Battery problem?

**Pedro_The_Swift** · 26th December 2022, 09:03 AM

This is this mornings,
fridge is on, laptop charging from 700w Inverter, sleep apnoea machine working off battery.
Thats it. So not charging. But its not draining it as fast as after sunset.. the drop is probably the inverter kicking on.. the power brick for this laptop( GE 76 Raider) is 380W.

I still have Batt number 3 disconnected... no odd charging cycle with the other two unplugged..

**drivesafe** · 26th December 2022, 12:34 PM

Once again, unless that battery is in the final stage of discharge, the voltages are totally out of wake for a lithium battery.

Even a small lithium battery will hold at around 13.1v with a 30 amp load applied.

You have a much larger battery and a smaller load yet your battery voltage is all over the place.

Again, if it were my battery, I would be looking at the battery's internal BMS because lithium batteries do not behave like yours is.

**Pedro_The_Swift** · 27th December 2022, 09:40 AM

Being lithium I'm sure it has a BMS,,

can I access it??

No...

I put a meter on the connected batts this morning,( dont ask... ;( )
the Victron software was around ONE volt higher than the meter..

The cable running from the controller to the batts is the same from the roof panels to the controller( and NOT upgradable... no point the Victron wont accept bigger cable)
5mm external Dia..

cable run from controller to batts?
maybe 4m ??

waiting on Mitre10 to open, need longer M8 bolts on the batt terminals,

Bought a Victron BMV700, probably be 3 weeks before I can get it installed though...

**Tins** · 27th December 2022, 10:21 AM

Originally Posted by Pedro_The_Swift

Being lithium I'm sure it has a BMS,,

can I access it??

No...

Well, you can...

**Pedro_The_Swift** · 27th December 2022, 10:50 AM

12.86 on meter, 14.2 on software..

**Pedro_The_Swift** · 27th December 2022, 11:59 AM

2 hours later and the batts are still at 12.86.
I dont think its charging at all..

**Pedro_The_Swift** · 27th December 2022, 01:41 PM

Fired up the Yamaha and put the charger on.. this in the middle of a sunny day..

**Pedro_The_Swift** · 27th December 2022, 02:46 PM

After 2 hours of Yamaha charge its up to 13.2 on the meter..

**drivesafe** · 27th December 2022, 05:32 PM

Originally Posted by Pedro_The_Swift

After 2 hours of Yamaha charge its up to 13.2 on the meter..

That’s an improvement.

Keep the charger on until the battery rises over 14.0v.

Anything under that and your battery will only be partially charged.

Also note, watch the charge and once the battery charging voltage is over 14.0v make sure the charge current drops below 1 amp before stopping the charge.

Depending on the type of charger, lithium batteries can site at say 13.6v for hours and then rise over 14.0v, but the battery will still be charging, until the current drops as stated above.

**W&KO** · 27th December 2022, 07:04 PM

Has the battery manufacturer offer technical support……..

Squinting at the pics are the batteries iTech World??

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