Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
This is really bad practice. It will result in the unbalancing of the charge across the battery string; though at 5ma vs 6.7A it may not be much of an issue in this case.why not tap it off the first battery in the bank grab 12 volts there (i am assuming it is 12 volts in series of about 50 other batteries...
kchriste said:This is really bad practice. It will result in the unbalancing of the charge across the battery string; though at 5ma vs 6.7A it may not be much of an issue in this case.
The OP really needs to tell us what the source of the 600V is before we can give valid advice. If it comes from a switching regulator, you could add a coil to the transformer to tap at a lower voltage, etc.
ezpcb said:No DC-DC chips accept 600v input. Maybe you can design a DC-DC circuit with high voltage MOSFET. But I prefer the resistor solution, after all the output is only 5ma.
Mike
ezpcb said:I haven't read your answer at all. I was answer the first post.I'm not interested in your idea and won't read it.
Ahem.... All 12v lead acid batteries are actually 6 2V cells in series. This is what an equalization charge cycle is for.Besides they should not be charged in series that would be more prone to failure each battery should be charged individually.
Maybe YOU should read my posts more carefully:So in short I think your comment is hog wash considering things like self discharge rates, losses in connections, and system will never call 100% of the battery capacity (otherwise going to be replacing alot lead acid cells) I think it can stand to lose 0.08 percent on one cell to acheive the goal !
Besides, the OP never mentioned batteries in this thread anyways. I stand by my original post; tapping a battery string is bad practice. Think about this scenario: what happens if the bottom battery in the string goes open or is disconnected? Voila, -588 volts where there was once 12V!!!!It will result in the unbalancing of the charge across the battery string; though at 5ma vs 6.7A it may not be much of an issue in this case.
What I meant was that ALL 12V lead acid batteries are made up of six 2Volt cells. Hence the cells are in series and are charged/dsicharged in series. Whether you have two 6V batteries in series or just one 12V battery, it is still six 2Volt cells in series!besides if ya read back. I stated the 12volt cells should be charged individually and not in a series setup.
It will if the current drawn off the tap point is large enough. It will result in the bottom battery being under charged and the remaining being over charged; resulting in excessive gassing of the top batteries in the string and sulfating of the bottom one.It will result in the unbalancing of the charge across the battery string;
Sorry I just dont agree with this statement