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8 minutes ago, dochubert said:I jumped the gun! My apologies. Guess I'm just too used to disappointment. Expected it again.
Got my order in. Anxious to get them too.
Oh, don't know if it was just me, or something with the website, but when the order completed, the website went to never never land (blank screen) instead of saying Order Complete or returning to home page. Got confirming email so know it went through.
Thanks again and sorry for complaining.
I'm not too thrilled with SquareSpace...there's a chance we may get a redesigned website sometime this year. Hopefully far more integrated....
Hey, as long as the order went through its a minor glitch!
Btw, got one of my BYD heatsinks apart finally. Silly thing was not only riveted together, but glued also! No wonder it was so hard to pry apart. Feels/looks like hard grey plastic. Maybe its jbweld? Don't know why they would bother to glue it together. Anyway. Used a hand torch to melt off about half of the grey gunk. Ran out of gas. Always something....
It should make a great heatsink for the balancers. Even the flat plate side would probably work, there's so much metal there. I'll be using the finned side, natch. One or two fans should do it.
14 minutes ago, Sid Genetry Solar said:I'm not too thrilled with SquareSpace...there's a chance we may get a redesigned website sometime this year. Hopefully far more integrated....
So how do we find out what our discount code is? I'm on the page and ready to order two dozen of them.
Just now, Waterman said:So how do we find out what our discount code is? I'm on the page and ready to order two dozen of them.
I need to ask Sean on that. Seems it's back to just him, his helper quit, so he has all the more to do.
5 minutes ago, Sid Genetry Solar said:I need to ask Sean on that. Seems it's back to just him, his helper quit, so he has all the more to do.
Thanks. Did you get the Mica pieces also?
12 minutes ago, dochubert said:Hey, as long as the order went through its a minor glitch!
Btw, got one of my BYD heatsinks apart finally. Silly thing was not only riveted together, but glued also! No wonder it was so hard to pry apart. Feels/looks like hard grey plastic. Maybe its jbweld? Don't know why they would bother to glue it together. Anyway. Used a hand torch to melt off about half of the grey gunk. Ran out of gas. Always something....
It should make a great heatsink for the balancers. Even the flat plate side would probably work, there's so much metal there. I'll be using the finned side, natch. One or two fans should do it.
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I plan to mount mine on the flat side and then blow air over the fins. That should dissipate the heat without problems. I have a tube of thermal grease just waiting.
I plan to mount mine on the flat side and then blow air over the fins. That should dissipate the heat without problems. I have a tube of thermal grease just waiting.
Me too.
Guess I wasn't too clear. I'll not be using the flat plate half of the heatsink assembly (right side of pic) The other half has the fins and the other side of that is flat (left side of pic)
The half of the assembly with fins will be used, fan on fins side, balancers on flat side. It is so massive I could probably put 30 balancers on it instead of the 16 I'll be mounting. Should work great!
34 minutes ago, dochubert said:Me too.
Guess I wasn't too clear. I'll not be using the flat plate half of the heatsink assembly (right side of pic) The other half has the fins and the other side of that is flat (left side of pic)
The half of the assembly with fins will be used, fan on fins side, balancers on flat side. It is so massive I could probably put 30 balancers on it instead of the 16 I'll be mounting. Should work great!
Here are a couple pictures of the one I intend to use. Just need tor remove the transistors. Those are 2N5302 transistors.
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//content.invisioncic.com/g308908/monthly_2021_04/480107228_20210421_1940071.thumb.jpg.5b04c1c74d38b582aac4c6b9e0790ac8.jpg
Should work great too!
20 minutes ago, dochubert said:Should work great too!
Sid said they could dissipate 20 Watts each balancer. Those transistors each were rated at 200 Watts. So that would mean that that heatsink would be able to handle just about anything I could throw at it with 24 balancers.
19 minutes ago, Waterman said:Sid said they could dissipate 20 Watts each balancer. Those transistors each were rated at 200 Watts. So that would mean that that heatsink would be able to handle just about anything I could throw at it with 24 balancers.
Transistors each might be rated absolute maximum 125W heat dissipation per the datasheet...but in some earlier tests, they tended to randomly fail if run near 8A. (EDIT: 8A @ 4v = 32W.) That's largely why the design is limited to 5A.
Looks like you have a nice sizeable heatsink there 😉. If you're running Li-Ion, you might be glad for that size; so far in my experience, it seems Li-Ion constantly needs balanced...while LFP seems to balance down to near zero balance current pretty quickly.
Thanks. Did you get the Mica pieces also?
Not quite. Tracking finally updated for the first time since the 6th of this month...the package of 1000pcs mica insulators is now in Atlanta, GA.
Not like these can't be purchased from the U.S. on eBay or Amazon--just when I ordered 'em, I figured I'd have plenty of time to get all the bits and pieces in time. Seems I miscalculated a bit 😉.
2 minutes ago, Sid Genetry Solar said:Transistors each might be rated absolute maximum 125W heat dissipation per the datasheet...but in some earlier tests, they tended to randomly fail if run near 8A. That's largely why the design is limited to 5A.
Looks like you have a nice sizeable heatsink there 😉. If you're running Li-Ion, you might be glad for that size; so far in my experience, it seems Li-Ion constantly needs balanced...while LFP seems to balance down to near zero balance current pretty quickly.
In my 7S5P pack they have been keeping pretty well balanced with the built in BMSes as long as they get a slow charge. It is when you hit them with 10 Amps at 30 Volts that they tend to not stay in balance. At a 3 Amp rate, they balance themselves fairly well. As each ammo can will hold 2 of those packs, I'll end up making the next ones as 7S10P.
In my 7S5P pack they have been keeping pretty well balanced with the built in BMSes as long as they get a slow charge. It is when you hit them with 10 Amps at 30 Volts that they tend to not stay in balance. At a 3 Amp rate, they balance themselves fairly well. As each ammo can will hold 2 of those packs, I'll end up making the next ones as 7S10P.
Yeah, that slow charge is what's really hard to convince MPPTs to do 😉. These balancers will overload/overheat pretty quickly if slammed with a huge amount of power and inadequate cooling.
I have written a fairly detailed PDF manual for these balancers, if only I could ever figure out how to get it on the website...🙄.
FWIW, Victron and MPP chargers let you set a lower current limit. The knock offs of MPP chargers from Must also seem to do it. The Victron lets the setting be changed in RAM only via the hex protocol commands, but you can also change it in eeprom if desired so it's possible to dynamically adjust the charger output to suit the loads on the system. The MPP charger only has the option of write to eeprom so RWE cycles come into play, but I don't know if applying the settings requires a restart.
Can the GS charger rate be controlled on the fly like that? Feature creep perhaps, but from the looks of it some people might find it useful.