I have a BlueSolar 150|60 charging into a 26.5 Volt 400Amp/Hr LiFePO4 (Winston 8 cells) battery system.
I also have a Victron SmartShunt, 500Amp.
The cable from solar charge controller is 35mm2 and less than 600mm on the positive and 300mm on the zero volt lines. The positive line passes through a 60Amp fuse for the solar and then a BlueSeas 350Amp isolation switch then a final 100 Amp main battery fuse.
When charging, say at 30 to 40 Amps from the charge controller, I notice a voltage drop between the terminals of the charge controller and battery terminals, as to be expected, of around 150mV just on the positive line, and around 20-30mV on the zero volt line.
I understand the electron flow, no problem about this part, but, knowing other devices such as the SmartSolar with Bluethooth and that it is able to communicate to the SmartShunt to get battery sense, my question is, how then might it be possible to have a BlueSolar charge controller get external battery sense ?
And without using a Colour Control with DVCC, which I do not have.
My thinking is that it would have been a sensible idea for Victron to have a connection into the BlueSolar charge controller to allow a simple wire connection back to the battery terminals to have accurate information.
I can see that there would be many people who would have simple systems and then come across this issue, or maybe without knowing it, possibly leading to an under charged battery.
To get around the situation for the time being, I need to increase the charge voltage set point by the amount that is dropped, which in my opinion is not so ideal.
I use a VE.Direct cable to a dedicated laptop running GNU/Linux with the VictronConnect appimage, as well as being able to connect via Bluetooth to the SmartShunt, which all works very nicely.
What approaches or solutions have others found ?
I appreciate any answers.
