What's going on here???

[ThreeBridgeT6]

I'm hoping some of you electrical wizards (like @Dellmassive) can give me some pointers here, as I'm stumped. Van's been sitting on the drive quite happily until this week, when I began to notice battery drain on both starter and leisure (twin 100Ah LiFePo) through my BM2 and Simarine battery monitors. I've got a 180W solar panel on the roof that has been keeping both starter and leisure batteries full during this spell of good weather, and I've had a meter on it to confirm that it's delivering about 22v. However, my Simarine monitor shows that 0.0A is being put in to my batteries from the solar. As things were getting low I hooked it up to the mains yesterday morning and went about my day. Late afternoon the starter battery is showing 100% on the BM2 but the leisures are still only at 77% and only charging at a rapidly fluctuating 1.35A to 2.63A. I therefore left it hooked up overnight and this morning they were still only at 94%. I then checked my BM2 and found this most unusual plot...... Can anyone explain that sudden drop off to 9V between 12.30pm and 6pm yesterday?

 

[Dellmassive]

looks like a glitch in the Matrix . . .?

just the BM2 having a spaz-out? (from 12:30 till 1800hrs?)

can you post a 7day BM2 readouts to see can see the battery trend over a week?



....


looking at the plot above it looks like you have connected a EHU charger to the van starter battery.

it started at 12.0v static volts.

charger connected at 9.30am? and left connected all night? - float voltage of 13.3v ish?

+++

i can really see an issue on that 24hr plot.


post a weeks worth so we can look again.

 

[ThreeBridgeT6]

looks like a glitch in the Matrix . . .?

just the BM2 having a spaz-out? (from 12:30 till 1800hrs?)

can you post a 7day BM2 readouts to see can see the battery trend over a week?



....


looking at the plot above it looks like you have connected a EHU charger to the van starter battery.

it started at 12.0v static volts.

charger connected at 9.30am? and left connected all night? - float voltage of 13.3v ish?

+++

i can really see an issue on that 24hr plot.


post a weeks worth so we can look again.

Thanks @Dellmassive. I'll go and get 7 days worth now...... back soon!

 

[ThreeBridgeT6]

looks like a glitch in the Matrix . . .?

just the BM2 having a spaz-out? (from 12:30 till 1800hrs?)

can you post a 7day BM2 readouts to see can see the battery trend over a week?



....


looking at the plot above it looks like you have connected a EHU charger to the van starter battery.

it started at 12.0v static volts.

charger connected at 9.30am? and left connected all night? - float voltage of 13.3v ish?

+++

i can really see an issue on that 24hr plot.


post a weeks worth so we can look again.

OK... here's a week's worth. Strangely, there's a complete absence of data on the 16th/17th together with another dip down to 9V (which I suspect is just the range limit on the BM2 - it probably drops right off the scale) 3 days ago which I hadn't noticed, and now the PV seems to be charging the starter battery once more as it's showing 13.25V and 'charging' on the BM2.

 

[prog99]

Did you use different devices to check the bm2? That’ll definitely cause the weird history.

 

[ThreeBridgeT6]

I'm beginning to think that the BM2 is dodgy - here's another from yesterday and this morning. I disconnected the 230V hook-up just after 10am, and the starter battery drops from a charging level of 13.5V down to around 12.25V. It then looks like it's getting a trickle from the PV, but then at mid-day it suddenly jumps right back up to 13.5V without me having done anything. It's as though I've just plugged it back in. This of course is the reverse of it dropping off the scale for several hours whilst on hook-up. This morning it's showing that the starter battery is 'Low' at 60% (bear in mind it was on charge for 24 hours and hasn't been anywhere) and it appears from the jagged track that it's getting a little from the PV. However, my Simarine shows that it's getting 9/10ths of bugger all even though the sun's beaming down on the roof - yo-yoing from 0.19A to negative 0.04A.

@Dellmassive - any thoughts??