If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
A complicated question about LiFePO4 batteries, - and switching.
On Tuesday, June 19, 2018 at 9:30:32 AM UTC-7, Andy Blackburn wrote:
John, Have you tried any of these? https://www.ebay.com/itm/15A-Solar-P...sAAOSw-0RbApaz They claim almost zero voltage drop compared to Schottkey diodes. Of course with the rapid voltage fallow of LiFePO4 batteries, it may only make a tiny difference in effective capacity. Andy Blackburn 9B On Tuesday, June 19, 2018 at 6:23:07 AM UTC-7, OHM Ω http://aviation.derosaweb.net wrote: - But I do have Schottkey diodes in each bus. Why, you might ask, do I have diodes if I have two separate electrical buses? Because I can bridge the two buses with another switch for that "just in case situation" (belts and braces engineering over design). I have never have to use this switch but then again you never know ... Thanks, John OHM Ω Being pedantic for a moment, the diode drop is proportional to the endurance reduction, and has little to do with the battery voltage characteristic. If you drop 0.7V on a 13V battery, you're going to be drawing 5% more power and have 5% less endurance. 0.3 across a Schottky is starting to look pretty small and across those virtual diodes not much at all. The explanation is that almost all modern electronics are using switching power supplies to produce the required amount of power at 5 or 3.3V. Less input voltage to the power supply just means it draws more current to get the same output. On that basis alone a 13.5V LFP will last 10% longer than a 12.5V SLA, at the same AH. If it weren't windy, I'd be flying instead of pedantic . |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
A Simple Question About LiFePO4 Batteries | [email protected] | Soaring | 49 | May 25th 18 04:27 PM |
LiFePO4 Batteries on sale. | [email protected] | Soaring | 20 | December 9th 15 05:34 PM |
K2 vs. StarkPower LiFePo4 batteries | Fox Two[_2_] | Soaring | 36 | April 16th 15 05:14 PM |
LiFePO4 Batteries | vontresc | Soaring | 56 | June 27th 14 07:25 PM |
LiFePO4 batteries | JS | Soaring | 26 | October 15th 12 02:51 PM |