Recent content by paddy72


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    TP4056 current overhead?

    Input voltage of 5.8 V is too high and the current of 5.26 A for 3 of the TP4056 in parallel is much too high without any cooling. I guess they wouldn't last long this way... You should definetly drop input voltage to 5V max., better less (4.5... 4.8V is best imho)
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    Looking For As from 9Ah- 26Ah (12Volts) Second Life Lithium Ion Batteries

    It has a reason why the overland lines always run on HV ;) On the other hand when the PV is rather small (low wattage) and the light conditions are dim i get better results with panels in parallel than in series (not 100% sure why). Probably you need a minimum current for any device to run and...
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    PV wiring when in shade

    O.k. - understood the problem. 'terraced houses' would be called 'Reihenhäuser' in Germany ;-) Yes, if it looks like this the problem is clear - i think i wouldn't mention it either :cool: In Germany they start to enforce laws for new houses they must have a PV-panel roof of a certain wattage...
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    PV wiring when in shade

    If it's a legal grey area i would make sure the PV is accepted before i would invest or even install the panels ;) If PV is allowed i would ask if it wouldn't be an option to optimize the law for PV usage if its only the chimney. What does 'terrace row' mean? Is it a flat building with flat roof...
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    PV wiring when in shade

    Just for curiosity: what local law prohibits to remove a chimney that isn't used any more? Is this a special style old house that needs to be conservated as is for historic reasons or is it just because other houses in the street have the same kind of chimney? Don't energy saving and environment...
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    Looking For As from 9Ah- 26Ah (12Volts) Second Life Lithium Ion Batteries

    Are you talking of lead-acid batteries or Li-ion? There are also different Li-ion chemistries like NMC, LCoO or LFP and others. Also your specs are rather small, even 26 Ah with 12V only means 300 Wh - which is less than most ebike accus :unsure:
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    Acceptable price for Automotive cells

    A 6 kWh pack for 350 eur sounds supprisingly cheap. For a tesla modul (3) with 5,35 kWh you normally pay around 1000 eur. How does he know it has 2 bad cells? And is it really new or used - i would be suspicous i guess...
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    newbie - need help with Segway 73.6V 5600 mah battery

    It could be a bad BMS 7 BMS error or cell problem (low capacity, self-discharge, e.g.) If the cells packs a individually fully charged and the Segway does still not work, the BMS has probably recognized a problem saved as an error parameter in a Microcontroller and so refuses to work. If the...
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    TP4056 current overhead?

    I use TP4056 for at least 2,5 or 3 years to charge my 18650 cells - for each cell one TP4056 - 4 or more in parallel on the same voltage source. I used them with the original resistor that limitates the charge current (its little less than 1 Amp with 5 V input). Yes, the IC can get quite hot...
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    What spot welder are people using these days?

    If you're really into DIY here is a spot welder build from an old welding transformer with a new secondary winding in 120mm2 copper (4 wires in parallel, 4 turns): DIY spotwelder with timer control (german) I added an electronic timer to select the weld time in ms (from ca. 25 ms to ca. 500 ms)...
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    Nickel Iron batteries

    Nickel iron (edison) batteries are probably one of the most durable and stable batteries available but they also have downsides compared with Li-ion: Capacity per volume/weight is low (ca. 20 Wh/kg) - which is 1/10 or less of Li-ion, voltage is lower (1.3V/cell), price is high. The Pro's are...
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    Fast Charging - 500a @ 400v = 200kw - WOW

    Yes, the power is impressive but high power input and output means additional measures to cool down the battery (which decreases the overall efficiency of the system) and additional wear down of the battery. The most efficient and most healthy way for the cells would be slow charging (and...
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    Cause of heater-effect at around 4.0V and high self discharge at full voltage (4.2 ... 4.0V)

    Interesting theory and i have thought of something similar. The building and growth of dendrites is quite mystical to me (and probably to scientists as well), and the circumstances that enables the building and grwoth of them. Any 'force' during charging (and discharging?) maybe such a condition...
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    Cause of heater-effect at around 4.0V and high self discharge at full voltage (4.2 ... 4.0V)

    Yes, this can happen a few times. With some luck you will reach the 4.2V at the end (often needs some attempts), but some cells will never reach that voltage unless you really push it hard with a charging voltage of 4.3... 4.5 V. This can get dangerous and when the cells really heat up stop the...
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    Cause of heater-effect at around 4.0V and high self discharge at full voltage (4.2 ... 4.0V)

    Try to charge them in steps and stop charging when they get hot! Let them cool down and charge again or charge them very slowly (50...100mA rate). If they overcome the 4.0V level they should accept more charge without getting too hot. Be aware its always dangerous to charge heaters and keep an...
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