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Can someone please help me with the correct settings for my BMV712
I have 24 x 600AH REX Lead Carbon Nevada batteries connected and 2 x 5000W inverters.
It was initially installed incorrectly and I have since rewired it, but now need to reset the settings so it works as it should.
Thank you so much
Caroline
P.S I have no idea about alarms etc either, complete solar noobie
Just an initial comment ... you said "I have 24 x 600AH REX Lead Carbon Nevada batteries".
You have the the Battery Capacity set at 600Ah on a - I presume - 48V system. Be worth comfirming what battery setup you have as I doubt the BMV battery value is correctly set (I am guessing that should maybe be 3600AH? 24 x 12V 600AH batteries in a 48V setup?)
Have to assume spell check has altered a bit here.
24 x 2v 600Ah Narada REXC cells I am going to assume.
By the operation manual here https://drive.google.com/file/d/1y2pHf7MO5fAidDebQH8VqKAnv78IIDdq/view?usp=sharing
and the data sheet here
https://en.naradapower.com/upload/at/file/20190118/1547778402112657831D.pdf
Change from "Equalise" (cyclic) charge to float is <5ma/Ah so for 600Ah tail current is. 3A or 0.5% (This may be a little optimistic if you have constantly varying loads on the system, in that case I would try something like 2%)
Peukerts Exponent calcs out at 1.08
For these cells in a 48v bank I set charged voltage at 53.8v to allow for temp compensation in a hot climate.
Charged detect time 5mins
Efficiency factor, manual alludes to 105% recharge to full capacity which works out at 95% however I have found this is a bit optimistic. So set it at 90% and monitor.
I would also be checking your charge voltages and temp compensation settings in your system
For cyclic use a 48v bank.
Absorption is 55.2v
Float 54v
Temp compensation is -0.120v/c
Thank you so much @Wildebus @Alan
You have no idea how much I appreciate your time in explaining, thank you.
So I will set my AH at 3600 for the 24 x 2v 600Ah Narada REXC 48v system as advised by @Wildebus
I am a little confused about this.....
"Change from "Equalise" (cyclic) charge to float is <5ma/Ah so for 600Ah tail current is. 3A or 0.5%"
So I will set my AH at 3600 for the 24 x 2v 600Ah Narada REXC 48v system as advised by @Wildebus
This is incorrect, if you have 24 x 2v batteries in series for 48v then you still only have 600ah at 48v.
So it needs to be set at 600ah
