I recently installed two new Hubble AM-2s about a week apart and now also have the battery monitoring hooked up courtesy of SolarAssistant. I'd be interested to compare the temperatures to others' setups, as well as the fact that the master always seems to lag the slave in terms of charging, yet also seems to discharge first.  Both eventually do reach 100% SOC though.  Battery leads hooked up as per their recommendation and as close to similar length as possible. Comms via CAN BUS [Sunsynk 5.5]. Batteries are installed in a "cool" environment [CPT].

Anyone out there that can share their battery view or comment on these readings? Thanks in advance.

5 minutes ago, shovelhead said:

I recently installed two new Hubble AM-2s about a week apart and now also have the battery monitoring hooked up courtesy of SolarAssistant. I'd be interested to compare the temperatures to others' setups, as well as the fact that the master always seems to lag the slave in terms of charging, yet also seems to discharge first.  Both eventually do reach 100% SOC though.  Battery leads hooked up as per their recommendation and as close to similar length as possible. Comms via CAN BUS [Sunsynk 5.5]. Batteries are installed in a "cool" environment [CPT].

Anyone out there that can share their battery view or comment on these readings? Thanks in advance.

I have 3 x 5.5kWh LFP batteries installed in a server rack (not Hubble), the temperatures reported by the BMS of each battery is almost always different, sometimes by as much as 5 degrees Celsius on the ENV reading. Cell temperatures are often very close.

These are installed in a flat roof (galvanized iron) garage, meaning it gets really hot in summer (lows in Winter is about 15 degrees Celsius and highs in summer about 42 degrees Celsius, cell temperatures will however around 32 degrees Celsius when the EVN temp is 42 degrees Celsius)

If as you say all cables are correctly sized, similar distances, all lugs are correctly crimped and correctly tightened (including the fuse box and battery disconnects) and you are still seeing different discharge rates then it is likely caused by the battery cells themselves which is causing the internal resistance in the two batteries to be different.

The one with the lower internal resistance will discharge at a higher rate and it will charge at a higer rate. There is not really anything you can do about this.

P.S. you might want to check your AM2 wattenty document, last time I read this it contained a clause stating that connecting 3rd party devices (which presumably includes solar assistant) to the RS458 or RS232 will void your wattenty.

Your battery temperatures are quite normal.

 

50 minutes ago, I84RiS said:

P.S. you might want to check your AM2 wattenty document, last time I read this it contained a clause stating that connecting 3rd party devices (which presumably includes solar assistant) to the RS458 or RS232 will void your wattenty.

It is a read only app and there is no way for Hubble to know that one is reading the data and if you don't tell them they will be none the wiser. The reason for them stating that is devious as far as I am concerned. Why would they want to withhold vital battery data from the user except if they have something to hide? 

3 hours ago, shovelhead said:

I recently installed two new Hubble AM-2s about a week apart and now also have the battery monitoring hooked up courtesy of SolarAssistant. I'd be interested to compare the temperatures to others' setups, as well as the fact that the master always seems to lag the slave in terms of charging, yet also seems to discharge first.  Both eventually do reach 100% SOC though.  Battery leads hooked up as per their recommendation and as close to similar length as possible. Comms via CAN BUS [Sunsynk 5.5]. Batteries are installed in a "cool" environment [CPT].

Anyone out there that can share their battery view or comment on these readings? Thanks in advance.

Also now wondering about that small power discharge on Pack 1 as opposed to the Pack 2? I probably wouldn't have been any the wiser if I didn't hook this cable up - any views from the battery experts out there?  

4 hours ago, shovelhead said:

Also now wondering about that small power discharge on Pack 1 as opposed to the Pack 2? I probably wouldn't have been any the wiser if I didn't hook this cable up - any views from the battery experts out there?  

What was the system /inverter doing when these stats were taken. Batteries seems to be in rest state even though they are not at full SOC. Interesting that the SOH is not shown in the stats.

 

 

The batteries were in a "charge from solar "cycle, but not enough PV power at the time to charge the batteries, so they were essential idle.

15 minutes ago, I84RiS said:

Interesting that the SOH is not shown in the stats.

The Hubble cloudlink did provide that in the beginning. From what users are reporting Hubble removed that view too.
With SA there is no SOH stat, what SA does it states the Battery capacity and then also the Charge capacity. The charge capacity should equal the battery capacity when the battery is at 100% SOC. This should give you the SOH.
Whether the real capacity is reflected in the displayed charge capacity only time will tell. My battery is approaching 600cycles and it still reflects full capacity. But what I do as well is to check the kWh used over night, then I check the percentage shown and use the used percentage to calculate the kWh. I also crosscheck that with the kWh needed to recharge the battery to full.
This then gives me a fair indication of what the battery capacity is, and up to now it has been in the 110Ah ballpark. 

39 minutes ago, zsde said:

The charge capacity should equal the battery capacity when the battery is at 100% SOC. This should give you the SOH.

On my SunSynk SOH is given on the LiBMS display under settings.

My 3x Hubble-AM2's often charge and discharge at different current and power rates, but look at the Voltage, which will be very similar, if not the same most of the time.