Adding a Smartsolar 250/60 to a MP II-GX 5k and Pylontech setup

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sharpener asked Oct 13, '22

Adding a Smartsolar 250/60 to a MP II-GX 5k and Pylontech setup

The existing system is running ESS with PV inverter on AC-Out 1. I plan to add more panels and a Smartsolar 250/60. Its manual says

There are two exceptions to normal operation:
• When used in an ESS system; the solar charger algorithm is disabled; and instead it follows the curve as mandated by the inverter/charger.
• For CAN-bus Lithium batteries, like BYD, the battery tells the system, including the solar charger, what charge voltage to use.

What else do I have to do (i) to achieve normal operation with control from the ESS using a VE.Direct connection to the MP II-GX? Can the setup all be done over this link, as there is no smart phone available? None of the standard settings appear to be suitable for a Pylontech Force-L2 as they only have 15 cells

(ii) to protect the battery in the event of malfunctions of the charge controller or the BMS?

Multiplus-II

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Answer 1 · 2022-10-14T06:29:01Z

Alexandra answered · Oct 14, 2022 at 06:29 AM

@sharpener

You need an mk3 to usb adaptor to program the inverter with a laptop and ve config (for ess) or victron connect (for the basics)

The mppt can also be programmed with connect and a latptop and a ve direct to usb adaptor. Although it is hard to imagine a person without a smart phone or laptop these days

You can program the mppt over the vrm and victron connect if ve direct connected.

If there is a loss of comms from the bms the #67 bms lost state will appear in the system and the system will stop charging.

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Answer 2 · 2022-10-14T07:36:35Z

sharpener answered · Oct 14, 2022 at 07:36 AM

Thanks @Alexandra.

Yes I do have a laptop and this is how I have been programming the inverter up to now, and I have a VE..direct cable on order so that is the way to go.

Good to know BMS failure will shut it down.

But what settings do I need to put in the mppt for my Pylontech batteries, or is it all automatically configured by the ESS and/or BMS anyway so I can leave it on the defaults?

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ejrossouw commented · Oct 14, 2022 at 11:10 AM

The same charge parameters, which was used for setting up the Multiplus-II, should be set on the MPPT (52V Abs and 51V Float) as well it should be set to LifePO4. Easily done via VictronConnect. If the Cerbo connection with the MPPT is lost or fails, then the MPPT will do its own thing and this is why it is important to do this.

Selecting the Testbench installation above will show the configurable devices as below e.g. Smartsolar

When you then select e.g. the Smartsolar, you can change some of the settings as shown below.

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Alexandra ♦ commented · Oct 14, 2022 at 10:46 AM

@sharpener

Everything you need to know is in this manual.

https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom

But in short absorption is 52v

Float is 51v

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Answer 3 · 2022-10-15T16:57:58Z

sharpener answered · Oct 15, 2022 at 04:57 PM

Thank you both. Not entirely straightforward, it would help if there were a Pylontec pre-set but I have now created one for myself.

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