Is there a known percent continuous loading of the 3KVA Multiplus and and 10 KVA Quattros such that there internal temperature will maintain at a sustainable point (IE not progress to an overload condition)? Obviously there are a lot of external factors that can influence this so assume a room with free flowing air and an ambient temperature of 25 c. If this is not something that has been tested does anyone have any anecdotal feedback? I have done a lot of these systems but they have generally all been for low continuous loads and brief peak loads. I’ve got a few systems coming up that will be powering air conditioners for extended periods of time. This will represent a higher continuous load. They could theoretically be powered by a smaller inverter but it would be running at a higher percent continuous load. I know from past experiences this will turn into a problem. Just trying to see if there are any rough guidelines to help size inverters in these situations.
So Max continuous load at 25C would be 2400W, with de-rating for temperature as shown.
I’ve also noticed that at lower battery voltages, the overload warning light will come on at a lower power than it does with a fully charged battery. You would also have to make some de-rating if the power factor is bad.
This would probably give a working continuous power of about 2200W for the MP3 model (I think the multiplus2 is similar, above data is for the multiplus).
Thanks for the reply. I’ve read the spec sheet many a times so I’m familiar with those numbers. From lived experience it seems like if you run an MP or Quattro at max continuous power for an extended period of time unit will not stay at 25C so it will progressively derate at that load. I could be wrong on this though. The spaces I install these units in almost always have some level of compromise in airflow. Maybe if you set an MP down in a large room that is at 25 C it will go on forever without getting hotter.