Something to think about is that LiFePO4 is good to 100% DOD, whereas we should all be keeping lead-acids above 50% DOD if we want lifespan.. So 460Ah lifepo4 = 920Ah lead-acid in my mind..
Peter Kranz www.UnwiredLtd.com Desk: 510-868-1614 x100 Mobile: 510-207-0000 pkr...@unwiredltd.com -----Original Message----- From: AF <af-boun...@af.afmug.com> On Behalf Of Ken Hohhof Sent: Wednesday, January 03, 2024 4:57 PM To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com> Subject: Re: [AFMUG] -48v power plant Of course the algorithms will be showing us all ads for LiFePO4 batts now. I got one the other day for this one: https://www.epochbatteries.com/products/12v-460ah-lifepo4-battery-ip67-heate d-bluetooth-victron-comms 12V 460Ah in an 8D size. What some people call a "truck battery". That's a lot of Ah. We have some 10+ year old old 8D AGMs I think they are rated 225 Ah. Heavy suckers. Just hauling them to the recycler at EOL is a chore. -----Original Message----- From: AF <af-boun...@af.afmug.com> On Behalf Of Peter Kranz via AF Sent: Wednesday, January 3, 2024 5:31 PM To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com> Cc: Peter Kranz <pkr...@unwiredltd.com> Subject: Re: [AFMUG] -48v power plant Yes you poll each unit. Each battery in the string has a Battery ID set by dip switches. If you have a compatible inverter/charger it polls each battery to pull data points of interest. Take a look at this battery, it supports CANBUS, RS-485, and chaining batteries with battery ID's set by dip switch. https://signaturesolar.com/eg4-ll-s-48v-100ah-server-rack-battery/ Peter Kranz www.UnwiredLtd.com Desk: 510-868-1614 x100 Mobile: 510-207-0000 pkr...@unwiredltd.com -----Original Message----- From: AF <af-boun...@af.afmug.com> On Behalf Of Ken Hohhof Sent: Wednesday, January 03, 2024 2:57 PM To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com> Subject: Re: [AFMUG] -48v power plant It's kind of an awkward situation. Suppose you have 4 batteries total, each with their own internal BMS. Do you want to monitor each battery? Maybe. My first impression is no. But perhaps knowing that battery #3 has a problem would be a good thing, like your car telling you all the tires are at 34 psi except front right is at 26 psi. Chuck's forklift probably just has one battery (and no SNMP). -----Original Message----- From: AF <af-boun...@af.afmug.com> On Behalf Of Bill Prince Sent: Wednesday, January 3, 2024 4:42 PM To: af@af.afmug.com Subject: Re: [AFMUG] -48v power plant Somebody could make a bluetooth to SNMP adapter/converter or something. Nah, that would be too hard. bp <part15sbs{at}gmail{dot}com> On 1/3/2024 2:37 PM, Peter Kranz via AF wrote: > There are rack mount LiFePO4 batteries with other options than Bluetooth. > RS232, RS485, and HTTP/SNMP are available with LiFEPO4 batteries built > in BMS systems.. The HTTP/SNMP ones are the hardest to find, pretty > much all support RS232/CANBUS. Some inverter/rectifier shelf vendors > now support > RS485 monitoring of your battery strings natively. > > Peter Kranz > www.UnwiredLtd.com > Desk: 510-868-1614 x100 > Mobile: 510-207-0000 > pkr...@unwiredltd.com > > -----Original Message----- > From: AF <af-boun...@af.afmug.com> On Behalf Of Ken Hohhof > Sent: Wednesday, January 03, 2024 12:21 PM > To: af@af.afmug.com > Subject: Re: [AFMUG] -48v power plant > > Conservatism and institutional momentum, well said. Same here. > > One issue apparently is can't charge them below 0 degrees C. But I'm > seeing ads claiming internal heaters and temperature controls. Can't > speak from experience, I just put in a bunch more AGMs. > > I also see from specs a lot about Bluetooth. I'm used to lots of > controls and stats via web and SNMP from some of the high end charge > controllers like Alpha, Eltek, ICT. How do you access the battery > control module at a remote site if it's Bluetooth? Or is that just for initial commissioning? > > ---- Original Message ---- > From: dmmoff...@gmail.com > Sent: 1/3/2024 1:25:16 PM > To: "'AnimalFarm Microwave Users Group'" <af@af.afmug.com> > Subject: Re: [AFMUG] -48v power plant > > We're still building with VRLA batteries...but that's just the > combination of conservatism and institutional momentum. I'd look seriously at LiFePo4. > For compatibility with existing rectifiers you'd look for battery > packs with a charge controller and management built in. You can then > disable the temperature comp, equalization, or whatever other > smart/fancy stuff the rectifier would do and just let it serve as a > power supply and distribution device. > > There's a devil on my shoulder telling me that with Lithium drop in > replacements with integrated controllers I can eliminate the rectifier > and just get a beefy 48V power supply and a PDU. But there's that > institutional momentum thing again. > > -Adam > > > -----Original Message----- > From: AF <af-boun...@af.afmug.com> On Behalf Of Mark - Myakka > Technologies > Sent: Wednesday, January 03, 2024 1:45 PM > To: AnimalFarm Microwave Users Group <af@af.afmug.com> > Subject: [AFMUG] -48v power plant > > Happy New Year > > I need to build a new -48v power plant. Last one I did was about 7 > years ago. I know things have changed. Any recommendations on manufacturers? > What are thoughts about LiFePO batteries vs the standard telcomm batteries? > > > -- > > Thanks, > Mark mailto:m...@mailmt.com > > Myakka Communications > www.Myakka.com > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
