Please see the ESS system we have in place in the Netherlands for little more then a year now.
Victron:
3 x MP 48/5000
1 x MPPT RS 450
1 x Cerbo
1 x GX touch
2 x Lynx Distributor
2 x EM 24
Solar:
16 panels (195Wp) 3120Wp on DC side (Panels are some 14 in years in use already)
13 panels (405Wp) 5265Wp on AC Grid side (Not on critical load)
Battery:
5 x Delong Shenzhen LFP 51200 10kWh each (total 50 kWh) with own BMS.
Miscl.
3 x 25 A home grid connection
1 phase charging station for EV. ( Have to be a little carefull here as charging canât be on max 16 A when DESS is buying same time)
Run it on VRM Portal and am â playingâ with Node-Red a little.
Temperature and smoke detection from Somfy home application.
Very happy with the system and use it with dynamic contract. 80% of the time DESS is on trade mode and rest on Green.
Am considering to buy additional 5 PCs directly at Delong Factory, same as initial set. (Could become an issue to charge/discharge some 80 kWh (considering soc 20% minimum) in a given time based upon energy prices, however for me buying/selling with low/high kWh prices is not the most important.)
We are building exactly the same. Are you using Pylon Protocol?
We have the issue that the system is charging the batteries at night when SOC <47%⌠just wondering if Pylon Protocol is working for you flawlessly (choosing victron protocol is not working at all)
thx,
Walter
Hello Walter, thanks and here it works ver well.
Batteries are 16s and have the Pylontech protocol.
In the cerbo gx I can see BMS pylontech.
I use the B ve can to can bus cable to connect from battery to cerbo gx.
I do not notice strange or unwanted charge /discharge and it follows the DESS with dynamic contract very well. Soc values in the cerbo is the sum of the 5 batteries divided by 5. Therefore I connected the batteries with same length cables directly on the bus bar. Soc difference between the batteries are almost nothing.
The Pylontechs are 15s, and victron is limiting the Max Charge voltage to 52.4V, because for a 15s that is sufficent with 3.5V.
Yours however are 16s, but identify as pylontech.
If the same limit is applied as well - because the system detects them as pylons - that would come down to 3.275V, which may be a problem for balancing, as balancing usually starts at 3.45V (iirc) - so your batteries may not reach their cellbalancing voltages.
@iburger is doing a lot around the pylontechs, maybe he can tell if that may be a potential issue, or if the system has possibilities to identify âfalse pylontechsâ and apply the required charge voltage?
Hi @WB2
Very interesting layout as battery is concerned.
From where did you get / purchase them?
Was there any problems at transport? Or at the customs?
Thank you!
This hasnât been the case for some time now.
Pylon have 16 cell packs now as well.
The GX will detect which it is and adjust accordingly, which solved the cvl problem for batteries spoofing pylon.
Weâre going off on a tangent here on this thread.
There isnât a pylon âprotocolâ.
Victron publish a spec (if you ask for it) that manufacturers have to test and adhere to. Those that donât do this, just announce the pack as a pylon so the battery inherits the relevant properties and is recognised by the GX. It still sends its own CVL.
DVCC checks if the CVL requested is that of a 15cell battery and then clamps it to 52.4V if it is. If the CVL is higher then it just honours that instead without additional limitations.
Hi @alexpescaru, thanks and batteries are individual connected to the DC bus bar with all same cable lenght. So no looping between the battteries.
Batteries are directly purchased from Delong Shenzen (Delongtop) battery. Susan is sales manager and intitiated through Alibaba. Had some technical issues/questions and this was through Wechat with translation fucntion. Very easy.
Important is to agree on delivery DDP. No issues with custom or delivery at all. You get track and trace in Chinese. All in all very satisfied here.
Haha, that is interesting indeed. I did sent a picture some time ago and didnât know they used it. It wasnât finished yet on that picture and the batteries were all parallel connected to the top one. I changed this, as mentioned before and batteries are now connected individual to the bus bar.
They just made mistake on the country. It is 100% netherlands.
I paid 160 USD/kW and shipment was 2000USD ddp netherlands. It was around 400/450Kilo. I think kW prices are little lower now however not completely sure as CATL closed a lithium mine recentl and this can cause price fluctuation globally.
Good luck
No worries, we know there are 16s models out there and we recognise that and do the right thing. The various work I did for 15-cell batteries have no effect here.
True, but there are some things that cause non-Pylontech batteries to be incorrectly identified as Pylontech, which causes this perception.
To get technical: There are two ways to communicate warnings and alarms. You can use the message with id 0x35A, as you should, and then everything works fine. Or, you can use message 0x359, which also works, but that is not the one we want you to use. Furthermore, we want you to use 0x35E to announce the manufacturer name. If we recognise that name, then there is no problem.
Here is how it goes wrong: Someone makes a battery that behaves like a very old Pylontech (the newer ones all do the right thing by now): They send alarms and warnings on 0x359, and they donât have the message 0x35E. Then, they also have the characters âPNâ embedded in message 0x359, which is how we detect really old pylontech batteries. If a battery does this, down to the PN marker (as so many batteries from China does), we will misidentify it as a Pylontech battery. This is not a bug and will not be fixed. Doing that will break support for those old batteries.
I hope that helps to understand the pitfalls, even if a tad off-topic here.
