Is this battery unusally big and heavy for 12v 200ah?
Dimension: | 525mm*271mm*232mm | Any dimension can be customized |
Weight: | 28KG |
Dimension: | 525mm*271mm*232mm | Any dimension can be customized |
Weight: | 28KG |
I don't even know the price. Do you?Why would you buy a battery with a questionable unknown BMS instead of putting one together yourself at a much better price etc?
Is this battery unusally big and heavy for 12v 200ah?
View attachment 5297
Dimension: 525mm*271mm*232mm Any dimension can be customized Weight: 28KG
To close this out... I top balanced the pack to 3.55 resting voltage on every cell, and was able to pull the full 300AH from this pack without going below the LVC. I am happy with this, and feel I got what I paid for so far. By the time I can comment on cell life, it will be irrelevant. Time to go boondocking!
Why would you buy a battery with a questionable unknown BMS instead of putting one together yourself at a much better price etc?
To close this out... I top balanced the pack to 3.55 resting voltage on every cell, and was able to pull the full 300AH from this pack without going below the LVC. I am happy with this, and feel I got what I paid for so far. By the time I can comment on cell life, it will be irrelevant. Time to go boondocking!
so once discharged, where they still balance and close to each other?
This is why I normally tell folks not to panic until they do a full discharge and recharge ... I am hoping that you have let the BLS folks know that everything is fine .. of course they are all on Chinese New Year break so they probably won't get your answer or texts until they get back ...
The weak cell was still the first to go below LVC, but the remaining cells were close enough. The pack delivers its rated capacity. If the weak cell was replaced with a cell more equal to the others, then I could probably milk a few more AH off the pack. In real life I plan to live in the 30 - 80 % SOC range in my RV so I'm not really bugged by this.
That is an RJ-Lithium pack. RJ appears to have a reasonable reputation and some folks here have been using them and are happy wit the products they have gotten from RJ. I personally have no experience with that company, just going by the feedback & what I've read over time.Is this battery unusally big and heavy for 12v 200ah?
View attachment 5297
Dimension: 525mm*271mm*232mm Any dimension can be customized Weight: 28KG
Could you please post some pictures of the cell voltages as they discharge, around 3.15V ... 3.00 V ... 2.75V?I top balanced the pack to 3.55 resting voltage on every cell, and was able to pull the full 300AH from this pack without going below the LVC.
Cheers for this timeline, I'm exactly a month behind you and also shipping to EU (UK) and although no tracking number I did see a [DE] note so guessed they would come via Germany to clear EU customs and for me not to get a billI received my order of 16pcs 150Ah cells from BLS yesterday. This was the timeline:
2019-11-29 Order placed
2019-12-02 UPS tracking number received
2020-01-08 Tracking number traceable in Germany
2020-01-13 First scan of the parcels
2020-01-15 Goods delivered in Sweden
I've not yet paid any additional fees, duties or taxes.
The packaging was very well done and arrived in perfect condition. The bus bars and fasteners included were of the same type as pictured by Xiryx above. The bus bars are made of two layers, each about 0.75 mm thick and 20 mm wide, for a total ~30mm2 section.
I'll try to take time this weekend to start doing capacity testing of each cell.
It will balance them, even a small voltage difference can be a larger SOC difference when LiFePO4 has such a flat curve in the middle of its range, how just the top and bottom where voltage/SOC change a lot. Cells are generally shipped/stored in this flat area of the graph ~40% charge, but when you charged and kept charging at the top for your balancing you did top-balance the cells.Paralleling cells without charging them is not going to do much for balancing. There is basically no voltage difference to drive any balancing current.
My tests are progressing. Logistically I can only do one cell a day, so results are going to take a while.
It will balance them, even a small voltage difference can be a larger SOC difference when LiFePO4 has such a flat curve in the middle of its range, how just the top and bottom where voltage/SOC change a lot. Cells are generally shipped/stored in this flat area of the graph ~40% charge, but when you charged and kept charging at the top for your balancing you did top-balance the cells.
the price move weekly up and down. i m guessing as they are in holiday currently up there and not working, they lifted the price but it will come down again in a couple weeks. it s been like this for the past few months with BLS.Bad news, BLS Aliexpress 150Ah cells have gone up in price,8PCS:US $851.40 ,16PCS:US $1,699.00,But BLS's own online store still maintains good discounts,I had to rethink my purchase plan.
BLS Aliexpress 8PCS:US $851.40
1064.06US $ 17% OFF|Grade A NEW 3.2V 120Ah Lifepo4 Battery 8PCS Rechargeable Lithium Iron Phosphate Solar 24V 176Ah Cells Not 150Ah 200Ah TAX FREE|Replacement Batteries| - AliExpress
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BLS Aliexpress 16PCS:US $1,699.00
1413.75US $ 13% OFF|Grade A 2021 New 16pcs 3.2v 120ah Lithium Iron Phosphate Cell Lifepo4 Battery Solar 24v 48v 176ah Not 150ah Eu Us Tax Free - Rechargeable Batteries - AliExpress
Smarter Shopping, Better Living! Aliexpress.comwww.aliexpress.com
BLS officiel 8PCS:US $799.40
8PCS 3.2V 150Ah Lithium Iron Phosphate Cell lifepo4 battery 24V150AH 12V300Ah
Model Number: lifepo4-150ahNominal Capacity: >150ahType: lifepo4Size: PrismaticVoltage: 3.2V 8Pcs 3.2V 150Ah Lifepo4 Battery Date of production: August 2019 Include Screw and BusBars 8pcs 3.2V150Ah Lithium iron phosphate cell Long Life Cycles 4000 Times For 12V 24V Solar Energy Storage Solar...blslifepo4battery.com
BLS officiel 16PCS:US $1,630.00
16PCS 3.2V 150Ah lifepo4 battery
Model Number: lifepo4-150ahNominal Capacity: >150ahType: lifepo4Size: PrismaticVoltage: 3.2V Include Screw and BusBars 8pcs Long Life Cycles 4000 Times For 12V 24V Solar Energy Storage Solar power system UPS supply Application: Engine starting battery, electric bicycle/motorcycle/scooter, golf...blslifepo4battery.com