https://batteryhookup.com/products/n...-2900mah-cells
One note these battery packs are below 10 volts and the BMS protection board has locked them off from having any voltage on the BMS output wires I have tested three of them so far and voltage is around 8 volts it not an issue because it testing about 9.2 amp hours
The price of this offer has gone up sense I bought these two boxes
I bought two boxes of these batteries but there is a catch to the these battery packs
The BMS protection board does work but it has the limitations that are given below
One is that the BMS protection board limits the current to about 1.5 amp so my battery testing machine can not charge this battery pack ( because it tripping the BMS protection board ) unless I do the modification that I was talking about earlier in another post about the mosfet failure that I had trying to charge batteries with BMS protection boards ( I will not be able to test these battery packs before I put them in service )
But I have to go one step further not only do I have to control the incoming voltage but I also have to control the incoming current as well which now I will have to make a modification to the mosfet board and do away with the buck converter completely ( and use one that I can control both voltage and current on the same board ) because it is set up for the maximum of 5 amps no matter what the voltage is
( one note the data sheet for this buck converter does not show this configuration that was used on this battery testing machine )
The second issue is the connector on the battery pack I do not access to the type of connector that is being used for the battery pack but it is not hard to remove the connector and just use two wires for the BMS connections ( one note use plastic tool to open the enclosure because the batteries are very close to the enclosure walls and this is the reason for using plastic chisel to open up the enclosure )
The hole reason for this project is so that I can make a solar powered LED light fixture for my shed and convert a magnifying glass LED fixture to solar power
I also bought a very good solar panel from Battery Hookup as well it is a 18 volt 3 amp solar panel for around $50.00
My son bought a solar / outlet / vehicle / battery pack power generator and I used to charge this device with the solar panel and was impressed with how fast it was charging this device
The solar battery pack generator came with a 30% charge out of the box from 12 noon until 5 pm it went around 60% then the next day I started at 10 am to 5:30 pm and now it at around 86% and when I put it out there today it should finish charging it
In normal use conditions you would not depleted the battery pack that low so it would not take this long to charge the battery pack
If you have a power outage from a storm you would be charging it up every day while the sun is out
If I were setting this up I would first of all use more than one solar panel but the limitations on this solar panel charging is limited about 8 amps so I would be limited to two panels to not go over the limitation
Which I do have two solar panels from battery Hookup but do not have the “Y” connectors to be able connect two panels together in parallel for faster charging
One note these battery packs are below 10 volts and the BMS protection board has locked them off from having any voltage on the BMS output wires I have tested three of them so far and voltage is around 8 volts it not an issue because it testing about 9.2 amp hours
The price of this offer has gone up sense I bought these two boxes
I bought two boxes of these batteries but there is a catch to the these battery packs
The BMS protection board does work but it has the limitations that are given below
One is that the BMS protection board limits the current to about 1.5 amp so my battery testing machine can not charge this battery pack ( because it tripping the BMS protection board ) unless I do the modification that I was talking about earlier in another post about the mosfet failure that I had trying to charge batteries with BMS protection boards ( I will not be able to test these battery packs before I put them in service )
But I have to go one step further not only do I have to control the incoming voltage but I also have to control the incoming current as well which now I will have to make a modification to the mosfet board and do away with the buck converter completely ( and use one that I can control both voltage and current on the same board ) because it is set up for the maximum of 5 amps no matter what the voltage is
( one note the data sheet for this buck converter does not show this configuration that was used on this battery testing machine )
The second issue is the connector on the battery pack I do not access to the type of connector that is being used for the battery pack but it is not hard to remove the connector and just use two wires for the BMS connections ( one note use plastic tool to open the enclosure because the batteries are very close to the enclosure walls and this is the reason for using plastic chisel to open up the enclosure )
The hole reason for this project is so that I can make a solar powered LED light fixture for my shed and convert a magnifying glass LED fixture to solar power
I also bought a very good solar panel from Battery Hookup as well it is a 18 volt 3 amp solar panel for around $50.00
My son bought a solar / outlet / vehicle / battery pack power generator and I used to charge this device with the solar panel and was impressed with how fast it was charging this device
The solar battery pack generator came with a 30% charge out of the box from 12 noon until 5 pm it went around 60% then the next day I started at 10 am to 5:30 pm and now it at around 86% and when I put it out there today it should finish charging it
In normal use conditions you would not depleted the battery pack that low so it would not take this long to charge the battery pack
If you have a power outage from a storm you would be charging it up every day while the sun is out
If I were setting this up I would first of all use more than one solar panel but the limitations on this solar panel charging is limited about 8 amps so I would be limited to two panels to not go over the limitation
Which I do have two solar panels from battery Hookup but do not have the “Y” connectors to be able connect two panels together in parallel for faster charging
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