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I have a Smart Solar 75/15 and a 100/20. Both are to 12v nominal with temp compensation turned off (at the moment)
I also have the bluetooth temp/voltage sensor.
I'm finding that the 75/15 is pumping out over 15v whilst the 100/20 stays comfortably within my set limits. This is despite both controllers being set to 14.74v for absorption and 13.5v for float.
So are these both connected to the same battery bank?
And you have a smart battery sense fitted?
If so are both MPPT in the Smart Network? I ask because only 1 has the Smart Network symbol, but that MPPT has no battery temperature displayed...
The 2nd MPPT is still in absorption phase, so if connected to the same battery is still holding the voltage high, dispite the 1st being in float.
I'm not too sure yet why the 1st is showing a higher voltage. Could be to do with not both MPPT's being in the Smart Network.
has the latest 1.41 Fw been installed. and is everything on the latest F/W
also try disconnecting all the Bluetooth devices and then re setup the smart network
Check the voltage readings AT the MPPT units and then at the Battery itsself
I have the same mppt controller - fresh out of the box - with the GEL Spiral preset in a 24v bank - same issue - latest firmware versions. should be putting in around 28.8 but instead over 30v. Could be a bug - seeing a few comments regarding overcharging by the 75/15 mppt. I am running mine in the network - with a BMV-712 and temp sensor - but even changing the settings to the preset did not help.
If I read this, could it be best to use a battery protect on the charge side as well as on the load side? This is a small investment, but some things could go wrong, and batteries are expensive...
What kind of battery are you using? LifePO4 is usually 14,6V in bulk but Victron suggests 14,2V
