6yolithium
New Member
Hi all, new to the forum. We've been off grid for 20 years.
I built a 432ah 24v lifepo4 battery bank 6 years ago. I want to split that into two 12v to use elsewhere, and have
purchased 8 EVE280k grade A from 18650 and had planned on a 2p8s 560amp 24v battery.
However, reading here has brought up questions. Some here say 2 batteries in parallel is better than one larger and I can see where it would be nice to be able to take one out if work was needed on it and still have power, but the whole point to me of lithium is to NOT need to "work on it".
The second thing I read is that 2p8s needs a 16 connection bms, and I had almost ordered an 8s, since I assumed the paralleled cells only needed one connection? So I was wrong there? Good thing I did a search on here!
One reason I wanted the 2p8s was to have both + and - at one end. Our current battery is in a large cooler in an unheated power shed, the cooler has a false bottom with a ceramic terrarium heater (18 watts? I think) hooked up to an automatic temperature sensor. Plus I have a wireless thermometer so I can keep an eye on the temps from the house. So the batteries stay comfy even in - temps.
The connections to the inverter from battery are at one end and the +and- are the same length.
I wanted to do the same layout with the new batteries.
So, number one: I guess I need a 16 connection bms? Or buy 2 bms if i parallel two 8s batts?
Is there a definite reason two 8s batteries run in parallel is better than one battery 2p8s, other than having power "if needed" ?
Which is really better for the longest life of the cells?? That's what is most important.
Thanks!
I built a 432ah 24v lifepo4 battery bank 6 years ago. I want to split that into two 12v to use elsewhere, and have
purchased 8 EVE280k grade A from 18650 and had planned on a 2p8s 560amp 24v battery.
However, reading here has brought up questions. Some here say 2 batteries in parallel is better than one larger and I can see where it would be nice to be able to take one out if work was needed on it and still have power, but the whole point to me of lithium is to NOT need to "work on it".
The second thing I read is that 2p8s needs a 16 connection bms, and I had almost ordered an 8s, since I assumed the paralleled cells only needed one connection? So I was wrong there? Good thing I did a search on here!
One reason I wanted the 2p8s was to have both + and - at one end. Our current battery is in a large cooler in an unheated power shed, the cooler has a false bottom with a ceramic terrarium heater (18 watts? I think) hooked up to an automatic temperature sensor. Plus I have a wireless thermometer so I can keep an eye on the temps from the house. So the batteries stay comfy even in - temps.
The connections to the inverter from battery are at one end and the +and- are the same length.
I wanted to do the same layout with the new batteries.
So, number one: I guess I need a 16 connection bms? Or buy 2 bms if i parallel two 8s batts?
Is there a definite reason two 8s batteries run in parallel is better than one battery 2p8s, other than having power "if needed" ?
Which is really better for the longest life of the cells?? That's what is most important.
Thanks!