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Why don't inverter/charger makers list cut off/cut on voltages to maintain at least 110vac?

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strikehammer

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Dade city fl
I need to buy 48v charger/inverter support a 400w load that will cut off before ac voltage drops below 110v & cut back on at 1 or 2 vdc greater with no beeping, only switching. It can be preset or user defined, but this speck is not listed that I can find. What is the deal here?
 
strikehammer said:
I need to buy 48v charger/inverter support a 400w load that will cut off before ac voltage drops below 110v & cut back on at 1 or 2 vdc greater with no beeping, only switching. It can be preset or user defined, but this speck is not listed that I can find. What is the deal here?
Click to expand...

I really don't even understand the question.

When inverting, most inverters have a very tight tolerance on output voltage. When passing through grid voltage, they can be programmed or by default have a notably larger tolerance.

For example:

I have a Victron 48/5kVA inverter. It outputs 120VAC all the time. In your scenario, the load would never shut off because my inverter will not ever put out < 110VAC.
 
I have 1960w of solar hooked up an 80a charger & a 12v 120vav inverter with a 12v lifepo4 battery supporting a constant 400w load. It starts dropping the ac voltage below 110v when the batteries drop below 11vdc. It continues to drop the voltage to about 85vac while beeping before finally cutting off. I am going to upgrade to a 48v inverter charger with 4 12v lifepo4 batteries. I don't need anything complicated, just one that will cut off before dropping below 110v output then cut back on when the batteries recharge enough to support the load as solar output increases. I would guess about 42 off & 44 back on. I have not seen this spec listed on any of the units I have looked at online, & calling Cust service to ask ends up with being on hold indefinitely.
 
strikehammer said:
I have 1960w of solar hooked up an 80a charger & a 12v 120vav inverter with a 12v lifepo4 battery supporting a constant 400w load. It starts dropping the ac voltage below 110v when the batteries drop below 11vdc. It continues to drop the voltage to about 85vac while beeping before finally cutting off. I am going to upgrade to a 48v inverter charger with 4 12v lifepo4 batteries. I don't need anything complicated, just one that will cut off before dropping below 110v output then cut back on when the batteries recharge enough to support the load as solar output increases. I would guess about 42 off & 44 back on. I have not seen this spec listed on any of the units I have looked at online, & calling Cust service to ask ends up with being on hold indefinitely.
Click to expand...
Your inverter is faulty. Inverters shut down on low DC voltage at a point that they can no longer preserve rated AC output voltage. In some like from AIO's they transfer to an alternate source at programmable DC voltages to preserve AC output.
 
I have not seen what you’re looking for.

Short of shutting the inverter off on the remote switch with something you rig for your two different conditions of first low VAC to trip the switch, than SOC to rest it, I don’t think you’re likely to find anything.
 
hwy17 said:
The AC output voltage should not vary proportionate to the DC voltage. It doesn't work like DC voltage X multiplier. Inverters can be better or worse at maintaining their voltage, but good inverters are pretty good at it. Low output voltage is not a common problem.
Click to expand...

+1

Mattb4 said:
Your inverter is faulty. Inverters shut down on low DC voltage at a point that they can no longer preserve rated AC output voltage. In some like from AIO's they transfer to an alternate source at programmable DC voltages to preserve AC output.
Click to expand...

+1

strikehammer said:
I have 1960w of solar hooked up an 80a charger & a 12v 120vav inverter with a 12v lifepo4 battery supporting a constant 400w load. It starts dropping the ac voltage below 110v when the batteries drop below 11vdc. It continues to drop the voltage to about 85vac while beeping before finally cutting off. I am going to upgrade to a 48v inverter charger with 4 12v lifepo4 batteries. I don't need anything complicated, just one that will cut off before dropping below 110v output then cut back on when the batteries recharge enough to support the load as solar output increases. I would guess about 42 off & 44 back on. I have not seen this spec listed on any of the units I have looked at online, & calling Cust service to ask ends up with being on hold indefinitely.
Click to expand...

You have a piece of shit or faulty inverter.

www.currentconnected.com

Victron 48V Phoenix 1.2kVA 120V Inverter | Current Connected

Trust the Victron 48V Phoenix Inverter for unparalleled reliability, advanced features, and precise configurability. Power your world with confidence!
www.currentconnected.com www.currentconnected.com

With the VE.Direct smart dongle, you can program it to whatever stop/start voltages you want.

Will's video on that page even shows you how to do it.
 
sunshine_eggo said:
www.currentconnected.com

Victron 48V Phoenix 1.2kVA 120V Inverter | Current Connected​

Click to expand...

No joke, this inverter is great.
 
strikehammer said:
I have 1960w of solar hooked up an 80a charger & a 12v 120vav inverter with a 12v lifepo4 battery supporting a constant 400w load. It starts dropping the ac voltage below 110v when the batteries drop below 11vdc. It continues to drop the voltage to about 85vac while beeping before finally cutting off. I am going to upgrade to a 48v inverter charger with 4 12v lifepo4 batteries. I don't need anything complicated, just one that will cut off before dropping below 110v output then cut back on when the batteries recharge enough to support the load as solar output increases. I would guess about 42 off & 44 back on. I have not seen this spec listed on any of the units I have looked at online, & calling Cust service to ask ends up with being on hold indefinitely.
Click to expand...
What inverter is this?
Other than replacing it cuz it's probably broken or something:
The easiest way to do it is have a microcontroller watching voltage and to just flip a relay off

sunshine_eggo said:
You have a piece of shit or faulty inverter.
Click to expand...
right? My power bricks support 240v - 90v input so it should start it's drop at 240v instead of 120! o wait
 
The schneiders, SW4048 or XW Pro both have detailed LBCO and recovery settings, for shutdown and recovery based on battery voltage.

I imagine these settings are common in most decent inverters.
 
hwy17 said:
The schneiders, SW4048 or XW Pro both have detailed LBCO and recovery settings, for shutdown and recovery based on battery voltage.

I imagine these settings are common in most decent inverters.
Click to expand...
They are.
At least in all that have user adjustable settings.
But even the cheapest ones without adjustable settings shouldn't lose track of output voltage.
 
strikehammer said:
I have 1960w of solar hooked up an 80a charger & a 12v 120vav inverter with a 12v lifepo4 battery supporting a constant 400w load. It starts dropping the ac voltage below 110v when the batteries drop below 11vdc. It continues to drop the voltage to about 85vac while beeping before finally cutting off. I am going to upgrade to a 48v inverter charger with 4 12v lifepo4 batteries. I don't need anything complicated, just one that will cut off before dropping below 110v output then cut back on when the batteries recharge enough to support the load as solar output increases. I would guess about 42 off & 44 back on. I have not seen this spec listed on any of the units I have looked at online, & calling Cust service to ask ends up with being on hold indefinitely.
Click to expand...
A Victron pheonix 48/800 or 48/1200 should do what you are looking for, by shutting off based on voltage. However I'm not sure about the audible alarm, you can't set low battery shutdown above the value for low battery restart and alarm.

Screenshot_20240331_072725.jpg


You will need a Bluetooth ve.direct dongle or usb->ve.direct cable to access those settings.
 
Last edited:
Brucey said:
A Victron pheonix 48/800 or 48/1200 should do what you are looking for, by shutting off based on voltage. However I'm not sure about the audible alarm, you can't set low battery shutdown above the value for low battery restart and alarm.

View attachment 206019


You will need a Bluetooth ve.direct dongle or Cerbo etc to access those settings.
Click to expand...
OP did say they want no beeping. Does "restart & alarm" mean beeping?

The beeper can be removed from most devices though.
 
Turns out most inverter/chargers have this option, but It is not listed in the specs. The trick is to download the manual & look at the actual settings.
I looked at several & decided on a Renogy 48v 3500w unit.
 
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