Re: [RE-wrenches] utility EDS signage

Phil, NEC 690.17 says "Where all terminals of the disconnecting means may be energized..." It would take a pretty rare malfunction of a grid connected inverter to energize the load terminals of the utility disconnect. But we have some AHJs that require this label on every ac disconnect, all

Re: [RE-wrenches] grid-tie inverters & generators

Hi Folks, We burnt up a gen set's voltage regulator on an off-grid system sunny island/sunny boy system when we took the sunny island's off-line but didn't shut off the sunny boy. So the SB backfed the genny and fried the very expensive voltage regulator on a 30 KW system. SMA had us instal

Re: [RE-wrenches] grid-tie inverters & generators

Hi Kelly It is an interesting issue and was just dicussing this the other day. I think what happens if the inverter backfeeds the genny, the generator voltage will go up, if it goes up enough, it will go outside the window of the inverter and the inverter will drop out, voltage will them r

[RE-wrenches] inverters/ generators and noise

Hi All, here is along those same lines a question about line noise. System 15kw diesel generator 4 stack outback at 24v 120v/240vac 3000 amp hr industrial batteries. when genny running, 59.5-60 hz voltage 122/244 Symptoms. when charging there is some buzzing on some electrical equipment

Re: [RE-wrenches] grid-tie inverters & generators

In a message dated 11/19/2008 5:25:30 PM Pacific Standard Time, [EMAIL PROTECTED] writes: I can imagine, if the inverter tries to sync with the inverter, that the voltage could rise, causing the inverter to disconnect, wait 5 minutes, repeat. Is there anything nasty that could happen?

Re: [RE-wrenches] grid-tie inverters & generators

At 06:24 PM 11/19/2008, you wrote: Is there any issue connecting a batteryless grid-tie PV system to the load side of a panel that is backed-up by a generator on an automatic transfer switch, when the grid is down and the generator running? It is recommended to use a relay to disconnect the i

Re: [RE-wrenches] grid-tie inverters & generators

Wrenches, I'm dredging up this subject again (previous postings 6/08) with a simple question that doesn't seem to have been answered: Is there any issue connecting a batteryless grid-tie PV system to the load side of a panel that is backed-up by a generator on an automatic transfer switch, when th

Re: [RE-wrenches] SWH data logging

What about this company? Please contact us at: Phone - 973 383 9888 FAX - 973 383 9088 Email - [EMAIL PROTECTED] Regards, Peter Johnson Istec Corporation On Tue, Nov 18, 2008 at 6:15 PM, Kelly Keilwitz, Whidbey Sun & Wind < [EMAIL PROTECTED]> wrote: > Carl, > Thanks for the info. Is dat

[RE-wrenches] Installer in Yuma, AZ

Hi Wrenches, We're looking for an installation partner for a project in Yuma, AZ. Please contact me if you can support a ~5kW grid tied installation. Thanks! Jonah Liebes General Manager C: 760.908.7308 P: 951.677.7755 NABCEPT Certified HelioPower - Solar

Re: [RE-wrenches] radiology equipment and inverters

We have a Fronius inverter system located on the interior wall of the garage next to our offices. When I get in my car or truck parked outside, and I have the radio set to a strong AM station, I can "hear" the inverter over top of the radio station while parked about 20 feet away and on the opo

[RE-wrenches] Study on Panel Height and Sorting Panels

RE-Wrenches: Anyone have a study on: 1. Increasing panel height off the roof from 2" to 6" and how much output is increased. 2. Sorting panels by voltage and stringing like panels, aka as some say German installers do, to increase kWh production. Paul N. Israel, President

[RE-wrenches] Economics of physically attatched racks on flat roof

Wrenches and racking pros... I'm looking for thoughts regarding flat roof solutions.  We love the flexibility, speed and ease of ballasted solutions.  We sacrifice "perfect" or "better" tilt angle (we are typically around 35-40 north).  And most importantly, we are startting to bump into "

Re: [RE-wrenches] radiology equipment and inverters

Jerry - I have been involved with numerous hospitals powered from various inverters and I have never heard of any issues with operating radiology equipment - other than the tremendous surge requirements they often have. I would advise putting the inverter in a location some distance from the r

Re: [RE-wrenches] radiology equipment and inverters

Interesting question. I know all inverter manufacturers are regulated to run at 60hz in the US and in the case of Fronius they have less than 5% THD (total harmonic distortion). Are they concerned with issues through the air or power lines? The line should not effect it I imagine especially since w

[RE-wrenches] radiology equipment and inverters

Wrenches; We're talking to a customer who is a hospital and the question came up; can inverters interfere with radiology equipment or vice-versa? Anyone know the answer to this? Any input is appreciated. Jerry Caldwell Recurrent Energy ___

Re: [RE-wrenches] CA CSI warranty interpretation

Aram, We requirements imposed by two seperate authorities. The obligations of contractors to stand behnd their works flows for state contracting laws (generally one year or as specified contractually). The obligation to insure power production at 85% of rated capacity for 10 years flows from

Re: [RE-wrenches] utility EDS signage

Hi Phil, Four out of the six of utilities that we deal with here in Arizona require an external AC disconnect, and yes, we do install the plaque. About half of the utilities explicitly require it, the other half don't. I agree that is a confusing label, possibly leading service personnel to

Re: [RE-wrenches] CA CSI warranty interpretation

Re: [RE-wrenches] SWH data loggingGood day folks, In California, as a Lic. Contractor you are responsible if you make changes to an existing structure. Now if you were to sub out the roof penetrations to a Lic. roofing contractor you could pass that responsibility to them. But you as the Solar

Re: [RE-wrenches] Request for 130watts solar module.

We have been getting a lot of these suspicious inquiries from Seattle, WA. The same or nearly the same address; asking for 130W modules, payment terms, awkward syntax, etc. We did a bit of aerial/sat imaging and together with some other info, we have determined that this outfit and several others i

Re: [RE-wrenches] CA CSI warranty interpretation

August, I don't have connections very high in the CSI groups, but last year I asked a PG&E CSI Project Manager about this. I asked what their position would be if water was leaking into the living room but the meter was running backwards. He replied that such a situation would not be the conc

[RE-wrenches] CA CSI warranty interpretation

Hi California based Wrenches, I'm wondering how you folks are interpreting the CSI (California Solar Initiative) warranty requirements (section 2.4 of the CSI handbook). Here is a quote from section 2.4: "Currently, all systems must have a minimum 10-year warranty provided in combination by

[RE-wrenches] utility EDS signage

Wrenches, Our utilities require an external AC disconnect between the inverter and the point of interconnection, located next to the meter. In the past, we have marked this switch with the language in 690.17 (although no AHJ or utility has required it). Because we generally argue against the nec