{"product_id":"12v-20a-dc-to-dc-battery-charger-for-rv-van-boat-off-grid-lithium-lead-acid-batteries","title":"12V 20A DC-DC Battery Charger - Lithium and Lead-Acid, RV, Van, Marine","description":"\u003cp\u003eThe entry point in Rich Solar's DC-DC range, and the right choice when the limiting factor is the alternator rather than the battery. It converts alternator output into a correct charge profile for a 12V house bank and acts as the isolator between starter and house batteries, so one box does two jobs.\u003c\/p\u003e\n\u003ch2\u003eWhy this charger\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e20A output, 250W nominal, working range 18-22A.\u003c\/li\u003e\n\u003cli\u003eA physical mode switch selects 12V AGM, flooded, gel or lithium — no app, no configuration software.\u003c\/li\u003e\n\u003cli\u003eTwo-stage charging for lithium, which will safely reactivate an over-discharged LiFePO4 pack and take it to full. Three-stage for lead-acid.\u003c\/li\u003e\n\u003cli\u003eHandles both traditional and smart variable-voltage alternators, the latter being the reason a plain isolator relay no longer works on modern vehicles.\u003c\/li\u003e\n\u003cli\u003eBattery isolation blocks reverse current, so drawing the house bank flat cannot leave you unable to start the engine.\u003c\/li\u003e\n\u003cli\u003eD+ ignition terminal restricts charging to engine-running conditions.\u003c\/li\u003e\n\u003cli\u003eLC low-current terminal is genuinely useful on this model in particular — 20A is already gentle, and LC mode lets you go gentler still for a weak or small alternator.\u003c\/li\u003e\n\u003cli\u003eOver-voltage, over-temperature and reverse polarity protection, with standby draw under 0.6A.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBe aware before you buy\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThe D+ cable, LC cable and temperature sensor are \u003cstrong\u003enot\u003c\/strong\u003e included and must be bought separately if you want those functions.\u003c\/li\u003e\n\u003cli\u003eThe RJ11 temperature sensor adjusts charge voltage for hot or cold weather, but applies to lead-acid only, not lithium.\u003c\/li\u003e\n\u003cli\u003eEfficiency is stated as above 85% measured at 14VDC and 30% load, which is the manufacturer's most favourable test point.\u003c\/li\u003e\n\u003cli\u003eAt 20A, a 200Ah lithium bank taken to 50% will need roughly five hours of driving to refill. If your drives are short, step up to the 40A.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eChoosing between 20A, 40A and 60A\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAll three are functionally identical apart from current, physical size and weight. Same 10-16VDC input window, same charge logic, same protections.\u003c\/li\u003e\n\u003cli\u003eThis 20A model suits banks up to roughly 100Ah, older or smaller alternators, and builds where solar does most of the work and the alternator is a backup.\u003c\/li\u003e\n\u003cli\u003eThe 40A (500W) is the common choice for 200-300Ah lithium builds; the 60A (750W) is for large banks with short drive times and an alternator sized to match.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e8.4 x 7.4 x 3.1 inches and 4.0 lb — the smallest of the three, which matters in a tight van cabinet.\u003c\/li\u003e\n\u003cli\u003eInput operating range is 10-16VDC.\u003c\/li\u003e\n\u003cli\u003eSize cable and fusing for the full 20A on both input and output.\u003c\/li\u003e\n\u003cli\u003eMount with clear airflow around the heatsink.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWarranty\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCovered by Rich Solar's standard limited warranty. No specific term is published on the product page; contact us to confirm the current coverage period.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RICHSOLAR","offers":[{"title":"Default Title","offer_id":46391896408214,"sku":"RS-DC20","price":95.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/5291\/1254\/files\/RS-DC20_DC-DC_Charger12V_20A_1.jpg?v=1785837446","url":"https:\/\/sunenergydepot.com\/products\/12v-20a-dc-to-dc-battery-charger-for-rv-van-boat-off-grid-lithium-lead-acid-batteries","provider":"sunenergydepot.com","version":"1.0","type":"link"}