Lithium battery discharge

[125BEER]

Hi,away in greece and our setpup has been working fine 280ah battery with solar.
Last two days we have had 2 sunny days all good.Watched a bit of tv before bed,in the morning "low voltage warning".Tv off before bed and AUX off at panel.Yesterday morning battery voltage 10.74v and similar this morning.
Checked the terminals of battery all good.
Have I missed something.Nothing plugged in over night....battery now 13.04v and rising running engine.
Below screenshots of solar and battery levels

Yamas

 

[Carpmart]

I suspect that you’re just not generating enough power for your energy demands. The battery has been depleting and you’re not putting enough back in!

 

[125BEER]

I suspect that you’re just not generating enough power for your energy demands. The battery has been depleting and you’re not putting enough back in!

Fair point,been fine upto 2 days ago
Thanks for replying

 

[Kannon Fodda]

Weather may be "sunny" but your solar isn't actually generating that much at only 250Wh a day max.

The solar shows the battery is only in bulk charge mode, not getting to absorption. So it's some way off being fully charged.

On the smartshunt stop focusing on the voltage instead look at the actual capacity in Ah available and you'll work out how long the solar needs to recharge, or how many hours to go driving. With a 280Ah battery that is now flat you will need to be driving for many many hours to refill it if you have the average 30A B2B. I suspect you need to find somewhere with a hook up.

The battery volt rise with engine on is simply the shunt seeing the charger. Switch engine off and that voltage may fall back. Voltage on lithium is quite a flat curve from max full charge at 13.6V until close to flat so not a great guide as to energy stored.

 

[Pausim]

Daily solar output of 225Wh is only about 17.5Ah which is a very small charge for a discharged 280Ah battery, about 6%. Even in Greece roof mounted solar is not going to achieve a lot at this time of year. It is not only the hours of sun that matter but the angle the sun hits the panel.

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