Connecting multiple battery banks in series and then in parallel in the following manner will create 2 floating battery packs and our systems will only be able to monitor the top connected battery pack.
In order to monitor multiple series connected battery banks in parallel the following diagram can be studied. in this configuration the batteries is first connected in parallel and then in series, the batteries can now share current with each other like any other 2 batteries in parallel would do. The batteries in parallel become one large battery of double the capacity and our system can monitor the complete battery bank in this configuration.
In order to double up on Amp hour capacity 2 or more batteries will be connected in parallel.
To create a “Balanced” parallel connection the wires connecting to the battery pack should be connected to the first and last battery in the parallel pack.
As per top drawing battery A will work the hardest in charging and in discharging mode due to small resistances from the connecting cables between battery A,B and C and will most likely fail(deteriorate) first. Battery B will also work harder than battery C.
In the bottom drawing Battery A,B and C will equally charge and discharge as all 3 batteries now share the same resistance path caused by the connecting cables between battery A.B and C.
Gigabit MODE B POE -usually for low power POE devices up to 25W. Data over all 4 pairs of the cable and power over 2 pairs. Normally pin 4 and 5 will carry + power and data and pin 7 and 8 will be negative power and data.
Gigabit PHANTOM POE -for high power POE devices > 25W. Data over all 4 pairs of the cable and power over all 4 pairs. Normally pin 1 and 2 and 4 and 5 will carry + power and data and pin 3 and 6 and 7 and 8 will be negative power and data.
Phantom POE devices complying to the IEEE standards have diode bridges inside the device for auto input power polarity correction -meaning even a Phantom POE with output polarities on pins of the cable that does not match with the radios polarity will still power the radio correctly.
The Mi-Passive Phantom POE injector outputs the following on the RJ45 / + on 1,2 and 4,5 and – on 3,6 and 7,8 – this is the correct polarity for eg. Ubiquiti Air fibre radios but completely reversed for a CIA 17Ghz radio however both radios will work on the Phantom POE due to Phantom powered radios having auto polarity correction diode bridges.
Difference between negative and positive controlled solar regulators
Problem arising from using a NEGATIVE controlled regulator:
When the mains charger is active and the negative controlling solar regulator is active during day time , the battery will see the negative from the mains charger as negative and the batteries will be exposed to the solar panels +VDC output , for instance, if the solar panels feeding the MPPT regulator produce 80Vdc in daytime, with the mains charger being active the batteries will see +80VDC at the positive terminals causing the batteries to overcharge.
Be sure to use a positive controlled solar regulator if used in parallel with a mains charger.