Bart
New member
- Joined
- Jun 30, 2020
- Messages
- 20
I have not posted in three months been working and getting everything ready for this battery build also working on my RV's interior and as you all no it takes up to three months to get parts from China. "BMS only cost me $55 each when I order them directly from Daly's site on Ali-Express.
I just finished the first of three battery I'm building, the actual cost of this battery is $382.00. A total of around 2600wh each "see the picture of the capacity test below" This will be running my electrical needs in my RV renovations. The 18650 batteries are from battery hookup averaging 2850mAh each, "LG Pegatron Modem Packs LGABB41865" in a 38p 7s configuration, BMS from Daly, "7s Bms 29.4v Lithium Battery Bms Charging Voltage 29.4v 100A with fan" the wire comes from Windy Nation, 125amp DC breaker and volt meter came from AliExpress, I 3-D printed a few of the parts, the rest of the parts come from Amazon.
Each of the seven cells in the battery are connected with fused nickel strip from battery hookup and have two 10 gauge wire from Windy Nation on the positive and negative sides and are joined at the top of the battery with an 8 gauge pure copper lug also from Windy Nation. Also added a separate connector for balancing, this way I am able to parallel balance the cells when needed.
Each of the batteries are connected in series and I have six gauge wire running to the breaker and the terminals. I also bought some chair rubber stoppers from Menards to cover all the terminals they work perfect.
I just ordered another 120 modem packs from battery hookup so I will be able to build one more battery and as soon as more of these modem packs come available I will build the third battery I have already purchased all of the supplies needed for the rest of the battery build, I'm just wanting to use the exact same cells in each battery for this project. As I'm still about three months away from finishing RV renovation no rush.
Finally when I did my capacity test I charge the battery to 29v and discharge to 21v with a total of 2637.11Wh sorry about the rest of the data on the screen when I was pulling it up to take a picture I hit the clear button and it zeroed out the Ah and it took 24 hours to do the test and I didn't want to do it again, I believe it was around 103Ah at the time which would make the nominal voltage of the battery around 25.6v.
The battery has a maximum voltage 29.4v and a maximum discharge voltage of 19.25v but I plan to only charge the battery to 29v and discharge the battery to 21v.
P.S. Just a side note these battery modem packs from battery hookup are great it ended up costing $.75 per cell "cells never cycled" and the specs on the battery state they're only 2600 mAh but I average 2900 to 2800 on every single cell. But I'm finding I have to check the site every day as these modem packs sell out within minutes of being posted I missed the last two postings as they sold out that quick and I was able to get 120 this time so hopefully they will have more come available soon.
I just finished the first of three battery I'm building, the actual cost of this battery is $382.00. A total of around 2600wh each "see the picture of the capacity test below" This will be running my electrical needs in my RV renovations. The 18650 batteries are from battery hookup averaging 2850mAh each, "LG Pegatron Modem Packs LGABB41865" in a 38p 7s configuration, BMS from Daly, "7s Bms 29.4v Lithium Battery Bms Charging Voltage 29.4v 100A with fan" the wire comes from Windy Nation, 125amp DC breaker and volt meter came from AliExpress, I 3-D printed a few of the parts, the rest of the parts come from Amazon.
Each of the seven cells in the battery are connected with fused nickel strip from battery hookup and have two 10 gauge wire from Windy Nation on the positive and negative sides and are joined at the top of the battery with an 8 gauge pure copper lug also from Windy Nation. Also added a separate connector for balancing, this way I am able to parallel balance the cells when needed.
Each of the batteries are connected in series and I have six gauge wire running to the breaker and the terminals. I also bought some chair rubber stoppers from Menards to cover all the terminals they work perfect.
I just ordered another 120 modem packs from battery hookup so I will be able to build one more battery and as soon as more of these modem packs come available I will build the third battery I have already purchased all of the supplies needed for the rest of the battery build, I'm just wanting to use the exact same cells in each battery for this project. As I'm still about three months away from finishing RV renovation no rush.
Finally when I did my capacity test I charge the battery to 29v and discharge to 21v with a total of 2637.11Wh sorry about the rest of the data on the screen when I was pulling it up to take a picture I hit the clear button and it zeroed out the Ah and it took 24 hours to do the test and I didn't want to do it again, I believe it was around 103Ah at the time which would make the nominal voltage of the battery around 25.6v.
The battery has a maximum voltage 29.4v and a maximum discharge voltage of 19.25v but I plan to only charge the battery to 29v and discharge the battery to 21v.
P.S. Just a side note these battery modem packs from battery hookup are great it ended up costing $.75 per cell "cells never cycled" and the specs on the battery state they're only 2600 mAh but I average 2900 to 2800 on every single cell. But I'm finding I have to check the site every day as these modem packs sell out within minutes of being posted I missed the last two postings as they sold out that quick and I was able to get 120 this time so hopefully they will have more come available soon.
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