Re: [RE-wrenches] Inverter back feed liability

2015-11-24 Thread Jay
Hi drake, My follow up question would be, how many inverters are there up and running at this point? Jay > On Nov 24, 2015, at 6:34 AM, Drake > wrote: > > Is there any any recorded case to date of a UL 1741 inverter backfeeding the > grid and

Re: [RE-wrenches] Odd battery problem - very low SG in only one cell

2015-11-24 Thread Dan Fink
Thanks everyone for the replies and ideas both on and off list. Based on your input, next week when the system is in Float I plan to have the class isolate the faulty battery and measure voltage, let it rest for a couple days, then load test at about C/10. Predicted result is that it will show

Re: [RE-wrenches] Odd battery problem - very low SG in only one cell

2015-11-24 Thread Drake
Having one cell die seems to be an emerging pattern. At 09:49 AM 11/22/2015, you wrote: Esteemed Wrenches; I'm looking for input on what could be going on with a battery bank at the college I teach for. It's a stand-alone system with 4 Trojan 12v T-1275 in series / parallel for 24v, 660w

Re: [RE-wrenches] Inverter back feed liability

2015-11-24 Thread Drake
Is there any any recorded case to date of a UL 1741 inverter backfeeding the grid and causing harm? At 05:27 PM 11/23/2015, you wrote: Gary: Here in the North Texas area, for the Oncor TDSP (Transmission and Distribution Service Provider), an 8-page Interconnection Agreement (IA) is

Re: [RE-wrenches] Inverter back feed liability

2015-11-24 Thread Jason Szumlanski
Hahaha. Here in Florida where everyone is a retired something, everyone is an engineer, doctor, or lawyer, or they slept at a Holiday Inn Express last night. On a serious note, the way I usually handle engineers is to ask their particular area of work. Understanding whether they are focused on

Re: [RE-wrenches] Inverter back feed liability

2015-11-24 Thread Bill Loesch
Hilton, Would not an appropriate (and respectful) rejoinder be, "Why are you coming to me?" Your experience and expertise beyond Physics 101 may be primary driving reasons. A long time ago, I think it was Dave P. who shared he talked to a potential customer for a half hour for free, after