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Forum Index : Electronics : Wiseguy New Inverter Build Nano R6

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wiseguy

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Joined: 21/06/2018
Location: Australia
Posts: 1018
Posted: 12:42pm 14 May 2024
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  mab1 said  Hi Mike,
Regarding the chinese board: apologies, I didn't mean to add to your workload - for the small price of another board i may as well just get one, and when i eventually look at it i can post here for feasability and advice (unless you really want to do it of course   ).


I will not promise anything but I am curious to see what might be required to make it work with a Nano controller.

Re postage to UK I will check into it and the customs forms etc required & cost.

There are other solutions available which I will discuss with you via email or PMs.

I am curious, what do you expect postage cost to UK would/might be - a rough guess is fine, it just helps clarify what method we might use.

Not sure if there are any MPPT controllers kicking around - lets see if anyone offers up a couple.  Maybe Poida has some spare.....
If at first you dont succeed, I suggest you avoid sky diving....
Cheers Mike
 
Murphy's friend

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Joined: 04/10/2019
Location: Australia
Posts: 602
Posted: 04:31pm 14 May 2024
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Thank you for the variac explanation Mike, I do have a variac here (the transformer variety) but was not sure what you meant with that word in regard to the control card.

Now, I do like to copy your ideas (I hope you don't mind) and when I saw your interesting use of a 'current type voltage transformer' for sensing the AC mains voltage I thought I'll have to try this.

So I laid out a control PCB with this instead of the original LT1638 that Poida used.
But I'm curious if this will work with the original Nano program?
I'm using your early version of the MC74AC86 gate drive BTW.

I'm not interested in many of the features your latest control card offers (have external fan temperature controllers and no need for automatic start up or a status display monitor.

I finished the PCB layout but have not sent it for manufacturing yet until I know if my original Nano works with your AC sensing or if I require a different program.

Thanks
 
wiseguy

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Joined: 21/06/2018
Location: Australia
Posts: 1018
Posted: 11:25pm 14 May 2024
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Klaus you are welcome to email me a copy of your schematic so I can comment - in short I believe it should work with normal Nano code.
If at first you dont succeed, I suggest you avoid sky diving....
Cheers Mike
 
Murphy's friend

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Joined: 04/10/2019
Location: Australia
Posts: 602
Posted: 04:10am 15 May 2024
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Thanks Mike, email sent to m...s@a...m.com.au
I hope this is still correct
 
wiseguy

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Joined: 21/06/2018
Location: Australia
Posts: 1018
Posted: 04:36am 18 May 2024
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Ok the Variac boards are back, I built one up and it seems to work superbly first time.

I have a pretty good energy meter which gives RMS volts Amps and true Watts.

Once calibrated, the Variac V & A tracked the energy meter within 10mA (only up to 4A tested) and 1V.  The 1 V is because it only has whole digits no decimal places but even 1V in 240 is about 0.4% or better, from a setting of a few volts to 240V very accurate.

I plugged in an inductive type Fan that showed 230mA of current but the energy meter has it as 200mA so as predicted the accuracy for reactive loads will be poorer, resistive loads should be spot on.

The offset at the bottom end for V & A can be tweaked when calibrating for best accuracy. ie set the volts to a few volts and tweak the offset so it reads the same as the reference meter and then check the top end again and as needed enter the max value in the on screen menu.

So time to call for interest in sets of PCBs - I have the following shows of interest to date.  If there are any changes to the list its fine just let me know.  I expect that I will give it at least a week or so before placing any orders.  In the interim I will prepare the BOMs etc with all the final component values - the original BOMs are still 95% accurate - a few added parts and a few resistor value tweaks though.

I will also post final schematics and BOMs etc in a couple of days - have some other tasks to get done first so maybe Tuesday.

The board sets and part numbers are as described near the bottom of page 4 of this thread.

Member name     Given Name      Inverter        Variac        Controller only
KeepIS                Michael                                      1                   3
Disco4now          Gerry                   2                     1
Cobbler               Michael                5
Bryan1                Bryan                   2                     1
RogerDW            Roger                  2                     1
mab1                  Marcus                 1                     1

PM's are probably the best way to indicate what you are after and the quantity.
Edited 2024-05-18 23:17 by wiseguy
If at first you dont succeed, I suggest you avoid sky diving....
Cheers Mike
 
KeepIS

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Joined: 13/10/2014
Location: Australia
Posts: 1405
Posted: 02:48am 21 May 2024
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Hi Mike, can you modify my order as follows:

3 Variac  
1 Inverter
3 Controllers

I can see me having a lot of fun with the Variac design  

Thanks
It's all too hard.
Mike.
 
wiseguy

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Joined: 21/06/2018
Location: Australia
Posts: 1018
Posted: 05:38am 21 May 2024
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Sure Michael, order modified.

Ok time to bite the bullet and ask for quantities of MPPT + Brain-board orders.

I suspect that a few of the inverter guys (yes you too MAB) are probably after some MPPT boards so I think it makes sense for me to order some if required and consolidate the freight for Inverter/Variac requirements to include MPPT boards at the same time if you want them.

If others just want MPPT boards preferably within Australia just PM me with quantity.
Cost should be similar to last order and I am guessing ~$15 ea ?? (Poida ordered the last lot).

Still working on BOMs schematics PCBs etc.  I'm wishing I hadn't retired so I could go back to work for a rest.....
If at first you dont succeed, I suggest you avoid sky diving....
Cheers Mike
 
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