Repost please: $1/watt solar panals.
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From: daestrom on 30 Oct 2009 16:28 Josepi wrote: > Ten years from batteries? Not if you actually used them and didn't just > keep them on float. > > I have heard this story over and over from manufacturers but I have not > heard of anybody, actually using their batteries and discharging them each > night to a resonable level, that gets more than a few years of dependable > usage out of them. > > The solar savings would never pay for the batteries, compared to bulk > manufactured energy > > Well, these aren't exactly 'cheap', but are guaranteed for 3300 cycles. If you discharge/charge about 1/2 a cycle per day and immediately recharged it, that 'should' last 6600 days that would be 18 years. Problem is, solar applications are more like discharge 30%, wait 8 hours, charge 20%, discharge another 30%, wait 8 hours charge 25%, etc... That kind of 'cycle' is pretty hard on any battery. http://www.affordable-solar.com/surrette.battery.2v.1700.ah.2-ks-33ps.htm daestrom
From: wmbjkREMOVE on 30 Oct 2009 20:42 On Fri, 30 Oct 2009 16:28:21 -0400, daestrom <daestrom(a)twcny.rr.com> wrote: >Josepi wrote: >> Ten years from batteries? Not if you actually used them and didn't just >> keep them on float. >> >> I have heard this story over and over from manufacturers but I have not >> heard of anybody, actually using their batteries and discharging them each >> night to a resonable level, that gets more than a few years of dependable >> usage out of them. >> >> The solar savings would never pay for the batteries, compared to bulk >> manufactured energy >Well, these aren't exactly 'cheap', but are guaranteed for 3300 cycles. http://www.affordable-solar.com/surrette.battery.2v.1700.ah.2-ks-33ps.htm >If you discharge/charge about 1/2 a cycle per day and immediately >recharged it, that 'should' last 6600 days that would be 18 years. > >Problem is, solar applications are more like discharge 30%, wait 8 >hours, charge 20%, discharge another 30%, wait 8 hours charge 25%, etc... That scenario should only be happening during multiple-day dark periods. For typical installations, the rest of the time the routine discharge should be less. To make the math easy, figure 4 days supply and 20% reserve. Which makes a sunny day's dark-period discharge perhaps half of a day's consumption - 10%, then back to full by early afternoon. It depends on the owner's habits though. If they tend to leave early for work and arrive home late, and had no daytime loads, then most or perhaps all the consumption might make a trip through the batteries. Then I could see how it could come close to your scenario, in winter at least. >That kind of 'cycle' is pretty hard on any battery. I think that's what's worse are setups where the batteries get deep-discharged, and then on the first sunny day it's charge back to 50%, discharge back to 30, charge to 60, back to 40 etc. I've seen that scenario a lot, and when you combine it with (most) owners who don't have a convenient way to gauge battery charge level, it's easy to see how some installations have short-lived batteries. I really lean on people to get and use battery meters. Then they can see right away if their full-charges are too infrequent. Wayne
From: Josepi on 31 Oct 2009 00:12 Yup when the battery meter says dead for the whole of December 'cause the sun has been cancelled my batteries are really gonna' last for 20 years, like yours do (try to convince us you are real). Let's face it, you think you are gifted in the alternative energy department and in a few other ways. We doubt you would be able to get away with your bullshit in a real environment where you have to actually provide energy to live from and not just play Superman online. <wmbjkREMOVE(a)citlink.net> wrote in message news:tr1ne5lp47ijkpekt61issdb57oqjoho4v(a)4ax.com... > I think that's what's worse are setups where the batteries get > deep-discharged, and then on the first sunny day it's charge back to > 50%, discharge back to 30, charge to 60, back to 40 etc. I've seen > that scenario a lot, and when you combine it with (most) owners who > don't have a convenient way to gauge battery charge level, it's easy > to see how some installations have short-lived batteries. I really > lean on people to get and use battery meters. Then they can see right > away if their full-charges are too infrequent. > > Wayne > On Fri, 30 Oct 2009 16:28:21 -0400, daestrom <daestrom(a)twcny.rr.com wrote: >>That kind of 'cycle' is pretty hard on any battery.
From: nospam on 31 Oct 2009 09:27 Josepi wrote: > Yup when the battery meter says dead for the whole of December 'cause the > sun has been cancelled my batteries are really gonna' last for 20 years, > like yours do (try to convince us you are real). > > Let's face it, you think you are gifted in the alternative energy department > and in a few other ways. We doubt you would be able to get away with your > bullshit in a real environment where you have to actually provide energy to > live from and not just play Superman online. > Most anyone with a serious pv setup have a back up genny to recharge batteries in time of low sunshine, so your argument is pretty much bull...........
From: Joseoi on 31 Oct 2009 12:03
So your 20 years batteries would sit completely exhausted for the whole month of Decemebr and part of January? Maybe get rid of the Superman costume and come back to earth. Possibly give that braincell back to Steve and let him spam the group on his own too. <nospam(a)nevis.com> wrote in message news:4aec3ae4$1(a)news.x-privat.org... > Josepi wrote: >> Yup when the battery meter says dead for the whole of December 'cause the >> sun has been cancelled my batteries are really gonna' last for 20 years, >> like yours do (try to convince us you are real). >> >> Let's face it, you think you are gifted in the alternative energy >> department and in a few other ways. We doubt you would be able to get >> away with your bullshit in a real environment where you have to actually >> provide energy to live from and not just play Superman online. >> > > Most anyone with a serious pv setup have a back up genny to recharge > batteries in time of low sunshine, so your argument is pretty much > bull........... |