Re: Backup DC power standardization with Photovoltiac battery systems?

[Mark Tinka <mark@tinka.africa>]

On 4/15/23 03:06, Sean Donelan wrote:

> If both PV battery walls and broadband CPE supported 
> Power-Over-Ethernet as a backup power source, that would work too.  
> POE supports greater distances than USB-C.

Well, you generally want to only power your devices off the battery if 
you are unable to generate power from PV, or if you have a grid outage.

The other issue is if you also want to use the grid as a charge source 
for the battery, you are going to need an inverter, in which case 
attaching DC loads to a DC bus that contains both the battery and a 
standard, el-cheapo hybrid inverter makes things tricky.

If you don't want to use the grid for anything, then your main source of 
charge current would be PV. If it's a 48V battery, you will need 
something else to step that voltage down for devices on the DC bus that 
require less than 48VDC.

Mark.