Inverter building using Wiseguys Power board and the Nano drive board


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analog8484
Senior Member

Joined: 11/11/2021
Location: United States
Posts: 116
Posted: 07:02pm 01 Dec 2024      

  KeepIS said  A single battery can start a 540A 100Hz DC input for something like the external workshop dust extraction system at power up, but that's a brutal test and any internal resistance problem in the battery is going to make it fail that test.

Two parallel batteries have no problem.


Thanks for confirming.  Large lithium based battery banks indoors make me nervous

KeepIS

Guru

Joined: 13/10/2014
Location: Australia
Posts: 1707
Posted: 04:20am 20 Dec 2024      

Lots of rain and overcast days with 34°C temperatures and unbelievable humidity.

The Hot water system is running beautifully on the inverter under these conditions and absolutely no problems for the battery bank and existing solar over a few days of this bad weather.

I've had the inverter running at 4kW when starting the biggest work-shed loads, the peak DC input currents are hitting over 730A, once the extractor startup load settles  the running load is at 5.2kW, the next piece of cutting machinery is started and stopped around 20 times for for a few hours, each start is another 390A Peak DC above the running 5.2kw running load.

The results - well nothing happens, the Inverter remains silent, the Toriods never get above 39°C so cooling fans never come on, and the Heatsink temperature rise is around 2° on each heatsink (convention cooling).

Keep in mind that the Inverter is running an AirCon which is keeping the room that the inverter is located in at around 28°C and of course removing the Humidity.

I've had one fault (which does not affect the inverter), one digital DC input meter has lost it's display, back light still works - it's a few years old so I guess it's time to replace it. I might break it open and have a look, but easier to replace it really.

So, now it's time to pull the old Hot water controller panels down and replace them with higher power panels for more solar to the Inverter, I'm also going to put another 6kw of solar facing slightly south on the back of the shed roof for those overcast rainy days, panels don't care where they face in those overcast conditions.        

This paralleled output stage Inverter is simply amazing.
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Cpoc
Regular Member

Joined: 28/05/2024
Location: Portugal
Posts: 79
Posted: 07:51pm 20 Dec 2024      

I have received my boards from wiseguy looking forward to doing my build in he new year.

Any update on getting the the real-time display working with home assistant. Would live to see the LCD info show up in a home assistant display.

Perhaps a hard wire solution.

KeepIS

Guru

Joined: 13/10/2014
Location: Australia
Posts: 1707
Posted: 05:36am 10 Feb 2025      

I've knocked together a few PDF files from information spread across the build threads to help with setting up the Nano for programming and some Menu info.

The Zip below includes info and links to the low cost programmer board used for the Nano and various mods for a few of the Nano PCB models to stop the USB controller from causing a reset to a running Nano Inverter, also included are the Terminal Setup and Nano Fuse settings howto and using the small AVR program below.

So, for anyone interested, the Zip include the Inverter HEX files and the small standalone AVR program used to upload the Hex file to the Nano.

Link Download ZIP
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Revlac

Guru

Joined: 31/12/2016
Location: Australia
Posts: 1064
Posted: 10:21am 11 Feb 2025      

Thats great to have it in one place (folder),  I printed out the  Menu How To.

KeepIS

Guru

Joined: 13/10/2014
Location: Australia
Posts: 1707
Posted: 10:13pm 11 Feb 2025      

Thanks Aaron, it's a bit rough but I hope to add to it and improve it in the future.

FYI, I've updated the Download with 4 PDFs merged into one, also some minor text corrections.

Footnote added 2025-02-12 11:55 by KeepIS
I have also combined and added more info to Menu usage and Terminal setup.

KeepIS

Guru

Joined: 13/10/2014
Location: Australia
Posts: 1707
Posted: 01:40am 16 Feb 2025      

I was looking at the Photos of Aarons build (Revlac) and I noticed I still has not updated the top line of the Inverter LCD display.

I've just done that on both Dual and Single versions of the Code and download has been just updated. No other changes.



I felt that indicating when SPWM drive was enabled was more important to me than an indication of the Start/Stop request flag which was either ON or OFF, especially since any error that could inhibit the inverter Start/RUN cycle is clearly indicated on the LCD, there are around 18 fault condition messages and that's not including the various LCD I-O status indications.

Full Zip with Nano Info

Just Hex files and basic info
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Edited 2025-02-16 16:07 by KeepIS