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Hacking GTIL On-grid Inverter
#11
What I was noting was the 20-200 random vs less variablity on the bench.

The DC HV boost arrangement is a standard approach with high frequency inverters. If the DC bus voltage is stable then that cuts all of the input side issues out.

On the unit, can you pull up the screen that shows the voltage waveform and have the working unit do that side by side to see is the faulty unit is displaying any distortions ? If the A-D input/signal has issues it may be showing up on the waveform readings ?
If you can't quantify how much they cost, it's a deal, I'll buy 5 of them for 3 lumps of rocking horse ......
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#12
(09-08-2019, 11:42 PM)completelycharged Wrote: What I was noting was the 20-200 random vs less variablity on the bench.

The DC HV boost arrangement is a standard approach with high frequency inverters. If the DC bus voltage is stable then that cuts all of the input side issues out.

On the unit, can you pull up the screen that shows the voltage waveform and have the working unit do that side by side to see is the faulty unit is displaying any distortions ? If the A-D input/signal has issues it may be showing up on the waveform readings ?
Checking the DC bus voltage is a good idea. I had not got that far yet, still trying to get the MPPT to properly load the input DC supply. As for the output waveform, none of my 3 GTILs has ever had a voltage display that I really believed. They all show an imperfect sinusoid, from day 1.
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#13
(09-09-2019, 02:36 AM)suntan901 Wrote:
(09-08-2019, 11:42 PM)completelycharged Wrote: What I was noting was the 20-200 random vs less variablity on the bench.

The DC HV boost arrangement is a standard approach with high frequency inverters. If the DC bus voltage is stable then that cuts all of the input side issues out.

On the unit, can you pull up the screen that shows the voltage waveform and have the working unit do that side by side to see is the faulty unit is displaying any distortions ? If the A-D input/signal has issues it may be showing up on the waveform readings ?
Checking the DC bus voltage is a good idea. I had not got that far yet, still trying to get the MPPT to properly load the input DC supply. As for the output waveform, none of my 3 GTILs has ever had a voltage display that I really believed. They all show an imperfect sinusoid, from day 1.
I replaced the 10 input caps, 1000uF @ 100 VDC, and the result is the same. 75 +/- 5 watts. Wish I had a dc controller board for this version of Main Board so I could substitute.
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#14
Well, it turns out that the input capacitors WERE bad, after all, but the dc controller board was also. So, this one is FIXED, after replacing both. Thanks to all for the advice. I never would have suspected the caps, as they have only about 2500 hours operating time. Angry
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