MEAN WELL
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DC-DC Converters for RV, Marine and Truck 12V/24V/48V Systems
MEAN WELL DC-DC converters to step a 24V battery down to 12V, step 12V up to 24V, or isolate sensitive loads in RVs, boats, trucks and battery systems: enclosed SD converters, DIN rail DDR modules and RSD converters for vehicles. Models shown with a Request a quote button have no stock right now; send us the model and quantity for a quote and lead time.
- 24V โ 12VSD, DDR and RSD step-down models listed below
- IsolatedInput-output isolation listed on the SD, DDR and RSD datasheets
- 12V ยท 24V ยท 48VInput ranges for common battery systems
24V โ 12V
24V to 12V DC-DC converters: enclosed SD series
SD B-input models take a 24V battery to an isolated 12V output: 18โ36 VDC input on the SD-15, 19โ36 VDC on the SD-25 to SD-200 and 20โ36 VDC on the SD-350, per each datasheet. The SD-500L and SD-1000L cover 19โ72 VDC, so one model works on 24V and 48V systems.
Show all 9 models (1 more)
- SD-1000L-12720 Wยท 12 Vยท 60 ARequest a quote
24V โ 12V
24V to 12V DIN rail and vehicle converters (DDR, RSD)
DIN rail DDR converters for control boxes and battery cabinets: G-type DDR-15, DDR-30 and DDR-60 accept 9โ36 VDC, L-type 18โ75 VDC, and B-type DDR-120 and DDR-480 accept 16.8โ33.6 VDC. RSD converters are built for vehicle and railway batteries: RSD-30 and RSD-60 G-type take 9โ36 VDC and L-type 18โ72 VDC; the RSD-150B takes 16.8โ31.2 VDC. Check each datasheet for the exact range.
Show all 17 models (9 more)
- RSD-30G-1230 Wยท 12 Vยท 2.5 ARequest a quote
- RSD-30L-1230 Wยท 12 Vยท 2.5 ARequest a quote
- RSD-60G-1260 Wยท 12 Vยท 5 ARequest a quote
- RSD-60L-1260 Wยท 12 Vยท 5 ARequest a quote
- RSD-100B-12100.8 Wยท 12 Vยท 8.4 ARequest a quote
- RSD-150B-12150 Wยท 12 Vยท 12.5 ARequest a quote
- RSD-200B-12200.4 Wยท 12 Vยท 16.7 ARequest a quote
- RSD-300B-12270 Wยท 12 Vยท 22.5 ARequest a quote
- RSD-500B-12420 Wยท 12 Vยท 35 ARequest a quote
View all DDR models โView all RSD models โDC/DC DIN rail โ
Step 1
Step-down vs step-up, isolated vs non-isolated
Step-down converters take a higher battery voltage (24V or 48V) to a lower one (12V). Step-up converters do the opposite, for example 12V to 24V. Isolated converters separate input and output grounds, which helps with noise and ground loops; non-isolated converters share the negative and are smaller and cheaper.
Converter rating (W) โฅ output load (A) ร output voltage รท 0.8
Input current (A) โ output watts รท input voltage รท efficiency
Also available
Also available: 12V to 24V and 24V to 24V converters
12V to 24V: SD A-type (9.2โ18 VDC on the SD-15 to SD-50, 9.5โ18 VDC on the SD-100), DDR-120A-24 (9โ18 VDC) and the 9โ36 VDC G-type DDR and RSD models. 24V to 24V: SD B-type, SD-500L and SD-1000L, DDR L- and B-type and RSD L- and B-type, with input-output isolation. Check each datasheet for the exact range.
Show all 32 models (24 more)
- DDR-60G-2460 Wยท 24 Vยท 2.5 ARequest a quote
- RSD-30G-2430 Wยท 24 Vยท 1.25 ARequest a quote
- RSD-60G-2460 Wยท 24 Vยท 2.5 ARequest a quote
- SD-15B-2415 Wยท 24 Vยท 0.62 ARequest a quote
- SD-25B-2426.4 Wยท 24 Vยท 1.1 ARequest a quote
- SD-50B-2450.4 Wยท 24 Vยท 2.1 ARequest a quote
- SD-100B-24100.8 Wยท 24 Vยท 4.2 ARequest a quote
- SD-150B-24151.2 Wยท 24 Vยท 6.5 ARequest a quote
- SD-200B-24200.4 Wยท 24 Vยท 8.4 ARequest a quote
- SD-500L-24504 Wยท 24 Vยท 21 ARequest a quote
- SD-1000L-24960 Wยท 24 Vยท 40 ARequest a quote
- DDR-15L-2415 Wยท 24 Vยท 0.63 ARequest a quote
- DDR-30L-2430 Wยท 24 Vยท 1.25 ARequest a quote
- DDR-60L-2460 Wยท 24 Vยท 2.5 ARequest a quote
- DDR-120B-24120 Wยท 24 Vยท 5 ARequest a quote
- DDR-240B-24240 Wยท 24 Vยท 10 ARequest a quote
- DDR-480B-24480 Wยท 24 Vยท 20 ARequest a quote
- RSD-30L-2430 Wยท 24 Vยท 1.25 ARequest a quote
- RSD-60L-2460 Wยท 24 Vยท 2.5 ARequest a quote
- RSD-100B-24100.8 Wยท 24 Vยท 4.2 ARequest a quote
- RSD-150B-24151.2 Wยท 24 Vยท 6.3 ARequest a quote
- RSD-200B-24201.6 Wยท 24 Vยท 8.4 ARequest a quote
- RSD-300B-24271.2 Wยท 24 Vยท 11.3 ARequest a quote
- RSD-500B-24420 Wยท 24 Vยท 17.5 ARequest a quote
Vehicles
Wide-input and railway/vehicle models (RSD)
Vehicle and railway batteries swing well above and below their nominal voltage during cranking and charging. Wide-input RSD converters are designed for that; check the input range, operating temperature and vibration specs in the datasheet before choosing.
AC loads
Running 120VAC loads from batteries
For microwaves, power tools and other 120VAC loads, use a true sine wave inverter instead of a DC-DC converter. MEAN WELL TS, NTS and NTU inverters run from 12V, 24V or 48V batteries.
Related resources
DC/DC convertersThe full SD, RSD and DDR range.โDC/DC enclosed convertersEnclosed vehicle and battery converters.โOff-grid solar powerInverters, battery chargers and DC-DC for off-grid systems.โDC/DC on-board modulesPCB-mount converters.โDC/AC invertersRun 120VAC loads from a battery.โBattery chargersCharge the battery bank.โFind your MEAN WELL power supplySearch by voltage, wattage and type.โRequest a quoteFleet and project quantities.โ
24V to 12V converter FAQs
How do I get 12V from a 24V truck battery?
Use a step-down DC-DC converter with a 24V-range input and 12V output, rated at your 12V load รท 0.8. Example: 15 A of 12V accessories = 180 W, so at least a 225 W converter. Do not tap 12V from one battery of a 24V pair; it unbalances the batteries.
Isolated vs non-isolated DC-DC: which do I need?
Choose isolated when the load needs its own ground reference, for radios, instruments and anything sensitive to noise or ground loops. Non-isolated is fine for simple loads that share the vehicle negative.
Can a DC-DC converter charge a battery?
Not as a rule. A standard converter has a fixed output and no charge curve, so it can overcharge or undercharge a battery. Use a battery charger, or a model whose datasheet lists a battery charging function.
What size converter for my 12V loads?
Add the current of all 12V loads that can run together, multiply by 12 and divide by 0.8. Include start-up current of pumps, fans and compressors.
Can I use them on boats (vibration, humidity)?
Yes, if the model suits the environment: check the operating temperature, humidity and vibration specs in the datasheet, and mount the converter in a dry, ventilated place away from bilge water.
Need help choosing?
Send your battery voltage, the 12V or 24V load in amps and where it will be mounted to sales@htdelectronics.com, or request a quote.