Aloha Wrenches:
I have been surprised how much equipment has been failing in and out of
warranty.
- I have recently been put in the unfortunate situation of
replacing Sunny Boys that have been dying just out of warranty
- I just placed the 50th dead BP module into my module graveya
Joel:
The PV system in Long Beach was built within a stone's throw of a twin
smoke stack for a big furnace devoted to a "Trash to Energy" project. It
burns garbage to produce energy and LA has plenty of trash. Combine that
with all of the diesel soot being generated by ocean long haul
I agree with that for floating flooded, wet cell lead antimony batteries... but
flooded lead calcium cells are a more appropriate choice for floating banks on
grid ties with backup. No cycling is necessary.
Todd
On Thursday, June 10, 2010 12:32pm, "Bell, Steve" said:I
also agree with Ray’s c
On Jun 10, 2010, at 7:57:53 AM, "Kelly Keilwitz, Whidbey Sun & Wind"
wrote:
PV Watts VASTLY underestimate PV production in our area.
PV Watts underestimates in Central Ca too.
Don
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On Jun 9, 2010, at 10:47:43 AM, "August Goers" wrote:
maybe Xantrex has fixed it by now?
Unlikely, since I continue to replace several sites a 2nd and in one case three
times.
Don L
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PVWatts is a good general estimator when you fine-tune the derate factor. For
single crystal and multicrystalline arrays, I generally use 0.65 for
battery-based PV and inverter systems and 0.82 for batteryless inverter
systems. PVWatts annual results are l5% low for Unisolar arrays because PVWat
HI Mick,
The Concorde Battery web site has a great technical manual worth
checking out;
www.sunxtender.com/pdfs/Sun_Xtender_Battery_Technical_Manual.pdf
It would sound like the this battery bank mostly operating at an average
daily DOD (Depth of Discharge) of about 10% and that daily load w
Mick,
To calculate the lifetime amp-hrs, as you wanted, you first have to have the
Cycle Life vs. DOD (depth of discharge) info for your battery, then multiply
the cycles at your proposed DOD, by the amp hrs rating of the battery by the
DOD% (cycle # x battery AMpHr x DOD%)
One thing I can t
Greetings, fellow Energy Techs~
A client has a nice new set of 2v Concorde AGM sealed batteries: 915 amp
hours in one 24 volt string. His cabin is often unoccupied with only the
refrigerator running. During those "idle" days the battery is called upon to
deliver an average of 90 amp hours every ni
Thanks, Don,
Performance predictions such as from PV Watts VASTLY underestimate PV
production in our area. For example, PV Watts estimates 940 kWh/kW for
a 4:12 pitch at 180˚, whereas such systems are actually producing up
to 1300 kWh/kW (as measured by a renenue-grade production meter). We
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