RoannG

I ended up replacing my inverter and battery. Could not get the bulk charge issue resolved. All good now with the new setup.

Can anyone give advise on how to sonnect the pylontech UP2500 to Must pv1800 VPM inverter? I use the USB port on my inverter to connect to Raspberry Pi, to use Solar Assistant. What cable and ports do i use to connect the Pylontech to the MUST for BMS communication? What type COMS cable do i use?

Hi, I currently have a Synapse V3.0+, 24V inverter installed and want to replace my 2x S100 Hubble batteries, (only internal BMS). I can get my hands on a Pylontech UP2500 battery, but was wondering how the BMS interface would work with the inverter? What battery type setting do i select on the Synapse inverter? Do i set to USE and then the battery BMS controls te rest, charge voltage ranges, etc? Further to this, i also have a spare MUST pv1800 vpm inverter available and can replace the Synapse? Will this be a better solution to communicate with the Pylontech BMS? My current Synapse inverter is connected to a Raspberry Pi via CAN - USB for monitoring via SolarAssistant. This communication protocol is also not great as it requires continues rebooting of the system to re-establish the connection. Your thoughts or ideas would be appreciated.

Yes, DC charge current. I have battery balancer with live viewing connected to the batteries at all times, so the voltages are correct eliminating bad terminations. Also confirmed with a multimeter. I can set the float and bulk to 28.8V, i doubt that this will change the charge current. My guess is the different charge cycle times need to be changed somehow... Agreed, i did not expect much, but was atleast hoping to achieve the advertised charged currents...

Have you confirmed this with a clamp meter? Mine has a max grid charge current of 25Amps only, although it never reaches that. Only 7.2-7.3 Amps...

@Scorp007, very interesting indeed. It can only be a charger issue then? My 2x S-100's charged at >40Amps and bulk voltage on previous inverter. Only now on the synapse that it is a issue. Had good solar available today and also did not manage to go over 7.2Amps, 28V.

Thanks, i agree the PV is too small. This is what i had and plan to expand a bit in the future. It caters for my needs at the moment. Yes, seems the charging is not as expected on the inverter.

0Amps at 28V.

Installed System: Synapse V3.0+ (3000VA/2400W), 24V inverter with 2x Hubble S-100 batteries in series. Further to this a HA11 battery equalizer is installed. PV: 2x 180W panels. I use Solar Assistance to monitor the inverter, PV and batteries. Also confirmed the voltages with a multi-meter. Battery charge settings are: Charge: Utility and Solar simultaneously Source: Utility as priority Battery float charge voltage 28.0 V Battery absorption charge voltage 28.8 V Firmware: U1 09 56 U2 03 39 It seems the inverter charger never reaches the bulk charge voltage of 28.8V and never exceeds 7.2Amps. I have drained both batteries and connected them in parallell for a hour before connecting back to series and recharging. A/C charge set to 25Amp with max charge to 60Amp. I have tried to charge on solar & utility, utility only and solar only but cannot get the inverter to do a bulk charge. After the charge has been completed, the batteries are at 28V, 100% SOC. This is correct as per the hubble's recommended charge settings. I have searched for inverter firmware updates, but no luck. Any ideas what the problem could be, why i am not achieving a bulk charge?