{"product_id":"wireless-tank-level-switch-for-solar-water-pumps-grundfos-compatible","title":"Wireless Tank Level Switch for Solar Water Pumps | Grundfos SQFlex Compatible","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe Back 40 Solar B40-WTS is a solar-powered wireless tank level switch that automatically stops your pump when a storage tank reaches full, eliminating costly overflows and manual monitoring on remote water systems.\u003c\/p\u003e\n\u003ch3 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eLong-Range Wireless Communication:\u003c\/strong\u003e Tested signal range of 2.5 miles with potential reach of 5+ miles, traveling through trees and terrain obstacles with magnetic-base antennas for flexible mounting.\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eSolar or AC Powered:\u003c\/strong\u003e Transmitter and receiver each run on dedicated solar panels included in the kit, with optional AC operation available for grid-connected pump systems.\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eCompatible with Stainless Probes or Float Switches:\u003c\/strong\u003e Works with both stainless steel moisture sensing probes and mechanical float switches, supporting normally open signal inputs across a wide range of sensor types.\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eBroad Controller Compatibility:\u003c\/strong\u003e Connects directly to Back 40 Solar pump controllers (PSC100, CU200, PSC200), Grundfos CU301, and generic VFDs or third-party controllers via operating-open terminal inputs.\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eComplete Kit — Ready to Install:\u003c\/strong\u003e Includes transmitter, receiver, two solar panels, tank full sensor or float, sensor splice kit, and mounting hardware — everything needed for a full installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe B40-WTS transmitter mounts at the storage tank and connects to your tank full sensor or float, while the receiver mounts at the pump controller and signals it to shut off when the tank is full. Periodic transmission checks occur every 10 seconds, providing reliable automated pump cutoff without continuous radio traffic.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe controllers ship pre-mounted to the solar panels for faster setup, with screws and mounting feet included for separate shade-mounted installation.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAntennas feature a magnetic base for attachment to any ferrous metal surface and can also be adhesive-mounted on non-magnetic structures. For best range, antennas should be mounted vertically at an elevated location with clear line of sight between the transmitter and receiver.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAC systems support both 120VAC and 240VAC via separate contactors, with a maximum current rating of 30A FLA — suitable for a wide range of submersible and surface pump applications.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eStatus indicator lights on both controllers confirm power, communication, and tank-full state at a glance. The sealed enclosures with locking wire glands protect electronics from moisture, debris, and insects in outdoor farm, ranch, and homestead environments.\u003c\/p\u003e\n\u003ch3 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\" style=\"width: 100%; height: 176.344px;\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth scope=\"col\" class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" style=\"width: 30.8371%; height: 19.5938px;\"\u003eSpecification\u003c\/th\u003e\n\u003cth scope=\"col\" class=\"text-text-100 border-b-0.5 border-border-300\/60 py-2 pr-4 align-top font-bold\" style=\"width: 66.3057%; height: 19.5938px;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 30.8371%; height: 19.5938px;\"\u003eWireless Range (Tested)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 66.3057%; height: 19.5938px;\"\u003e2.5 miles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 30.8371%; height: 19.5938px;\"\u003eWireless Range (Potential)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 66.3057%; height: 19.5938px;\"\u003e5+ miles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 30.8371%; height: 19.5938px;\"\u003eSensor Input Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 66.3057%; height: 19.5938px;\"\u003eNormally Open (NO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 30.8371%; height: 19.5938px;\"\u003eSensor Wire Gauge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 66.3057%; height: 19.5938px;\"\u003e14–26 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 30.8371%; height: 19.5938px;\"\u003eMax AC Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 66.3057%; height: 19.5938px;\"\u003e30A FLA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 30.8371%; height: 19.5938px;\"\u003eAC Voltage Options\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 66.3057%; height: 19.5938px;\"\u003e120VAC \/ 240VAC (separate contactors)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 30.8371%; height: 19.5938px;\"\u003eCompatible Controllers\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 66.3057%; height: 19.5938px;\"\u003ePSC100, CU200, PSC200, Grundfos CU301, Generic VFDs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 30.8371%; height: 19.5938px;\"\u003eTransmission Interval\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-border-300\/30 py-2 pr-4 align-top\" style=\"width: 66.3057%; height: 19.5938px;\"\u003e~10 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"The Solar Store","offers":[{"title":"Default Title","offer_id":53684738720054,"sku":"WTLS-1","price":895.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0903\/2233\/8102\/files\/wireless-water-level-switch-for-solar-pumps.png?v=1770970799","url":"https:\/\/thesolarstore.com\/products\/wireless-tank-level-switch-for-solar-water-pumps-grundfos-compatible","provider":"The Solar Store","version":"1.0","type":"link"}