Changing lay-out, blowing up REC, excellent after service of Tine.
Over the last month I decided to change the lay-out of my ESS.
The Rittal cabinet, with battery bank + SI,
is close to a staircase in my workshop, accessible from 3 sides.
I made the mistake to have all bms wires from the batteries on the best accessible side,
and the AC+ comm connections to and from SI on the less accessible side.
So I changed it,
with help of my strong neighbor we lifted the SI again, and swapped it across. to the other wall of the Rittal cabinet
I rewired the AC220 1phase "unterverteiler,
fitted 90mm2 DC wiring (was 50mm2) even on a short length of less than 75cm 50mm2 got warm.
Changed the Omron contactor with a 5mm double contact copper bushbar to use 2 of the 3 poles in parallel.
The third pole will be used (in planning) to control the auxillary Siemens Telco charger.
Put back all cables to REC, and flipped the switch, nothing, one beep and dead.....
Switched it to off
Took out the lasttrenner,
and started checking,
OK I goofed,
I swapped the temp and shunt connectors.
This definitely kills the BMS.
Courtesy of REC,
They refurbed the BMS @20% reduction of cost of new.
see burned pcb
Attached some photo's of the ESS build with
240 Yuasa cells from Mitsubishi Outlander PHEV second-life batteries
16P 15S 56.25V nominal 640Ah,
stacked in aluminium railing (epoxy glued)
SMA SI 8.0 single phase
REC Q16S BMS, cooling via Aluminium plate 10mm thichness sized 56.5 x75cm
Meanwell dc-dc converter 48-96V >>12V
REC pre-charge unit 12V
Omron contactor 12V 3-pole, 100A per pole, 2 poles parallel with 5mm copperbushbar
parallel 50mm2 wiring from bat bank to 100A breaker switch
90mm2 wiring from breaker switch to SI (negative via 300Amp shunt, positive via Omron contactor)
I've used a Lenovo Twist laptop to control the BMS, and with Teamviewer I have remote control via the internet
AC connection to the mains/grid via a "Baustrom unterverteiler", 20A breaker (quick) + FI 0.30 ma
7.5m1 cable 3-phase 6mm2 32A, to work shop breaker board, 20A breaker (quick)
From work shop to our house 5x10mm2 to main breaker board, 30m1, 20A slow breaker/switch
SMA energymeter v1 + Sunny Home manager v1. signed up to Sunny portal.