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48V split phase inverter

R

rauan1

New Member
Joined
Dec 30, 2024
Messages
192
Location
Alaska
Hi everyone!
I am looking for 5000-7000W split phase inverter for my RV. I have two single phase Eco_Worthy 5000W inverters configured for split phase and they work just fine. My only problme is idle consumption rate. Two inverters together consume anywhere between 120-140W. I would like to replace them with a single inverter that has 50-70W idle consumption.
I have 8 360W solar panels on my RV roof and two Eco_worthy 48V 100Ah batteries. I hope to get one or two more batteries so I can be less dependant on shore power. My RV has two AC units which are not in use right now because we live in Anchorage, Alaska. If we move south I will most likely swap them to inverter ACs, but that's just the plan for future.
My problem is when we camp and I have inverters on they consume too much. I turn them off time to time which upsets my wife because she can't use microwave and electric kettle any time she wants. I could run everything else on porpane or on 12V which I can feed through DC-DC converter.
It is important that I have split phase, 48V battery support, low dile consumtion and prefferable not too heavy. My current 2 inverters weigh about 60 lbs together.
Any recommendation?
 
My Victron quattro 5000s run about 40w each or 80w total. I think the 3000s run 27w and I think the MP II versions run even less like 9-18w each.

Do you need split phase? If not you could run a 5000w single phase inverter like a multiplus. If you're not using 240v appliances you can just combine them to single phase and from the 6ga still pull 6kw. You could upgrade the wiring to pull more if needed and if you go with victron you can use their powerassist to get above the 1 leg 50a
 
I heard about Victron products, but I don't want to spend that much $ for my setup. There are so many all-in-one inverters in the market for portion of the price that Victron charges for their products that needs additional pieces to match the functionality of AIO inverters.

If I could get them used at discounted price I may consider Victron. I think Multiple-2 is a split phase inverter, that would probably work for me better.

Also, one thing I can't find the answer for with split phase inverters is power distribution for each leg. If inverter is 5000W split phase I guess it means it can provide total 5000W of power, but how it can distribute that power in each line. Will it max out at 2500W per channel or can feed up to 5000W in each if the second line is not loaded?
 
justinm001 said:
My Victron quattro 5000s run about 40w each or 80w total. I think the 3000s run 27w and I think the MP II versions run even less like 9-18w each.

Do you need split phase? If not you could run a 5000w single phase inverter like a multiplus. If you're not using 240v appliances you can just combine them to single phase and from the 6ga still pull 6kw. You could upgrade the wiring to pull more if needed and if you go with victron you can use their powerassist to get above the 1 leg 50a
Click to expand...
Technically, I don't think I need a split phase power. I am not sure about my dryer outlet in front of the rv, but the rest of the RV connections are 120V. I also didn't find any 240V line going out of the breaker box.
I could use single phase inverter too, but it needs to be 6-8000W inverter I think.
 
Adding a single 48v 100ah battery would more than cover your idle use and would be cheaper than changing inverters.

Most RV's don't have 240v appliances and just use the 2 phases to split the 120v loads. If that's your case, you should be able to run a big single phase inverter to power both legs or 2x more efficient inverters and you could even run them in parallel for better load sharing compared to split phase.

An alternative that doesn't cost anything (Assuming you don't really need 240v), you could reconfigure your current inverters to parallel and power both legs. Then if you don't need more than 5000w, just leave one turned off - your idle consumption is cut in half... When you need to run the AC, turn on the other inverter.

Also, if your fridge is like the one in my travel trailer, when you're not running on propane it's a power hog. I replaced mine with a residential unit and it used less than half as much power.
 
You get what you pay for. Victron is expensive because it works. Victron doesn't make any split phase inverters. It's like comparing snap-on tools to harbor freight.

Cant you get logging on your inverter to see how much power you're using max? Then you'll know the size you need.

Yes you're right a 5000w split phase inverter is max 2500w on each leg, compared to a 5000w single phase inverter which will run 5000w total. There's a lot of discussion on Victron on if you should stack vs split phase 2 inverters.
 
CommandoJoe said:
Adding a single 48v 100ah battery would more than cover your idle use and would be cheaper than changing inverters.

Most RV's don't have 240v appliances and just use the 2 phases to split the 120v loads. If that's your case, you should be able to run a big single phase inverter to power both legs or 2x more efficient inverters and you could even run them in parallel for better load sharing compared to split phase.

An alternative that doesn't cost anything (Assuming you don't really need 240v), you could reconfigure your current inverters to parallel and power both legs. Then if you don't need more than 5000w, just leave one turned off - your idle consumption is cut in half... When you need to run the AC, turn on the other inverter.

Also, if your fridge is like the one in my travel trailer, when you're not running on propane it's a power hog. I replaced mine with a residential unit and it used less than half as much power.
Click to expand...
Typically you can't program the inverters into parallel and still turn one off. You'd need to run both separately so only half the devices would work. I wish there was a system that would allow us to stack inverters in parallel and turn the 2nd on when the 1st is getting close to it's load.

One thing with switching to parallel and over 50a is you need to watch the netural line. If running 30a on L1 and 20a on L2 with split phase then the neutral is only carrying 10a (unbalanced load), but in parallel you're running 50a!! And the neutral doesn't have a breaker so you could be pumping 100a on neutral before one of the hots would be above 50a and trip.

If OP gets better inverters he'd save 70w or 1.7kwh per day.. basically a 400w panel in a nice area, which in Alaska I'm betting closer to 2 panels. He's losing over 15% just in idle consumption. Batteries only help store energy and I'm assuming OPs averaging about 10kwh per day of production.
 
McKravitts said:
sungoldpower.com

6000W DC 24V/ 48V Split Phase Pure Sine Wave Inverter With Charger

Discover the efficiency of our 48 volt split phase inverters at SunGoldPower, designed for optimal power conversion and reliability in various applications. Explore now!
sungoldpower.com sungoldpower.com
Click to expand...
77w idle and thats it's reported number. Basically the same as OP just running 1 is his inverters.

Honestly if I were top of just rewire and run 1 inverter then wire the 2nd up just to the 2nd AC or something else and only run it when needed.
 
justinm001 said:
Typically you can't program the inverters into parallel and still turn one off. You'd need to run both separately so only half the devices would work. I wish there was a system that would allow us to stack inverters in parallel and turn the 2nd on when the 1st is getting close to it's load.
Click to expand...
Outback (V)FX inverters in a parallel stack will leave the slave inverters asleep until there is enough power demand to need them.
 
Last edited:
CommandoJoe said:
Outback (V)FX inverters in a parallel stack with leave the slave inverters asleep until there is enough power demand to need them.
Click to expand...
That's awesome! Wish mine did that.

Btw OP I just checked and the Quattro 5000s are 35w idle consumption with some people reporting less. Theres modes to lower that as well like aes
 
CommandoJoe said:
Also, if your fridge is like the one in my travel trailer, when you're not running on propane it's a power hog. I replaced mine with a residential unit and it used less than half as much power.
Click to expand...
Do you have a comparison for power consumptio bnetween your old fridge and the new one? I will check how much my fridge uses, but I think it is about 4-5 Amp on 110 V.
 
rauan1 said:
Do you have a comparison for power consumptio bnetween your old fridge and the new one? I will check how much my fridge uses, but I think it is about 4-5 Amp on 110 V.
Click to expand...
My fullsize residential fridge uses under 50w. It averages like 400w per day. It's so low I leave it on 24/7/365 even though my RV is always in storage.

Yes I'm happy with the 35w per inverter.
 
justinm001 said:
My fullsize residential fridge uses under 50w. It averages like 400w per day. It's so low I leave it on 24/7/365 even though my RV is always in storage.

Yes I'm happy with the 35w per inverter.
Click to expand...
That's is 10 times less than my current fridge. When you say residential, do you mean the size or it is something that was not manufactured to be in RV because it works only on 11V?
 
rauan1 said:
That's is 10 times less than my current fridge. When you say residential, do you mean the size or it is something that was not manufactured to be in RV because it works only on 11V?
Click to expand...
Both. I believe mines this model. It's fridge only and cabinet depth but huge and can't even hear it running. I have an electric cooler in the basement if I want a freezer. It's also inverter so no surges, I haven't actually seen it spike over 60w.

My old rv had a propane fridge and it used more power with the electronics than this fridge uses.

www.ajmadison.com

Frigidaire PRDA1922AF 33 Inch Refrigerator Column with 19 Cu. Ft. Capacity, Internal Water Dispenser, SpaceWise Organization, CrispSeal Crispers, EvenTemp Cooling, Door Alarm, Sabbath Mode and Star-K Certified

Frigidaire PRDA1922AF 33 Inch Refrigerator Column with 19 Cu. Ft. Capacity, Internal Water Dispenser, SpaceWise Organization, CrispSeal Crispers, EvenTemp Cooling, Door Alarm, Sabbath Mode and Star-K Certified
www.ajmadison.com www.ajmadison.com
 
rauan1 said:
Do you have a comparison for power consumptio bnetween your old fridge and the new one? I will check how much my fridge uses, but I think it is about 4-5 Amp on 110 V.
Click to expand...
My old one would use about 400w and run 60-70% of the time. I could see it distinctly cycling on and off in solar Assistant. The new one uses less than half as much power, but that's based on my total usage over night, since I can't even tell when it's running in solar Assistant now. It's a $200 residential unit (120v only) from Walmart that fits in the space of the old fridge. Has a bit more room inside also. Wish I would have replaced it when I first went off grid.
 
rauan1 said:
I am looking for 5000-7000W split phase inverter for my RV. I have two single phase Eco_Worthy 5000W inverters configured for split phase and they work just fine. My only problme is idle consumption rate. Two inverters together consume anywhere between 120-140W. I would like to replace them with a single inverter that has 50-70W idle consumption.
Click to expand...
You are looking for a Midnite Rosie 7048M inverter/charger (mobile version with neutral ground bond switching).

35W idle. 120/240V in single chassis. 43 lbs. Can surge to way beyond 7kW for compressor/motor starts etc.

Downside it costs $3k, and you need to provide your own sccs. I like the Victron ones, can do multiple units to have multiple strings to take into account shadows etc.

www.stellavolta.com

MidNite Solar MNROSIE7048M Mobile Inverter/Charger 7000W

Shop now for MidNite Solar MNROSIE7048M Rosie Mobile Inverter/Charger 7000W 48VDC.
www.stellavolta.com www.stellavolta.com
 
Brucey said:
You are looking for a Midnite Rosie 7048M inverter/charger (mobile version with neutral ground bond switching).

35W idle. 120/240V in single chassis. 43 lbs. Can surge to way beyond 7kW for compressor/motor starts etc.

Downside it costs $3k, and you need to provide your own sccs. I like the Victron ones, can do multiple units to have multiple strings to take into account shadows etc.

www.stellavolta.com

MidNite Solar MNROSIE7048M Mobile Inverter/Charger 7000W

Shop now for MidNite Solar MNROSIE7048M Rosie Mobile Inverter/Charger 7000W 48VDC.
www.stellavolta.com www.stellavolta.com
Click to expand...
if going with the Rosie inverter when they make more sense to go with midnight solar charge controllers as well?
 
littleharbor2 said:
if going with the Rosie inverter when they make more sense to go with midnight solar charge controllers as well?
Click to expand...
I'm thinking on an rv with rooftop obstructions maybe better to go with two smaller sccs , maybe two 150/35s with 4 panels on each. But 4s could be a problem, and 2s2p may not have sufficient voltage depending on Voc. If a single tracker is all thats needed then 4s2p on a classic 200 or classic 250 could be good choice.
 
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