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Review please. 2 Inverters, 2 batteries with critical load panel

wsaharem

New Member
Joined
Jun 14, 2023
Messages
38
Location
Texas
Hello, I'm putting together my backup solution (minus solar for now). Attached is a picture of the whole solution (up to this point). Please let me know if this all makes sense.

I'm looking at:
2 Rosie Inverters
2 15kWh Batteries
Adding a Critical Load Panel

Couple of questions
a. I think the 150a BMS might be too small, since 300a x 48v = 14,400w, and the 2 Rosies can surge way above that. But even if I have 200a BMS, that seems to limit me on the surge side.
b. I'm considering the Victron Cerbo-S GX and the Smart shunt with the Lynx Distributor for all the data I can collect, but does it make sense to use the Victron eco system if I'm using the Rosie? (I can't seem to find if the Rosie has a similar setup for data).
c. Or, should I use the a 3rd party app like Solar Assist?
d. I'm not sure if the cost of the ePanel is worth it, but will definitely need the same set of breakers/fuses/cut-off switches etc, so it "will" keep it as an option to keep things clean.
e. Seems like I'm going into breaker overload if that is such a thing? For example, there will be a breaker on the inverter side and a breaker in the critical load panel and a breaker on the main panel into a breaker on the inverter.
f. I'm considering a fail over switch to the grid incase the inverters fail hard. Does that make sense? Would it be safe if I included generator interlocks for the specific breakers?




ImageOfUPS.jpg
 
even if I have 200a BMS, that seems to limit me on the surge side
Even a lot of ‘cheap’ 100A batteries allow 150 or 200A of surge for five seconds or something. Read your documentation for the batteries
 
Are you totally off grid?

Edit… just noticed that you have grid supply.

Have you thought about getting an Automatic transfer switch? Then you can be totally off grid or on grid.

Pacebms has 200A model. Checkout GobelPower batteries. Not a bad price for rack mount package. https://www.gobelpower.com/gobel-po...battery-gpsr1pc200-basic-512v-280ah_p114.html You should have cheaper 15kwh rack mount battery supply in the US. Eg ? Signature solar? Current connected?

Examples
TONGOU Din Rail 2P 4P ATS Dual Power Automatic Transfer Switch Electrical Selector Switches Uninterrupted Power 110V 220V 63A

| CNC 2P Din Rail ATS PV Inverter Dual Power Automatic Transfer Selector Switches Uninterrupted 63A 100A Photovoltaic Solar
https://a.aliexpress.com/_Ex2voWl (not if this would work for your voltage?)
 
Last edited:
Are you totally off grid?

Edit… just noticed that you have grid supply.

Have you thought about getting an Automatic transfer switch? Then you can be totally off grid or on grid.

Pacebms has 200A model. Checkout GobelPower batteries. Not a bad price for rack mount package. https://www.gobelpower.com/gobel-po...battery-gpsr1pc200-basic-512v-280ah_p114.html You should have cheaper 15kwh rack mount battery supply in the US. Eg ? Signature solar? Current connected?

Examples
TONGOU Din Rail 2P 4P ATS Dual Power Automatic Transfer Switch Electrical Selector Switches Uninterrupted Power 110V 220V 63A

| CNC 2P Din Rail ATS PV Inverter Dual Power Automatic Transfer Selector Switches Uninterrupted 63A 100A Photovoltaic Solar
https://a.aliexpress.com/_Ex2voWl (not if this would work for your voltage?)
Thanks for the input! No, not totally off grid. Have finally purchased 2 Rosies that will handle the switching for the critical load. Will post the project shortly.
 
Looks like a nice bit of kit.


The diy inverters are SRNE. I have them in powmr brand.
 
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