{"product_id":"sterling-power-bm12123-battery-maintainer-12v-to-12v-3a","title":"Sterling Power BM12123 Battery Maintainer, 12V to 12V 3A","description":"\u003cp\u003eThe Sterling Power BM12123 is a small 12V-to-12V battery maintainer that keeps an extra battery bank topped up from a bank that already gets charge from a battery charger, solar panel or wind generator. It is aimed at boats and camper vans, and works the same way in an RV or trailer.\u003c\/p\u003e\u003cp\u003eIt switches on when the main battery reaches about 13.3V and passes surplus charge across, holding the second battery about 0.2V below the main one. It uses FETs instead of a relay, so it draws under 1mA, makes no noise and has no contacts to wear out. It has no boost stage and is not for batteries with a heavy ongoing drain; Sterling says it will not charge a battery being drained at more than 2A.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSolid-state FET switching, no relay clicking on and off\u003c\/li\u003e\n\u003cli\u003eSelf-consumption under 1mA, so low solar or wind input is not wasted\u003c\/li\u003e\n\u003cli\u003eCurrent limiting, so engine starting loads do not affect it\u003c\/li\u003e\n\u003cli\u003eCan cover small standing loads such as battery self-discharge and engine-management drain (up to about 1A)\u003c\/li\u003e\n\u003cli\u003eIncludes 1 m of cable\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e BM12123\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput:\u003c\/strong\u003e 12V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e 12V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput current:\u003c\/strong\u003e 3A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTurn-on voltage:\u003c\/strong\u003e About 13.3V at the main battery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (L x W x D):\u003c\/strong\u003e 140 x 77 x 40 mm (5.5 x 3.0 x 1.6 in)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit weight:\u003c\/strong\u003e 0.25 kg (0.55 lb)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable included:\u003c\/strong\u003e 1 m (about 3.3 ft)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eGenuine Sterling Power with Sterling Power's warranty. Ships from our warehouse in Upland, California. Not sure it fits your setup? Ask us before you order.\u003c\/p\u003e","brand":"Sterling Power","offers":[{"title":"Default Title","offer_id":68285006577965,"sku":"RVP-26368","price":77.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/5625\/2717\/files\/IMG_6457white.jpg?v=1794524801","url":"https:\/\/www.rvpartsgiant.com\/products\/sterling-power-bm12123-battery-maintainer-12v-to-12v-3a","provider":"RV Parts Giant","version":"1.0","type":"link"}