Hello,
I have a 250Ah Lithium battery in my Rv with 4 x 30w and 1x 100w panel with 2 different Victron Mppt. My Rv is parked under the sun and its the battery is always at 100% or a little less. I think everyday there is absorption to 14.2v and then float around 13.6v.
I dont use the RV as I am not there for a few months.
I ve read a few subjects around it. But I am still concerned about the battery doing a lot of charge and no discharge at all on a long period.
Does it damage the battery ?
Should I cut the solar ? Should I remove the battery ?
Is it safe ?
thanks
When you know that you are going to be away for a long period set both the absorption and float voltages down to 13.5V. Once a month give it a charge at 14.2V to maintain cell balance. 13.5V will hold it at about 99% SOC.
ok. thanks. So basically there will be no absorption right , only float ? So no current from the solar?
I presume this is safe practice, you are representing victron ?
U mean the solar panel voltage ?
I think my 4 panels are in parallel and one panel alone on the other Mppt. I dont recall the voltage on the 4 small ones.
No, I do not represent Victron, I am not a Victron employee. If you read the forum guidelines when you joined you would see that the community is staffed by experienced volunteers.
The 23.5V was a typo, it has been corrected to 13.5V, I should double check before posting, this voltage is just below 100%.
If you are concerned and have no loads on the system then you can turn the solar off and leave in storage as long as you have no loads. You could reduce absorption and float to 13.2V as a back.up. See what your battery manufacturer recommends.
I have Victron lithium batteries on my boat, it is on docks for several months over winter, I leave the monitoring equipment running on float voltage and it gets 14.2V charge once a month.