Yeah the BMUs in the merit sun ones are handling equalization of the cells
inside and enforcing limit on over-current etc. It also determines how many
series/parallel ones you can have too.
The chargers are pretty basic – they are just a single-stage power supply with
a fixed current. They do typically shut off after the batteries are charged.
The problem with a lead acid charger is that they are doing constant current
until a certain voltage is hit and then switches to constant voltage for how
long it took to finish the first stage and then switch to float. The BMU would
have to do a bit of trickery to make that work and pretend to be a lead acid
battery. For reference, the charger for the 48V LiFePO4 system is a single
stage, 57.6V/20A power supply.
From: AF <af-boun...@af.afmug.com>
Date: Thursday, October 29, 2020 at 10:18 AM
To: af@af.afmug.com <af@af.afmug.com>
Subject: Re: [AFMUG] Lithium lead acid replacement batteries
I don't really know Adam. I know that multi-cell LiFePo batteries need (and
usually include) a BMU to manage the states/flow between cells, and I know that
LiFePo batteries don't want (or need) a bulk or equalization. Beyond that, I
think they just need a different charger, but I don't know how sophisticated it
needs to be.
bp
<part15sbs{at}gmail{dot}com>
On 10/28/2020 3:12 PM, SmarterBroadband wrote:
Hi Bill
I thought with the drop in replacements the BMU handled the charging?
From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Bill Prince
Sent: Wednesday, October 28, 2020 12:37 PM
To: af@af.afmug.com<mailto:af@af.afmug.com>
Subject: Re: [AFMUG] Lithium lead acid replacement batteries
LiFePo (Lithium Iron Phosphate) is considered very safe. Completely different
charge profile vs lead acid though.
bp
<part15sbs{at}gmail{dot}com>
On 10/28/2020 12:32 PM, Steve Jones wrote:
my biggest concern with lithium is im a dolt and dont know for sure which
variants arent prone to explode
On Wed, Oct 28, 2020 at 2:11 PM TJ Trout
<t...@voltbb.com<mailto:t...@voltbb.com>> wrote:
https://batteryhookup.com/<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbatteryhookup.com%2F&data=04%7C01%7C%7C2a594395149c49c6172e08d87c1ddaf0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637395814946292325%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=5jvqBPBDQDH%2FVIputDcthcpkZwjxjD2hE81zdaouM9w%3D&reserved=0>
On Wed, Oct 28, 2020 at 10:11 AM Harold Bledsoe
<hrbled...@outlook.com<mailto:hrbled...@outlook.com>> wrote:
I’ve used the Merit Sun batteries for other applications. They work well and
have a BMS. That said, they cannot be used with a lead-acid charging profile.
Another option would be to disable the charger on the UPS (if possible?) and
use a separate LiFePO4 charger for the batteries. That will give you more
options.
From: AF <af-boun...@af.afmug.com<mailto:af-boun...@af.afmug.com>>
Date: Wednesday, October 28, 2020 at 11:44 AM
To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com<mailto:af@af.afmug.com>>
Subject: [AFMUG] Lithium lead acid replacement batteries
Is anyone using Lithium replacements for lead acid it there UPS setups. Our
standard setup is 4 12v 100 amp hour external batteries on APC or Alpha UPSs.
I read that some of the LiFePO4 12v Lithium batteries are drop in replacements
for lead acid. Are all with built in BMUs considered drop in?
Any one doing this? What make and model have you used. Price? Also
interested to hear if anyone has purchased though Alibaba? Prices look good,
but are they too good to be true?
--
AF mailing list
AF@af.afmug.com<mailto:AF@af.afmug.com>
http://af.afmug.com/mailman/listinfo/af_af.afmug.com<https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Faf.afmug.com%2Fmailman%2Flistinfo%2Faf_af.afmug.com&data=04%7C01%7C%7C2a594395149c49c6172e08d87c1ddaf0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637395814946302321%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=KYc7%2FBIDO%2BvA2QW5MqZgYIdE3NkJGEJfQcb7wszRn1Q%3D&reserved=0>
--
AF mailing list
AF@af.afmug.com<mailto:AF@af.afmug.com>
http://af.afmug.com/mailman/listinfo/af_af.afmug.com<https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Faf.afmug.com%2Fmailman%2Flistinfo%2Faf_af.afmug.com&data=04%7C01%7C%7C2a594395149c49c6172e08d87c1ddaf0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637395814946302321%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=KYc7%2FBIDO%2BvA2QW5MqZgYIdE3NkJGEJfQcb7wszRn1Q%3D&reserved=0>
--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
