TL;DR: The powerhouse for your 48V infrastructure. The Demke 729-48-SD efficiently transforms unstable 12V or 24V input voltages into a rock-solid 48V output (95% efficiency). With 450W of power, full galvanic isolation, and a CC\/CV charging profile, it is the premier choice for Starlink conversions, charging 48V LiFePO4 batteries, and demanding marine applications. Thanks to its full polyurethane potting, it operates at 100% load even at 85\u00b0C without any power derating. The transition from 12V to 48V systems is the key to minimizing line losses and reducing cable cross-sections. The Demke 729-48-SD acts as the essential technological bridge. As an isolated buck-boost converter, it masterfully balances input voltage fluctuations (ranging from 12V to 32V) to deliver a precise and stable 48V output. – Starlink 12V Conversion (V2 & V3): Power your Starlink system directly from your 12V onboard network. By eliminating inefficient AC inverters, you save up to 40% energy\u2014a critical factor for self-sufficient campers and digital nomads. – B2B Charging for 48V Lithium Storage: Utilize your existing 12V alternator to safely recharge large 48V LiFePO4 battery banks while driving. The integrated CC\/CV characteristic ensures battery-friendly, precision charging. – Marine & Yacht Electronics: Protect sensitive navigation and communication equipment. The galvanic isolation prevents ground loops and provides effective protection against electrolytic corrosion on the hull. – Industrial Robotics (AGV\/AMR): Ensure an interference-free 48V supply for sensors, LiDAR units, and control electronics in autonomous guided vehicles. Unlike standard mass-market converters, the Demke 729-48-SD is built for extreme environments. The electronics are completely encapsulated in polyurethane (PU) potting, making the device entirely vibration-proof and “climate-proof.”<\/p>\n","protected":false},"excerpt":{"rendered":"
The 729-48-SD by Demke Electronic is a galvanically isolated DC\/DC buck-boost converter for a nominal input voltage of 24 VDC. It operates across an input voltage range of 12 to 32 VDC and delivers 48 VDC at up to 9.50 A, equivalent to 450 W of output power. Efficiency reaches up to95% at nominal input voltage and full load.<\/p>\n","protected":false},"featured_media":8570,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[82],"product_tag":[],"product_application":[168,152,112,111,156,154,97,148,170,150],"product_standard":[146,140,138,144,126,130,136,132,122,120,118,124,128,134,142],"class_list":["post-8569","product","type-product","status-publish","has-post-thumbnail","product_cat-isolated-dc-dc-buck-boost-converters","first","instock","shipping-taxable","product-type-simple"],"acf":{"vin_min":12,"vin_max":32,"vin_nom":24,"vin_peak":35,"efficiency_max":95,"vout":48,"iout":9.5,"pout":450,"output_configuration":"single","em_filter":"input_output","switching_frequency":130,"max_capacitive_load":"infinite","shutdown_voltage_min":-0.2,"shutdown_voltage_max":2.8,"enable_voltage_min":0,"enable_voltage_max":0,"switch_high_voltage_min":0,"switch_high_voltage_max":0,"mounting":"wall","connection_type":"Kabel","plug_pin_diameter":"","cable_lengths":"300 mm","produktstatus":"bto","temp_min":-40,"temp_max":85,"thermal_shutdown_temp":90,"ip_rating":"","mtbf":1100000,"technical_features":["cc_cv","parallel","no_load_short_circuit","emi_input_output","input_low_ripple_noise","wide_input"],"remote_control":false,"isolation_type":"galv_isolated","potting":false,"certifications":["reach","rohs","ce"],"datasheet_de":"","datasheet_en":"","drawing":"","safety_instructions":"https:\/\/demke-electronic.com\/wp-content\/uploads\/729.005_SI.pdf","step":"","download_base":"729.005","step_model":"size_130x130x28","pim_id":"237979000000157695","web_visible":true,"sync_status":"success","last_sync":"2026-09-01 10:25:24","successor_sku":"","alternative_skus":"","h1_de":"729-48-SD | Galvanically isolated DC\/DC buck-boost converter 24 VDC to 48 VDC, 450 W","h1_en":"729-48-SD | Galvanically isolated DC\/DC buck-boost converter 24 VDC to 48 VDC, 450 W"},"_links":{"self":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product\/8569","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/media\/8570"}],"wp:attachment":[{"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/media?parent=8569"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_brand?post=8569"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_cat?post=8569"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_tag?post=8569"},{"taxonomy":"product_application","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_application?post=8569"},{"taxonomy":"product_standard","embeddable":true,"href":"https:\/\/demke-electronic.com\/en\/wp-json\/wp\/v2\/product_standard?post=8569"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}