Hi All,
I'm looking for any engineering numbers/places to look for calculating
heat transfer thru immersed heat exchangers.
IE how many BTUs can I expect to pick up/deposit to/from a tank at a
given mean water temp in the tank and X mean temp differential in the coil.
I'm trying to move beyo
Friends:
We have a client with a Xantrex XW6048 grid tied 3.4kW PV system with
battery backup,(16) Advanced Gel Cells from Power Battery.
Batteries are in an unheated garage space. The charge voltage on the gels at
78F is 57v with float at 54v. The temperature correction (according to my
charts h
Hi Gang,
For the number of ads I've seen for the product, I am surprised that there
has been no discussion of the benefits/disadvantages of this micro inverter
product.
TIA,
Bill Loesch
Solar 1 - Saint Louis Solar
314 631 1094
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Our AHJ has a list of reasons that shoot down even the thought of using
Enphase... including, his requirement for AC and DC discos on each
inverter...
Eric R. Andrews
NABCEP Certified PV Installer
Eco Solar, Inc.
Klamath Falls, OR 97601
Hi Gang,
For the number of ads I've seen for the product,
Another problem that is even more basic is the 175 watt limitation, when so
many popular panels are now in the 180 to 220 watt range, and getting larger
all the time.
..
Northern Arizona Wind & Sun -
I think we are all taking a hard look at it... and waiting for someone elses'
horror stories of new product beta testing (on a customers' roof). The fact
that I have heard no horror stories so far is a positive.
They hit SEIA hard with a big, well staffed booth. Clearly a well capitalized
com
175W is an output rating, so for most climates it will do the job. They
mentioned a slightly higher rated unit on the horizon.
--On Friday, October 24, 2008 8:33 AM -0700 "Wind-sun.com" <[EMAIL PROTECTED]>
wrote:
Another problem that is even more basic is the 175 watt limitation, when so
The only advantages I see with the Enphase inverters are decreased effects
of shading and the ability to monitor each module. Other than that, I would
anticipate increased installation time and obvious difficulties servicing
the inverters.
Orion Thornton
Independent Power Systems
NABCEP Certifi
Hi gang. Like many other manufacturers, there is an Enphase technical
representative on the list. But , manufacturer reps are here to answer tech
questions about their products. It wouldn't seem appropriate for them to chime
in on the original question posed, which was looking for Wrench comment
Wrenches,
The Enphase system meets all regulatory requirements for a utility
interactive PV system. Also, we were very careful and thorough in
making sure that it meets all NEC requirements. If you run into an AHJ
who has objections, please put them in contact with our Customer Support
peop
Greetings David,
I believe your decimal point was one tenth over from where it needs
to be. For a 48v system using the standard .067 per degree F I
calculate your absorption set-point to 59.5 vdc. Did the batteries
already see 65v? Any bulging or signs or failure yet? Was the chart
you referr
Thanks Marv (and thanks Michael W. for clarification).
Marv - could you comment on the grounding requirements? Am I correct that I
can't just daisy chain inverter chassis grounds and land at a sub-panel AC
ground bar? (and that this inverter chasis ground is in addition to the DC
module fram
Actually The other advantages I can see, are:
1) much simpler sizing of arrays. You want 5 modules, you put up 5,
you want to add 3 latter, you can do that.
You could actually do a 1 module system, that the customer could add
to as they had finances.
2) at least for small systems, the cost ad
Geoff,
Probably the easiest method is to tap into the system ground which is
already run to the module frame using an irreversible splice. Some guys
run the system ground to the inverters and then irreversibly splice a
short "pigtail" to the module. Just be sure to leave a little slack.
W
Hi Dave,
The battery charge voltage at 40F/4C should reach 58.76V I think; how
was the 66V determined?
Not sure how the battery voltage exceeded the High Batt Cut Out, is
there a charge controller in the system? - Only at extremely low
temperatures (-94F/-70C!) would you get to the 65V absorption
I was disappointed by the Enphase warranty and service support program.
I would expect something better than the industry standard 10 year warranty
for a product like this. I would take a really strong warranty and service
support agreement out to at least year 15 to inspire confidence in the
pr
Mark,
I'm surprised that you are disappointed and put so much stock in warranties.
Working with any new product and new company requires a go-slow mentality at
the start to establish a track record and field experience. A warranty is
only as valuable as the company behind the warranty. Enphase is
Mark -
Have you checked out the enphase website regarding the warranty? I think it
is clear that the warranty is 15 years, not 10 years. Check out the Enphase
details on the warranty below:
http://www.enphaseenergy.com/support/enphaseentrust/warranty.cfm
15-year Standard Limited Warranty
Enph
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