Hello
I have a small question: my MPPT 75/15 inverter is only charging my battery at 3A, and I was wondering if anyone has any ideas. The battery is a 12V 120Ah lead acid.
An MPPT is a solar charge controller, an inverter is something else entirely.
Depending on the panel you use, how its angled towards the sun, how the weather is, etc there can be a variable amount of power available to charge your battery
The MPPT can charge with up to 15A
Yes, I know that! Yes, I know that when I angle the solar plate, it goes up to 80W, then it doesn’t go on. What can I do that all 400w go into the battery? I used Victron’s computer to calculate the right component.
Can you view it in VictronConnect app. If so, screenshot the battery settings and the status page when charging and upload here. The most common cause of low charging is high resistance in the cables from PV to charger or charger to battery. Either too long, too thin, loose connections, cheap breakers, switches or fuses. You need a multimeter to check the terminal voltages on tje panels, charger and battery when charging.
I measured the Cables , they’re all under an ohm. The screenshots are in full sunshine.
The PV voltage into the MPPT is only 14.4V. You do not give your panels specs (Vmp Imp) maximum power voltage and current. 14.4V at the MPPT input really is too low, you either have a failingbpanel or a poor connector in the panel to MPPT cables or on the MPPT terminals. You need to check this area with a multimeter.