Go2Guy
New Member
- Joined
- Feb 15, 2021
- Messages
- 40
the problem. when ever the mpp is on bypass mode there is no voltage on ground BUT when ever the inverter actually starts inverting power, there is 110 v in reference from the ground lug on the mpp and to the actual ground. . i am so puzzled. I was still in process of trying to diagnose this issue and had my pc connected to the USB port of the MPP and when made a change to SBU and solar priority. the second i saved the settings it instantly switched from bypass mode to inverter mode and boom, the whole dam USB cable fried and my computer INSTANTLY SHUT OFF. . . im am extremely saddened by this, luckily my drives were not damaged .. but just cant figure this out. .
This is the set up
[ i have to 2 main panels [I call them both main because they are both directly wired to the 220 main breaker outside the house and our independent of each other aka not a sub panel of the other] the newer main panel houses all the 220 devices which were moved over to it [ac , water heater etc] and the other main panel was the original panel houses the rest of the house, so the 220 only panel stays live and feed the mpp and AC while the original main panels main breaker is shut down and back fed thru the 30 amp genertor interlock. [we will call the new panel the "220 panel" and the original the original panel] both main panels have there own main breaker, are grounded to each other and carry the same neatrual [the main breaker on both of these units do not disconected the neutral]
so i have a PIP2424HSE 220v model.I have 220 coming into the unit from 220 panel] and the 220 output of the mpp connected to a power jack split phase transformer 3000w transformer . i have the L1 L2 N of the transformer wired in a 30 amp generator interlock breaker on the main panel panel . .
some side notes, when i first set the unit up I grounded everything [ground from 220 panel, to the mpp, ground from mpp frame lug to frame of transformer, and ground from the frame of transformer back to original panel. . . when inverter was on bypass mode there was no issues, but the second it went into inverter mode and it shut down and error[I thought i fried it. . . I disconnected the all grounds and it worked flawlessly, the whole house was powered with split phase 220. . . BUT just as quick test, I very quickly and lightly tapped the ground from the main panel to the ground lug on the mpp it gave a big spark this is when i new there was an issue with voltage with reference ground. . . i just dont understand how. . . if all the ground are disconnected how the hell is the 110 coming out of the ground on the mpp when 110 is not even connected to the unit the 220 comes in and 220 comes out and 110 never goes into the unit. even when the 220 in is disconnected issue still persist . as a test I held a probe of a multimeter on voltage mode and touched the the other probe to the ground lug on the mpp frame and sure enought 110 volts in reference to me aka earth ground to mpp frame ground. . . so the question is where is it coming from , and how is getting there. . . and also remember when unit goes to bypass mode the issue disappears while the transformer is still working in converting the 220 only its receiving into 110 split phase.
here all the tests I did. . .
set to bypass mode, issue disappears
Disconnected the 220 input to unit, issue still persist
disconnected transformer issue disappears
connected transformer BUT disconnected from transformer from house, issue disapears, this shows its not the transformer
shut off 30 amp breaker in original panel and but still had it connected to that breaker issue is still there
tried reversing the the hot and neutral from the out of the mpp to the transformer and it made no difference, issue still there
its seems that the bond between the neutral and and ground in the panel is the culprit BUT it still does not explain how when all grounds are disconnected from the set up[mpp and transformer], how 110 is making its way up backwards through the 220 output of the mpp and manifesting its self in the frame of the unit. not only that i was under the impression that these unit were designed to be connected to bonded neutrals . . also if there was some type of short would the unit read 220 in reference to ground not 110. . . . . it just makes no sense,
I would greatly apprecate any assitance
This is the set up
[ i have to 2 main panels [I call them both main because they are both directly wired to the 220 main breaker outside the house and our independent of each other aka not a sub panel of the other] the newer main panel houses all the 220 devices which were moved over to it [ac , water heater etc] and the other main panel was the original panel houses the rest of the house, so the 220 only panel stays live and feed the mpp and AC while the original main panels main breaker is shut down and back fed thru the 30 amp genertor interlock. [we will call the new panel the "220 panel" and the original the original panel] both main panels have there own main breaker, are grounded to each other and carry the same neatrual [the main breaker on both of these units do not disconected the neutral]
so i have a PIP2424HSE 220v model.I have 220 coming into the unit from 220 panel] and the 220 output of the mpp connected to a power jack split phase transformer 3000w transformer . i have the L1 L2 N of the transformer wired in a 30 amp generator interlock breaker on the main panel panel . .
some side notes, when i first set the unit up I grounded everything [ground from 220 panel, to the mpp, ground from mpp frame lug to frame of transformer, and ground from the frame of transformer back to original panel. . . when inverter was on bypass mode there was no issues, but the second it went into inverter mode and it shut down and error[I thought i fried it. . . I disconnected the all grounds and it worked flawlessly, the whole house was powered with split phase 220. . . BUT just as quick test, I very quickly and lightly tapped the ground from the main panel to the ground lug on the mpp it gave a big spark this is when i new there was an issue with voltage with reference ground. . . i just dont understand how. . . if all the ground are disconnected how the hell is the 110 coming out of the ground on the mpp when 110 is not even connected to the unit the 220 comes in and 220 comes out and 110 never goes into the unit. even when the 220 in is disconnected issue still persist . as a test I held a probe of a multimeter on voltage mode and touched the the other probe to the ground lug on the mpp frame and sure enought 110 volts in reference to me aka earth ground to mpp frame ground. . . so the question is where is it coming from , and how is getting there. . . and also remember when unit goes to bypass mode the issue disappears while the transformer is still working in converting the 220 only its receiving into 110 split phase.
here all the tests I did. . .
set to bypass mode, issue disappears
Disconnected the 220 input to unit, issue still persist
disconnected transformer issue disappears
connected transformer BUT disconnected from transformer from house, issue disapears, this shows its not the transformer
shut off 30 amp breaker in original panel and but still had it connected to that breaker issue is still there
tried reversing the the hot and neutral from the out of the mpp to the transformer and it made no difference, issue still there
its seems that the bond between the neutral and and ground in the panel is the culprit BUT it still does not explain how when all grounds are disconnected from the set up[mpp and transformer], how 110 is making its way up backwards through the 220 output of the mpp and manifesting its self in the frame of the unit. not only that i was under the impression that these unit were designed to be connected to bonded neutrals . . also if there was some type of short would the unit read 220 in reference to ground not 110. . . . . it just makes no sense,
I would greatly apprecate any assitance