Question about Solar Panel

hi sir/ma'am i have a question regarding in device specifications

1. how many amperes of lead acid battery i'm gonna use if my solar panel is 50w?

2. what is the use of charge controller? can i directly connect the solar panel>> lead acid battery>>12v devices?

3. what's the meaning of specification written in solar panel (Maximum system voltage: 800V)?


tnx

how to arrange solar panel whether parallels or series in other to get a highest efficiency ?

brian25 said:

1. how many amperes of lead acid battery i'm gonna use if my solar panel is 50w?

Click to expand...

Using raw math...

50W will push 4 A into a 12V battery. (Theoretically. Your real figure will almost certainly be less.)

A safe charge rate is commonly said to be C/10. On that basis this means your battery can be 30 or 40 Amp-Hours.

Now suppose a day of charging lasts 10 hours. Then 40 Amp-Hours will go to the battery in one day. So on that basis, a suitable A-Hr rating for your battery would again be 40 A-Hrs.

If your battery is a gel cell, then you should be particularly cautious to avoid too fast a charge rate.

2. what is the use of charge controller? can i directly connect the solar panel>> lead acid battery>>12v devices?

Click to expand...

Yes, you can do without a commercially-manufactured charge controller. But you must take some steps to prevent the battery from getting overcharged. Example, monitor its volt level continually, and stop charging when it gets above 14.5 or 15V.

3. what's the meaning of specification written in solar panel (Maximum system voltage: 800V)?


tnx

Click to expand...

Probably the insulation rating between the frame and the electrically-live parts (PV cells and wiring).

BradtheRad said:

Using raw math...

50W will push 4 A into a 12V battery. (Theoretically. Your real figure will almost certainly be less.)

A safe charge rate is commonly said to be C/10. On that basis this means your battery can be 30 or 40 Amp-Hours.

Now suppose a day of charging lasts 10 hours. Then 40 Amp-Hours will go to the battery in one day. So on that basis, a suitable A-Hr rating for your battery would again be 40 A-Hrs.

If your battery is a gel cell, then you should be particularly cautious to avoid too fast a charge rate.



Yes, you can do without a commercially-manufactured charge controller. But you must take some steps to prevent the battery from getting overcharged. Example, monitor its volt level continually, and stop charging when it gets above 14.5 or 15V.



Probably the insulation rating between the frame and the electrically-live parts (PV cells and wiring).

Click to expand...

Charge controller is the MPPT charge controller if you connected you will get charge your battery efficiently the reason Panel (Source) impedance must match the load impedance(Battery),If you connect Battery directly to panel, Battery will become burden on panel & panel voltage drops down which leads less power (panel Voltage*panel current) & your battery may not get charge even at more intensity of light

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Charge controller is the MPPT charge controller if you connected you will get charge your battery efficiently the reason Panel (Source) impedance must match the load impedance(Battery),If you connect Battery directly to panel, Battery will become burden on panel & panel voltage drops down which leads less power (panel Voltage*panel current) & your battery may not get charge even at more intensity of light

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Highest efficiency depends on the charge controller (MP PT Charge controller). Choice of MP PT is again on type of power whether low power application or high power application, for low power application any MP PT based on PWM technique will do, For higher power application MP PT based on perturb&observe technique is better. If you are using MP PT based on PWM technique Series arrangement of solar panel will give boost current. If you are using MP PT based on perturb&observe technique parallel arrangement of solar panel will give high efficiency with safe on devices used in MP PT charger.

"the MPPT charge controller if yo". . . Please define your abbreviations when you first use them - - - Maximum Power. . .
Frank

Learn from here
https://voltaicsystems.com/blog/solar-charger-tutorial-part-1/

Whatever your controller is, first you have to calculate from your charging current. A 50W solar panel will have a average current: 3.3A. so if you have to use a battery and you need to charge it within a daylight, then consider your panel will gate proper sunlight around 4-6hrs depending weather condition.

So your battery should not large enough that will take longer time than it will get chance to be charged.

The MPPT charge controller can be defined as the charger unit with the facility of Maximum Power Point Tracking either from the Solar Or Wind energy,
Now Maximum Power = Vmp x Imp , Vmp & Imp & power rating are indicated on Solar panel, now only we should have to track at the available intensity of light maximum power point. Now set a maximum current Imp & note down the panel voltage at that max current as Vmp, then note this is the maximum available Power at this intensity of light, Take this reading as MP1(MP1=Vmp x Imp) then vary the duty cycle of the pwm to select the higher voltage (Vmp )than previous call it Vmp1 now we don't know current is same or varied but now for simple understanding think current not changed now Max Power MP2 = Vmp1 x Imp, then compare MP1 & MP2 if MP2>MP1 try to next further increase of Vmp by increasing Duty Cycle of pwm to track higher maximum power sample. If MP2<MP1 decrease Duty Cycle of pwm. This increase or decrease of pwm to select a new Vmp sample for Max Power Point, The point where further increasing Vmp leads on to reduce the power, that threshold point is known as Maximum power point.This whole phenomenon totally together called Maximum Power Point Tracking (MPPT)