good value compared to buying smaller bags or anything from a specialty roaster. For everyday home espresso, the price-to-quality ratio is hard to beat.
Only mild gripe: the bag isn't the most resealable after the first open — I transfer mine to an airtight container. Minor inconvenience for a bean this good.
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Reviewed in the United States on May 30, 2026
★★★★★ 5
New Favorite Coffee
Flavor Name: Espresso, Size: 35.2 Ounce (Pack of 1), Flavor Name: Espresso, Size: 35.2 Ounce (Pack of 1)
Let me start out by saying I am a coffee fiend. I drink it all hours of the night and day and I've tried just about every brand you can think of. I took a chance ordering this and I'm so glad I did! Reading the other reviews helped me so I hope this helps someone else, too.
No one is paying me for my opinion, I'm not getting a single thing for writing this except the satisfaction of reporting on a quality product.
Not only is it a good price for how much you get, (09/25- $22 for 35.2 oz) but this is some of the smoothest coffee I've ever tasted. The beans are so shiny and just pretty. They're not all dried out and dull and dessicated looking like some coffees... The beans smell so good in the bag and even better once I've ground them. They grind up very quickly and easily too. There's no bitter aftertaste. Just pure, delightful, delicious coffee.
I got the 5/10 espresso, and it's perfect for me. it's just strong enough. I like medium-strong roasts, so if you prefer darker or lighter roasts they have plenty of other options.
I use both a drip coffee pot and a French press and this works beautifully in both. The crema in the French press is gorgeous.
It's so far above other brands- even Seattle's best and eight o clock and Cameron's, which I thought I really liked... They don't hold a candle to this.
I can't wait to try the other flavors.
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Reviewed in the United States on September 22, 2025
★★★★★ 5
Good Beans for Home Espresso
Flavor Name: Espresso, Size: 35.2 Ounce (Pack of 1)
I’ve been using these beans daily for about two weeks in my espresso machine, and they’ve been really consistent. The flavor is smooth and easy to drink, with a mild nutty note and low acidity. It’s not overly bitter, which I personally like for everyday coffee.
One thing I noticed — you do need to dial in the grind a bit to get the best crema, but once you do, it comes out pretty nice.
On the downside, the aroma and intensity are a little on the lighter side. If you’re into strong, bold espresso, this might not hit that mark.
Overall, this is a great everyday option — especially if you want something smooth and reliable without too much bitterness. Good value for the size too.
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Reviewed in the United States on March 20, 2026
★★★★★ 5
Economical, great taste and refreshing.
Flavor Name: Kiwi Strawberry, Size: 16.9 Fl Oz (Pack of 12)
very refreshing and nice flavor. I will definitely buy again. Great bottle size for hiking. Ingredients are blended well and the calorie count is low. Buying a multi-pack is also economical.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Crisp, Refreshing, and a Family Favorite
Flavor Name: Kiwi Strawberry, Size: 16.9 Fl Oz (Pack of 12)
Propel Kiwi Strawberry is one of our favorites. It’s crisp, refreshing, and has just the right amount of flavor without being overpowering. The kiwi strawberry taste is especially enjoyable and makes it easy to drink throughout the day.
We also like that it’s zero calorie and includes electrolytes and vitamins, making it a great option for staying hydrated during workouts or busy days.
Overall, a consistently refreshing drink that we always keep stocked in the house.
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Reviewed in the United States on April 24, 2026