March 20, 20224 yr Good morning I am about to add a 3rd Pylontech us3000c to my fairly new installation. What I need to do is: Replace the installed 2U cabinet with a 4U cabinet and then add the 3rd battery I am doing this on a Synsynk 8.8KW Inverter. Any advice? Do I need to first balance the batteries by connecting them together without connecting them to the Inverter and wait for all the lights to stabilize? What do I need to do in the inverter? Is there changes I need to make in the control panel? Sorry if this sounds dumb, but I am very new at this. Regards Aubrey Edited March 20, 20224 yr by cyber7
March 20, 20224 yr 14 hours ago, cyber7 said: Replace the installed 2U cabinet with a 4U cabinet Unless you need to lock your battery cabinet, don't buy any of the ones from solar shops - they are way too expensive. Google for Samson SRK12 (for 4x Pylon) or SRK16 (for 5x) at much lower cost. And buy at least one size bigger than you need at the moment (as you probably will add more Pylons in the future) 14 hours ago, cyber7 said: Do I need to first balance the batteries by connecting them together without connecting them to the Inverter and wait for all the lights to stabilize? Yes, recommendable to get the batteries to a similar voltage. Do not be put off if the SOC shows different between the old ones and the new one for the first week or so 14 hours ago, cyber7 said: What do I need to do in the inverter? Is there changes I need to make in the control panel? You need to adjust the battery capacity on the Battery screen (from 144Ah to 222Ah) Everything else (e.g., max charge current) the inverter will pick up from the Pylon BMS
March 21, 20224 yr 7 hours ago, wolfandy said: Do I need to first balance the batteries by connecting them together without connecting them to the Inverter and wait for all the lights to stabilize? When I added new batteries to the mix, I charged the old batteries to 100% and then disconnected them and charged the new battery to 100%. Then I connected the batteries (still disconnected from the inverter/charger) and let them balance for a day. Then I connected them all up to the inverter...It still takes a few days for them to settle down after that.
March 21, 20224 yr Author 11 hours ago, wolfandy said: Unless you need to lock your battery cabinet, don't buy any of the ones from solar shops - they are way too expensive. Google for Samson SRK12 (for 4x Pylon) or SRK16 (for 5x) at much lower cost. And buy at least one size bigger than you need at the moment (as you probably will add more Pylons in the future) Yes, recommendable to get the batteries to a similar voltage. Do not be put off if the SOC shows different between the old ones and the new one for the first week or so You need to adjust the battery capacity on the Battery screen (from 144Ah to 222Ah) Everything else (e.g., max charge current) the inverter will pick up from the Pylon BMS Thank you for the reply. Unfortunately I do have to lock this away, as I have 3 (orrelpypies) boys that thinks everything they can get access to is "open domain"! I did, however got one in JHG for WAY less (more than a 3rd) than quoted anywhere else... Then, my current capacity is set to 148Ah, why the 4Ah difference? Need I worry about it? cheers Aubrey
March 21, 20224 yr 4 hours ago, cyber7 said: Then, my current capacity is set to 148Ah, why the 4Ah difference? Need I worry about it? Your setting is correct - my math last night was just off 😜
March 22, 20224 yr Author Thank you @wolfandy One more question. Do I switch "priority load" on or off?
March 22, 20224 yr 28 minutes ago, cyber7 said: Do I switch "priority load" on or off? I have this on. If I remember correctly, it then first takes PV for loads and only pushed any excess PV into the battery. If off, it will prioritize charging the batteries - which means you end up using more grid
March 22, 20224 yr Author Thank you @wolfandy One more question. Do I switch "priority load" on or off? 2 hours ago, wolfandy said: I have this on. If I remember correctly, it then first takes PV for loads and only pushed any excess PV into the battery. If off, it will prioritize charging the batteries - which means you end up using more grid I see you can set the charge/discharge amps. It is currently set to 74A, is this correct?
March 22, 20224 yr 41 minutes ago, cyber7 said: It is currently set to 74A, is this correct? Pylontech sets 37A for recommended charge/discharge current per battery. So for your current 2 Pylons, this is correct. When you have added your 3rd, you can set this up to 111A. But if I am not mistaken, this value is actually also taken from the BMS - and the Pylon dynamically adjusts this number based on where in the charging cycle the battery is
March 22, 20224 yr Author I found it, you are quite correct, the 111A is the correct value - Thank you @wolfandy
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