Jay mentions a topic that I've had a question about. Has anybody AC-coupled
an induction generator (wind or hydro) with a conventional battery based
inverter? On the surface it seems that it would work fine as long as there
were appropriate means included in the design to avoid over-charging the
Hi Keith,
Sorry about #4, should have said " pumped storage just isn't practical
for small systems.
So the long version is that to get away from batteries, you would need
whats called an AC direct hydro.
This hydro would power the AC loads directly, no inverters, no
batteries.
What gets t
They can be a challenge but all seem to come from the same manufacturer and
meet the same spec, with out the wrench it can drive you nuts getting them
apart. But it's not easy with the wrench sometimes either.
Bob
On Tue, Aug 25, 2009 at 3:09 PM, Jeff Yago wrote:
> Like most of you it seems li
Like most of you it seems like every time I turn around, we need to order another $400 crimper and toss out several boxes of connectors that no mate with the module cables.
Although I realize these connectors are not intended to be repeatedly plugged and un-plugged, there are times during the i
The early Siemens solar kits came with a heavy Gage plastic box that mounted on
an "S" bracket tucked neatly under the panel...It worked well
Max Balchowsky
SEE Systems
760-403-6810
From: Drake Chamberlin
To: RE-wrenches
Sent: Tuesday, August 25, 20
Hello David
Yes, I know it was, just wanted to see if you were paying attention :)/. I
recall it was 1993. (Great tour, property, family and environment. Still have
the pictures!)
Yes, the levelized cost of electricity, when computing a host of variants, it
seems a pumped hydro opportunity can
Jay
Ok
How about the long version?
Can you also elucidate on # 4?
Regards
Keith
From: jay peltz
To: RE-wrenches
Sent: Monday, August 24, 2009 3:11:41 PM
Subject: Re: [RE-wrenches] Solar and pumped hydro
Hi Keith,
I get this question a lot.
1. Best
In a message dated 8/25/2009 6:43:33 A.M. Pacific Daylight Time,
m...@oasismontana.com writes:
maybe on the utility scale, but not on the micro-hydro scale.
Not really, Or only if you have free power to dump. Pge uses pumped storage
in their system in California but relies on night
I'd had this question a while ago, and thought I'd send a few links I
found last year in case they're helpful for anyone.
http://www.renewableenergyworld.com/rea/news/article/2008/03/pumped-storage-to-back-up-renewable-energy-51745
from that page:
1994 IEEE Study on reservoir size requirements (
Hans,
The 2002 NEC 352.12D states that RNMC can't be used where ambient temps
exceed 50C unless listed otherwise. Most of the PVC we see is listed
otherwise, max 90C right on the conduit.
Jeff
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun..
It is almost impossible in a normal installation to get a totally waterproof
enclosure.
What you describe with the flooded box is more common than people might think.
What causes most of that is condensation. Humid air gets sucked into the
enclosure at night or whenever else it cools off. The
I am getting more convinced that there is no such thing as a water-tight electrical enclosure, regardless of gasket covers and sealed openings. We always drill a very small "weep-hole" in the bottom of an enclosure. We have found this is too small to allow insects to enter, but will drain any le
Keith,
This has been a novel idea that I have heard many times lately, but it just
does not pencil out--maybe on the utility scale, but not on the micro-hydro
scale.
Take for instance my micro-hydro scenario. I have a 75 head with a Stream
Engine at the bottom with two ½ nozzles. When both noz
You can get metal NEMA 4 and NEMA 12, gasket sealed boxes made by
Hoffman. There should be no deformation issues. The only possible
issue could be the temperature of the gasket, but it would be held in
place by the clamped cover. Have the gaskets had an issue with the
deformed PVC boxes?
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