houseofancients
Solar Wizard
Which is absolutely fine , for those other reasons
I don't want a jk , for other reasons, then again we all have our prefs
House burned down
- Thread starter Jejochen
- Start date
I don't want a jk , for other reasons, then again we all have our prefs
Effectively, 7-15kwh batteries using all one singular BMS? That doesn’t sound fun at all
It's a Batrium, they are designed for that and more.
PotusGobbleBottom
Corn Pop was a bad dude.
Oh my !
Brucey
Solar Wizard
I don't think running seven strings in parallel like was being done is a supported configuration from Orion. I believe they would spec one watchmon and shunt per string, not one watchmon and then multiple parallel strings.
Brucey
Solar Wizard
I don't really know much about Orion Batrium but my understanding is per normal specification each string of 16 cells would have a watchmon, and multiple blockmons, and a shunt. If there's an issue with a cell in the string the shunt will open and that battery is isolated.
Using 112 Blockmons (one on each cell) to a single Watchmon still does not sound fun.
Here’s the wiki for just the Blockmon, this wiki makes me now ponder more possibilities of the OP set up and potential failure points.
Batrium has a 17 page document specifically about parallel systems
In the OP build thread @Ampster says he too was running a single batrium on 2 packs and was facing some difficulty. Idk what his resolution was, but at the time he mentioned adding more BMS instead of sharing
In the OP build thread @Ampster says he too was running a single batrium on 2 packs and was facing some difficulty. Idk what his resolution was, but at the time he mentioned adding more BMS instead of sharing
This gives me an idea how to better protect parallel batteries. Install current shunt or hall shunt and contactor on each series string. If current sharing suddenly deviates from equilibrium then disconnect offending string. Doing this prevents other good strings from dumping current into shorted string. The hardware to do this already exists on rack batteries in their BMS boards making this only a question of firmware modification.
I bought a flir, but what is considered "hot"?
robbob2112
Doing more research, mosty harmless
btw - this is the rockwool I used for the 3d printer enclosure.
Made for a very quiet and flame proof setup. Running on a stainless steel workbench
Made for a very quiet and flame proof setup. Running on a stainless steel workbench
Brucey
Solar Wizard
Almost every page of that document warns against running multiple strings in parallel without taking specific safety measures to be able to disconnect each string automatically, the section about the dangers of eddy currents foresees an issue where a single cell failure could cause a cascading issue that moves from string to string.
robbob2112
Doing more research, mosty harmless
Which brings us full circle back to the idea of
Cell shorted/vented for unknown reason, fuse blew/melted/caught on fire, then everything went out of control.
OP was using the fuse type that Victron recommended.
I think we as a group generally think a class T on each string would have let the bad cell fail without taking all the other strings and the house with it.
Many possible causes of the cell vent, no way to dig any deeper with what is left
Brucey
Solar Wizard
Batteryhookup has the tyco 500A relays for peanuts if you weren't aware, they have a version with fuse already attached sometimes.
TE Connectivity EV200AAANA 500a 0-900vdc Tyco 12/24v
These were recovered from EV battery modules. These are VERY EXPENSIVE online. If you have any project that needs a high current relay this is your chance to save some money. Make a cheap 30a BMS into a 500a BMS. This will work for batteries in the 9-36v range so perfect for Lifepo4 and Lithium...
batteryhookup.com
robbob2112
Doing more research, mosty harmless
Batteryhookup has the tyco 500A relays for peanuts if you weren't aware, they have a version with fuse already attached sometimes.
TE Connectivity EV200AAANA 500a 0-900vdc Tyco 12/24v
These were recovered from EV battery modules. These are VERY EXPENSIVE online. If you have any project that needs a high current relay this is your chance to save some money. Make a cheap 30a BMS into a 500a BMS. This will work for batteries in the 9-36v range so perfect for Lifepo4 and Lithium...
you must be listening to @timselectric - he is the contactor king.
Ampster
Renewable Energy Hobbyist
I have always run an Orion BMS on a single pack. Initially it was 2P16S and then 3P16S. The only issue I had was since these were Grade B cells the meager balancing current of the Orion could not make much of a dent in a group of three parallel cells totalling 840 Ahrs so I disabled the balancing on the Orion and used a JK 2 Amp active balancer. Other than that the Orion was robust with a 400 Amp contactor and a very accurate Coulomb Counter.
robbob2112
Doing more research, mosty harmless
So, dumb question - when running the Orion BMS how much current can be drawn from the batteries? He is using 280ah cells in 16s configuration. I don't think he ever mentioned an exact brand?
But what would be a safe assumption of the C rating of the battery strings?
But what would be a safe assumption of the C rating of the battery strings?
Ampster
Renewable Energy Hobbyist
The Orion BMS uses a contactor and the limit can be set by the user subject to the capacity of the current shunt used. However I did not see anything that said the OP was using an Orion BMS. I thought it was a Batrium?
Brucey
Solar Wizard
I believe the smaller shunt is rated for 400A but can handle 500A for short periods.
Crap, this might be my fault. I thought the two were the same.
I thought one was the company name and one was the series of product
