Had the RISO fault come up on a Power One Aurora with the turbine last autumn Andy. The man fitted an isolation transformer on the ac grid side... All good ever since fingers crossed.👍
Jim, Interesting, I tried an Aurora inverter on this system when the fault was active and it showed a RISO fault and low ohms. All good background info, cheers
when you power on a power one 5000/6000 outd-us inverter. It will show you a riso value say 20M ohm. But during the day this value will decrease. Should this happen. I would think the resistance would be the same all the time.
I guess the underground cable has joints which have got damp Andy ? In other words - this earth leakage hasn't occurred in a single uninterrupted piece of underground cable has it ? Dave.
Dave, DC is such sneeky stuff, yes there was a joint in a conduit with 5 layers of overlapping shrink insulation. This is fine for 50v DC and it has been fine for 250v DC for a year or so, but no longer. By your question you know the way I think, cheers
Dave, interesting update, the new (from the roll) white cable produced the isolation fault after it had stayed in the damp grass overnight. I lifted it out of the grass and sat it on a series of plastic water barrels. The fault then went away, so correct double insulated solar cable for high voltage DC (285v). This is probably the problem with the underground cable that only came to light after all this recent rain, cheers.
@@TheInfoworks I wonder if that SMA inverter has gone too sensitive to leakage faults or something ? I think you have 250vdc in that cable, I find it hard to believe there's really much leakage current to ground from a new piece of cable, just sitting in damp grass ... I wonder how you got around this with your other panels/inverters - are they just at a lower voltage in the cable maybe ? Cheers, Dave
Dave, could well be a bit sensitive but I have had a similar problem with a Solar River where I used the yellow site cable for the DC from 7 panels, raised the cable off the ground and problem went away, so who can tell. Previosly I have used armoured cable and that is marked up to 1000v and double insulated from the armour layer, cheers
Had the RISO fault come up on a Power One Aurora with the turbine last autumn Andy. The man fitted an isolation transformer on the ac grid side...
All good ever since fingers crossed.👍
Jim, Interesting, I tried an Aurora inverter on this system when the fault was active and it showed a RISO fault and low ohms. All good background info, cheers
when you power on a power one 5000/6000 outd-us inverter. It will show you a riso value say 20M ohm. But during the day this value will decrease. Should this happen. I would think the resistance would be the same all the time.
Hi, resistance will change with temperature, cheers
Sir,
SMA company 25kw solar system inverter not work
Seen display grid fault error
Whats problem sir
Can you say me sirr
Is there mains power at the inverter? cheers
@@TheInfoworks
Yes sir
To dc strings is ok and grid supply ok
But inverter section not working
Display seen grid fault error
I guess the underground cable has joints which have got damp Andy ? In other words - this earth leakage hasn't occurred in a single uninterrupted piece of underground cable has it ? Dave.
Dave, DC is such sneeky stuff, yes there was a joint in a conduit with 5 layers of overlapping shrink insulation. This is fine for 50v DC and it has been fine for 250v DC for a year or so, but no longer. By your question you know the way I think, cheers
Dave, interesting update, the new (from the roll) white cable produced the isolation fault after it had stayed in the damp grass overnight. I lifted it out of the grass and sat it on a series of plastic water barrels. The fault then went away, so correct double insulated solar cable for high voltage DC (285v). This is probably the problem with the underground cable that only came to light after all this recent rain, cheers.
@@TheInfoworks I wonder if that SMA inverter has gone too sensitive to leakage faults or something ? I think you have 250vdc in that cable, I find it hard to believe there's really much leakage current to ground from a new piece of cable, just sitting in damp grass ... I wonder how you got around this with your other panels/inverters - are they just at a lower voltage in the cable maybe ? Cheers, Dave
Dave, could well be a bit sensitive but I have had a similar problem with a Solar River where I used the yellow site cable for the DC from 7 panels, raised the cable off the ground and problem went away, so who can tell. Previosly I have used armoured cable and that is marked up to 1000v and double insulated from the armour layer, cheers