Lithium battery discharged for no reason

[Nabsim]

Don't forget though there are shunts and there are shunts. The cheaper ones are not smart enough to keep accurate SoC with low power draw, won't register it at all. Have a look at Will Prowse videos, he recently did one on Shunts and the only one that was accurate that he tested was the Victron. Of course you have to decide if you need that accuracy for the cost. Vids worth watching no matter what as you will know what to do if you go for the cheaper ones

 

[Steve and Julie]

I was having a quick look at the wires coming out of the victron controller were they disappeared into this Hidden compartment in the locker and found that the fuse has melted so that's why the controller isn't working i wonder what caused that?.

 

[jeffmossy]

I was having a quick look at the wires coming out of the victron controller were they disappeared into this Hidden compartment in the locker and found that the fuse has melted so that's why the controller isn't working i wonder what caused that?.

Probably the wrong size diameter wiring that has been fitted, that is why I it needs ripping out and starting from scratch with the correct wires and fuses

 

[Steve and Julie]

Don't forget though there are shunts and there are shunts. The cheaper ones are not smart enough to keep accurate SoC with low power draw, won't register it at all. Have a look at Will Prowse videos, he recently did one on Shunts and the only one that was accurate that he tested was the Victron. Of course you have to decide if you need that accuracy for the cost. Vids worth watching no matter what as you will know what to do if you go for the cheaper ones

I will get a victron smart shunt as I've already got the app for the solar and b2b I know they are a bit more expensive but they are a trusted brand with a decent warranty plus we get discount from alpha who I bought all the other victron stuff from

 

[Steve and Julie]

Probably the wrong size diameter wiring that has been fitted, that is why I it needs ripping out and starting from scratch with the correct wires and fuses

Yes definitely will sort it Jeff it was probably ok for the old pwm controller but not for the victon replacement . I checked the paperwork and it was professionally fitted in 2009 so a few years ago

 

[MERL]

Don't forget though there are shunts and there are shunts. The cheaper ones are not smart enough to keep accurate SoC with low power draw, won't register it at all. Have a look at Will Prowse videos, he recently did one on Shunts and the only one that was accurate that he tested was the Victron. Of course you have to decide if you need that accuracy for the cost. Vids worth watching no matter what as you will know what to do if you go for the cheaper ones

I personally have a cheap Ai-Li Shunt Neil and I've never wanted anything 'better' TBH. Yep it's not perfect during layup and dosent 'See' the tiny loads but when we're using the van in every day life it's fine because it syncs to 100% every time the battery gets charged and so those tiny loads aren't significant any more. It's very accurate and of course it has a proper screen which i prefer over a phone app...the screen is a little small though and needs to be mounted at eye level really but for £25 it's great I find.

 

[MERL]

I was having a quick look at the wires coming out of the victron controller were they disappeared into this Hidden compartment in the locker and found that the fuse has melted so that's why the controller isn't working i wonder what caused that?.

What size fuse was it?
Is the fuse in the battery side or solar side of the SCC?
What's the size of your solar panels?
I hate to ask but what's the size of the wiring wiring between battery and SCC? (not a lot I'm guessing from what Jeffs been saying )

 

[molly 2]

,, I personally have a cheap Ai-Li Shunt Neil and I've never wanted anything 'better' TBH. Yep it's not perfect during layup and dosent 'See' the tiny loads but when we're using the van in every day life it's fine because it syncs to 100% every time the battery gets charged and so those tiny loads aren't significant any more. It's very accurate and of course it has a proper screen which i prefer over a phone app...the screen is a little small though and needs to be mounted at eye level really but for £25 it's great I find.

Probably the wrong size diameter wiring that has been fitted, that is why I it needs ripping out and starting from scratch with the correct wires and fuses

It could be a poor quality fuse holder that has over heated and melted