robbob2112
Doing more research, mosty harmless
I see your point, good info.
These fuses ? Still the wrong ones but it appears they do have a DC rating if that is them.
House burned down
- Thread starter Jejochen
- Start date
I see your point, good info.
These fuses ? Still the wrong ones but it appears they do have a DC rating if that is them.
Lighthouse Beacon
Following the Light
Getting ready to drop some Victron Megas into the Victron Power In. Am I dead or what?
ricardocello
Watching and Learning
did you consider these instead? 70v rating
LittelFuse MEGA Fuse - 60A to 300A for 12V/24V/48V Systems | Current Connected
Ensure uninterrupted performance with the LittelFuse MEGA Fuse. Safeguard your 12/24V systems from surges and enjoy peace of mind!
www.currentconnected.com
_voltmeter_
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Lighthouse Beacon
Following the Light
Lighthouse Beacon
Following the Light
Am I ok with the 58 volt fuses?
These say: 125A/58V for 48V
And in have 48v100ah Sungold Wall batteries, info it says:
Maximum cut-off voltage for charging 57.6
Recommended charging 54.5
I’ve never seen the voltage go over 55
Am I ok with these fuses?
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ricardocello
Watching and Learning
Honestly, I had 5 of the 58V-rated ones (clear package) and I thought they were fine, until this House Burned Down thread.
The OP appeared to have them, so I upgraded to the 70v MEGA.
2.5 kA AIC at 70v (littelfuse sf51) is better than 1 kA AIC at 58v (littelfuse bf2)
I would never use MEGA for a battery, just for inverters and MPPTs.
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Lighthouse Beacon
Following the Light
I am still alittle confused by all this? You have the same ones I do? That’s what signature solar recommended for my victron buss. I am surprised they are selling them if they are bad. I called my friend who does solar and ask him and all he said was, “yes those are fine”. I just don’t know. I hate to have to tear all this out and rebuild with Class T Victron Buss, guess I will at some point.
Have to do that one day. I guess I am going to just go ahead and install these for now with a plan to upgrade. I am getting so much conflicting info it’s confusing
ricardocello
Watching and Learning
The 58V-rated ones are not bad, they meet the specifications Littelfuse or Victron publish.
I’m looking for extra protection, and willing to spend money for additional peace of mind.
The 70V rated fuses give me that.
The question isn’t will they work, because they will.
The question is, will they arc and catch fire in extreme cases?
When it comes to fuses, better to have something than nothing, for sure.
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Lighthouse Beacon
Following the Light
Thanks that makes sense. I will run this awhile with plans to upgrade to the class t victron buss
The major problem parallel fuses they give you about 2x the amp rating.
You stll need to fuse the inverter and (fuse -breaker charge controller on battery side if not an all in one inverter.)
Another Fuse or breaker needs to be here TOO. MOST MANUFACTURERS RECOMMEND IT..
This is the fuse used in a battery pack on alibaba
There are 4 things dislike about OP install. These lock nuts have been found to be huge no no for me by years of experience. My experience. Nylon type locking nuts when used in single application in electrical can lock down and seem tight but connection is not 100% tight. Best practice use washers and lock washers under regular nuts. We had to take time away from normal locomotive maintenance to replace fleet of locomotive terminal board lock nuts. They had also factory stacked the big leads between nuts. They had been failing left and right out on the rail pulling freight. Best practice don’t do it. Best- Don’t use single nylon lock nuts and do not stack with steel nut sandwich.
Not sure how this is actually stacked but no big leads should ever be stacked and sandwiched between other nuts. Steel gets hot not as conductive. Again years of experience. There are electrical spacers for sandwiching lugs. Best practice is avoid it. Again not 100% sure the big lead is sandwich.. signal wires small wires no basic draw might be alright - done it …. Thread engagement is important too. I hope there are washers under all nuts on right …they need to be bigger for clamp force. My opinion. My experience. Signal - or whatever small wire should been put with other small wires.
I watched a video… best part was guy saying “2x times a year go around check all connections” do inspections. Don’t remember who it was in video. Sage Advice. We have to have caution not fear. We learn everyday. Make a log book of your checks.
This is not 100% you either deal with it or accept something else as more safe. Sorry nothing is 100% safe. Storage engery is dangerous. The fuse might not have been the source of problems the OP reported fireman said. “That fireman could have been wrong”
Normally fuses don’t just pop. Normally. If not rated right get nuisance pops.
You stll need to fuse the inverter and (fuse -breaker charge controller on battery side if not an all in one inverter.)
Another Fuse or breaker needs to be here TOO. MOST MANUFACTURERS RECOMMEND IT..
This is the fuse used in a battery pack on alibaba
There are 4 things dislike about OP install. These lock nuts have been found to be huge no no for me by years of experience. My experience. Nylon type locking nuts when used in single application in electrical can lock down and seem tight but connection is not 100% tight. Best practice use washers and lock washers under regular nuts. We had to take time away from normal locomotive maintenance to replace fleet of locomotive terminal board lock nuts. They had also factory stacked the big leads between nuts. They had been failing left and right out on the rail pulling freight. Best practice don’t do it. Best- Don’t use single nylon lock nuts and do not stack with steel nut sandwich.
Not sure how this is actually stacked but no big leads should ever be stacked and sandwiched between other nuts. Steel gets hot not as conductive. Again years of experience. There are electrical spacers for sandwiching lugs. Best practice is avoid it. Again not 100% sure the big lead is sandwich.. signal wires small wires no basic draw might be alright - done it …. Thread engagement is important too. I hope there are washers under all nuts on right …they need to be bigger for clamp force. My opinion. My experience. Signal - or whatever small wire should been put with other small wires.
I watched a video… best part was guy saying “2x times a year go around check all connections” do inspections. Don’t remember who it was in video. Sage Advice. We have to have caution not fear. We learn everyday. Make a log book of your checks.
This is not 100% you either deal with it or accept something else as more safe. Sorry nothing is 100% safe. Storage engery is dangerous. The fuse might not have been the source of problems the OP reported fireman said. “That fireman could have been wrong”
Normally fuses don’t just pop. Normally. If not rated right get nuisance pops.
robbob2112
Doing more research, mosty harmless
Got a new toy to measure temps with -- waiting on an arm to hold the thing steady on my work bench. Then I will test some fuse resistances before and while current is running through them.
The heatgun is the hot spot at the top, that is a MRBF fuse (3), the lug connected to the battery (1) , the victron temp sensor for the shunt (2).
Amazingly vivid.
Where did you get the new toy.
Few years back there were free phone apps. Last looked the apps were no longer there for free. The FLIR The actual thermal cameras use to be expensive….but prices have dropped. The laser temp readers use to be expensive too. FLIR app and Camera can be sync’ed with phones.
Not sure why they did away with free apps that used camera in phone. Maybe money or something else.
Next thing we know someone will - might invent a thermal camera monitor for these systems that send alerts via phone and or do emergency shut down. Hmmmm.
robbob2112
Doing more research, mosty harmless
FLIR 1 pro - wanted the higher resolution and extra mode.
I just happen to have an old Galaxy A7 in a drawer so I can use it when testing things as the display.
Funny they still call it FLIR (Forward looking Infrared) - Seems like calling it a thermal camera might be more accurate these days. Especially with the color overlay verse the old black and white version.
My airplane had a FLIR turret - fly along and drop it out the belly and look around - had to be changed periodically when the liquid nitrogen inside leaked out. Back early 90's it was $250k a copy and my team replaced 1 of them 4 times. Good thing we had 8ft extender cables so we could hook the new one up in the aluminum can before install.
First 2 didn't work.... third one came with sea water sloshing around in the can and the 4th one worked.
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_voltmeter_
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robbob2112
Doing more research, mosty harmless
And it is going back, having to depend on an android app is causing difficulties. It won't work with my 3 year old phone.
Ordering a different one.
42OhmsPA
What's in a title?
Check out Uni-T.
I've been happy with this one I ordered back in November, no issues on my Oneplus 6T. App isn't invasive like many others I looked at. They also have some nice standalone.
Resolution isn't as good as the FLIR pro, it's much nicer than the regular FLIR I use at work with an iPhone.
PotusGobbleBottom
Corn Pop was a bad dude.
I got this one and it is nice. never used a FLIR tho
What do you think the fuses are for? Or are you saying don’t use fuses?
Let me guess you are going to say “fuses protect the wire?” I’ve seen ppl say that here. It is an incomplete statement.
Wires are sized for the load so fuses are load based on the wires - lead which are load sized. Schools started screwing ppl up by traching breaker and fuses to protect the wire. The wires are sized for the loads. Thus fuses-breakers .
Victron provided OP the instructions needed to set it up.
You either put a fuse there or you put a breaker as shown. Victron stated Fuse. Fuses are cheaper than breakers and the contacts don’t weld up. If fuses are properly sized and chosen they protect the wire and everything. The saying fuses and breakers protect the wire- lead is incorrect because of omission based on load.
Victron shows and states Inverters are suppose to have a 200 amp fuse and battery wire cable lead of sufficient cross section.
You put 6 each 200 amp fuses in parallel with the inverter and wiring then you have exceeded the manufacturer recommended 200amp fuse instructions. You now have a bus bar with 1200 amp feeding inverters that were instructed to be fused at 200 amps with lead for cross section to handle the potential load. Yes? or No?
OP added a 7th string with potential 1400amp on the dc positive buss bar
Think OP stated added correct fuses up stream. Not sure where read it. “This system operated without problems for few years.” As stated by OP
Victron also states do not put the battery cable wires in conduit. Suspect They want Free air due to heat.
TO add more some if not most inverters will have internal fusing built into them. They are trying to prevent major damage fires which will result in loss of business or law suits..
If you really want to be picky the fuses Victron wanted for inverter then proper cross section should been mounted on buss bar….then 3 leads connected to the fuses.
