# What Size Charge Controller for 400w Solar Panel?

12/17/2021

When in doubt, the normal 400 watt solar pannel has a current result of 10 amps and open circuit voltage of 50 volts. At the same time, a solar charge regulator size of 60 volts information and current rating of something like 20 amps will be required. MPPT charge controllers are liked over PWM solar charge controller.

A 400 watt sun powered charger measures around 80 inches x 40 inches (2032mm x 1016mm), or a space of 22 square feet (a little north of 2 square meters!)

It's the greatest size of solar pannels – it weighs around 50 pounds (22kg) and will in general be utilized for complete establishments mounted on rooftop tops. It's more financially savvy to introduce the bigger wattage boards.

Be that as it may, to utilize only a couple, for battery charging or fabricating a reinforcement sun oriented generator for home or setting up camp, then, at that point, you'll need to know the electrical determinations.

## How Much Power Does a 400 Watt Solar Pannel Produce?

The Electrical Properties displayed in the picture beneath are taken from a LG sunlight based charger determination sheet.

It shows the voltage and flows related with the LG 400 watt board, likewise productivity.

Notice that every one of the qualities rely upon the Standard Test Conditions (STC). Fundamentally, these are ideal lab conditions and are seldom found, in actuality, circumstances.

As a rule, you can expect around 75% of the power yield portrayed in the maker's spec sheet, for a 400 watt board, read 300 watt to be practical.

For measuring a sun oriented charge regulator the two numbers that interest us are the Open Circuit Volts (Voc) 49.3 volts, and MPP Current (Impp) 9.86 amps.

MPP represents Maximum Power Point. (peruse more with regards to MPP here.) This is the point at which the upsides of voltage (Vmppp) and (Impp) give greatest power yield in watts:

Vmpp 40.6 x Immp 9.86 = 400.3 watts (STC)

## What Number of AMPS Does 400 Watts Deliver?

A normal worth of current for a 400 watt sun powered charger is just shy of 10 amps. Note that this isn't significantly less that the board's Short Circuit Current (Isc) which is 10.47 amps.

Assuming that you at any point have a sun powered charger with no mark, this is a simple method for approximating the greatest current conceivable under working conditions.

Coincidentally Impp is around 95% of Isc, however how would you track down Isc

Essentially set a multimeter to its present setting and use it to short the sunlight powered charger leads together. ISC will be displayed on the multimeter scale.

Duplicate the worth by 0.95 and you have the board's greatest working current.

Note: Shorting sun powered charger leads together through a multimeter can't harm the board. Since the board lead obstruction is so low, the voltage is adequately zero.

This implies power (watts) is likewise zero:

0V x 10.47 amps = 0 watts

## What Amount of Time Will It Require for a 400 watt Solar Panel to Charge My Battery?

Assuming utilizing a normal worth of 4 pinnacle sun-hours for irradiance, a 400 watt sunlight based charger will produce 1600 watt-long stretches of energy during the day.

What size battery could this measure of energy charge?

1600 watt-hours is equivalent to 133Ah. Expecting a solar lead-corrosive battery with half Depth of Discharge, then, at that point, the battery size that could be re-energize in a day would be 266Ah.

This doesn't appear to check out, as a 400 watt board can produce only 10 amps of current, and 133Ah partitioned by 10 amps = 13.3 hours, least.

In any case, recollect that the most extreme power voltage is going into the solar charge controller is 40.6V – north of 3 times more than the battery charging voltage.

The excellence of MPPT solar charge controllers is that they convert the greatest power into a higher charging current for example the higher voltage gets changed over to around 14 volts and the additional voltage is changed over into additional current. (An extremely improved on clarification!)