Recent Posts

1

Automation, Controls, Inverters, MPPT, etc / Re: OzInverter with 3 Stages Charging System for 12v,24v,36v and 48VDC & Transfer.

« Last post by Sandramar on Today at 12:44:15 pm »

Hi,
I do appreciate your comment and feel free to give away your thoughts .
Traditionally Modified sinewave inverters charging system use this method (see pic). Except that they turn off the inverter before apply the  controlled Triac charging system . The picture attached is for a half bridge system with transfer circuit option . Old TRACE ( now Xantrex) inverters do it thsi way too.
There is a relay for charging system , so when the inverter section is turn off because the Public grid is present , this relay feed the triac section and if you notice is on a "charger tap"  which elevates the voltage at the low voltage side of the transformer . The Power mosfet protction Diodes serve as rectifiers (which usually are same Amp rating as the mosfet rating itself) .
I found the answers for this post already and both were yes . The only doubt will be clear out on real test .
I already wrote the firmware and Test it in a simulation enviorement.
At this moment I'm routing the new controller PCB in order to make them fabricated.
I built several "OzInverter " but never as Transfer and charger unit which is my goal.

Any aditional input is apreciated
Thanks

2

Automation, Controls, Inverters, MPPT, etc / Re: OzInverter with 3 Stages Charging System for 12v,24v,36v and 48VDC & Transfer.

« Last post by lighthunter on Yesterday at 01:17:08 am »

I have to admit i cant wrap my head around what you are trying to accomplish. Maybe a block diagram sketch of power flow on a napkin snap photo an upload. It may make perfect sense then. If you are wanting to energize your large toroid with utility mains power while your fets stay asleep connected to it. I dont think thats a great idea. Seems doable but its a very short distance to a boom.

LH

3

Classifieds / Search Sexy Womans in your city for night

« Last post by Sasaka-4628 on May 23, 2024, 12:50:09 pm »

Pretty Girls in your town

4

Off Grid Living / Alternative Housing / Enter and try your luck!

« Last post by anaomalarmes on May 14, 2024, 11:23:45 am »

Your lucky day could be today!

5

Oztules / Re: home brew 5kw simple inverter..... 20kw surge ( really), and seems bullet proof

« Last post by Sandramar on May 09, 2024, 01:12:21 pm »

Hello,
Always reading these informations.
For the Feedback transformer I have got a lot of 0.5 VA small transformers 220vac/14vac . I only have One inverter in use and is not touched in years .
My question would these 0.5VA would work for the feedback transformer ?
I'm working on a transfer & charging profile for these "Oztules" inverters and I would like to use these transformers since they are  in hands and would fit in PCB  with a small footprint.
For charging purposes I'm using a transformer tap controlled by triac at high voltage side of the transformer . This tap  will increase the voltage at low voltage side of the transformer .

I'm Asumming That if I Control SD with microcontroller to shut down the inverter before apply the triac 's tap. Since it is a full bridge I may use  the mosfet body  diode as rectifiers .

Any Input is appreciated.

6

Automation, Controls, Inverters, MPPT, etc / OzInverter with 3 Stages Charging System for 12v,24v,36v and 48VDC & Transfer.

« Last post by Sandramar on May 06, 2024, 10:27:45 am »

Hello,

I'm developing a Firmware in order to control a Triac at high votage side of the transformer with a charging tap .
In my case is  a 90vac tap  Relay switched when Mains are present. Transformer high voltage side is (Neutral,90vac and 120vac). In tention is use Body Diode of Mosfets as full wave rectifier.
Control board will follow votage 3 stage profile depending on voltage selected ( of course battery and transformer must match)
Before switch to "charging" state when mains are present , I'm asured that Inverter is powered down ( using SD) .
Questions :
1-There is a 20k resistor across Gate/source on OzInverter ... When shut down this resistor would be held the mosfet at the ground potential ?
2-The feedback Transformer which connected VFB , May use a 0.5 VA 14vac ?  I want to incorporate a smallest transformer there .

Any comment/suggestion would be highly Apreciated

SandraMar

7

Weather / Re: Been about a year

« Last post by bj on February 11, 2024, 05:03:39 am »

   We did finally get a bit of snow, (about 2 inches).
As we type away, supposed to be above freezing the next couple of days, then back to more seasonal.
   Longer range, they are expecting dry.  Province is expanding firefighting capabilities.  Last year was a record
for acres of forest burned.  (some fires still burning).
   In general, this area used to have all planting of crops done by May 24th long weekend.  Now the ones that
are planting 2 to 3 weeks earlier are doing much better.   My land renter did so, and got 150 bushel per acre of oats.
   All we can do is try to adapt.
bj

8

Weather / Re: Been about a year

« Last post by Wolvenar on February 10, 2024, 07:50:17 pm »

We are still warm here and basically no snow. I just put a water pump in the truck Jan 30th in a tee shirt in the driveway at +53F. Normally about then we are in a cold snap and will not have seen above 0F sometimes not above -20F for weeks, and would not for weeks more. It's still in the +40f range. We are quickly exiting the time period we could see negative temps this year. I'm a bit worried that without the normal weeks of melting and warm up we will see temps from August by June.
Not wanting to guess where August might bring us. But this is not anything this area has not seen, we have had this but its been a few generations.

9

Users Projects / Re: Off grid water heating project

« Last post by Wolvenar on January 29, 2024, 07:26:03 am »

Wouldn't an MPPT accomplish what your trying for here, or am I missing something?

10

Weather / Re: Been about a year

« Last post by bj on January 18, 2024, 05:17:28 am »

  Hi Wolv
No arguments from me on the lack of snow.  Haven't had to clear snow at all this winter.
Did eventually pay for the warm temps though.  Had lows in the -40 range for about 4 days, but starting to ease up now.
  Stay warm and happy.
BJ