Wondering what battery settings in the smart shunt settings that would show an increased speed at which the battery percentage reading would show.
For example would increasing or decreasing the Peukert number make shunt show faster discharge rates?
What about charge efficiency. Would 90% show slower discharge rates?
Is there any other ways to fine tune these settings?
My bms is showing much lower battery percentages than the smart shunt and I’m lookin for a way to increase the shunt readings to match bums. Thanks
In the first instance i would trust the bms.
Ofc only if connected exactly to guide (one and ony one connection on battery minus going to shunt) and all parameters entered correctly, especially “charged voltage”.
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Hi. Peukert is the one you’re looking for. For most people (ie. those with a discharge rate of less than C20), reducing it will speed up the reduction in SOC.
A neat feature with this is that a setting change will recalculate SOC, so you can try settings without waiting for natural discharge.
The default 1.25 is for Pb batteries, and that’s usually too high anyway, even for them. It’s quite possible that the bms doesn’t even consider Peukert, so 1.0 is worth trying for starters.
Charge Efficiency applies to the speed at which it returns to 100% from a discharged state (maybe try 99% there). You’ll have to wait with that one.
Lowered it down to 1.00 and seemed to change percentage quicker. Thanks
Something is still off after trying 1.00 for peukert. Wanted to go through a couple charge and discharge cycles before i reported back.
Today after a full discharge cycle the smart shunt is stating 80% and bms is stating 20%.
I have 4 - 12v batteries wired in series to equal 600ah (150ah x 4) when i change the total battery capacity setting to 150 the smart shunt goes to 20%. Which matches bms.
Any other ideas? thanks
Ah isn’t a true measure of energy without a specified V. You either have 600Ah @ 12V, or 150Ah @ 48V.
If you have 48V, no surprise the shunt won’t show much SOC movement when set to 600Ah.
Looks like a calculating error on the total ah capacity to give me that slower discharge rate
I have it set to 150 ah now and will be adding an additional 4 150ah batteries this week in a parallel configuration
Which will increase my total ah at 48v to 300
Right?
Yep. For unknown LFP’s, Victron suggest starting at 1.05 Peukert and 99% Charge Efficiency. Have fun tuning it in…