hi all,
I am planning a ac coupled 3p storage as addition to installed ac-coupled solar panels.
purpose is to feed in the battery around noon, and discharge the battery in evening or morning, to protect the network from oversupply…
setup with one MultiPlus-II 48/3000/35-32 GX and two MultiPlus-II 48/3000/35-32.
Grid measuring with VM-3P75CT.
After reading throug some documentation I sketched it. Does the attached wiring diagram make sense? see here: https://benofs.de/index.php/s/GCCWjnTgKGxgWXc
And: is it possible to configure one of the AUX inputs, that the system switches to generate 3kw power if I give an input signal to it?
the diagram is missing DC fuses.
Convinient method is to use 2 Lynx Distributors. One for the batteries, one for the 3 MP2 and a MPPT later Use Adler EF 3 fuses for the batteries. They can clear higher currents.
I would not chain the Pylontech US5000, but connect each battery to one port of a Lynx.
The Amphenol plugs at the battery are not capble of handling constant ~180A (9000W @ 50V) You will not find matching 105qmm cables.
Use AC_in not AC_out_1 for a grid parallel system to charge and discharege batteries.
AC_out is for micro grids when the grid is off.
I would go for a Cerbo GX or RPi and not for a MP2 GX, as the verbo has more compute power you might wnat to use wiht DESS. A Cerbo should have relais #2, which might be able to be triggered from NodeRed. wiht nodeRed you can program nearly everything.
Consider Gobel Power GP-SR1-PC200 batteires with 15 kWh each. They are half the prices pe kWh compred to US5000 and have 16S instead of 15S. But be warned, they are 120 kg each.
Other 16s altrnative is pytes v5 wiht 5,1 kWh compared to 4,8 kWh at the saem price.
Last: a 3p system uses A LOT of cable. I just realised by cable are not fitting into the cable channels I bought. 3 MP2 , each with 3x cabels 3g10 is a lot…
hello Björn,
many thanks for the valuable feedback! Cerbo GX in deed seems more flexible and has more conectivity. The setup then is also more symetric.
I will follow the wiring hints, thanks very much. Lukily room for cables is not the limiting problem. May be the GP-SR1-PC200 is a nice alternative although the price differences seem to be not that much (~1200EUR per 5kWh). They are easier to store vertically at the wall…
Concerning the programming, it there a good place with examples? my search was not too sucessfull.
I have 4 x280 Ah (14,4 kWh) connected (58kWh).
BMS reports the stack with details e.g. lowest cell voltage 2:15 (pack 2, cell 15), average SOC, summarized CCL, DCL.
With newer firmware released this week CVL gets adjusted when SOC is 100%.
In comparison to Pylontech you can set all parameters. I ordered with heating pad (+20 EUR), although I do not plan to use them outside my heated basement.
Depending on you local situation order some lifting equipment or train a lot at the gym
Use Adler EF 3 fuses for the batteries. They can clear higher currents.
