July 2, 20232 yr Hi, I have eventually taken the plunge and gone for some solar stuff 🤓 Eventually the system is to power a mission-critical load, an FM Broadcast Transmitter 16.5 hours a day. I did search for what I am looking for but did not find any satisfactory answers. I am looking to get the most out of the battery(s). I have... 12 x JA Solar 460W panels. 1 x Master Power Omega X-Rack 5kW 48V MPPT Inverter - Zero transfer time. (As far as I can see it's the same as Voltronic Axpert King 5K Rack) 1 x Pylontech 48V 3.5 kWh US3000C. At the moment I have the system on a bench test in the workshop. With just 4 panels connected and a 1000W resistive load available. Pylontech Specs say... Nominal Capacity (Wh) = 3552 = 100!% Usable Capacity (Wh) = 3374 = 95% Omega X-Rack Specs say... Battery Mode Peak Efficiency = 90% Therefore 90% of 3374 (Pylontech Usable Capacity) = 3036Wh *NOTE* Setting #12 = Battery voltage point back to utility. On test from fully charged I have tried... #12 @ 48V it did 2.35hrs -or- 2:21 = 2350Wh #12 @ 47V it did 3.12hrs -or- 3:07 = 3120Wh As you can see 2350 is well under 3036 and 3120 is a little bit over 3036. Question > Will I be OK at #12 @ 47V ? BTW: Note the little kick starter on top of the inverter 😎
July 3, 20232 yr Hi RBrain. My settings as follows. The lowste I have seen on Solar Assistant was 46.5V under a +-2Kw load and according to the battery it had 9% State of charge left.
July 3, 20232 yr Author 14 minutes ago, Jacques Ester said: Hi RBrain. My settings as follows. The lowste I have seen on Solar Assistant was 46.5V under a +-2Kw load and according to the battery it had 9% State of charge left. Jacques Ester Thanks for the info 👍 9% left at #12 @ 47V sounds about right then 😎
July 4, 20232 yr Author Some more real numbers workouts reveal this Pylontech Specs ... Nominal Capacity (Wh) = 3552 = 100!% Usable Capacity (Wh) = 3374 = 95% Omega X-Rack Specs ... Battery Mode Peak Efficiency = 90% Setting #12 = Battery voltage point back to utility Tests with 1000W load from fully charged... #12 @ 48V it did 2.35hrs -or- 2:21 or 2350W @ 90% power taken from battery = 2610W = 73.5% of Battery Capacity BTW: with #12 @ 47V at +/- 47.5V the inverter flashes Warning #4 = Low Battery #12 @ 47V it did 3.12hrs -or- 3:07 = 3120W @ 90% power taken from battery = 3466W = 97.6% of Battery Capacity Am I going to kill the battery @ 47V ?
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