Recent content by fungus

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    Large capacity cell charger

    Hi. Is there any recommendations on a modular scaleable Li ion cell charger? Like it can charge a lot of cells and ideally be able to add to the system to charge more cells? Or a li cell charger that can handle cells more than 10Ah? Ideally in the 100Ah range. Thank you.
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    Buck converter 12v to adjustable 3.6V to 4.2V? high current

    I had mentioned I couldn't find the link but the buck converter looked like the one in the picture. Buck is in the thread title. The target is less than $125 and becomes interesting. If in the $125 to 250 range is something still consider, but less desirable. It becomes economically feasible...
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    Buck converter 12v to adjustable 3.6V to 4.2V? high current

    Yes. I understand less voltage is more current. That is the law. I'm not avoiding it. It is within my specs. I'm using straight copper. Not tin or brass or nickel. The 3D orientation of the cells allows for shortest dual DC paths available and the busbars can handle the currents. I'm not...
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    Buck converter 12v to adjustable 3.6V to 4.2V? high current

    The BMS is only be needed in the charge cycle and cells being in parallel will efficiently self balance (unlike those older BMSs that has power loss). I want to get out of the business of having to search for efficient BMSs or knowing what technology the BMS has. My original plan was to use...
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    Buck converter 12v to adjustable 3.6V to 4.2V? high current

    Good point. If China says it is 40A, design it as a 20A. How many time I bought products from them and their specs were just overinflated. My original goal was if there was any buck converter available with higher current capacity available that might be a cost savings to me. The reason to not...
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    Buck converter 12v to adjustable 3.6V to 4.2V? high current

    Hi. I think I saw one of your videos. I thought I'd reduce the risk of fire and increase efficiency by parallelizing the cells. Less need to be critical on balancing by focusing on regulating the voltage during CCCV charge to never exceed the 4.2V. I am wary of Chinese electronics suck. But an...
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    Buck converter 12v to adjustable 3.6V to 4.2V? high current

    I'm looking at solid copper strips to cable, blades to bar. All the DC runs are designed to be real short, then I'm going to grid tied micro inverter at the battery packs to 240VAC for the long runs. There are no long runs using DC. Even between battery packs will be on AC.
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    Buck converter 12v to adjustable 3.6V to 4.2V? high current

    I did not know buck converters fail open. That good to know. Thank you whomever told me. That confirms using buck might be a good solution. It is just the first unit for prototyping, but later goal make 7 or 14 of these to fully power the house for 3 days. and of course, the fun project to make...
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    Buck converter 12v to adjustable 3.6V to 4.2V? high current

    Hello. I got about 1000 18650 cells to make one 3.6V/4.2V big cell. I want to fast charge them using either a 12V car battery or other multiple 12V power supplies (in the 300W+ range each). I found these noname Chinese made 40A buck converters CCCV around $13-$25 ea. That means I need ballpark...
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