{"product_id":"40a-mppt-solar-charge-controller-12v-24v","title":"Sunvivae 40A MPPT Solar Charge Controller, 12V\/24V Auto, 520W\/1040W with LCD \u0026 Dual USB","description":"\u003c!-- Sunvivae 40A MPPT Solar Charge Controller — Shopify product description --\u003e\n\u003cstyle\u003e\n.sv40{--o:#f4511e;--n:#102a43;--b:#1769c2;--t:#1c2530;--m:#5c6773;--l:#e2e8ee;--s:#f5f8fb;max-width:1120px;margin:auto;color:var(--t);font-family:Arial,Helvetica,sans-serif;line-height:1.6}.sv40 *{box-sizing:border-box}.sv40 h2,.sv40 h3,.sv40 p{margin-top:0}.sv40 h2{font-size:clamp(28px,4vw,44px);line-height:1.15;color:var(--n);margin-bottom:16px}.sv40 h3{font-size:21px;line-height:1.25;color:var(--n);margin-bottom:9px}.sv40 p{color:var(--m)}.sv40 .hero{padding:52px 28px;text-align:center;background:linear-gradient(135deg,#fff,#edf4fa);border-radius:22px;margin-bottom:24px}.sv40 .kick{color:var(--o);font-size:14px;font-weight:800;letter-spacing:1.7px;text-transform:uppercase;margin-bottom:10px}.sv40 .lead{max-width:820px;margin:0 auto 24px;font-size:18px}.sv40 .pills{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}.sv40 .pill{padding:9px 14px;border:1px solid #ccd8e3;border-radius:999px;background:#fff;color:var(--n);font-size:14px;font-weight:700}.sv40 .sec{padding:48px 20px}.sv40 .center{text-align:center;max-width:820px;margin-left:auto;margin-right:auto}.sv40 .img{display:block;width:100%;height:auto;border-radius:18px}.sv40 .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:27px}.sv40 .card{padding:24px;border:1px solid var(--l);border-radius:16px;background:#fff;box-shadow:0 7px 24px rgba(16,42,67,.06)}.sv40 .num{display:inline-flex;align-items:center;justify-content:center;min-width:42px;height:38px;padding:0 10px;border-radius:999px;color:#fff;background:var(--o);font-weight:800;margin-bottom:14px}.sv40 .split{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}.sv40 .checks{list-style:none;padding:0;margin:16px 0 0}.sv40 .checks li{position:relative;padding:7px 0 7px 29px;color:var(--m)}.sv40 .checks li:before{content:'✓';position:absolute;left:0;color:var(--o);font-weight:900}.sv40 .spec{overflow-x:auto;border:1px solid var(--l);border-radius:16px}.sv40 table{width:100%;border-collapse:collapse;min-width:680px}.sv40 th,.sv40 td{padding:14px 16px;border-bottom:1px solid var(--l);text-align:left}.sv40 th{background:var(--n);color:#fff;font-size:14px}.sv40 tr:last-child td{border-bottom:0}.sv40 td:nth-child(odd){font-weight:700;color:var(--n)}.sv40 .steps{counter-reset:step;display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px}.sv40 .step{counter-increment:step;padding:22px;background:var(--s);border-radius:14px}.sv40 .step:before{content:counter(step);display:flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%;background:var(--b);color:#fff;font-weight:800;margin-bottom:12px}.sv40 .alert{padding:24px;border-left:5px solid var(--o);background:#fff5ef;border-radius:10px;margin-top:24px}.sv40 .alert h3{color:#99320e}.sv40 details{border-bottom:1px solid var(--l);padding:17px 4px}.sv40 summary{cursor:pointer;font-weight:800;color:var(--n)}.sv40 details p{padding-top:12px;margin-bottom:0}.sv40 .contact{text-align:center;padding:38px 24px;background:var(--n);border-radius:18px}.sv40 .contact h2,.sv40 .contact p{color:#fff}.sv40 .btn{display:inline-block;padding:13px 24px;border-radius:8px;background:var(--o);color:#fff!important;text-decoration:none;font-weight:800}.sv40 .note{font-size:13px;color:#6b7280;margin-top:12px}@media(max-width:760px){.sv40 .grid,.sv40 .split,.sv40 .steps{grid-template-columns:1fr}.sv40 .sec{padding:34px 12px}.sv40 .hero{padding:36px 18px}.sv40 .split{gap:22px}.sv40 .split .copy{order:-1}}\n\u003c\/style\u003e\n\u003cdiv class=\"sv40\"\u003e\n  \u003csection class=\"hero\"\u003e\n    \u003cdiv class=\"kick\"\u003eSunvivae High-Capacity Solar Control\u003c\/div\u003e\n    \u003ch2\u003e40A MPPT Charging for Larger 12V \u0026amp; 24V Systems\u003c\/h2\u003e\n    \u003cp class=\"lead\"\u003eManage higher-capacity off-grid solar charging with automatic 12V\/24V recognition, advanced MPPT tracking, flexible battery profiles, LCD monitoring and intelligent DC load control.\u003c\/p\u003e\n    \u003cdiv class=\"pills\"\u003e\n\u003cspan class=\"pill\"\u003e40A Rated Charging\u003c\/span\u003e\u003cspan class=\"pill\"\u003e520W \/ 1040W PV\u003c\/span\u003e\u003cspan class=\"pill\"\u003ePV Voc \u0026lt;100V\u003c\/span\u003e\u003cspan class=\"pill\"\u003eLead-Acid \u0026amp; Lithium\u003c\/span\u003e\u003cspan class=\"pill\"\u003eLCD + Dual USB\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"sec\"\u003e\n    \u003cdiv class=\"center\"\u003e\n\u003cdiv class=\"kick\"\u003e12V \/ 24V Auto Recognition\u003c\/div\u003e\n\u003ch2\u003eMore Capacity for Demanding Off-Grid Systems\u003c\/h2\u003e\n\u003cp\u003eConnect the battery first and the controller automatically identifies a 12V or 24V system. Match the PV array to the correct battery voltage and keep array open-circuit voltage below 100V under every operating condition.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cimg class=\"img\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/5888\/2397\/files\/2_97def74d-213e-4f62-946e-b1e4576037ed.png?v=1788082583\" alt=\"40A MPPT controller with 520W 12V and 1040W 24V solar input limits\"\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"sec\"\u003e\n    \u003cdiv class=\"center\"\u003e\n\u003cdiv class=\"kick\"\u003eAdvanced MPPT Technology\u003c\/div\u003e\n\u003ch2\u003eTrack Available Solar Power Efficiently\u003c\/h2\u003e\n\u003cp\u003eFast maximum-power-point tracking responds to changing solar conditions, delivering tracking efficiency of at least 99.5% and maximum conversion efficiency up to 97%.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cimg class=\"img\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/5888\/2397\/files\/3_237a6ace-1444-4e93-9e21-2464cda9c8e9.png?v=1788082583\" alt=\"POW-Keeper1240 advanced MPPT tracking and conversion efficiency\"\u003e\n    \u003cdiv class=\"grid\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cdiv class=\"num\"\u003e≥99.5%\u003c\/div\u003e\n\u003ch3\u003eMPPT Tracking\u003c\/h3\u003e\n\u003cp\u003eContinuously identifies the available maximum power point from the PV array.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cdiv class=\"num\"\u003eUp to 97%\u003c\/div\u003e\n\u003ch3\u003eConversion Efficiency\u003c\/h3\u003e\n\u003cp\u003eEfficiently converts available solar input into controlled battery-charging power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cdiv class=\"num\"\u003e40A\u003c\/div\u003e\n\u003ch3\u003eRated Charge Current\u003c\/h3\u003e\n\u003cp\u003eSupports larger solar battery systems when correctly sized, wired and protected.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"sec split\"\u003e\n    \u003cimg class=\"img\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/5888\/2397\/files\/6A_99151963-47dc-449d-b414-8a52edbb4d33.png?v=1788082583\" alt=\"Flooded AGM GEL and LiFePO4 battery compatibility\"\u003e\n    \u003cdiv class=\"copy\"\u003e\n\u003cdiv class=\"kick\"\u003eSelectable Battery Profiles\u003c\/div\u003e\n\u003ch2\u003eCompatible with Common Lead-Acid \u0026amp; Lithium Batteries\u003c\/h2\u003e\n\u003cp\u003eSelect the correct profile for the connected battery chemistry and verify all charging values against the battery manufacturer’s requirements.\u003c\/p\u003e\n\u003cul class=\"checks\"\u003e\n\u003cli\u003eFlooded lead-acid batteries\u003c\/li\u003e\n\u003cli\u003eAGM and GEL batteries\u003c\/li\u003e\n\u003cli\u003eLiFePO4 and supported lithium profiles\u003c\/li\u003e\n\u003cli\u003eUser-configurable charging parameters\u003c\/li\u003e\n\u003cli\u003e8–32V supported battery-voltage range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"sec\"\u003e\n    \u003cdiv class=\"center\"\u003e\n\u003cdiv class=\"kick\"\u003eIntelligent DC Load Management\u003c\/div\u003e\n\u003ch2\u003eFour Load Control Modes\u003c\/h2\u003e\n\u003cp\u003eControl compatible DC lighting and loads manually, by day\/night conditions or by a configured operating period. The dedicated LOAD output is rated at 30A and must never be used for an inverter.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cimg class=\"img\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/5888\/2397\/files\/7A_c9d3bb86-32da-4e34-a90c-2d9d6a648480.png?v=1788082583\" alt=\"Four load control modes on POW-Keeper1240 controller\"\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"sec split\"\u003e\n    \u003cdiv class=\"copy\"\u003e\n\u003cdiv class=\"kick\"\u003eFor RV, Cabin, Marine \u0026amp; Off-Grid Systems\u003c\/div\u003e\n\u003ch2\u003eReliable Charging—Installed in the Right Location\u003c\/h2\u003e\n\u003cp\u003eThe aluminum heat-sink design supports heat dissipation for stable operation. Because the enclosure is rated IP30, install the controller indoors in a dry, well-ventilated position away from moisture, rain, direct sunlight and flammable materials.\u003c\/p\u003e\n\u003cul class=\"checks\"\u003e\n\u003cli\u003eRV and camper battery systems\u003c\/li\u003e\n\u003cli\u003eOff-grid cabins and remote buildings\u003c\/li\u003e\n\u003cli\u003eMarine systems when mounted inside a dry cabin\u003c\/li\u003e\n\u003cli\u003eCompatible solar lighting, pumps and DC loads\u003c\/li\u003e\n\u003cli\u003eOperating temperature: −20°C to +55°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n    \u003cimg class=\"img\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/5888\/2397\/files\/9A_f23d8f59-93e6-4cc9-90c2-f290944ae657.png?v=1788082583\" alt=\"Indoor installation and off-grid applications for 40A MPPT controller\"\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"sec\"\u003e\n    \u003cdiv class=\"center\"\u003e\n\u003cdiv class=\"kick\"\u003eDual USB \u0026amp; Aluminum Heat Sink\u003c\/div\u003e\n\u003ch2\u003eConvenient Device Power with Efficient Cooling\u003c\/h2\u003e\n\u003cp\u003eTwo USB outputs provide convenient 5V power for compatible devices, while the rear aluminum heat sink helps dissipate operating heat. Keep adequate clearance around the controller and never block its ventilation area.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cimg class=\"img\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/5888\/2397\/files\/8_c9a6bf7b-9a53-491e-b9a4-fb428b4c923f.png?v=1788082583\" alt=\"Dual USB output aluminum heat sink and operating temperature of POW-Keeper1240\"\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"sec\"\u003e\n    \u003cdiv class=\"center\"\u003e\n\u003cdiv class=\"kick\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003ch2\u003ePOW-Keeper1240 Details\u003c\/h2\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"spec\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003ePOW-Keeper1240\u003c\/td\u003e\n\u003ctd\u003eRated Charge Current\u003c\/td\u003e\n\u003ctd\u003e40A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSystem Voltage\u003c\/td\u003e\n\u003ctd\u003e12V \/ 24V Auto\u003c\/td\u003e\n\u003ctd\u003eBattery Voltage Range\u003c\/td\u003e\n\u003ctd\u003e8–32V\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMaximum PV Voc\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;100V\u003c\/td\u003e\n\u003ctd\u003eMaximum PV Power\u003c\/td\u003e\n\u003ctd\u003e520W at 12V \/ 1040W at 24V\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eRated DC Load Output\u003c\/td\u003e\n\u003ctd\u003e30A\u003c\/td\u003e\n\u003ctd\u003eUSB Output\u003c\/td\u003e\n\u003ctd\u003e2 × 5V\/1A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMPPT Tracking Efficiency\u003c\/td\u003e\n\u003ctd\u003e≥99.5%\u003c\/td\u003e\n\u003ctd\u003eMaximum Conversion Efficiency\u003c\/td\u003e\n\u003ctd\u003eUp to 97%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eStatic Loss\u003c\/td\u003e\n\u003ctd\u003e≤50mA\u003c\/td\u003e\n\u003ctd\u003eProtection Class\u003c\/td\u003e\n\u003ctd\u003eIP30\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e−20°C to +55°C\u003c\/td\u003e\n\u003ctd\u003eLCD Temperature Range\u003c\/td\u003e\n\u003ctd\u003e−20°C to +70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e−30°C to +80°C\u003c\/td\u003e\n\u003ctd\u003eWorking Humidity\u003c\/td\u003e\n\u003ctd\u003e≤90%, no condensation\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGrounding Type\u003c\/td\u003e\n\u003ctd\u003ePositive grounded\u003c\/td\u003e\n\u003ctd\u003eLight-Control Voltage\u003c\/td\u003e\n\u003ctd\u003e5V\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eProduct Size\u003c\/td\u003e\n\u003ctd\u003e189 × 129 × 49 mm\u003c\/td\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e0.67 kg \/ 1.48 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n    \u003cp class=\"note\"\u003ePV power ratings are system limits under ideal conditions, not guaranteed output. Actual performance varies with sunlight, temperature, wiring, panel orientation and system configuration.\u003c\/p\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"sec\"\u003e\n    \u003cdiv class=\"center\"\u003e\n\u003cdiv class=\"kick\"\u003eCorrect Connection Order\u003c\/div\u003e\n\u003ch2\u003eBattery First. PV Array Second.\u003c\/h2\u003e\n\u003cp\u003eOpen all breakers or disconnects before wiring and verify cable polarity, conductor size and protection ratings.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"steps\"\u003e\n\u003cdiv class=\"step\"\u003e\n\u003ch3\u003eConnect the Battery\u003c\/h3\u003e\n\u003cp\u003eConnect the battery, close its breaker and allow the controller to power on and identify system voltage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"step\"\u003e\n\u003ch3\u003eConnect the PV Array\u003c\/h3\u003e\n\u003cp\u003eConfirm cold-weather array Voc remains below 100V, connect the PV wiring, then close the PV breaker.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"step\"\u003e\n\u003ch3\u003eConnect a DC Load\u003c\/h3\u003e\n\u003cp\u003eIf required, connect a compatible DC load within the 30A output rating. Connect an inverter directly to the battery.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"alert\"\u003e\n\u003ch3\u003eEssential Safety Notes\u003c\/h3\u003e\n\u003cul class=\"checks\"\u003e\n\u003cli\u003eNever connect the PV array before the battery.\u003c\/li\u003e\n\u003cli\u003eNever connect an inverter to the controller’s LOAD terminals.\u003c\/li\u003e\n\u003cli\u003eNever exceed the controller’s voltage, current or power limits.\u003c\/li\u003e\n\u003cli\u003eInstall indoors in a dry, ventilated location; IP30 has no water-protection rating.\u003c\/li\u003e\n\u003cli\u003eUse properly sized cables, fuses and breakers. Qualified installation is recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"sec\"\u003e\u003cdiv class=\"center\"\u003e\n\u003cdiv class=\"kick\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003ch2\u003eBefore You Connect\u003c\/h2\u003e\n\u003c\/div\u003e\n    \u003cdetails\u003e\u003csummary\u003eDoes the controller automatically recognize 12V and 24V?\u003c\/summary\u003e\u003cp\u003eYes. Connect the battery first so the controller can power on and identify system voltage before the PV array is connected.\u003c\/p\u003e\u003c\/details\u003e\n    \u003cdetails\u003e\u003csummary\u003eCan I connect a 100V solar array?\u003c\/summary\u003e\u003cp\u003eNo. PV array open-circuit voltage must remain below 100V, including the voltage increase caused by cold weather. Design with an appropriate safety margin.\u003c\/p\u003e\u003c\/details\u003e\n    \u003cdetails\u003e\u003csummary\u003eWhat battery types are supported?\u003c\/summary\u003e\u003cp\u003eSupported profiles include common Flooded, AGM, GEL and LiFePO4 batteries, along with configurable parameters. Always select the correct profile and follow the battery manufacturer’s charging requirements.\u003c\/p\u003e\u003c\/details\u003e\n    \u003cdetails\u003e\u003csummary\u003eCan I connect an inverter to the LOAD output?\u003c\/summary\u003e\u003cp\u003eNo. Connect an inverter directly to the battery through correctly sized cables and dedicated overcurrent protection. The LOAD terminals are for compatible DC loads within the 30A rating.\u003c\/p\u003e\u003c\/details\u003e\n    \u003cdetails\u003e\u003csummary\u003eCan it be installed outdoors or in a boat’s open deck area?\u003c\/summary\u003e\u003cp\u003eNo. IP30 provides no water protection. Install the controller indoors in a dry, ventilated location, including when used in marine systems.\u003c\/p\u003e\u003c\/details\u003e\n    \u003cdetails\u003e\u003csummary\u003eWhy might charging behavior change near the high-voltage disconnect point?\u003c\/summary\u003e\u003cp\u003eThe controller may apply PWM limiting near the high-voltage disconnect point to prevent further battery-voltage rise. This protective behavior does not change the product’s MPPT operating design.\u003c\/p\u003e\u003c\/details\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"contact\"\u003e\u003ch2\u003eNeed a Compatibility Check?\u003c\/h2\u003e\n\u003cp\u003eSend us your battery voltage, battery chemistry and solar-array Voc, Vmp and wattage. We’ll help you review the controller fit before ordering.\u003c\/p\u003e\n\u003ca class=\"btn\" href=\"https:\/\/www.sunvivae.com\/pages\/contact-us\"\u003eContact Sunvivae\u003c\/a\u003e\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Sunvivae","offers":[{"title":"Default Title","offer_id":44963947511901,"sku":"GF-017-MPPT40A","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5888\/2397\/files\/sunvivae-40a-mppt-solar-charge-controller-12v24v-auto-520w1040w-with-lcd-dual-usb-6043938.png?v=1789885511","url":"https:\/\/www.sunvivae.com\/products\/40a-mppt-solar-charge-controller-12v-24v","provider":"Sunvivae","version":"1.0","type":"link"}