Review on 🌞 Enhance Solar Charging Efficiency with iSunergy MPPT Solar Charge Controller: 30A 12V/24V Auto Regulator with Dual USB Port and LCD Display for Lead Acid Batteries by Chris Martin

Many things in life "if it sounds too good to be true, it probably isn't" and this is one of them. For a device to be an MPPT, it must have a higher battery charge current than the current coming from the PV, because that's the whole idea of an MPPT ---- You save maximum power, so a higher current is produced for a weaker battery . required charging voltage. For example if the PV and Bat voltages are 17 vs 14 you should see a reverse current ratio of say 1.4 vs 1.7 assuming 100% conversion but in reality it is usually around 1, 4 vs 1.6. In this case, when measuring the currents, I got a charge current equal to or slightly less than the PV current. So it is not an MPPT controller. However, since it is cheaper than many PWM controllers, it can easily function as a PWM.