Need new batteries. Any advice?
New here, howdy ya'll.. got a new to me travel trailer, 26ft, and am need of new batteries. there are 2 in the front, looked to be wired together. It currently has 2 old interstate deep cycle batt...
Forum Discussion
Gdetrailer wrote:
Steve,
Now, with Lithium batteries the BMS allows only 80% of the capacity to be used, internally the batteries are capable of another 20%.. The BMS limits your use.
Lithium battery manufacturers typically rate their batteries with 3,000 or more charge/discharge cycles.. I am here to say, that is not 100% true in all cases and those are "pie in the sky" overly optimisti
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the res of your post was a bunch of fear mongering that has nothing to do with this chemistry so I won't make any further coment on it. this part is two but I have to corect this. a BMS will not limit you to 80, or 90 or 60% unless you set it that way. most give you the full capacity of the battery a couple companies we suspect have added extra battery capacity and limited it to 100 AH but nothing has been proven on that front. every battery rip down I have seen on a 100 amp battery has had 100 to 105Ah depening on the batteries. just like when a lead asid battery is made for the same 100AH battery some will test out at 80 some will test out at 110 and are sold as different series.
as for the cycles there is a actual cycle test and its not pi in the sky they repeatadly charge and discharge at 1C from 100 to 0 to 100%.
so one hour to discharge 1 hour to charge and they see how many times they can do it. when they slap the life on it it is a calculated average of so may trials. any time they come up with a new design or capacity they have to redo the trials and then they also have random sample tirals after every so long on established runs. is there going to be the odd one that slips through the cracks, probably would be more if they were manufactured in the US as no one would be watching them as hard.
