400i system with 2-100ah lithium capacity

[arnoldvalencia]

I have ‘24 3123rl with a 400i solar system, 2-100ah lithium batteries, and a 100/30 inverter. I took it off shore power for about 24 hours before i got the warning that i was about to hit 10.5v During the 24 hours I ran the inverter to power the fridge and also ran the ceiling fan for about 3 hours. I had periods of sun throughout the day . Is it normal for battery to drop down that quick?

 

[AZ Traveler]

Arnold,

If you install a good battery monitor you will be able to see amps going into your batteries from solar and what is coming out to run your refrigerator, fan and anything else that may be using power.

What kind of fridge do you have and if it is the discontinued absorption type are you running on gas or electric? I assume your 24 has the 12 v compressor model.

With 6-8 hours of good sun, a refrigerator that had already cooled down and 3 hours of ceiling fan I would generally expect more than 24 hours of power.

 

[foldbak]

I have ‘24 3123rl with a 400i solar system, 2-100ah lithium batteries, and a 100/30 inverter. I took it off shore power for about 24 hours before i got the warning that i was about to hit 10.5v During the 24 hours I ran the inverter to power the fridge and also ran the ceiling fan for about 3 hours. I had periods of sun throughout the day . Is it normal for battery to drop down that quick?

The 100/30 is the solar controller. Your inverter is most likely a Dimensions 2000 watt. If you have 200 AH of lithium and your inverter is on, with the ceiling fan and fridge, yes you will deplete the batteries without proper charging. I have the same system that I upgraded to 720 watts. I never run the fridge on 120 volts dry camping. It's always on LP. At the coast with 75% sun my batteries will charge to around 90% by the end of the day. I run the gen about 30 minuets a day. Prior to the solar upgrade I ran the gen around 1.25 hours a day. You need to do some power management and monitor your batteries. Mine have never gotten below 12 volts.

 

[LeftOverParts]

You you don’t have it already, you can download the Victron App to see the details on your solar controller and shunt. If your components don’t have Bluetooth built-in, you should be able to buy the Victron Bluetooth adapter to plug in.

You mentioned “periods of sun”. Here’s a picture or our controller and you can see the difference. Today is shore power, yesterday was a full sun all day while traveling with the resi fridge running. Day before was fridge start and packing, but late afternoon so low sun angle. Far right is inside lights on, partially cloudy.