Recent Posts

Pages: 1 ... 8 9 [10]
91
Users Projects / Re: My 12kW powerjack build - Ozinverter Inspiration!
« Last post by influence on June 25, 2017, 01:38:57 AM »
The heatsink cable connection points seem a little woeful....So I added some copper bus bars to the points...
One busbar for each of the primary heatsinks and one long busbar for the +V rail heatsink.

I had some earth / neutral switchboard bars lying around....hence the odd hole or two...

Note I added a plastic support brace for the primary side heatsinks ... it makes it more rigid when fitting
thick cables....and less likely to cause the board to crack...
92
Users Projects / Re: My 12kW powerjack build - Ozinverter Inspiration!
« Last post by influence on June 25, 2017, 01:35:35 AM »
I also noticed the tracks on the boards needed some beefing up. So I added more solder and 2mm copper wire to the tracks on the FET board and just added some solder to the control board where the 50A of 230V will flow!
93
Users Projects / Re: My 12kW powerjack build - Ozinverter Inspiration!
« Last post by influence on June 25, 2017, 01:32:36 AM »
Had a seriously productive weekend...

I have used a ferrite transformer calculator and figured out the suitable turns for my choke (18 - 20 uH).
I ended up using an E70 N27 core from RS.

I did a calc for the 3.5 turns it came to about 0.5mm gap
However at 70mm2 cable I cannot fit 3.5 turns.

So I went with 0.2mm gap with 2.5 turns. It *just* fit.
94
Oztules / Re: guess who bought a power jack inverter
« Last post by off the wall on June 24, 2017, 10:06:20 AM »
I use mine without it being connected to the grid. This means, however, that the output is not phase-tied to the grid and that upon switchover, if instant, there can be nasty transient jumps. I got over this by using a switchover box that you'll find on earlier pages of this thread.

Best wishes

OTW
95
Users Projects / Re: My 12kW powerjack build - Ozinverter Inspiration!
« Last post by oztules on June 24, 2017, 05:03:33 AM »
No...


..........oztules
96
Users Projects / Re: My 12kW powerjack build - Ozinverter Inspiration!
« Last post by influence on June 24, 2017, 04:28:47 AM »
Ok noted. Btw does it matter which side of the primary the choke is on?
97
Users Projects / Re: My 12kW powerjack build - Ozinverter Inspiration!
« Last post by oztules on June 23, 2017, 11:57:06 PM »
Sorry, I meant the secondary.... not thinking straight. If we wind for say 260v not 240v, then only use 240v, we are using lower flux, so lower iron losses... so more on the primary and secondary equally ( by ratio that is )

......oztules
98
Users Projects / Re: My 12kW powerjack build - Ozinverter Inspiration!
« Last post by influence on June 23, 2017, 10:11:02 PM »
Perhaps I can remove a turn or two from the secondary to reduce the ratio?
99
Users Projects / Re: My 12kW powerjack build - Ozinverter Inspiration!
« Last post by influence on June 23, 2017, 10:07:30 PM »
Unfortunately two reasons I cannot wind more...one there is no more room and two it would raise the primary another 5V if I wind one more turn...
100
Users Projects / Re: My 12kW powerjack build - Ozinverter Inspiration!
« Last post by oztules on June 23, 2017, 10:01:05 PM »
Bigger than any I have wound thus far. As you have plenty of room, it would not be a bad thing to add a few more turns to the primary, and so get even further than the saturation point. This will help get iron losses down further before you use the inductor.

That thing is huge.

.......oztules
Pages: 1 ... 8 9 [10]