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| USB-C charging law in the EU. |
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| tooki:
It’d certainly be trivial for the manufacturers to make an AC-powered dummy battery, akin to what’s common in cameras. |
| wraper:
--- Quote from: tooki on November 15, 2023, 08:42:08 am ---It’d certainly be trivial for the manufacturers to make an AC-powered dummy battery, akin to what’s common in cameras. --- End quote --- That PSU most likely will be more expensive than AC powered tool, and likely oversized quite a bit to have enough power. I doubt you want something like 0.5-1.5kW PSU attached to the tool. Somewhat reasonable only for low power tools. |
| Siwastaja:
Yes, the problem with extra low voltage stuff is that power tools require high peak currents so power supplies need to be overdimensioned for the maximum monentary current. Power supply capacitors can supply peaks only for milliseconds, while li-ion batteries can easily supply 20-30A peak currents for seconds or even minutes. This makes corded/battery hybrid solutions infeasible, they would be even more expensive and generate even more e-waste. With corded stuff that operates directly at mains voltage, this problem does not exist. Sure, it might take 2kW peak and 500W average to achieve the same you get from a battery with 500W peak and 50W average, but it's insignificant in energy bill if you use it for a few minutes a year. Material and manufacturing cost dominates, and it's the smallest with a small crappy mains universal brushed motor directly switched through simple power switch to a cord, barely dimensioned to handle the current without melting. Manufacturers are good at cost minimization of this kind of stuff. The cost of a corded power tool for $20 and similar battery version for $40 reflects this difference. |
| tom66:
--- Quote from: wraper on November 15, 2023, 09:04:41 am --- --- Quote from: tooki on November 15, 2023, 08:42:08 am ---It’d certainly be trivial for the manufacturers to make an AC-powered dummy battery, akin to what’s common in cameras. --- End quote --- That PSU most likely will be more expensive than AC powered tool, and likely oversized quite a bit to have enough power. I doubt you want something like 0.5-1.5kW PSU attached to the tool. Somewhat reasonable only for low power tools. --- End quote --- You almost want a small 'buffer' battery that can handle the peak load and a charger that can top it up at, say, 200W. But I suspect that such a pack would still be quite heavy and probably need air cooling (if only for the battery cells) which creates lots of headaches in a high dust environment. Just get the 4-5Ah equivalent pack if you need a long endurance, or use a wired tool for those odd jobs. Trying to get one tool to do both is unlikely to work out that well. |
| wraper:
--- Quote from: Siwastaja on November 15, 2023, 09:25:01 am ---Sure, it might take 2kW peak and 500W average to achieve the same you get from a battery with 500W peak and 50W average, but it's insignificant in energy bill if you use it for a few minutes a year. --- End quote --- Many if not most battery powered tools still use brushed motors. And they are not that much worse than BLDC variants of the same tool. Saying that if powered from AC, the same tool suddenly becomes 4-10x less efficient is nonsensical. |
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