Lithium batteries - inaccurate readings (charging / usage)

[bono]

Hi Guys,

I have 400 Ah lithium power bank from Elite Power Solutions. This past weekend the system started acting up. A couple of examples:

- when charging: the charge controller was showing 13 A. At the same time the system monitor showed 1.1 A charging (nothing major was plugged in);
- when discharging: microwave shows 9-10 A burning on the monitor, instead of >100 A as previously. The same with electric kettle - shows 10-12 A instead of 140 A;
- in the morning the system showed 98% battery full, when usually I was using 5-10% overnight, depending on how often the furnace was on.

All systems work, but the readings are off. Any idea where to start?

Thank you!

[Seann45]

Did you get that panel from Solar Mike? If so phone him and talk to him.

[bono]

Yep, Solar Mike installed everything 2.5 years ago, but all hardware was from me. I will call him. Thanks!

[bono]

Called Solar Mike. He suggested that the cables connected to shunt may need sandpaper treatment. I did not have sandpaper with me, but I disconnected and connected a couple of cables and it appears that everything works as it should.

Great guy and again I cannot recommend him more.

[Seann45]

Originally Posted by bono

Called Solar Mike. He suggested that the cables connected to shunt may need sandpaper treatment. I did not have sandpaper with me, but I disconnected and connected a couple of cables and it appears that everything works as it should.

Great guy and again I cannot recommend him more.

Yep Solar Mike at www.thesunworks.com is the best