Hopefully? Another 48vdc-240vac Toriod Inverter build.

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KeepIS Guru Joined: 13/10/2014 Location: Australia Posts: 1770	Posted: 10:38pm 02 Jun 2023         analog8484 said     KeepIS said   What Changed In my system, the R-Loss in the Fuse holder was removed, now DC input voltage only drops to 50V instead of 46v to 47v under high 300A+ current. What was the DC voltage drop with the fuse holder? I'm sure I answered that in your quote above.   Quote   Any idea how tight the terminal connections are? I had similar issues in the past and I finally got a torque wrench to consistently tighten all connections to 6 n-M unless there is specific instructions otherwise.  That definitely helped. This will be helpful for anyone not used to this problem and new to trials and tribulations of terminals torque, and something to be kept in mind. However, not everything in a home build system is comprised of standard purchased items with specifications. I fabricate a lot of my own terminals, connection plates, and through wall high current connection plates is one such item in use here. The advantage of 50 years of industrial machinery and electronics gives you a feel for nut, bolt and washer torque and material and dos and don’ts. Sometimes you grab a washer that appears to be the correct composition and it comes back to bite you. Time to go through the washer draws and resort them. Then there's the subject of surface flatness, and even something like a fine wire strand or wayward piece of insulation caught under the edge of a washer, obviously with higher and higher currents it's critical to get everything right. The other thing with R-Loss in connections under medium to high currents, is that it's not a constant, and it can cause random spiking of input voltage on top of load variations, some strange effects happen, especially when trying find an exact value of component to work in the system, and that system is under the influence of this problem. .