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Testing a 8000W LF SPLIT PHASE PURE SINE POWER INVERTER DC 24V Charger LCD (Read 880 times)
Solar Freak
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Re: Testing a 8000W LF SPLIT PHASE PURE SINE POWER INVERTER DC 24V Charger LCD
Reply #3 - Mar 9th, 2017 at 8:38pm
 
So now after you have tested the Power Jack split phase on the Air Conditioner and it liked it. so now will you use it on your well pump? So now you think the Power Jack is not so bad after all and kinda like it seeing how the motors don't seem to mind it despite the flat top under a big load. Also it was not to expensive to purchase. So life is good now with the Power Jack spit phase inverter. Maybe or should I buy one for to hook to my breaker box to power my whole house in an emergency since it is split phase. It seems to perfect cheap solution for a breaker box since they have two one ten rails or 120 these days.� Cheesy And it is a very serviceable Unit huh. So maybe the PJ is not so bad after all? Roll Eyes I really like these smiley faces I want to use this one for fun Huh Angry LOL they crack me up.
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« Last Edit: Mar 9th, 2017 at 8:40pm by Solar Freak »  
electron
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Re: Testing a 8000W LF SPLIT PHASE PURE SINE POWER INVERTER DC 24V Charger LCD
Reply #2 - Feb 23rd, 2017 at 3:20am
 
For whatever reason on this inverter, it's labeled 110V 220V (it's a split phase like normal USA house power is).

I did see it regulate voltage so there is a circuit in there that does it and might be able to be modified but it's going to take time to figure it out if I decide to try that. It worked and powered everything so I don't see a reason to mess with it just for use as a back up inverter.

It would not be my first choice for a inverter to use all the time after running these tests.

The Xantrax Prosine is a very good inverter and designed well and is very compact.
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Solar Freak
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Re: Testing a 8000W LF SPLIT PHASE PURE SINE POWER INVERTER DC 24V Charger LCD
Reply #1 - Feb 23rd, 2017 at 12:16am
 
Why on some inverters like the Power Jack does the Voltage drop down to like 115 120. I noticed on my fridge that it ran slower on the fan when used my Go power on it. Especially the Aims it had lower voltages. This sucks because it don't cool as well because the fan blows slower. So why do they make them like this?
I noticed that the Xantrax Quiet power or its basically a Prosine 1800 watt it seems to run the correct voltage or faster. Fridge gets nice and cool like power company power. So are they saving money by making the inverters that have low voltage at times? It dont seem to matter on my TV though.
Oh yeah if the batteries get a lower voltage it makes the cheaper inverter have a lower voltage. I have not noticed it on my xantrax this happening although I cannot check the voltage since I no longer own a Killowatt meter. I have bought 3 or 4 of them in the past and I murdered them with solar power thats a different story but its time for a new one.
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electron
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Testing a 8000W LF SPLIT PHASE PURE SINE POWER INVERTER DC 24V Charger LCD
Feb 22nd, 2017 at 9:35pm
 
Ebay title: (about $330)
8000W LF SPLIT PHASE PURE SINE POWER INVERTER DC24V/AC110V&220V 60HZ/Charger/LCD
Made by Power Jack

UPDATE: Be aware that this inverter I have WILL OVERHEAT and shut down at a continuous 2000W after 1 hour. The transformer was at 244F (117.8C) when I pulled the cover. The unit I got only has one toroid transformer in it. Looking at YouTube videos it seems that it should have two. It was sold as a "2016" model. If it did have two transformers it might handle 4000W. The AC fuse installed was a 15A on one side of the 220V only. See other details below.

It is good to know that it could be used for a cheap back up inverter.

BUT.... Being the geek I had to look at the waveform. The Xantrax Prosine 1800W Pure Sine I have is better of course under load the waveform isn't perfect (most aren't) but it is still more of a sine wave looking thing under load.

The PJ at about 1000W starts to look more like a triangle wave (pics below) and the very tops of the wave start to flatten.

The fridge really didn't care and the 1000W microwave was fine with it, also a 600W window A/C but the volts are low like 110V to 115V and I knew that up front since it said 220V. Computers are fine with it of course, they could run off of a square wave. CFL lights are OK too.

Point is for a back up it's great for around $300. I don't know if a well pump would like the triangle wave though at 6000W (motor using a run cap) that flat top part would get worse. I did not test at that power level and I don't know if I want to.

I think they may push a triangle wave into it and since it's a transformer it tries to straighten it up and at low power you can't see it. I am thinking if you keep pulling more and more power that "flat top" would widen to the point that the waveform is more like a square wave.

I don't think mine is bad, like a mosfet crapped out because it's on BOTH sides of the waveform. They simply don't put in a sine wave to start with I am sure.

The nice thing about this inverter is that most of it is repairable and they sell several boards for it, including little mosfet PCBs with all the mosfets mounted and all you do is screw it down with screws, no de-soldering or anything, easy fix and you could keep some spares around.

The DC side mosfets are 30A and there are 6 of them per "H Bridge" side so 180A max but you should run them at half really so 90A at 24V is 2160W if you don't want to poof it.

30N10   N-Channel MOSFET
Drain Current ID=30A TC=25C Drain Source Voltage VDSS= 100V(Min)
Static Drain-Source On-Resistance RDS(on) = 0.77 ohm (Max)
Fast Switching for switching power supplies,converters, AC and DC motor controls

It does seem to regulate the voltage OK, a crap inverter could just keep going down and down as the load goes up. That also means I could someday find the voltage reg circuit and turn it up to 120V !

One other small problem I found is it's low voltage warning beep and shutdown doesn't quite work correctly. It seems to depend on how fast the voltage changes. With large batteries of course it's slow and it will warn at about 21.2V but I took it down to 18.3V and it still did not cut off. So I would not depend on that function.

The manual says you only get 4000W per 110V side of course. Even though it has a big fan, the manual says 165F is the ROOM shutdown temp so if the room is hot it may not take much to reach the shutdown temp.

Youtube: A guy tests the 5000W version of the LF Inverter
http://www.youtube.com/watch?v=ZWsjmMsaIPo

Pictures of the actual waveforms below, first is no load, then slightly flat tops at 600W then worse at 1000W, and a waveform reference. You can see how the lines to the sides start straightening up for the sine / triangle wave. And the flat top increases of course.
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