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StirCrazy

Kamloops, BC, Canada

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Joined: 07/16/2003

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Posted: 12/02/22 06:28am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

I bought cells from Liitokala. If spending money today I would go with Docan.

BTW there are no 310/320 cells. Some may test above spec but they are about 304/306 if listed by an honest seller.

https://www.docanpower.com/index.php?route=product/category&path=60_154

Probably need to order direct from CN if shipping to CA. If you will be down in Texas they can be picked up in person if preordered.


ya I know there actualy 304, they typicaly test out between 314 and 320 so a lot of sellers are selling them as 304, 310, or 320 all the same battery though. there are a lot of lead acid battery sellers that do the same. price acording to actual capacity


2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

StirCrazy

Kamloops, BC, Canada

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Joined: 07/16/2003

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Posted: 12/02/22 06:30am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

otrfun wrote:

The 230ah and 280ah EVE cells sold at 18650batterystore.com (located in Atlanta GA and ship worldwide) would be my hands-down, first choice in terms of price, cell quality, and excellent after the sale support. Check-out the two threaded hole terminals on these cells. Larger contact area and much better mechanical support vs. the typical one-hole terminals used on the vast majority of cells.
+1 to seek out these factory terminals with two points of attachment.


ya I was looking at these, a lot of companys are going to lazer welded studs on top now, but this is a whole new game ')

S Davis

Western WA

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Posted: 12/02/22 10:31am Link  |  Quote  |  Print  |  Notify Moderator

I purchased 28 EVE cells from Docan Power in two purchases. The cells are excellent, but they are the LF280N which is the previous model. There have been reports of bloated cells and slightly low capacity with the newer LF280K.

StirCrazy

Kamloops, BC, Canada

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Posted: 12/03/22 06:10pm Link  |  Quote  |  Print  |  Notify Moderator

S Davis wrote:

I purchased 28 EVE cells from Docan Power in two purchases. The cells are excellent, but they are the LF280N which is the previous model. There have been reports of bloated cells and slightly low capacity with the newer LF280K.


I was looking at there site, they don't have the fancy lazer duel bolt conectors but they do have the 304AH which will match my current battery.

which company has been shipping new 280K's that are bloated and don't pull capacity, I have head nothing but good about them , but they were all new cells.

otrfun

On The Road

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Posted: 12/05/22 08:26am Link  |  Quote  |  Print  |  Notify Moderator

The larger 280-310ah cells are by far the most popular. We're partial to the smaller 200/230ah cells because 4 of these cells, a 200a BMS, heating pads, thermostat, active balancer, etc. will all fit inside a plastic Group 24 battery box. Having a portable (40 lb.), standalone 200/230ah battery that can support max c-rates (charge & discharge) down to 0f, is a big plus for us. Two of these will fit inside our truck camper's existing battery compartment (sized for 2 Group 27 batteries) with only some small modifications to the ends of the battery boxes.

StirCrazy

Kamloops, BC, Canada

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Joined: 07/16/2003

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Posted: 12/05/22 07:34pm Link  |  Quote  |  Print  |  Notify Moderator

otrfun wrote:

The larger 280-310ah cells are by far the most popular. We're partial to the smaller 200/230ah cells because 4 of these cells, a 200a BMS, heating pads, thermostat, active balancer, etc. will all fit inside a plastic Group 24 battery box. Having a portable (40 lb.), standalone 200/230ah battery that can support max c-rates (charge & discharge) down to 0f, is a big plus for us. Two of these will fit inside our truck camper's existing battery compartment (sized for 2 Group 27 batteries) with only some small modifications to the ends of the battery boxes.


I can get that, my issue is I have a old camper (1991) that only has one compartment for a single battery, but that holds my leveling blocks and water hose just perfectly haha. I have a useless space by the furnace and fridge that will just fit (width and hight) a single battery made from the larger size cells. with the battery installed there is still room to put an inverter in front of it if I decide and this space is about 1 foot from my power center so all the wiring will be short.

StirCrazy

Kamloops, BC, Canada

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Posted: 12/05/22 07:40pm Link  |  Quote  |  Print  |  Notify Moderator

so this turned out to be a blessing in the end, I found another place to order from that yes will be double the price but still comparable to two high quality 6V deep cycles, maybe even a little cheeper. the other ones I figured I would recive B grade cells which would probably be perfectly fine for what I need in the camper, so considering the new ones are A grade direct from eve thats reasonable for a price.

I am going to down size to 280AH cells and get the new K ones from eve. this version has a working temp range of -30C to +60C so even PT would be able to use these ones aside from a week or two a year [emoticon]

otrfun

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Posted: 12/06/22 10:18am Link  |  Quote  |  Print  |  Notify Moderator

StirCrazy wrote:

otrfun wrote:

The larger 280-310ah cells are by far the most popular. We're partial to the smaller 200/230ah cells because 4 of these cells, a 200a BMS, heating pads, thermostat, active balancer, etc. will all fit inside a plastic Group 24 battery box. Having a portable (40 lb.), standalone 200/230ah battery that can support max c-rates (charge & discharge) down to 0f, is a big plus for us. Two of these will fit inside our truck camper's existing battery compartment (sized for 2 Group 27 batteries) with only some small modifications to the ends of the battery boxes.
I can get that, my issue is I have a old camper (1991) that only has one compartment for a single battery, but that holds my leveling blocks and water hose just perfectly haha. I have a useless space by the furnace and fridge that will just fit (width and hight) a single battery made from the larger size cells. with the battery installed there is still room to put an inverter in front of it if I decide and this space is about 1 foot from my power center so all the wiring will be short.
Ref using the battery compartment for storage, yup, old habits die hard--lol!

You're fortunate to have the option to locate everything in the same general area. Reduces cable losses and makes installation and maintenance easier.

Our TC would have required extensive modifications to do the same. We elected instead to locate everything (lifepo4, inverter, dc2dc, etc.) throughout our TC and use 4/0 and 2/0 cable to keep losses to a minimum. Completed everything about 18 mo. ago. Everything's been working flawlessly. That 200ah lifepo4 is a powerhouse. Use it to power the microwave and a/c all the time.

StirCrazy

Kamloops, BC, Canada

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Joined: 07/16/2003

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Posted: 12/07/22 08:05am Link  |  Quote  |  Print  |  Notify Moderator

otrfun wrote:

StirCrazy wrote:

otrfun wrote:

The larger 280-310ah cells are by far the most popular. We're partial to the smaller 200/230ah cells because 4 of these cells, a 200a BMS, heating pads, thermostat, active balancer, etc. will all fit inside a plastic Group 24 battery box. Having a portable (40 lb.), standalone 200/230ah battery that can support max c-rates (charge & discharge) down to 0f, is a big plus for us. Two of these will fit inside our truck camper's existing battery compartment (sized for 2 Group 27 batteries) with only some small modifications to the ends of the battery boxes.
I can get that, my issue is I have a old camper (1991) that only has one compartment for a single battery, but that holds my leveling blocks and water hose just perfectly haha. I have a useless space by the furnace and fridge that will just fit (width and hight) a single battery made from the larger size cells. with the battery installed there is still room to put an inverter in front of it if I decide and this space is about 1 foot from my power center so all the wiring will be short.
Ref using the battery compartment for storage, yup, old habits die hard--lol!

You're fortunate to have the option to locate everything in the same general area. Reduces cable losses and makes installation and maintenance easier.

Our TC would have required extensive modifications to do the same. We elected instead to locate everything (lifepo4, inverter, dc2dc, etc.) throughout our TC and use 4/0 and 2/0 cable to keep losses to a minimum. Completed everything about 18 mo. ago. Everything's been working flawlessly. That 200ah lifepo4 is a powerhouse. Use it to power the microwave and a/c all the time.


ya, well I kinda took away the real storage to get the two 6V GC batteries in there so I had a little tiny storage where the old battery was, so I think of it as gaining my storage back haha

which active balancer did you go with, did your BMS not have active balancing?

Steve

otrfun

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Posted: 12/07/22 01:01pm Link  |  Quote  |  Print  |  Notify Moderator

StirCrazy wrote:

. . . which active balancer did you go with, did your BMS not have active balancing?

Steve
Our JBD 200a BMS has a passive balancer. Most of the popular DIY-type BMS's (like JBD and Daly), along with most budget lifepo4 batteries sold on Amazon use passive balancers. Unfortunately, they're inefficient ("burn" vs. move current), slow (50-150ma) and sometimes only work when there's charge current present. It can take days to resolve significant imbalances.

We purchased a 4S Heltec active balancer and only switch it on to resolve larger imbalances. Specs say it can move up to 5a (5000ma). We've seen it resolve a 200-250mv delta down to 5mv within an hour or two. Pretty quick. The only time we find the need to switch on the Heltec is after we've done repeated, high c discharges from 100% to 10%. We may do these deep discharges a couple times a day during the summer when we run the a/c during breaks on the road (use a dc2dc to charge). With this kind of abuse, the cells tend to drift a bit. We charge the cells to near 100%, then turn on the Heltec. Everything resolves to <5mv in <30 min. (it more or less accomplishes a top-balance).

* This post was edited 12/07/22 02:13pm by otrfun *

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