My current system was installed with 2 x 48v, 8.2 Kw Givenergy batteries (paralleled) currently connected to a 3Kw Givenergy AC coupled inverter, via a Solis PV unit. My solar panels generate over 5Kw of power, so everything over 3Kw goes back to the grid.
I want to put one of the batteries onto a new Victron 3Kw/48v Easysolar-11 GX that I have just purchased.
However, the Givenergy battery does not have a Ve bus BMS connection (via RJ45) to connect the Easysolar GX.
The Givenergy AC coupled inverter monitors the battery via auxiliary + and -. I know a normal VE Bus BMS connection, monitors pin 4 canH & pin 5 canL, and uses pin 7 & 8 for 485A & B.
Is there a Victron interface unit that can be utilised to connect the Easysolar to the + and - on the Givenergy battery?
Other than voltage, no.
The inverter if there is no battery communication will use the voltage at its terminals to charge. So use battery cables to connect to the battery terminals together.
Or maybe consider a total replacement for SOC measurements such as the smart shunt or bmv.
Does the model you have have any kind of communication port?
A small correction here. Only the Victron batteries use a ve bus bms.
All other batteries that are officially use CAN connection to the GX directly.
Some clever guys have written drivers for other battery makes and can use rs485 to usb or can adaptors. (Drivers are available on github)
So it returns to the question…
Thanks for your reply.
No comms port, just the aux + & -, a usb port with a usb fitted and a 4 pin NC3 connector which looks like the ve direct connector on the Easysolar GX.
If I connect the battery supply terminals will it safely control the battery charge discharge?
Could I connect the aux + & - to pins 11 & 12 on the Easysolar GX, J connection block (they are for battery voltage sense)
If batteries are connected to Victron via the CAN port as you say, could I connect a CAN cable from the Victron (RJ45) CAN connector to the battery aux +&- using the correct polarity.
I know a type b, CAN cable only uses pins 4, 5 and 7 (ground) and outputs a small voltage on pin 4+ and pin 5-.
I have measured the voltage on the battery aux connection at 3.22vdc
Well at 3v thats not the battery voltage is it.
I think since there is no real explanation for its use on the internet or in its documentation it is best not to try use it
The inverters have a lithium profile and as long as you program the float and absorption voltage and time correctly you will be fine.
Have you contacted the supplier of the batteries for clarification?
All i can think is with a 4 pin connector you may be having ATC and ATD signals as a possibility. That could possibly use the 2 signal bms assistant. Again this is a total guess i know nothing about the battery in question or how it works.
Alot of batteries are charged ‘dumb’ and are fine. So unless the manufacturer has some very specific requirements like a keep alive signal you can use them like that.
Ok, many thanks, I’ll go ahead without and hopefully the Easysolar will sort it out
Best regards
I have now installed my Easy solar 2 GX, which is connected to an 8.2kw battery with no comms. It charged the battery ok but is not discharging to the home?
Fitted a smart shunt and battery percentage now displays ok - see thread.
Fitted a CT, but system cannot see the home load and so batteries just sit at 100% and do not supply?