Cheap 4kwh LiFePO4 batteries from Batteryclearancewarehouse
- Thread starter batteryclearinghouse
- Start date
ghostwriter66
"Here - Hold my Beer"
I'm with you .. seems a little bizarre that all these ppl are building this and that and no one has actually determined if there is any life left in these batteries or not ... Trust me - the Chinese is not going to be swapping out virtually anything that has any life left in it so will be interested to see a real storage or capacity test done ... These guys that are simply taking a voltage reading and saying its all good obviously are NEW to LiFePO4s ...
Freddmc
New Member
Am I correct in assuming that using these 24 volt batteries to power a 12volt load(rv is 12 volt) you would get double the amp hours. What would you use to reduce voltage from 24 to 12 volts. Is there a power loss in the reduction.
This would allow me to charge up the batteries at home and go camping for a week or two without having to recharge(i.e. solar) the batteries.
Thanks
Fred.
This would allow me to charge up the batteries at home and go camping for a week or two without having to recharge(i.e. solar) the batteries.
Thanks
Fred.
ghostwriter66
"Here - Hold my Beer"
So - and yes we are just guessing - but these batteries could already have had 2000 cycles if they cycled daily for the last 5 ... once again why a load/capacity test will be vital ..
ghostwriter66
"Here - Hold my Beer"
Initially there are (8) 3.2v 200aH batteries (when brand new) attached in series to give you 25.6V 200aH. When you get the battery module you need to seperate 4 of them out of series THUS giving you 2 banks of four 3.2V 12V 200aH batteries .. then put those 2 banks in parallel giving you 12v 400aH ... does that make sense? You can actually simply break up the 8 modules into four by taking off one of the buss bars ... BUT there would be no power loss per se running it at 12V 400aH or 24V 200aH
ghostwriter66
"Here - Hold my Beer"
WHERE are you seeing that?? Is that actual test or assumptions?? Did they actually do a load test?
trust me I hope they test out well! I only purchased one and have no way to do a load test and I am one of those people who are new to lifepo4. that is why I am here, we have to go solar as it is economically unfeasible to bring in grid power to our property so either run a genset or go solar. If they test out good, my storage problem will be solved. I am thankful there are people here that are testing these who actually purchased them.
ghostwriter66
"Here - Hold my Beer"
hmmm - 130aH for a 200aH battery seems to be going in the wrong direction ... if the battery was only capable of 0.5C then OK .. but assuming if these modules were used on a solar farm that we should be looking at 2C (once again I am only going by what ppl have posts as to what these moduels were originally used for)
batteryclearinghouse
New Member
- Joined
- Dec 9, 2019
- Messages
- 47
Please do not cut the green bands/straps unless your plan is totally disassemble the units down to the individual cells.
There is a video online of someone ( Dan ) who went through a complete breakdown if your want to see all the bits...
There is a video online of someone ( Dan ) who went through a complete breakdown if your want to see all the bits...
ghostwriter66
"Here - Hold my Beer"
So about 87% life remaining which is outstanding at this price ... who knows .. with a few more cycles and pushing the voltage to max/min you could probably get them to over 90% ...
I want to see if we got some wack numbers from those with active BMS installed. All my BYD's came with no balancing board. Was balance added to control packs as aged? I would not think we would see a mix of A / P in the same installed system.
In this sense I am talking about Passive being just watching the cells vs Active that does do balancing on the cells but with external power.
It would seem the tech direct guys see no problem setting these packs upright. I wouldn't. I like the little value add these guys do to get the max return and also usability out of the used packs.
Last edited:
I agree
I agree
Similar threads
