Re: [RE-wrenches] Efficiency Curves of Fronius Inverters?

I have a decidedly skeptical opinion of the Fronius MPP algorithm. A few years ago, I was one of the first (I believe) to notice a curious "continuous saw tooth ramping" of the DC current and voltage on a couple of Fronius IG4000's. The problem (I was told by Fronius) was triggered by an increasing

Re: [RE-wrenches] Efficiency Curves of Fronius Inverters?

Efficiency Curves of Fronius Inverters?Some of the early (circa 2000'ish) grid tie inverters (not just Fronius) had problems tracking MPPT at the lower 10-15% or so of the input voltage range. Not sure if that is related to the experience you had with that IG4000 or not. ..

[RE-wrenches] xw xan buss cable lengths

Hi All, Does anyone know the max cable length for the xanbus? thanks, jay peltz power ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches

Re: [RE-wrenches] xw xan buss cable lengths

Jay: I installed an SCP 200 cable feet from the inverters. Wm At 08:40 AM 7/9/2009, you wrote: Hi All, Does anyone know the max cable length for the xanbus? thanks, jay peltz power ___ ___ List spons

Re: [RE-wrenches] xw xan buss cable lengths

Hi Jay, The "official" length limit is 130ft (40m), but we have lots of systems running at 200ft+ without problem. As long as the inverters and charge controllers are close together a long run to an SCP or AGS should be fine. Cheers, Mark Mark Edmunds, P.Eng. Senior Director Engineering New

Re: [RE-wrenches] Kohler 8.5 RES

My dream! I hope someone knows of such a unit, cuz I'd love to know what to recommend to folks. Todd On Monday, July 6, 2009 9:16am, "Drake Chamberlin" said: Thanks to all who have helped with this. The moving target ofgenerator function makes things a bit more complicated than we wouldwish,

Re: [RE-wrenches] Roof Loading request for help

The problem here it about 5 years ago they upped the snow loadrequirements from 40 to 60 p/sf so ANY thing added to the roof needs astructural upgrade. Todd On Tuesday, July 7, 2009 9:59pm, "Bill Brooks" said: Allan, Check out my website at [http://www.brooksolar.com/services] www.brookso

Re: [RE-wrenches] Efficiency Curves of Fronius Inverters?

Peter, All of the events I saw were similar to each other and different from your experience. What I saw was the inverter operating 40Volts above Max Power Point (MPP) (it was at 330V when it should have been at 290V). This caused the inverter to operate at 90% of what a properly operating inve