How many batteries of 12 V x 125 Ah needed to continuously run a load of 1600 Watts using an inverter of 24 VDC x 120 VAC that uses a battery bank as primary source?
For a load of 1600 W , at least an inverter size of 2400 W is needed. The existing inverter output is 3000 W, it will be able to run the load at near 55%. The question is to arrange a battery bank system so that the load can be run without depleting the batteries with a runtime of at least 10 hr.
The batteries of 12 V x 125 Ah need to be in parallel and in series in order to provide the 24 DC source to the inverter. There are currently some 12 V x 125 Ah and more may be needed. We need a way to compute how many more batteries of 12 V x 125 Ah to arrange in order to satisfy the inverter input of 24 DC and the minimal runtime of 10 hr for the loads.
After some computations, I found that the minimal needed for the load for 10 hr will be around 1300 Ah that will give about 10 batteries of 12 V x 125 Ah
- What needs to be taking care is the remaining 14 hr runtime, an extra load of 1600 W that may be needed later on and how the batteries will be charged. Based on the specs , it’s an inverter/charger that can be auto switch. To avoid discharge of the batteries the inverter can be set to autocharge the batteries from a generator or solar panels for the remaining 14 hrs
If in need to add another load of 1600 W, since the first one works at 55% adding extra batteries in the bank may help in order to avoid overload of the inverter. This part of the problem is to find out how many batteries can be added to the system without risk.
The inverter Specs
• Continuous Output Power: 3000 Watts • Surge Rating: 9000 Watts (20 Seconds) • Output Waveform: Pure Sine/Same as input (Bypass Mode) • Nominal Efficiency: >88% (Peak)
• Nominal Input Voltage: 24.0 VDC • Minimum Start Voltage: 20.0 VDC • Low Battery Alarm: 21.0 Vdc-22.0 VDC
• Nominal Voltage : 12 V • 20 Hr Capacity : 125 Ah • Charging Current : 8A-35 A • Charging Voltage : 14.4-14.9 V • Float Voltage : 13.5V-13.8 V
Bitcoin miner load specifications
• Hash Rate: 11.5 TH/s. ... • Power Consumption: 1450 W +7% at the wall, with Bitmain's APW3 PSU, 93% efficiency) • Power Efficiency: 0.126 J/GH + 7% at the wall, with Bitmain's APW3 PSU, 93% efficiency) • Rated Voltage: 11.60 ~ 13.00 V.