Review on Upgraded SUNER POWER 12 Volt Waterproof Solar Battery Charger & Maintainer Pro - Advanced MPPT Charge Controller - 18W Trickle Charging Kit with Built-in Solar Panel for Cars, Boats, Motorcycles, RVs, and More by Virgilio Patton

available. Day, True South North orientation and same latitude inclination, I could not get DC amp readings while red diode was blinking as NORMAL. It's humble to admit that I designed my house with a stand alone solar system, so believe me when I say "no reading" it means no reading, not even 0.1 amp. Read the manual and ask yourself if I'm missing something because the battery doesn't seem to be dying either. Hmmm. (Updated) To measure low solar boost power (where x voltage = watts) the current is so small (≤1 amps) that it must be fitted with a "REL" button when attempting a DC to use a supported clamp meter. (relative key) to compensate for residual magnetism in the jaws and get correct readings. Had to google it and due to the headache and added time wastage this unit gets a 5/5 rating, but the relevant section of the manual gets a 3/5 rating and is needed for 'geek-proofing' on average on both therefore get an overall rating of 4/5 from me.