{"product_id":"solamr-mppt-solar-charge-controller-gm20a-20a-50v-with-lcd-dual-usb","title":"SolaMr MPPT Solar Charge Controller GM20A - 20A\/50V with LCD \u0026 Dual USB","description":"\u003cp\u003e\u003cstrong\u003eThe SolaMr GM20A is a compact MPPT solar charge controller that maximizes power harvest for 12V or 24V systems while supporting Gel, Sealed, Flooded and LiFePO4 batteries.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for small-to-medium off-grid setups, the GM20A combines true MPPT tracking with a robust metal enclosure, dual cooling fans and a clear LCD so you can monitor charging at a glance. It accepts up to 50V PV input and 20A output, includes two 5V\/3A USB ports, and protects batteries with temperature compensation and seven core safety functions. Whether mounting in a van, cabin or shed, this controller aims to deliver efficient charging and long-term reliability.\u003c\/p\u003e\n\n\u003ch3\u003eHow much more solar energy will the GM20A capture compared to basic controllers?\u003c\/h3\u003e\n\u003cp\u003eThe GM20A uses genuine MPPT algorithms and high-quality components to operate very close to the panel’s maximum power point, improving energy capture versus PWM controllers. This typically results in faster charging and better performance in varying light conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUp to 99.9% MPPT tracking accuracy and 98% conversion efficiency.\u003c\/li\u003e\n  \u003cli\u003eCharges up to ~25% faster than typical non-MPPT units.\u003c\/li\u003e\n  \u003cli\u003eEfficient recovery from partial shading or changing sun angles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it work with my battery and solar array size?\u003c\/h3\u003e\n\u003cp\u003eThe GM20A auto-detects 12V or 24V systems and supports multiple battery chemistries, including Gel, Sealed, Flooded and LiFePO4. Its 20A continuous output and 50V maximum PV input suit modest arrays and common off-grid batteries.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for up to 240W on 12V systems or 480W on 24V arrays.\u003c\/li\u003e\n  \u003cli\u003eSelectable battery modes plus a USER option for custom voltages.\u003c\/li\u003e\n  \u003cli\u003e0V Lithium wake-up for deeply discharged LiFePO4 batteries.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat protections and durability features keep the system safe?\u003c\/h3\u003e\n\u003cp\u003eThe controller integrates a full protection suite to guard both the battery and the controller electronics. A metal housing, dual fans and TVS lightning protection help maintain stable operation in tough conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSeven protections: short-circuit, over-discharge, overcharge, over-current, open-circuit, reverse polarity and over-temperature.\u003c\/li\u003e\n  \u003cli\u003eIP21 splash-resistant rating and TVS surge protection for lightning events.\u003c\/li\u003e\n  \u003cli\u003eTemperature compensation to reduce battery stress and extend life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is it to see status and connect everyday devices?\u003c\/h3\u003e\n\u003cp\u003eThe GM20A presents key system information on a readable LCD and includes two USB ports for mobile devices, making it practical for daily use. Installation is straightforward and suitable for DIY solar projects or professional installs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eClear LCD shows battery level, charge state and fault codes.\u003c\/li\u003e\n  \u003cli\u003eTwo 5V\/3A USB outputs for phones, tablets or small electronics.\u003c\/li\u003e\n  \u003cli\u003ePlug-and-play wiring with labeled terminals and compact footprint.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The SolaMr GM20A is aimed at homeowners and travelers who need a reliable, efficient MPPT controller for small cabins, RVs, boats, sheds or off-grid hobby systems. It fits users who want improved energy yield over PWM controllers, multi-chemistry battery support, and a compact, durable unit with clear monitoring and device charging ports.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the GM20A support 24V systems?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The GM20A automatically detects and supports both 12V and 24V systems up to 50V PV input.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can it charge LiFePO4 batteries?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It supports LiFePO4 with a 0V wake-up feature and configurable charge\/discharge thresholds.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SolaMr","offers":[{"title":"Default Title","offer_id":56799267291476,"sku":"B0D66JCB3K","price":70.75,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/solamr-gm20a-front-panel.jpg?v=1786730326","url":"https:\/\/gardenluxe.co.uk\/products\/solamr-mppt-solar-charge-controller-gm20a-20a-50v-with-lcd-dual-usb","provider":"Gardenluxe Uk","version":"1.0","type":"link"}