Solar Freaks

I have designed a system employing 250 W pv panels, a 400 W motor and a basic inverter with a P&O MPPT. I would like to know what would be the ideal step change of voltage (for the solar pump, with an ac motor and all) to be employed (to increment or decrement to check if the power is increased) in the dc-dc converter of the MPPT. Thanks in advance.

It would be best to start again and use a much more efficient and lower cost design.

Use modern Thin Film PV panels. These have less efficiency but more energy. Your motor runs on energy not on efficiency.

Use a DC motor. A much smaller DC motor will pump the same amount of water and use much less power.

A DC motor costs LESS than an AC inverter so save the cost of an Inverter as well as saving inverter losses.

You will need a DC motor control that will keep the motor at its working voltage. If the voltage drops due to lack of Sunlight, the motor will slow down. There should be a cut out at the point where the motor stalls.

Paul