Hi @Petar -
Depending on your vehicle and power source, you may not even be able to achieve that power draw! But yes, 500W seems like a safe limit. In 24C water, at 4s voltages, towing a diver I typically see a max power draw of 740 watts, peak - from 2x T500s on the DIY DPV!
The nozzles are likely to cause more issues with entanglement of seaweed or other lines… protecting your props so they are not the lowest point of the vehicle can protect them from damage from impact, like the BlueBoat hull does!