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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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

🔋Supports 40–300Ah batteries

☀️MPPT solar panel regulator

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€ 928.92

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Charge smarter, roam farther — never get left powerless again!

POWER UP ANYWHERE - Delivers a robust 20A charge to keep your 12V lead-acid or lithium batteries ready for any adventure.
SAFE INTELLIGENT - Splashproof, reverse polarity and short-circuit protected—engineered to safeguard your vehicle’s sensitive electronics.
ALL WEATHER PERFORMANCE - Built-in temperature sensor adapts charging for optimal battery health in any climate.
SOLAR OPTIMIZED CHARGING - Integrated MPPT regulator maximizes solar input, turning sunlight into reliable power on the go.
SMART DUAL BATTERY MANAGEMENT - Automatically switches charging from service to starter battery, ensuring your vehicle starts every time.

The CTEK D250SE is a fully automatic 5-step 20A charger designed for 12V lead-acid and lithium (LiFePO4) batteries ranging from 40 to 300Ah. Featuring selectable charge algorithms, MPPT solar regulation, smart alternator compatibility, and a built-in temperature sensor, it ensures efficient, safe, and optimized charging for RVs, trucks, and overlanding vehicles. Its intelligent dual battery management automatically redirects power to the starter battery once the service battery is full, all while protecting sensitive electronics with splashproof and reverse polarity safeguards. Backed by a 2-year warranty, it’s the ultimate power companion for the modern adventurer.

Specifications

ASIN	B07X4YTP1P
Amperage	20 Amps
Best Sellers Rank	#1,194,162 in Automotive ( See Top 100 in Automotive ) #2,043 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 (168)
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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