diy solar

diy solar

Recent content by Turponieminen

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    Cylindrical cells 100AH

    Probably these are grade b cells. Most likely they are cells that manufacturer sells at discounted price to this Alibaba battery vendor because they have external damage. How ever It would mean they are new cells.
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    The secret to compression

    I am also thinking why cylindrical cells are not rated 6000+ cycles since they don't need compression?
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    The secret to compression

    Or use threaded rod and springs at the end. Much more cheap than some specialty foam.
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    The secret to compression

    I don't think foam keeps constant pressure. More likely it acts like a spring, gradually increasing pressure when it contracts.
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    The secret to compression

    Are we talking about pouch cells here
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    The secret to compression

    I don't think cells rupture, if they are assembled with hard surface against them or in between them. Many have done exactly that and i have never heard of an example of cells rupturing. Also cylindrical cells do not need compression due to their shape. They can not swell much and yet they won't...
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    The secret to compression

    Which test/data you are referring to? I have seen a datasheet that shows 2500 cycles uncompressed vs 3500 compressed. And even then, capacity curve showed faster degradation to over 1000 cycles with compression vs uncompressed.
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    Max charging and discharginf for my cells

    Yes, if you have beefy enough cables and busbars
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    Max charging and discharginf for my cells

    Charge 404 A, discharge 808 A
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    Lithium Battery Requirement for Mikrotek 2KW/36V Solar Inverter

    Yes, there is no confirmation can the batteries connected in series safely. Even the maximum Charge/discharge current would be 25A it is still just around 960w. That is too close to the maximum power output of two 440w panels. And less than half of what that AC inverter you are going to use can...
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    Lithium Battery Requirement for Mikrotek 2KW/36V Solar Inverter

    Hi. I did not see any specs for the batteries. Based on quick Google search batteries look like a cheap lead acid replacement, and datasheet of 100Ah and 120Ah versions are supporting only 10/25A of charging and discharging current. (80Ah version even less) I'm guessing that is maximum...
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    LiFePo4 Charge drop after charging

    Not necessarily, keep track of that cell during use. I would leave cells connected to parallel until final assembly
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    Does disconnecting Inverter under high load damage it?

    Ok. Thank you for this. Inverter does have a power switch and control port for remote panel. I think i will transfer my 12v timer/relay module to control inverter then. I only need to pull 12v from car battery instead of my Lifepo4 battery
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    Does disconnecting Inverter under high load damage it?

    Basically i have a setup where timer disconnects negative line (relay) between battery and inverter. Inverter is 2500w pure sine wave and load that gets disconnected is ~1200w. After relay disconnects there is a high pitched whine coming from the inverter. Does inverter or some components in it...
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    Normal swelling of aluminium cased cells?

    I am building a small 120Ah 12v battery, from those very common blue Chinese aluminium cased cells. ? During initial charging/top balancing to 3.65v I noticed cells swelling. They are 3-4mm thicker from middle compared from edge. iam guessing this is normal. I placed about 2 mm thick wooden...
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