48v to 24v converter

[scheek]

Logan5. Can a 48v solar step-down charger charge as 24v battery bank?

[Logan5]

huh?

[scheek]

huh?

Logan5. Can a 48v solar step-down charger charge as 24v battery bank?

[Logan5]

so your array is providing 48 volts and you want to charge a 24 volt battery? For this you do not use a step down converter. You would use a quality MPPT Charge controller. MPPT charge controllers can handle over 100v array input and will allow your to charge your 24v battery. Some high quality MPPT CC's can handle in excess of 150v array input. Higher array voltages allow longer wire runs over smaller wire with min. loss.

[Sunking]

No it takes 32 volts to charge a 24 volt battery. Next question.

[SunEagle]

There are a number of charge controllers that can charge batteries systems ranging from 12v, 24v or 48v. But only one voltage at a time. The input voltage to the CC from the solar panels has to be above the battery voltage.

[scheek]

so your array is providing 48 volts and you want to charge a 24 volt battery? For this you do not use a step down converter. You would use a quality MPPT Charge controller. MPPT charge controllers can handle over 100v array input and will allow your to charge your 24v battery. Some high quality MPPT CC's can handle in excess of 150v array input. Higher array voltages allow longer wire runs over smaller wire with min. loss.

Thanks.

[Logan5]

I hope you read what others had to offer as well.

[scheek]

I hope you read what others had to offer as well.

I did and thanks to all. I will follow thru with the 48v arrays. There will be 2. Each producing 25amps/144volts. Doing it this way will get me down to 2 runs of about #6 wire. I'll find two MPTT 48v chargers to go along with each array. Again, I appreciate the help.

[Mike90250]

Sizing your arrays to 144V is a mistake, unless you live in the Caribbean where it never drops below 67F. Otherwise, the first chilly morning - say about 35F, comes along, your arrays wake up with 170V and fry your charge controllers.
You should use the PV string sizer the Controller Mfg provides on-line, you input your array specs, and your 50 year record low temp, and it advises you if your array is properly sized.

[scheek]

Sizing your arrays to 144V is a mistake, unless you live in the Caribbean where it never drops below 67F. Otherwise, the first chilly morning - say about 35F, comes along, your arrays wake up with 170V and fry your charge controllers.
You should use the PV string sizer the Controller Mfg provides on-line, you input your array specs, and your 50 year record low temp, and it advises you if your array is properly sized.

I will. Good point. I had just read about the drop in temp and increase in voltage not long ago. I have checked one mft and they gave me recommendations. I'll go back and make sure they are aware that it gets cold here in the winter. Thanks.