Inverter building using Wiseguys Power board and the Nano drive board

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KeepIS Guru Joined: 13/10/2014 Location: Australia Posts: 2099	Posted: 01:48am 17 Jul 2024         Cpoc said   Can you upgrade from 2 temperature sensors to 4  temperature sensors. 2 for transformers and 2 for the mainboards ? Are they enough pins available ? I just checked before posting and quite a few replies are in, but I will still post my thoughts, I'm not trying to contradict anyone on the forum, just my thoughts for my inverter.   So, in "my opinion" there is really no need for the Heat sink temperature input. Possibility because of fast dead time, symmetrical drive and design of this power board, the FETS produce relatively little heat compared to the older design of inverters. The temperature is no more that around 5° above ambient in my inverter and no HS fan. The inverter was close to 4kw for over 2 hours yesterday, it's located inside a warm room at 29°, then FETS reached 32° and sat there - No cooling fan, the 3 series AC output windings on the toroids were slightly warm, core was at 37°, the only heat generated was in the 14 turn input winding and the choke winding cables, chokes felt like "mild" hand warmers - No toriod fan came on. I plan to use the HS sensor for the second toriod stack (no hardware mods needed), I'm keeping the unused ADC-7 input for measuring the 2nd capacitor bank voltage, allowing my inverter to make sure both capacitor banks are fully charged before enabling the Kilovac. The thing is, the Nano boards are so low cost, which is why we have one just to do the display, it would be easy to use that for processing other inputs for HS temperatures if you really wanted that and external control, the current DSO sync output pin, could be controlled from the other Nano, it would signal the inverter to ramp down or stop as needed. That's keeping it "really" simple and not interfering with the current Nano, it allows a fast response to that control input. At the moment, the controller Nano is just loafing along, the only real limitation is I/O pins.   The auto 6kW - 12kW control should not need to interface to the Nano as it's on the AC side of the toriods - hopefully I have the correct. The magnetizing power of my 3 stack toriod is around 17 watts DC input from the battery. If you are building an inverter that needs the power of two toriods and power boards, then you must have a big battery bank to run that, an extra 17 to 20 watts? But as noted some may have long periods of low power or idling, wiseguy address that in the last post I believe. _ Edited 2024-07-17 11:51 by KeepIS