Timeline for How to extract electricity from a permanent magnet generator (PMG) to charge a 48V battery bank?
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
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| Jul 19, 2022 at 15:27 | review | Close votes | |||
| Aug 3, 2022 at 3:05 | |||||
| Jul 19, 2022 at 15:07 | comment | added | Kuba hasn't forgotten Monica | I’m voting to close this question because it suggests benefits of a kludge that has no benefits whatsoever, and reeks of free energy nonsense. Even discussing this is a waste of time. The "answer" is: don't. | |
| Jul 19, 2022 at 15:06 | comment | added | Kuba hasn't forgotten Monica | Why the motor? You already have a DC power source. Use an inverter to convert from whatever DC comes in to 48V. It will be more efficient than going through a motor and a generator. Period. Also, the voltage on the generator doesn't matter much. High voltage doesn't imply lots of power. You have to measure power using a load and a power meter not using a voltmeter. The voltmeter results are irrelevant. | |
| Jul 19, 2022 at 13:42 | history | migrated | from diy.stackexchange.com (revisions) | ||
| Jul 19, 2022 at 1:51 | comment | added | Paul Evans | @Triplefault Thank you, this is some helpful information. I was thinking along the lines of solar chargers because the PMG seems to me that it acts a little like a solar panel... the energy it produces is variable depending on the speed and load. I was thinking solar panels are a little like that with weather and temperature changes. I don't know how to do that test honestly but it sounds like a logical next step. I'll pursue it - thank you! | |
| Jul 19, 2022 at 1:47 | comment | added | Paul Evans | @GeorgeAnderson Sorry about that. PMG - Permanent Magnet Generator. MPPT - Maximum Power Point Tracking. You're right, it might be a better question for electrical engineering, although I am way out of my depth over there! Happy to have my question moved, should someone want to do it. | |
| Jul 19, 2022 at 1:44 | comment | added | Paul Evans | @manassehkatz-Moving2Codidact Utility/City power. | |
| Jul 19, 2022 at 1:13 | answer | added | Ecnerwal | timeline score: 2 | |
| Jul 19, 2022 at 0:56 | comment | added | Ecnerwal | If you want to waste less power, remove the motor (inherent mechanical and electrical losses) and generator (inherent mechanical and electrical losses) and just use a 48V charger designed to operate from whatever voltage you have to drive the DC motor (a "boost" charger if that's presumably low voltage, though you make it a mystery.) Then you only have the inherent losses in the boost charger magnetics. | |
| Jul 18, 2022 at 23:36 | comment | added | Triplefault | I think an MPPT won't be the right choice, as it is designed to control drawn current until the solar panel's power 'knee' is found, then wiggle around over time to track the 'knee'. Your PMG will have some kind of input-HP-vs-output-Watts characteristic, but it probably won't be a 'knee'-like curve that wants tracking. Have you tried a basic resistive load to see what volts vs amps you can get, and how much engine power it takes to turn the PMG under that load? | |
| Jul 18, 2022 at 23:21 | comment | added | George Anderson | You are using too many acronyms, please revise your question to define what PMG and MPPT mean. This might be a better question for electrical engineering and should probably be migrated. oops saw in your title what PMG means, my bad! Still I think your question should be migrated. | |
| Jul 18, 2022 at 23:19 | comment | added | manassehkatz-Moving 2 Codidact | What is powering the "small DC motor" at the beginning of the chain? | |
| Jul 18, 2022 at 23:14 | history | asked | Paul Evans | CC BY-SA 4.0 |