All Questions
27
questions
0
votes
1
answer
57
views
Grounding PV solar, battery and load
I have simple diy solution for solar system. The system is build using esp32, 2x ina266, ads1115 and acs758. The esp is powered from usb 5v (stepdown from battery) and 3v3 is then distributed into all ...
1
vote
1
answer
75
views
How much current can I pull out of a battery
So I know an average PP3 9-volt battery has about 500mAh of capacity. If I wanted to, for example, draw 3.5 amps, the battery would last about 8 or 9 minutes, though that would be assuming the battery ...
- 173
0
votes
1
answer
48
views
Estimating lithium-ion battery run time at different voltages
A polymer lithium battery in a powerbank (marketed as 30,000 mAh / 3.8 V, 114 Wh), has an actual electric capacity of 19,944 mAh, and an energy capacity of 104 Wh as measured with a constant load ...
- 103
4
votes
3
answers
2k
views
If batteries are arranged in series in a closed circuit (I.e. with a load, which is constant) why doesn’t the current increase when voltage does?
I guess people have asked slightly similar questions to mine before, but I still haven’t been able to find a complete answer as to WHY the current doesn’t increase even when the voltage in a circuit ...
3
votes
1
answer
365
views
Is "load sharing" when 2 power supplies are connected in parallel or when a battery is connected indirectly to the load?
I see the term "load sharing" used in two completely different cases:
When 2 power supplies are connected in parallel, a technology that ensures that each delivers half of the load current: ...
- 22.8k
1
vote
2
answers
109
views
Charging IC problem: charging restarts every 12 hours without load on battery
I'm using the MCP73837 charger IC.
After charging is finished the IC goes into charging mode again every 12 hours for 6 hours, even though the battery is connected all that time with no load.
...
user220456
0
votes
0
answers
304
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How to calculate portable power station draining with other loads?
I want to buy a portable power station, it's basically a battery, the battery capacity at 14.8V/15Ah is 222Wh, I want to know how many times it will long for some loads, such as a simple light , or ...
- 1
4
votes
2
answers
5k
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SLA battery under load: Is the absolute voltage or the state of charge primary for wear avoidance?
When an SLA battery is under load, they say not to go below a certain value to avoid wear. So, don't go under 30% State of Charge (SoC), which is also a certain Open Circuit Voltage (Voc), say 11.8V . ...
- 125
0
votes
3
answers
207
views
Is there a way to somehow "isolate" a voltage drop?
I have a small issue with voltage drop. I'm working on a project, where I have five resistive wires (approx. 8 ohms each) connected to li-ion battery pack in parallel. The battery pack outputs 16.8V ...
- 29
1
vote
0
answers
151
views
Solution to prevent load from drawing the current from battery while it is charging and draw it from charger instead
I have the following problem: I have a 12.8V LiFePO4 Battery that powers the circuit and a lead acid charger with Intelligent MCU Control of 12V and 1.5 A to charge the battery.
When the battery is ...
- 5
1
vote
2
answers
420
views
Is a VL3030 coin cell battery a suitable replacement for a ML2430?
I am attempting to replace a battery in my electronic compass and im supposed to use an ML2430, however this is proving to be hard to get hold of and expensive.
I'm concidering using a VL 3032/HF5N ...
1
vote
2
answers
538
views
Measuring the capacity of a 40v lithium ion, lawnmower battery
I purchased a 40v Greenworks lawnmower battery, and it's listed capacity (6,000 mah) doesn't seem to be accurate based on what I'd expect to get out of it when mowing a lawn.
How would you go about ...
- 111
1
vote
2
answers
940
views
How are series connected batteries of different voltages (or even same voltages) charged "equally"?
I am trying to understand conceptually, how a series bank of batteries is charged "uniformly". Let's take the example of of six 6V AGM batteries for a 36V golf cart. The charger is 36V nominal but ...
- 258
0
votes
1
answer
49
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How can I roughly estimate the load in this case?
A DC device operates with three industrial AA batteries meaning 1.5V times three = 4.5V. Besides that I only know that the approximate operating time is is 4 hours.
Is that possible to estimate the ...
- 4,333
1
vote
2
answers
2k
views
Can a 12V AGM battery be damaged by too light a load and relying exclusively on a 10.5V low voltage cutoff?
A problem I have with 12V power inverters is that they are set to give a warning beep and/or shutoff at about 10.5V (1.75V per AGM cell). This is supposed to protect the battery from overdischarging, ...
- 258