Ron, There's a lot of battery-building folks out there that don't think you really need a BMS, which is a huge part of the price of LiFePO battery that includes it, especially as you get into bigger batteries. I'm one of those that decided to skip the BMS on my 200Ah DIY build (of course, my little (20Ah) Bioenno has one built-in).
First reason is that most "affordable" Chinese BMS boards are the first thing to go bad. And many of those often and eventually will. A good one is expensive and hard to find. You pay more for a Bioenno or Battleborn (and several others) because of their warranty and reputation. Second is that most of the protections you can do without, or you can find a different, cheaper, way to implement. For example, you really don't need low temp protection in the Houston area; almost any smart charger can be set to prevent an overcharge; cell balancing can be done inexpensively with ancillary equipment; and, I wouldn't spend huge bucks on a reliable BMS only to prevent an over-discharge (I bought some cheap programmable voltage indicators with buzzers used in the RC/Drone hobbies). 73, Gus K5GMB On Sun, Sep 5, 2021 at 3:08 AM Ron Bosch via BVARC <[email protected]> wrote: > Mike, > The battery has a BMS board, just doesn't have the low temp protection > sensor. Not sure of your math. mine says > $400 - 50 Ah LiFePO4 Battery > $130 - MPPT controller > $160 - 2 100W Mono Crystalline Panels (rather than 1 200W for > transportability) > $80 - Grid-tied charger > I already have a good inverter, the cabling I need, the power poles I > need, and the auto switch. I probably won't even use the inverter, since I > have a 12V charger for my laptop, so why take the RFI of an inverter for a > radio application? That will get me at least 6 hours of IC-7100 time on a > POTA activation, even if the sun isn't out, and more than enough to last 2 > or 3 days w/o sun on an ARES activation. If there is any emergency power > or decent sun, I am nearly unlimited. > > Total $770, the equivalent Solar Generator is at least $1100, $1700 if you > go Battle Born. > > Ron > KE4DRF > > > On Sat, Sep 4, 2021 at 5:09 PM Mike Lambert via BVARC <[email protected]> > wrote: > >> Hi Ron, >> >> By the time you add a charge controller and BMS to that battery you might >> as well buy a solar generator (then you get an inverter too). >> >> Mike >> KI5MIK >> On 9/4/2021 3:34 PM, Ron Bosch via BVARC wrote: >> >> With thanks to Gus, K5GMB, I recommend Will Prowse's youtube channel to >> inform y'all on solar power, as well as batteries. You can get a 50Ah >> LiFePO4 (Ampere Time or Eco Worthy) Chinese battery for <$300 on Ebay. >> They review very well for the price, with the caveat that they do not come >> with low temp circuits on the BMS, so you have to have good low temp >> protection on your charge controller to make sure you protect the cells. I >> also recommend spending less on the batteries and more on the charge >> controller. I plan on buying a Victron Blue Solar, as all of my cruising >> friends swear by them. >> >> Ron >> KE4DRF >> >> On Sat, Sep 4, 2021 at 12:21 PM KJ Anderson via BVARC <[email protected]> >> wrote: >> >>> I'd be interested in picking up a cheap battery as well. >>> >>> ------------------------------------------------- >>> KJ Anderson >>> 253-380-2636 >>> www.linkedin.com/in/scrumnerd >>> >>> -----Original Message----- >>> From: BVARC <[email protected]> On Behalf Of Westley Clavey via >>> BVARC >>> Sent: Saturday, September 4, 2021 10:04 AM >>> To: BVARC <[email protected]> >>> Cc: Westley Clavey <[email protected]> >>> Subject: [BVARC] lithium chemistry batteries for emergency power >>> >>> I subscribe to several listservers, but I believe the listing I saw was >>> here on BVARC about someone putting together a group purchase of batteries >>> that can be used to create emergency or field power supplies. My far too >>> efficient mailbox tool clears out messages after a month, so if it was here >>> I can no longer find the listing. If someone has any information on this, >>> could you send directly to me? ...no need to blast it all out again. >>> Thanks. >>> >>> [email protected] >>> >>> -- >>> Wes Clavey, W5WMC >>> >>> >>> ________________________________________________ >>> Brazos Valley Amateur Radio Club >>> >>> BVARC mailing list >>> [email protected] >>> >>> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmail.bvarc.org%2Fmailman%2Flistinfo%2Fbvarc_bvarc.org&data=04%7C01%7C%7Ce662324345aa4c18e4f608d96fb53bb8%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637663646445284969%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=kJT8o7qsF77hjHFmjUcEu%2FdH7quSRWXGfCfQtSpCQXI%3D&reserved=0 >>> Publicly available archives are available here: >>> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.mail-archive.com%2Fbvarc%40bvarc.org%2F&data=04%7C01%7C%7Ce662324345aa4c18e4f608d96fb53bb8%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637663646445284969%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=CrJcu%2FCUgWZkFGc%2BLSHli%2BLdMWp5dILoQn9UHASOaes%3D&reserved=0 >>> >>> ________________________________________________ >>> Brazos Valley Amateur Radio Club >>> >>> BVARC mailing list >>> [email protected] >>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>> Publicly available archives are available here: >>> https://www.mail-archive.com/[email protected]/ >>> >> >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing >> [email protected]http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> Publicly available archives are available here: >> https://www.mail-archive.com/[email protected]/ >> >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing list >> [email protected] >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> Publicly available archives are available here: >> https://www.mail-archive.com/[email protected]/ >> > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Publicly available archives are available here: > https://www.mail-archive.com/[email protected]/ >
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