based on this table the quattro or multiplus 5k should output 4000*1.3 = 5200 watts for 30 minutes. if i have a point of use tankless hot water heater for my RV sink that is rated at 4800 watts, what would be the long term effects of using that heater for 5-10 minutes a day? since the heater has an adjustable temperature i would assume it will not use 4800 watts all the time but the question still stands, what would frequent short time power draws above the nominal watts at 25C but below the VA at 25C have on victron inverters?