Wake up to no lights in conversion and amber light is on solid what does this mean how can I fix it?

Please contact CTEK directly so we can assist you better.

What voltage should i see if i test on the output for a lifepo4 charging profile (black signal wire to the +)? shouldnt it be 14.6?

Please see page 12 of the D250SE user Manual for lithium charge program details including voltages.

Can i use the d250se to charge a 24ah lifepo4 battery?

Our D250SE is designed for all types of 12V lead-acid batteries (WET, EFB, Ca/Ca, MF, AGM and GEL) and 12V (4cells) Lithium-ion batteries (Li-FePO4, Li-Fe, Li-iron, LFP) between 40-300Ah.

Is the housing weather proof? Can I mount this under the hood or do I need to wire it into the cabin?

The D250SE is IP65 rated (splash and dustproof). It is not waterproof and must be protected from the elements. The D250SE should be mounted with in 6 feet of your service batter/battery bank. This charger requires both a starter battery and service battery.

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CTEK D250SE, 20A, 12V Battery Charger For Starter And Service Batteries In RV, Truck And Overlanding Vehicles, Solar Battery Maintainer, 12V Lithium Ion Battery Charger And Smart Alternator Compatible

Product ID: 186600064

Details

Brand
CTEK
Color
Black
Item Weight
700 Grams
Output Voltage
14.4 Volts
Product Dimensions
4.3"D x 7.6"W

⚡20A max charging power

☀️MPPT solar optimization

🌡️Built-in temperature sensor

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Description

🔋 Charge smarter, roam farther — power your journey with CTEK D250SE!

SOLAR SMART - Advanced MPPT tech maximizes your solar panel’s output—never miss a ray of power.
POWER UP ANYWHERE - Delivers a robust 20A charge to 12V lead-acid & lithium batteries (40–300Ah) for unstoppable adventures.
WEATHERPROOF SAFE - Splash/dustproof design with reverse polarity and short-circuit protection keeps your gear safe on the go.
DUAL BATTERY MASTERY - Seamlessly charges both service and starter batteries, prioritizing your vehicle’s readiness.
SMART ALTERNATOR FRIENDLY - Works flawlessly with all smart ECU-controlled alternators—no compatibility worries.

The CTEK D250SE is a fully automatic 20A, 12V battery charger designed for RVs, trucks, and overlanding vehicles. It supports lead-acid and LiFePO4 lithium batteries (40–300Ah), features selectable charge algorithms, MPPT solar optimization, and smart alternator compatibility. With built-in temperature sensing and robust safety protections, it ensures efficient, safe charging in all conditions, maintaining both service and starter batteries seamlessly.

Specifications

ASIN	B07X4YTP1P
Amperage	20 Amps
Best Sellers Rank	#1,287,471 in Automotive ( See Top 100 in Automotive ) #2,147 in Battery Chargers
Brand	CTEK
Built-In Media	D250SE
Color	Black
Current Rating	20 Amps
Customer Reviews	4.3 4.3 out of 5 stars (169)
Global Trade Identification Number	07340103403159
Input Voltage	12 Volts
Item Dimensions D x W x H	4.3"D x 7.6"W x 2.6"H
Item Type Name	Battery Charger
Item Weight	700 Grams
Manufacturer	CTEK
Mfr Part Number	40-315
Model Number	40-315
Number of Ports	2
Output Voltage	14.4 Volts (DC)
Specification Met	CE
Unit Count	1.0 Count
Warranty Description	2 year manufacturer

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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