DPC
Solar Enthusiast
Ya but I made that fuse holder not that long ago....That looks a lot like the vintage fuse on my 1965 drill press.
Not in the 60s maybe in the past 20 years lol.
Ya but I made that fuse holder not that long ago....That looks a lot like the vintage fuse on my 1965 drill press.
Apparently there is a "steam" setting on the Nests to avoid false triggers from showers etc, and therefore they didn't trigger on the smouldering fire.do we know OP's pack rough current drawn at that fateful wee hour ? and was there not a smoke alarm ? or the Nest supposedly served that purpose ?
so a regular non-smart fire/smoke alarm would be better ?Apparently there is a "steam" setting on the Nests to avoid false triggers from showers etc, and therefore they didn't trigger on the smouldering fire.
do we know OP's pack rough current drawn at that fateful wee hour ? and was there not a smoke alarm ? or the Nest supposedly served that purpose ?
What would it take to drop a 98kWh battery from 53.20 to 52.70? Potentially lower than that but VRM resolution may not have caught it. Just the surface charge coming off?He posted a Victron graph somewhere about page 20 that showed thing fine, the a large current spike and back to normal, then 20 minutes later it went offline.
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House burned down
No, we only know that the fuse blew and arced, and that the fire inspector said that was the cause. And given the amount of destruction we will never know for sure. The records from the batrium about cell voltage burned up with it. Had that survived it could prove/disprove the theory of a...diysolarforum.com
What would it take to drop a 98kWh battery from 53.20 to 52.70? Potentially lower than that but VRM resolution may not have caught it. Just the surface charge coming off?
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that could be possible the cell short happen slowly so the dumping current rise slowly the fuse had no chance to protect the battery.My assumption was a cell shorted and the others started dumping into that string. The cell vented and fuse blew and the fire started.
That problem was fixed in a firmware updateAround the 2:40 mark he talks about JK BMS being a failure… and how they are over charging because reset…after few days being off.
Hmmmmm… What now?
Yep, it was a big deal when it first came out. Older JK's didn't have that problem. The problem was quickly addressed with the firmware update.That problem was fixed in a firmware update
But it was a problem that should never have been unleashed until tested and proven for a bms. Not good.imagine not knowing …. Would they send out notifications? Recalls? Hmmm imagine your house burned down due to faulty bms. Anything can happen.That problem was fixed in a firmware update
Yes BMS is safety critical and really not a realm for experimentation or bleeding edge shenanigans imoBut it was a problem that should never have been unleashed until tested and proven for a bms. Not good.imagine not knowing …. Would they send out notifications? Recalls? Hmmm imagine your house burned down due to faulty bms. Anything can happen.
He has been having lot of problems with building batteries lateries lately.
I often wait to see what others find before diving in. Some ppl like to make smoke and be trail blazers….trying new stuff.
problems happen, it is important how the company solve them.But it was a problem that should never have been unleashed until tested and proven for a bms.
I often wait to see what others find before diving in. Some ppl like to make smoke and be trail blazers….trying new stuff. I usually wait and see.
I grew tired of Extreme Sports in military. Realized we create and promote things as Safe when they they are really not. Stored energy like anything has rules and procedures. My biggest reason for posting that is even BMS vs Batrium can fail. We are depending on mosfets to act as the switch. They eventually break down like old incandescent light bulbs use to after number or cycles or events. Our inverter also break down. Just a matter of time for learning the limits. Glad you took the chances in some ways we have learned. You recommend T Class fuses but yet some ppl still scorn them. A bms would have dealt with a bad cell and cut power but Batrium should have too.These are the merits and pitfalls of DIY. Some of us will take the risks. I was one of the first to use the original style JK in production, especially with multiple in parallel. I like doing this - I like smoke and bleeding edge shenanigansI take stuff apart when they break, analyse issues/fix them, etc. and share these. I fixed several member's JK when they had the CPU AUX error (after I identified the issue being a buck converter), and fixed one or two where the cell count was incorrect due to burnt resistors.
My entire first built I documented here was an jump into the abyss. Very few of us were buying those EVE cells, no one really knew where they came from, quality, vendors to use, etc.
In the end, I'd like to think a lot of people on this forum benefited from these exploits some of us got into, and helped create a market for DIY stuff that was quite fringe back then with 'shady deals in the back alley' so to speak. Yes, things are not perfect - but they're so much better now than they were 5 years ago...
My system is also for black out situtation, the challenge is operating multiple cloudy/stormy winter days, as our main heat source is mini-splits. My current temporary solution is to tap the big EV's pack. But my meager 8kwh home pack is kept between 35-75% SOC, just don't want to stress the cells. I believe OP probably maximized the pack range, but the system has been operating well for a number of years...until it didn't.Been looking at increasing capacity so can add more run time- longer operation. I want reserves to run things longer…. not run more stuff.
I want reserves to run things longer…. not run more stuff.
JK and Seplos are big names in them.
what improvements would you incorporate ? It would be nice to include triggers by dI/dt and dV/dt, rate of change in current & volt, beyond some acceptable/programmable in-rush-surge ?Part of me (and I've said this before) wants to build the BMS as an Open Source version. It's not even that hard, and I already have several improvements in mind, but I just don't have the time (or energy to be honest).
what improvements would you incorporate ? It would be nice to include triggers by dI/dt and dV/dt, rate of change in current & volt, beyond some acceptable/programmable in-rush-surge ?
you can use a bms with a contactor or control a contactor additionaly to the mosfet bms with an other circuit.We are depending on mosfets to act as the switch. They eventually break down like old incandescent light bulbs use to after number or cycles or events.
you can use a bms with a contactor or control a contactor additionaly to the mosfet bms with an other circuit.
what do you want to say, the fet bms or batrium is not reliable enough? so we dont need to use it?
redundancy also add complexity, more components, more failure opportunities...a balancing act for sureAnd of course every added item inline adds impedance and that means more wasted energy in the form of heat and more cost.
i dont think so.more failure opportunities
Ordered 2 of them to play with. More fun in the sun.