So here was my plan: Have 3 LVX-6048s connected in parallel in order to be able to run my house totally off-grid. I have 2 EVE 48v 280AH DIY batteries connected to copper bus bars both run by overkill solar BMS's. The battery busbars are to ensure equal voltage to all MPP units. From there I have equal length cabling to the all-in-ones so they read the same voltage.
From the beginning one of the units (now known as unit 2) would not feedback to the grid - it saw the incoming voltage and would signal like it was going to provide grid feedback, but it never actually kicked on.
Fine I thought - my plan is to run off-grid anyways, so I turn off grid feedback on all the units. Now they are hooked up in parallel as shown in the manual, and they run just fine, with one unit (unit 1) sometimes reading slightly lower voltage than the others. Weird I think, but maybe it's because the majority of the solar is coming into unit 3, and I have some shading in the mornings on the string going into unit 1. Fast forward about 3 months and now the unit is throwing 'battery voltage low' regularly. When it does throw the error, unit 1 turns off and stops producing power... BUT THE OTHER UNITS DON'T!!! Now, this leads to all sorts of issues in my house. Every one of my (15+) AFCI breakers are ruined since now the other units are only producing what they think are 2/3's of the load. After replacing with standard breakers, whenever this happens my house voltage is ALL OVER THE PLACE - this has blown out several light bulbs as well as my coffee maker. After over a month of trying to get support from MPP, they send a program for me to try and re-program the voltage reading of unit 1 so it doesn't do this. The problem? You need a serial port... this is 2022, Microsoft Windows PCs essentially removed the legacy COM ports. But on top of that, the majority of the time unit 1 is reading the proper voltage on the batteries and matches within 1 volt or so the other two units. It eventually got worse where it couldn't read proper voltage for more than about a minute or two and then it would drop from say 53 volts to 34 volts, and kick off.
Pissed off at the lack of support, I decided I would just run off the other two units until I figured out what the problem truly was. So I re-work the parallel cabling for just 2 units and find out now I have a floating neutral. I try running on both units (2 & 3) individually - the same result. So now THEY are both broken.
As a last-ditch effort I think, well, I can use unit 3 to provide grid feedback as it just provides 240v, and doesn't feed individual split phases. Now it kicks on and provides grid feedback, but for about 20-30 seconds and kicks off, only to kick back on again. (I know this cause I can hear the click of it turning off and the *thwonk* of the inverter turning back on, as well as my utility meter's real-time app, matching what I can hear).
Now I have 3 bad units, multiple issues (probably) with each. Is there ANYWHERE in the states that I can turn to for support? Emailing Taiwan is a pain-staking process that so far hasn't yielded any help, and it seems that I need parts to fix these things and I'll bet anything I'll never see correct replacement parts from MPP shipped from Taiwan.
I purchased MPP products since Will uses/recommends them and also states these all-in-one units ARE serviceable. I am truly out over $6000 and will have to go with other companies just to get back on solar?
Any help AT ALL is appreciated.
(also, I know the wiring is right - I'm an industrial field commissioning electrical engineer and know not to energize without
testing every wire and phase more than once before throwing breakers.)
edit: provide more clarity & spelling corrections
From the beginning one of the units (now known as unit 2) would not feedback to the grid - it saw the incoming voltage and would signal like it was going to provide grid feedback, but it never actually kicked on.
Fine I thought - my plan is to run off-grid anyways, so I turn off grid feedback on all the units. Now they are hooked up in parallel as shown in the manual, and they run just fine, with one unit (unit 1) sometimes reading slightly lower voltage than the others. Weird I think, but maybe it's because the majority of the solar is coming into unit 3, and I have some shading in the mornings on the string going into unit 1. Fast forward about 3 months and now the unit is throwing 'battery voltage low' regularly. When it does throw the error, unit 1 turns off and stops producing power... BUT THE OTHER UNITS DON'T!!! Now, this leads to all sorts of issues in my house. Every one of my (15+) AFCI breakers are ruined since now the other units are only producing what they think are 2/3's of the load. After replacing with standard breakers, whenever this happens my house voltage is ALL OVER THE PLACE - this has blown out several light bulbs as well as my coffee maker. After over a month of trying to get support from MPP, they send a program for me to try and re-program the voltage reading of unit 1 so it doesn't do this. The problem? You need a serial port... this is 2022, Microsoft Windows PCs essentially removed the legacy COM ports. But on top of that, the majority of the time unit 1 is reading the proper voltage on the batteries and matches within 1 volt or so the other two units. It eventually got worse where it couldn't read proper voltage for more than about a minute or two and then it would drop from say 53 volts to 34 volts, and kick off.
Pissed off at the lack of support, I decided I would just run off the other two units until I figured out what the problem truly was. So I re-work the parallel cabling for just 2 units and find out now I have a floating neutral. I try running on both units (2 & 3) individually - the same result. So now THEY are both broken.
As a last-ditch effort I think, well, I can use unit 3 to provide grid feedback as it just provides 240v, and doesn't feed individual split phases. Now it kicks on and provides grid feedback, but for about 20-30 seconds and kicks off, only to kick back on again. (I know this cause I can hear the click of it turning off and the *thwonk* of the inverter turning back on, as well as my utility meter's real-time app, matching what I can hear).
Now I have 3 bad units, multiple issues (probably) with each. Is there ANYWHERE in the states that I can turn to for support? Emailing Taiwan is a pain-staking process that so far hasn't yielded any help, and it seems that I need parts to fix these things and I'll bet anything I'll never see correct replacement parts from MPP shipped from Taiwan.
I purchased MPP products since Will uses/recommends them and also states these all-in-one units ARE serviceable. I am truly out over $6000 and will have to go with other companies just to get back on solar?
Any help AT ALL is appreciated.
(also, I know the wiring is right - I'm an industrial field commissioning electrical engineer and know not to energize without
testing every wire and phase more than once before throwing breakers.)
edit: provide more clarity & spelling corrections