Solar Battery Voltage Drop Under Load

Solar Battery Voltage Drop Under Load. When you go solar, one of the goals is to minimize voltage drop so that your system performs at peak efficiency. This concept, known as voltage drop, leads to a slight production loss from your solar array.

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Voltage drop in a single panel system. For the load side i use the load output of the smartsolar 75/15 as im only running small loads (mostly <5a). The system voltage drop you see at night when the sun goes down is the charge controller moving into a resting mode with no energy to contribute to the system.

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(picture below is with load and without load). Range between 80% to 100% yields above rated output voltage, but the voltage drops quickly.

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Let's calculate the amount you will lose: This leads to the situation that especially during absorption the battery output is below the desired voltage.

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1) with the voltmeter connected to battery, and key and engine off, record a base voltage reading. It is perfectly normal/acceptable for the battery voltage to sag by 0.5 to 0.7 v under heavy load.

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Such as you measure the battery side of the fuse and it is 12.4 volts, the pump side is zero, all the voltage is dropping across the fuse so its either bad wire connections to the fuse, or the fuse it self is bad but not blown. When you go solar, one of the goals is to minimize voltage drop so that your system performs at peak efficiency.

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The system voltage drop you see at night when the sun goes down is the charge controller moving into a resting mode with no energy to contribute to the system. Under no load the battery voltage reads 13.09v, but once i start pulling 10 watts the voltage drops to 12.4v and keeps dropping after a few minutes.

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To eliminate these external factors, turn off all loads and disconnect the solar array to allow the battery voltage to stabilize. After that point, you should you need to be able to check the voltage with a known load applied, and after an hour, recheck the voltage.

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Some say it can be reversed, but dont count on it as that is not proven technology. This works find but what does not work find knowing what i know now, is that the battery bank never reaches not even 70% soc before it reaches 26v again while solar charging.

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This totals 32 millivolts, a tiny part of my one volt drop. But, when i use the inverter to charge my laptop, it drops down to 10.8 and the invert essentially stops.

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Under no load the battery voltage reads 13.09v, but once i start pulling 10 watts the voltage drops to 12.4v and keeps dropping after a few minutes. This works find but what does not work find knowing what i know now, is that the battery bank never reaches not even 70% soc before it reaches 26v again while solar charging.

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It is perfectly normal/acceptable for the battery voltage to sag by 0.5 to 0.7 v under heavy load. If i plug an 400 watt inverter into it, it will read the proper battery voltage.

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Voltage drop in a single panel system. Most of the drop is within the batteries themselves.

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Battery voltage dropping under load is normal and expected. It is perfectly normal/acceptable for the battery voltage to sag by 0.5 to 0.7 v under heavy load.

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All 4 cells are perfectly balanced while not under load (and mostly balanced while under a small load). This totals 32 millivolts, a tiny part of my one volt drop.

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The voltage you see when a battery is under (heavy) load has no relation to the voltage vs state of charge curve. This concept, known as voltage drop, leads to a slight production loss from your solar array.

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Probably your load has higher power usage and dissipation than your solar system so its not enough to run the system all the time. The system voltage drop you see at night when the sun goes down is the charge controller moving into a resting mode with no energy to contribute to the system.

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If you rest the batteries for a few hours they will recover and you will be able to ascertain what there true state is. The morning voltage may reflect a load present that is effecting the voltage level.

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This concept, known as voltage drop, leads to a slight production loss from your solar array. Let's calculate the amount you will lose:

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It will start to run at these parameters but the voltage will decay eventually. If you rest the batteries for a few hours they will recover and you will be able to ascertain what there true state is.

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Some say it can be reversed, but dont count on it as that is not proven technology. Under no load the battery voltage reads 13.09v, but once i start pulling 10 watts the voltage drops to 12.4v and keeps dropping after a few minutes.

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Under optimum conditions and no load, your panels will have a voltage of 22.1 volts. (picture below is with load and without load).

This Leads To The Situation That Especially During Absorption The Battery Output Is Below The Desired Voltage.

The voltage will drop under load depending how much power you are using. This concept, known as voltage drop, leads to a slight production loss from your solar array. Probably your load has higher power usage and dissipation than your solar system so its not enough to run the system all the time.

This Totals 32 Millivolts, A Tiny Part Of My One Volt Drop.

Battery voltage drop under load it is hard to say just how much sulfation may or may not be there, but without putting a full charge on the batteries you are going to windup with junk for batteries for sure. A battery that shows a voltage of 12+ volts but falls below 10 volts under load and only. The voltage you see when a battery is under (heavy) load has no relation to the voltage vs state of charge curve.

Battery Voltage Dropping Under Load Is Normal And Expected.

Let's calculate the amount you will lose: If the voltage across the battery is good, move on down the circuit (wires) until you get to zero. Range between 80% to 100% yields above rated output voltage, but the voltage drops quickly.

It Is Perfectly Normal/Acceptable For The Battery Voltage To Sag By 0.5 To 0.7 V Under Heavy Load.

To eliminate these external factors, turn off all loads and disconnect the solar array to allow the battery voltage to stabilize. 10 volts on a battery without load shows a dead cell and when put under load will usually fall well below 10 volts. Your solar battery has charged 120w/s and your load is constant 5a,30v which means 150w/s.

Most Of The Drop Is Within The Batteries Themselves.

As you can see in the calculation, the voltage drop is 4.09% which will reduce the overall power delivered to the charge controller. 0.74 volts x 5.8 amps = 4.3 watts. This voltage drop calculator is a tool to help plan your wiring run and get as much production as possible from your array.