Hi All,
I've got a client who is thinking of getting a heat pump hot water heater.
Wanted me to confirm that it would save him kwh per year over a standard tank
unit.
Yes it will, or so all the numbers say for his area etc.
But I cannot figure out ( or find out) how to compare the energy factor
The cycling I referred to is just the normal load cycling of the charge
controller raising the voltage each day to the absorption voltage and then the
voltage slowly dropping over the night, along with the battery's self
discharge. It's not a lot, so the 5% side includes an inverter in search mo
Hi Ray,
With no inverter in the system and all the loads turned off do you think the
batteries are really cycling that much? Yes your scenario's sound familiar.
My favorite is a load is left on, the charge controller turns off most, but
maybe not all the loads with the LVD, but the battery k
Fellow wrenches,
If anyone happens to have a Mitsubishi MF170 that is available, please
contact me off list. I need one to add to a customer's small system.
--
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
___
Li
The batteries in your scenario are actually being cycled daily probably
somewhere in the 2 to 5% range. Looking at a chart for # of cycles vs. DOD,
you see the most efficient use of the battery is usually from 20% to 80% DOD,
an FLA battery in perpetual float just doesn't last as long you migh
Hello John,
Thank you for your helpful explanation. I wonder if there should be a "six"
life, that being time.
Lets use the small summer cabin analogy that gets used for one month a year.
Let's say the system has Four T105 -RE's, 500 watts of PV, 4 average daily sun
hours. They do one disc
Hi Larry,
I am not talking about doing a discharge to 90% DOD, I was talking about doing
a discharge to 20% DOD. Let's say summer folk come up for 1 month a year, and
discharge to 20% DOD daily, then fully recharge with a 2 hour absorb charge
and then float until the sun goes down. This sy
350+ installed, 5 replacements over a 2 year period (.02%). 1-190, 4-215,
0-210 (we use Sanyo on many residential systems)
accessibility built in to design is also a plus - not always possible, but
should be a factor when doing layouts.
Holt E. Kelly
Holtek Fireplace & Solar Products
500 Jewe
Troy:
Of the 100 or so Enphase inverters we have seen 2 fail. I have my fingers
crossed.
Wm
PS:
Xantrex GT: About 15% failure
SMA SB: About 15% failure
Fronius: 300% failure rate
wm
At 01:02 PM 7/5/2012, Troy Harvey wrote:
I'm wondering how many of you have had Enphase failures in the
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