===== 418mhz, your existing system must be 418mhz also, or this won't work ======. See Photos 📸 the solar panel outputting 8v which is perfect 🥰. Note : there is a hairline crack on the front casing, I've used b7000 glue on the inside, to seal it, the glue is waterproof, heat resistant and won't crack or shrink, not that rain would enter anyway, as the crack is hairline and its a vertical surface, so water just runs downwards, as said I've sealed it from the inside.
eBay