HI Jerry, Most impressive.
Would you be willing to tell us which ones didn’t meet this test, if not publicly, then off list? thanks jay > On May 24, 2020, at 3:23 PM, Jerry Shafer <jerrysgarag...@gmail.com> wrote: > > Wrenches > Again not all batteries are the same, Chemistry, recharge rate or > intelligence of the BMS, l have personally tested Blue planet batteries, l > have let them sit at 100% SOC for 10 weeks, ran them at 30% SOC for 6 months, > l have performed 100% to 0% cycling up to 4 times a day. This is the same > tests l ran on a variety of Li tech batteries and BluePlanet is the only one > that survived this testing. It's ore then spec sheets and cost, it comes down > to success or failure, personally l like success and being able to pass or > fail batteries without having my customers pay the price is a good thing. > Blue Planet has 8000 cycles life and a 15 year warranty at 70% compare that > to anything out there but again that's just me. > > On Sun, May 24, 2020, 1:32 PM Darryl Thayer <darylsol...@gmail.com > <mailto:darylsol...@gmail.com>> wrote: > I have spoken with a li battery > researcher. Do not charge over 85% of battery full charge voltage and they > will last over 25 years. But go above or below bottom and trouble > > On Sun, May 24, 2020, 10:27 AM Jay <jay.pe...@gmail.com > <mailto:jay.pe...@gmail.com>> wrote: > One question I have for those more versed than me in lithium is, I’m under > the impression that having a lithium battery in float for years isn’t good > for it. Or at the very least it has to be cycled with some regularity. > > I’d like to hear data on that > > Thx > Jay > > Peltz power. > > > > > >> On May 23, 2020, at 10:08 PM, Ray <r...@solarray.com >> <mailto:r...@solarray.com>> wrote: >> >> >> I suggest starting with a very simple look at the continuous output rating >> of the battery and match that to the inverter continuous rating. This ends >> up with quite a bit more battery than you might think at first. However, if >> the customer paid the big bucks for a battery backup system, they should at >> least get enough battery to operate the inverter at its rated power. >> Anything less, I would consider poor design. The same goes for lead acid >> batteries, they just don't work well, even on grid, when the battery is >> undersized. Even lead acid batteries have maximum current output ratings >> that should at least be matched to the inverter rating. >> >> If you WERE going to under size the battery, then you should keep it safe by >> reducing the size of the inverter battery breaker as well. I know this >> "micro battery for GTB" is becoming a trend, but it doesn't mean its right. >> >> Ray Walters >> Remote Solar >> 303 505-8760 >> On 5/23/20 5:48 PM, Mick Abraham wrote: >>> Greetings, All~ Mark Frye had asked: "...with a 4000w Outback Radian, AC >>> coupled with 2000w of PV, what is the smallest Li battery I would want for >>> stable operation?" >>> >>> Mick's reply: In the lithium arena, one often finds the ratings in >>> kilowatt-hours rather than in amp-hours. This is an easy conversion for us >>> energy nerds to make, so below I'm mainly using watts & watt-hours with >>> occasional conversions to amp-hours. >>> >>> I suggest that you start with the spec sheet (of whichever brand lithium >>> battery is on your radar), & see what the manufacturer says about >>> "allowable rate of recharge". You may find that C/2 is an acceptable rate >>> with several manufacturers, Mark--much faster than what we're accustomed to >>> with typical lead-acid batteries. Let's assume: >>> >>> * ...that your AC coupled PV array crests around 1800 watts to the battery >>> when there are no loads >>> * ...that the battery is below 100% state of charge, and >>> * ...that the solar conditions are optimal. >>> >>> Let's further assume that those conditions represent your battery's highest >>> energy rate in either direction. >>> >>> 1800w X two hours = 3,600 watt-hours dividing by 48v nominal = 75 amp-hours >>> in the above hypothetical situation. >>> >>> ++++++++++++++++++++++++++++++ >>> >>> The rate at which a battery can receive energy is (usually) also the rate >>> at which it can comfortably deplete, so let's briefly look at the flip >>> side: Assuming the battery mfr. wants the watt-hours to be no less than two >>> times the maximum wattage, a 3600 watt-hour (C/2) battery should not be >>> depleted faster than 1800 watts. Your 4kW Radian, Mark, could exceed that >>> if the loads demand it--& maybe your loads don't. Motor starting surges >>> should probably be part of the thinking & it wouldn't hurt to ask the >>> mfr.'s opinion about short term surges which briefly deplete the battery >>> faster than the hypothetical two hour rate. >>> >>> By approaching this question based on the battery manufacturer do's & >>> don'ts, one improves the chance of getting warranty coverage should it >>> later be needed. "What the large print giveth, the fine print taketh away." >>> >>> The Wrench List is the Bomb! >>> >>> Mick Abraham, Proprietor >>> www.abrahamsolar.com <http://www.abrahamsolar.com/> >>> >>> Landline: 970-731-4675 >>> Cell phone or for text messaging: 970-946-6584 >>> ᐧ >>> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> <mailto:RE-wrenches@lists.re-wrenches.org> >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> >>> >>> List-Archive: >>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >>> <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html> >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org <http://www.members.re-wrenches.org/> >>> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> <mailto:RE-wrenches@lists.re-wrenches.org> >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html> >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> >> >> Check out or update participant bios: >> www.members.re-wrenches.org <http://www.members.re-wrenches.org/> >> > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > <mailto:RE-wrenches@lists.re-wrenches.org> > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > www.members.re-wrenches.org <http://www.members.re-wrenches.org/> > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > <mailto:RE-wrenches@lists.re-wrenches.org> > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > www.members.re-wrenches.org <http://www.members.re-wrenches.org/> > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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