Recent Posts

Pages: [1] 2 3 ... 10
1
Automation, Controls, Inverters, MPPT, etc / Re: Inverter Build Project.
« Last post by ClockmanFrance on September 18, 2020, 02:24:41 pm »
I have had a APC UPS 5000va, that would self start and would give about 3.7kw of 240vac from my 1100ah 48v battery bank.

The problem was that type of sheet laminate EW transformer was eating 200 watts from my precious batteries just running.

Now days i use a toroid wound core, and with suitable Ferrite Choke my new OzInverter Inverter now only uses about 30 watts, so far more efficient using a toroid core.

However, toroid cores and the Inverter power board need to soft start.
2
Automation, Controls, Inverters, MPPT, etc / Re: Inverter Build Project.
« Last post by Pete on September 16, 2020, 05:43:43 pm »
I am interested in how much Idle current that type of transformer draws. Old welding transformers like that are pretty easy to come by these days with everyone going for inverter welders. They may work out well for inverter builds. Just wondering about the looseness of the magnetic circuit and if they have horrendous idle currents.
Good luck
Pete
3
Automation, Controls, Inverters, MPPT, etc / Inverter Build Project.
« Last post by welshman on September 15, 2020, 06:21:32 pm »
As a backup inverter I plan on utilizing this casing and transformer.

I've been brainstorming lately on how to build a power board / mosfet circuit and i think i've come up with something that is new and should be interesting to see.

over the coming weeks i'll be putting this together and documenting it's build.

this is what im starting with.

4
Automation, Controls, Inverters, MPPT, etc / Re: Just bought a powerjack 15000, modding.
« Last post by Pete on September 15, 2020, 05:35:14 pm »
Good to hear that you got the beast working again.
I just recently bought an 8000 watt 24 volt powerjack. It had issues that I managed to sort out without blowing it up.
The output board was shorting to the transformer mount, the active and neutral were transposed which meant it shorted out when connected to my MEN connected switchboards, and a screw was rattling about inside from one of the mosfet boards.
Not much really except deadly to an unsuspecting user who would have been fooled by the switches not turning the active off on their power outlets.
The inverters work well once they are checked and tested.
Pity that some like yours decide to emit smoke and need more intense surgery.
Hope it goes well , look forward to seeing the new inverter you are planning on building
Pete
5
Automation, Controls, Inverters, MPPT, etc / Re: Just bought a powerjack 15000, modding.
« Last post by welshman on September 15, 2020, 03:13:43 pm »
inverter is back together and working with the new mosfets and repaired lf drivers. all 4 of the NY and MY chips on the lf driver needed replacing. The cheap HY3810  @ 4.3MOhm , seem to work just fine so far today. Even going back and forth into charging mode is working without blowing them up today.

only difference so far with these cheap fets is a slightly higher idle load.. not sure if it's related.

Next up, backup inverter build.. this is going to be something interesting, I'm sure it will be a mold breaker. new thread coming soon.
6
Automation, Controls, Inverters, MPPT, etc / Re: Just bought a powerjack 15000, modding.
« Last post by welshman on September 12, 2020, 12:15:20 pm »
both NY's on the lf driver board were shorted. replaced those, dont have any MY's, they're in the post. but they don't seem to be shorted. checking everything else as i go.

got a couple more mosfet boards made up. looking like new, i think.

a lot of 57ohm's were fried. 20k's not so much.

im a bit concerned about them being fake hy3810's due to the higher resistance and the package/logo is a little different, lets see what happens.

once the MY's here, should be next week and im confident the driver board is repaired. ill put it back together and see if it works.

if all good ill get started on making another inverter.
7
Automation, Controls, Inverters, MPPT, etc / Re: Just bought a powerjack 15000, modding.
« Last post by welshman on September 11, 2020, 01:57:10 pm »
is it 47ohm for the DC side mosfet board and 220ohm for the AC side mosfet boards for R14?

or does it matter, because i've been told from a reliable source that the AC boards work for both sides, but the AC boards have to be on the AC side due to there being ferrite beads on the centre leg of the fets?

the replacement fets ive received (cheap from china) are showing 4.3Mohm from drain to source.. the originals are 2.9Mohm, obviously they are going to get a bit hotter, but does 4.3Mohm make them unusable?

going for some hy4008 next time i order. wondering if i should stick to the P package or go for the W package with bigger legs. does the W in TO-247 format make good electrical contact with the heatsinks considering the centre hole has plastic inside it?
8
Automation, Controls, Inverters, MPPT, etc / Re: Just bought a powerjack 15000, modding.
« Last post by welshman on September 11, 2020, 01:20:46 pm »
on further inspection, i think i've got R14 wrong.. on my original boards that came with my powerjack they are 220ohm (2200 SMD CODE) but some of the replacement boards that i received have 47ohm as R14. 

Which is a bit confusing.

I need to swap what i've done with a 220ohm instead of 22kohm that i've mistakenly put there now.
9
Automation, Controls, Inverters, MPPT, etc / Re: Just bought a powerjack 15000, modding.
« Last post by welshman on September 11, 2020, 12:34:51 pm »
so far so good, two done. 6 more to go..

10
Automation, Controls, Inverters, MPPT, etc / Re: Just bought a powerjack 15000, modding.
« Last post by welshman on September 11, 2020, 06:50:31 am »
Hi Welshman,
Good to see your post.
Looks like you had a smoke test.

Are you going to rebuild the lf driver board or replace it?

Hi, dochubert, I'm now on my second smoke test. :D

I've got one driver board on order and two dead boards. I've got a load of NY and MY's, will replace those on the driver boards first as I'm sure they will have blown and test other components then rebuilding them. Will be having a go at repairing everything.

The mostfet boards sm-resistors have all been damaged, except one or two. incorrect resistance now being read with multimeter. So everything except the led and it's resistor are being replaced.

Handy RJ-45 connector was used as a spacer to fit the mosfets.

I have a few control boards now and have also acquired a nice giant chloride motive power 48v+ battery charger.  Will push 60v@70+amps into the batteries, but it gets very hot on the transistor side. It has a giant EH transformer in it, very heavy. Going to turn this into a backup, just need to get hold of a few power boards. Either from powerjack or have them made by pcbway.com using oztules gerber files. i would have already ordered them off pcbway, but the oztules gerber files i have scavenged from old threads don't seem to display correctly, the drill holes are in the wrong place.

The idea is to have a backup inverter using this, don't care about efficiency. It gets expensive to run a 18kw genset all the time while the powerjack is down for repair.

Ill be doing an overhaul on the unit this time. Suspending those toroid's using straps to expose the center and back to air cooling. Will help keep things cooler on those roasting hot days summer days, if we have any. Moving a few things around to make repair easier and tidying up the wiring and mounting external fuse box to avoid opening to see fuse states.

ive included a few screen shots from the software i wrote for the raspberry pi that monitors the voltage of the batteries and controls the inverter faults/generator start stops. i thought you would be interested to see how the LTO batteries handle to loads.

Pages: [1] 2 3 ... 10