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Old 01-12-2024, 05:49 PM   #1
Almost There
Join Date: May 2021
Location: Santa Barbara, CA
Posts: 75
48V vs 24V: why/why not?

I have:
-skoolie build
-24V system
-4 x 12V 100Ah Amperetime lifepo4 batteries (5000Wh battery capacity)
-6 x 185W 36V 5A panels ~1100W (either 3s2p @ 108V 10A or 2s3p @ 72V 15A)
-gifted 30A 48V to 12V buck converter (with inline fuse)
-also have 40A 24V, but can buy higher 48-12 capacity converter
-now broken 24V Edecoa 3000W inverter. Came with bus (Edecoa brand), cheap, and temp fan (or something) stopped working recently, so I'm going to upgrade and get a new all in one, which was the plan for some time now.
-lynx distributor

Why not 48V? What are cons of 48V vs 24V besides 24V needing bigger wires and more inefficient? My system is small (1100W + 5000Wh battery capacity), but if 24V vs 48V all in one unit price is the same, why not save $ on wiring and go 48V? Could expand system later on, but will still have plenty as is.

I've decided on a growatt all in one system. Was gonna get 24V but now I'm thinking why not 48V? The only specific thing I had that was 24V specific was inverter and charge controller. I'm replacing both those, so why not 48V? Seems like at 24V, I'm just paying more for wire and I'm replacing all equipment with 48V or 24V all in one, anyways.

4 batteries in series charging issues? Thought worse charging with parallel? Other potential issues?

Buck converter at 30A: I'll never come close to that.
12v loads: 26.5Amps if all on at once
6 gal water heater 12Amps
Water pump 8Amps
Furnace 6.5Amps
Maybe some max air fans I'll install way down road.

Yes, 40A+ buck would be good for extra ceiling and I have a 24V one, but I was given a 48V 30A. I can buy a new one with higher Amp capacity.

Other reason to do 24V vs 48V?

Kwest364 is offline   Reply With Quote
Old 01-13-2024, 08:19 AM   #2
Join Date: Mar 2022
Location: Middle TN
Posts: 155
Year: 2008
Chassis: IC RE (PB30500)
Engine: Maxxforce DT
Your post seems like you're wanting to go 48v but waiting for someone to give you the push so...

If you're having to buy all new stuff anyway I'd say go 48v. More efficient, less overheating issues due to lower amperages, save money on wires. I'm going 48v as well. I'm a long ways from install but I have the Growatt 8k split phase inverter sitting in my closet waiting till I'm ready. I needed the extra umph for my long term plan of using the bus as a base for a homestead.

As far as 48v to 12v converters, I found this guy: Daygreen 1800w. It seems to be the cheapest/highest wattage out there from a decent company.
2008 IC RE 40ft w/ Maxxforce DT and Allison 3000 PTS for fulltime living w/ a family of four.
Clouse House is offline   Reply With Quote

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