HI Dave, A whole new world.
I didn’t realize how expensive the backwoods are, wow. There are many out there for around $1200 but not a lot in 24v. I have used many of the EG4 LL batteries, which at this point is one of the larger brands. I greatly prefer and only recommend batteries that have an active display that shows %, volts, amps, cell voltages, temperature. And I prefer ones that have a built in breaker. I don’t like ones with bluetooth as I’ve seen that fail when there is an issue and then you can’t see what’s going on as the bluetooth is down too. you’ll be really impressed once you get the hang of how differently they work. And as to size, to me its all based around days of autonomy. Is 65% enough and to what DOD are you doing that? I usually only recommend running them down to 20%, sure you can go to 10% but anything less than that you’re in the zone of how accurate the % meter in the battery is. I’m sure you’ll get a whole lot of advice, good luck jay > On Sep 17, 2024, at 9:19 AM, David Palumbo via RE-wrenches > <re-wrenches@lists.re-wrenches.org> wrote: > > Wrenches, > > I have a nice little rental house here in my off-grid neighborhood that after > 40 years is ready to transition to LiFePO4 batteries. > I have no experience with any lithium home power storage batteries. I'm > looking for advice, so I can avoid mistakes as a rental house with battery > problems is quite the pain in the ass. The last tenant was my daughter so > life with older lead acids wasn't a huge issue, but now I want something I > won't have to enter the house to monitor and operate. I'll bullet what I > think I know and my questions. > The house has four 11-year-old Trojan Industrial IND 17-6 for 925 AH @ 24V > that are amply sized for the houses loads. > It has a newer TriMetric meter that I was supposed to be able to set up for > web access using their WIFI module, but I have had no success with being able > to monitor battery state of charge remotely. > I really need something that will give me battery state of charge information > without entering the house. > The system has a single OutBack VFX3624. PV array is 2.5kW. > System also has a Iota 40A charger so charging with my 6 KW genset is > typically in the 100Amp range with the OutBack and Iota. > We are in northern Vermont, so we rack up significant generator (NOT > auto-start) run time in the winter months. > I'm looking at Eclipse LiFePO4 24V 200AH. Three of these will give me 600AH > @ 24V which is 65% of the rated Amp Hrs of the Trojan Industrials now in use. > Is this enough? > My battery box can easily handle up to four of the Eclipse 24V 200AH > batteries. I see that Backwoods recommends that only three of the Eclipse are > connected with battery cables. If I opted for four (for 800AH) I would need > to use a busbar. > Are there other distributors of Eclipse batteries other than Backwoods Solar > that I should consider? I haven't used my dealer account with them for a > number of years and I'm not sure that I'll get a good price from them. > What is the lead time for getting these batteries shipped out? > Are there other LiFePO4 batteries I should consider? > Is 600AH of LiFePO4's enough to replace 925AH of LA's? > Dave Palumbo > Retired from running Independent Power, but active in off-grid solar. > Hyde Park, VT > 802-371-8678 voice or text. > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > <http://re-wrenches.org/> > > 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> > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > <https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/> > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > <http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > http://www.members.re-wrenches.org <http://www.members.re-wrenches.org/>
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