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I have an MPPT 450/100 & a Smart Shunt 500ah with 1040ah @48v of AGM Batteries (increasing to 1560ah by the end of the year), i use about 17kwh per day, is it OK to leave the Tail Current set to 4%?
Everything has been left on recommended setting for AGM, sorry to ask this when i am sure it's been covered before i just can't find it.
This is an off-grid setup.
Dave.
I would reduce this down to 1%-1.5% for AGM to make sure that they really are full before going to float. Some AGM manufacturers specify as low as 0.5% tail current. My boats AGM bank is set at 1%. The first time you do this make sure that the tail current will go this low, if the batteries are aged then they may settle at a higher tail current.
I think these values are from shunt/battery monitor, not charger.
Charge efficiency is probably a bit high. Maybe knock it down to 90%
If you're getting enough prolonged cloud to reduce charge current to below the tail current, you may want to increase charge detection time to prevent false positives.
Thank you i will do that.
The batteries are all new.
Cheers
Dave.
Hi just checking does this looks ok to you?
Thank you - done.
Dave.
Just to confirm that the Smart Shunt has priority over the MPPT 450/100 and controls the charging?
Or do i need to match this too? sorry to be a pain just want to ensure its all set-up correctly.
Dave.
The shunt does not exert any direct control.
In systems with a GX device, DVCC enabled, current measurements from the shunt will be used to limit MPPT output.
The settings in previous posts are aimed at getting the monitoring side to give accurate battery state of charge readings.
Ok thanks for all your help, i have a GX Cerbo with DVCC enabled so i think all is good.
Thanks again for your help.
Dave.
