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> 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> 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> 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 >> >> 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 >> >> 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 >> >> _______________________________________________ >> 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 >> >> _______________________________________________ >> 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 >> >> _______________________________________________ > 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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