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MPP LV2424 configurations

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Intown offgrid

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Oct 9, 2022
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Hey folks, new to the forum and to solar generation. I have all new components, MPP LV2424 all in one, 2- 12 volt LiFp04 batteries in series and 3-200w x24v panels.
Batteries charge fine through the morning and into the afternoon but at night the batteries discharge and inverter shuts down with no load what so ever. All that is drawing current is the cooling fan. There is no configuration for the fan but wondering if there is a configuration that will work best to avoid the discharge. A bit aggravating to have to run a drop cord from house to new garage for a battery charger to “jump start” the inverter. It only takes 10 minutes on trickle charge for the inverter to come back on.
Any suggestions will be greatly appreciated.
System is being used for LED lighting in my garage at this current phase but plan to add more to the system in future.
 

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Similar issue.
I have 2427 hybrid. 2-12v SOK batteries to make them 24v.
I ran my generator all weekend at my cabin and couldn’t get the inverter to run off of the batteries for more than 10 seconds?
I only have Solar and Generator.

It would just shut down immediately after the generator was turned off? I played with various settings but i couldn’t get it to run off of the batteries.
 
Scoutmaster said:
Similar issue.
I have 2427 hybrid. 2-12v SOK batteries to make them 24v.
I ran my generator all weekend at my cabin and couldn’t get the inverter to run off of the batteries for more than 10 seconds?
I only have Solar and Generator.

It would just shut down immediately after the generator was turned off? I played with various settings but i couldn’t get it to run off of the batteries.
Click to expand...
If you connect laptop and view the configurations within watch power is your charge source priority at the correct setting?
I’m new to this also, just a stab in the dark.
 
Intown offgrid said:
Hey folks, new to the forum and to solar generation. I have all new components, MPP LV2424 all in one, 2- 12 volt LiFp04 batteries in series and 3-200w x24v panels.
Batteries charge fine through the morning and into the afternoon but at night the batteries discharge and inverter shuts down with no load what so ever. All that is drawing current is the cooling fan. There is no configuration for the fan but wondering if there is a configuration that will work best to avoid the discharge. A bit aggravating to have to run a drop cord from house to new garage for a battery charger to “jump start” the inverter. It only takes 10 minutes on trickle charge for the inverter to come back on.
Any suggestions will be greatly appreciated.
System is being used for LED lighting in my garage at this current phase but plan to add more to the system in future.
Click to expand...
The inverter consumes anywhere from 50w to 100w itself. So when there is no solar power for 16 hours you will see 800w-1600wh. for a 24v battery that is 32ah to 64ah of capacity.

About the only way to minimize that is to set power saving mode. Or to turn off the inverter when you no longer need it in the garage for lights.
 
Intown offgrid said:
If you connect laptop and view the configurations within watch power is your charge source priority at the correct setting?
I’m new to this also, just a stab in the dark.
Click to expand...
I’ll definitely need to hook it up to my computer and look. I tried various settings with no luck. I’ll be back to cabin next weekend and need to experiment. I’m nervous my 2- SOK 100ah 12v either don’t have enough horsepower to keep it running or maybe there’s something wrong with the BMS in the batteries.
 
Scoutmaster said:
Similar issue.
I have 2427 hybrid. 2-12v SOK batteries to make them 24v.
I ran my generator all weekend at my cabin and couldn’t get the inverter to run off of the batteries for more than 10 seconds?
I only have Solar and Generator.

It would just shut down immediately after the generator was turned off? I played with various settings but i couldn’t get it to run off of the batteries.
Click to expand...
Should start your own Thread. Based on the information provided it would seem that your issue is a battery issue and not an inverter issue.
 
Mattb4 said:
The inverter consumes anywhere from 50w to 100w itself. So when there is no solar power for 16 hours you will see 800w-1600wh. for a 24v battery that is 32ah to 64ah of capacity.

About the only way to minimize that is to set power saving mode. Or to turn off the inverter when you no longer need it in the garage for lights.
Click to expand...
Thanks Matt
Last night I turned off the converter just to have some lights early this morning. I have tried the power saving mode earlier, all that does it limit the amount of AC voltage out for standby. With no draw from the inverter overnight, it still dropped below the low voltage threshold and cut off. I think if it wasn’t for the fan running continuously things would be alright. I may have to see if I can return this unit or trade it back in and up grade to one that the fan only cycles when needed. It’s 45 degrees at night and it’s plenty cool with no load.
Not really any good for me unless I cough up another $800-$1000 for more batteries to get it through the night. With days getting shorter now will have no reserve if I get a cloudy day.
Thanks for the information and advice
Take care
 
Assuming 100Ah batteries.

You have 2560Wh of battery.
Your inverter consumes 45W*24h = 1080Wh.
You only have 600W of panels. Depending on your location, that solar may just barely replenish what the inverter is consuming.

You need to conduct an analysis of your loads and solar availability. This should be done before purchasing anything.

Fill out the energy audit spreadsheet, and you'll know where you need to spend money.

Constant fan running on these units is a common complaint.

diysolarforum.com

System Energy Audit and Sizing Spread Sheet

To get the spreadsheet, click on the orange button at the top of this page. This sheet is intended to help you plan your system. Fill it out down to the last decimal place, look at the results..... and then make your best guess;) Notes...
diysolarforum.com diysolarforum.com
 
Strange the fan runs continuously. It should only run when you have a load high enough to kick it on or if internal heat is high enough.
 
Last edited:
sunshine_eggo said:
Assuming 100Ah batteries.

You have 2560Wh of battery.
Your inverter consumes 45W*24h = 1080Wh.
You only have 600W of panels. Depending on your location, that solar may just barely replenish what the inverter is consuming.

You need to conduct an analysis of your loads and solar availability. This should be done before purchasing anything.

Fill out the energy audit spreadsheet, and you'll know where you need to spend money.

Constant fan running on these units is a common complaint.

diysolarforum.com

System Energy Audit and Sizing Spread Sheet

To get the spreadsheet, click on the orange button at the top of this page. This sheet is intended to help you plan your system. Fill it out down to the last decimal place, look at the results..... and then make your best guess;) Notes...
diysolarforum.com diysolarforum.com
Click to expand...
Thanks Sunshine
Yes 2- 100ah LIFeP04 batteries in series.
It’s just past 2:00 here in the Shenandoah Valley and the panels are still in full sunlight. They facing southeast. At around 3:30 - 4:00 they will be out of the direct sun. The batteries are fully charged presently. I had noticed that when the panels are out of the direct sun, they still maintain a small amount of output to carry charge up to dusk.
Thats the reason I wanted an off grid system due to my roof in constant sunlight. I have a fourth panel that I have not installed yet. Was going to mount it on the southwest side of roof to capture the afternoon sun. But again…batteries are up to charge.
 
Intown offgrid said:
Thanks Sunshine
Yes 2- 100ah LIFeP04 batteries in series.
It’s just past 2:00 here in the Shenandoah Valley and the panels are still in full sunlight. They facing southeast. At around 3:30 - 4:00 they will be out of the direct sun. The batteries are fully charged presently. I had noticed that when the panels are out of the direct sun, they still maintain a small amount of output to carry charge up to dusk.
Thats the reason I wanted an off grid system due to my roof in constant sunlight. I have a fourth panel that I have not installed yet. Was going to mount it on the southwest side of roof to capture the afternoon sun. But again…batteries are up to charge.
Click to expand...

Also very important that you charge your individual 12V to full before stringing them together in series. The two 12V must be at essentially identical voltages at absorption. If one battery is triggering OVP cutting off charge, your charger may interpret it as a full battery and go to float before you're fully charged.
 
So even with the unit “turned off” at night it was still low voltage in morning?

I think we’re experiencing similar problems.
I ran my generator for hours to top off the batteries and it still shut down for low voltage in maybe 15 seconds under 100watts of load.
I tried multiple setting but kept experiencing the shut-off.

It looks like it isn’t charging or wanting to run off of 2-12v lithium in series for 24v. I would think it would at least run for 1/2 day with 100watts of load. Like you I was hoping it would run a small load 24/7 with 2 100ah batteries.
Is the only viable solution 400ah+ and 1200-1600 watts of Solar? Just to run 100-200 watts 24/7?
 
sunshine_eggo said:
Also very important that you charge your individual 12V to full before stringing them together in series. The two 12V must be at essentially identical voltages at absorption. If one battery is triggering OVP cutting off charge, your charger may interpret it as a full battery and go to float before you're fully charged.
Click to expand...
Will disconnect the batteries tomorrow and check the individual voltage’s. Will report back.
Thanks
 
Scoutmaster said:
When you turn the unit “off” do your fans turn off? Mine seem to be staying on and screen lit?
Click to expand...
I configured my LCD to be off to save energy what little it consumes, but yes after I turn the power switch to the “off” position the fans continue to run but also my panels are still absorbing some light to create input to the inverter which is keeping it on but I think the fans consume more than what is being put back. Once it turned dark the unit shut down.
 
Intown offgrid said:
I configured my LCD to be off to save energy what little it consumes, but yes after I turn the power switch to the “off” position the fans continue to run but also my panels are still absorbing some light to create input to the inverter which is keeping it on but I think the fans consume more than what is being put back. Once it turned dark the unit shut down.
Click to expand...
How long will the unit run with the lights left on at night? How many watts are they pulling?
 
Ian from watts247 strongly recommended a battery balancer for 2-12v lithium’s in series.

Also said running 2 lithium 12v in series to make 24v can be a headache since the BMS will shut down to avoid over-charging tricking the inverter to shut down prematurely.
 
I ran a LV2424 Hybrid for about 6 months before moving up to a 48 Volt system. I was using 1600 watts of panels and started with two 12 volt 100Ah wired in series. I could run my fridge all night long and also my jet water pump (120volt), when needed, which draws a little under 900 watts. I then added 2 more 12 volt batteries and it helped a ton. One thing that many don't realize is these batteries should ALL be at the same level or they fight their selves and don't last long. What I did was take the new batteries and charge them with a lifepo4 charger at 12 volts, then series them at 24 volts and charge again. The 24 volt won't take long. Then after my batteries on solar max out I do the same process with those batteries. Then I hook them all up together in the system. If they aren't all at the same level you are just asking for trouble.
 
When you doubled to 4x12v 100ah did you continue to have problems? I was hoping to eventually have this system plug and play… and just ignore it for months at a time.
 
When I went to 200 AH on the 24 volt system it did help. Think of it this way 400 AH @ 12volt = 200 AH @ 24 Volt = 100 AH @ 48 volt.
I now run a sungold power 48 volt 6k split phase with 520 AH @ 48 volts and I have no issues now. I have the LV2424 on 200 Ah / 24 volt in my garage keeping a spare chest freezer running and any tools I need, so yes, doubling the AH helps as does going up to 48 volts. Had I known then what I know now I would have started right off at 48 volts. I also now buy the cells and a BMS instead of purchasing a ready to go battery. There is a 320 AH cell I have been using and I see them go on sale now and then. I think I paid $680 (that includes shipping) for 16 cells @ 320AH. I couldn't pass it up and just bought 16 more a few days ago as they are on sale again. It takes a while to get here and my expected delivery date to Pennsylvania is Nov 4th.
 
CoreyN3FE said:
When I went to 200 AH on the 24 volt system it did help. Think of it this way 400 AH @ 12volt = 200 AH @ 24 Volt = 100 AH @ 48 volt.
I now run a sungold power 48 volt 6k split phase with 520 AH @ 48 volts and I have no issues now. I have the LV2424 on 200 Ah / 24 volt in my garage keeping a spare chest freezer running and any tools I need, so yes, doubling the AH helps as does going up to 48 volts. Had I known then what I know now I would have started right off at 48 volts. I also now buy the cells and a BMS instead of purchasing a ready to go battery. There is a 320 AH cell I have been using and I see them go on sale now and then. I think I paid $680 (that includes shipping) for 16 cells @ 320AH. I couldn't pass it up and just bought 16 more a few days ago as they are on sale again. It takes a while to get here and my expected delivery date to Pennsylvania is Nov 4th.
Click to expand...
That’s some helpful information.
Thank you!
 
CoreyN3FE said:
I ran a LV2424 Hybrid for about 6 months before moving up to a 48 Volt system. I was using 1600 watts of panels and started with two 12 volt 100Ah wired in series. I could run my fridge all night long and also my jet water pump (120volt), when needed, which draws a little under 900 watts. I then added 2 more 12 volt batteries and it helped a ton. One thing that many don't realize is these batteries should ALL be at the same level or they fight their selves and don't last long. What I did was take the new batteries and charge them with a lifepo4 charger at 12 volts, then series them at 24 volts and charge again. The 24 volt won't take long. Then after my batteries on solar max out I do the same process with those batteries. Then I hook them all up together in the system. If they aren't all at the same level you are just asking for trouble.
Click to expand...
Sorry for jumping in with a question unrelated to this thread. I installed the same inverter for a friend and am having an issue with the 1/2 hp shallow well pump starting. Can you tell me what model well pump you have? Thanks
 
I have a question for you LV2424 owners and hope this is an appropriate thread to ask.

I’m looking for an AIO hybrid that can be configured to disconnect from grid when it is running off if battery power and will stop generating power from battery whenever it connects to grid (ie: when demand exceeds peak power capacity or when battery is drained).

Obviously when battery is drained and the LV2424 switches to grid-assist (or whatever they call it) there will be no battery power generated but once the battery charged to the point that it can start generating again, can it be configured to automatically disconnect from grid when it does?

And while I’m at it, another quick question:

I see the LV2424 has RS485 but can that be used only for communication with a BMS or can the LV2424 read out any data in slave mode and/or be configured remotely?
 
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