Output current MPPT charge controller

[Jordi]

Perhaps a stupid question but when searching for MPPT I always see them being sized for the solar panel input (Rated charge current at an specific voltage).

What about the Discharge current? Is it exactly the same?

Asking for a solar panel that charges a battery for 5-6 hours while the discharge is expected to happen in 1-2 hours (so discharge = 3x discharge current).

I already assumed that PWM current limitation is both for charge and discharge, so should be the same for MPPT, right?

Thanks in advance for your contribution.

 

[gnubie]

Technically the PV input current limit and charger output current limit do not need to be the same but for many MPPT chargers the spec is the same so it's usually safe to assume they are the same unless the documentation states otherwise. MPPT chargers do work differently to PWM in that the input power (solar volts x solar amps = watts) is down converted (typically) to battery volts x higher amps = same watts.

If you want an example of a charger when the input limit is not the same as the output current limit, Victron 250/100 charger, but there are others.