Hi Wrenches.
Can anyone recommend a good 200A Nema3 auto transfer switch that does not
need to have any generator feedback (ie. Generac version which requires
signal from generator) to transfer. Basically looking for a dumb version
which transfers based on loss of grid voltage, and then
Okay I have to ask, why wouldn’t you want to stick to code compliant battery
cabling?
From: RE-wrenches On Behalf Of
peter...@pobox.com
Sent: Tuesday, August 11, 2020 6:18 PM
To: RE-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] Ampacity Ratings for Different Conductors
I have
Jason
I replaced one a little over a year ago on a sunny island, just within the
warranty ( just ). They sent me a new one. It was just the display and it took
15 minutes to change, no new cover suggested or needed. I suspect they have
plenty of them as they seem to fail. Press them. With
Peter,
The 210-amp rating is probably for a 105°C insulation temperature in
free air. For comparison, #2 THHN (90°C) copper in free air is rated for
190 amps. Not sure that it makes sense to use a free-air rating in a
small closed box. For outside use a temperature de-rating for ambient
I would and do use a 2/0 battery cable for a 4KW inverter. Anchor is an
excellent marine cable, but not a #2.
Dave Angelini Offgrid Solar
"we go
where powerlines don't"
http://members.sti.net/offgridsolar/ [1]
e-mail
offgridso...@sti.net [2]
text 209 813 0060
On Tue, 11 Aug 2020 15:18:22
Jeff,
This has to do with testing... it takes a lot of time to do real cycle life
testing even if you are doing accelerated testing.
Some of the Lithium manufacturers that claim 8000 -10,000+ cycles at
80-100% DOD I think are not being well you know...
I personally think they are
Yeah, it's like pulling teeth to get a response, much less an informed
response. They told me to maintain NEMA 3R rating I need a full cover
replacement. But no word on how to actually accomplish that (where to buy,
how much, if available, etc.)
On Mon, Aug 10, 2020 at 8:13 PM Chris Sparadeo
I have been designing a off-grid system that can fit in an outside-accessible compartment with an approximate 24" square footprint and space above about 18" - 24".
I am using two Battle Born LiFePO4 batteries rated at 24 V / 50 Ah, a Cotek pure sine wave inverter
Yes Richard is right. When doing these one cycle or lifetime comparisons
we should derate the rated or useful KWH figures by the round trip
efficiency:
Round Trip Efficiencies:
FLA - 82-85%
AGM - 88-92%
AGM-Carbon - 90-94%
LFP - 94%-98%
:)
jc
Richard Scott wrote on 8/11/20 10:35 AM:
Also
Jeff,
I don't have answers to many of your questions but one thing I wanted to
point out as that some lithium-ion manufacturers like Blue Planet underrate
the capacity of their batteries so they can get to the 100% DOD without
impacting cycle life. For example, Their 16 kWh battery is actually
Hi Jeff,
AES doesn’t list cycles, just the 38 MWh/10 yr warranty of which you can back
calculate cycles which works out to around 1.5 per day per 10 years.
jay
peltz power
> On Aug 11, 2020, at 11:30 AM, Jeff Clearwater
> wrote:
>
> Hey All,
>
> Great Thread - so does anyone have
Hey All,
Great Thread - so does anyone have the missing cycle life information
for the Discover AES and Fortress Eflex below?
* Discover AES (42-48-6650) (Spec sheet does not list cycles) (but
does give 38MWh warranty
see analysis sheet here:
The cost sounds accurate, considering Blues are 2.5 to 3x the cost of LG Resu's
for instance. To minimize sticker-shock, remember they are rated for 8000
0-100%SOC cycles (that's 21 years daily). And certified immune from thermal
runaway.
I assume we are talking 48v here, not their 850v
Also keep in mind that the battery charge/discharge efficiency is much
higher for lithium batteries compared to lead acid.
Richard
On Tue, Aug 11, 2020 at 8:17 AM Jay wrote:
> Hi William,
>
> I dont do the math based on up front kwh cost, but on lifetime kWh based
> on the number of cycles
Hi William,
I dont do the math based on up front kwh cost, but on lifetime kWh based on the
number of cycles per average DOD that are going to be used. I use this same
formula to compare all batteries to each other.
Jay
Peltz power.
For example, a Rolls L16 ex has 3500 cycles at 50% DOD,
The BMS in each system will balance under charge and protect hi
discharge currents in multiple battery systems. This is typical in multiple
Li batteries. I would expect them to do this BP. I have seen this with 20
of the AES Li batts. No problems with circulating currents. I would expect
you to
Friends:
I am hoping y’all can tell me I am doing something wrong with my
arithmetic. I have registered to purchase Blue Planet batteries and priced
the product. I come up with math that indicates that comparing usable
amp/hours to usable amp/hours, that the Blue Planet is 5 times the cost of
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