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I need to release my anger again. Today I further disassembled my problematic "100Ah" 48V battery from (today's Name) "PAPOOL LiFePO4 Official Store" (they keep changing names more often than I change my underwear). The battery had some problems from the beginning, i.e. one cell that is in a...

I am building a lifepo4 battery bank (16S 304Ah) and want to include a relay to be able to disconnect the battery even when the bms fails to. Now I have the choice between a 300A normal relay or what I would rather use due to the power needed to keep the relay closed is a bistable relay. The...

Hi, we have 6 shortly used 18W 12 to 24Vdc led tubes to sell, they were used in an offgrid installation for ~4 months. The tubes are 1200mm (120cm) T8 tubes from GEO-Technik (https://www.geo-technik.de/en/Lamps-Bulbs/LED-Lamps/LED-Tubes-T8/LED-Tube-T8-1200mm-4Ft-12V-24V-DC-18W-G13--2345.html) We...

Hi, I'm from germany in the area of Schleswig-Holstein and have 8 used Trina TSM185-DC01 modules to sell. We'd like to get something around 20€ per Module. The modules were used in an offgrid installation with mppt chargers and worked perfectly fine (for their age), some were used on my garage...

Hi, I have a chinese 100Ah 48V 19" Battery pack which has a cheap crappy seplos bms clone, horrible software and sadly one cell which is drifting away from the others. I am going to upgrade in may, so any ideas what to do with the chinese battery pack? Take it apart, throw a jk-bms with balancer...

Does someone has experience what happens if I connect two MPPT Trackers in parallel on a single string of PV modules? I have a single 250V string of panels and use my inverter (with mppt tracker) so it doesnt put any power in the grid, I want to use parts of the especially in summer overproduced...

Hi, lets say you have a gried-tie inverter with no EPS or Island Mode, and you connect a bunch of batterys to the input of the inverter and put something like the Victron Phoenix 48/250 VE.Direct 48V 230V 200W Inverter in parallel to the output of the grid tie inverter, would the grid tie...