The fans come on as soon as you power up the unit and also, I believe, when the inverter is not on but you are charging with either AC or PV. I have looked at the idle rate but cannot swear to the exact number as I don't usually concern myself with that. I believe it is just a few watts. I wish I could be more precise but I've had my unit for some time and I probably paid attention to those things at first but don't now. I will say that my unit is inside my camper and the fans don't bother me at all. I run a table fan most of the time so it is much louder and makes the MPP unnoticeable. If I use the MPP over the next few days I will take note and come back with more precise info.
My Settings for MPP Solar PIP-2024LV-MK 24V System
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Hagrid
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Thank you. I would hate to have a couple of fans running in a compartment a few feet away from my bed all night... Looking forward to any info you (or anyone else on this thread) can supply here.
iamrich
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I have the green hybrid unit and the fans run 24/7 if the inverter is on.
ender
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I don't know about the 2424LV-MSD but the 2024LV-MK idles at ~1.16A from 24V battery setup (the picture below shows 1.26A but 0.1A is from the RPi4 I have connected) when inverter is on.
As for the fans, in the setup pictured below (inverter on but not loaded), the fans are on but at a very low and quiet speed.
Hagrid
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Thank you. From what I have been able to glean from this forum and some YouTube videos, these MPP Solar all-in-one units have a programmable "energy-saver" mode where if the inverter load is low, the fans will either turn off or reduce speed significantly. As soon as the inverter load goes up, the fans go to high speed. Might be an OK sound level if in a compartment and inverter load is small.
iamrich
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I would not use this inverter in the same room I sleep in. The fans are going to be as silent as they can be at night since there is zero charging, but it is still nosier than I would be happy with. In my workshop it is no issue. I know there are quieter fans in this size that could be used and kind of wish MPP would have done so.
Assuming MPP Solar is basically the same as my GROWATT (2x100aH batteries, 800w solar). Thanx guys for posting so many answers to what has been puzzling me. SOME QUESTIONS: (#1) If I accidentally run down my batteries at night when unplugged from utility one battery shuts down on low voltage. How can I get system going when the sun comes up or is there a way to avoid the problem? (#2) Is there an easy way to monitor things? The app that came on a CD with my unit is too quirky. The updated version isn't much better. The Solar-Assistant mentioned above looks good. Can it be run without me having to learn Raspberry?
I'm absolutely no expert here but if only one battery shuts down it sounds like the battery is the problem. If both batteries were balanced properly this should not be happening but maybe someone else on this thread is better informed. As far as the Solar Assistant, while it does appear to be a great package i ended up not buying it. It is produced in South Africa and me being in the States made it a bit pricey to have the full system mailed. The download option is much cheaper (obviously) but then I'd have to buy the raspberry Pi, etc. So, instead i just used the Watch Power software that came with the inverter. Yes, it is quirky but you can export the graph data as an Excel friendly file. I have MS Office so i imported it into Excel and then was able to evaluate the data.
Thanx. The batteries are SOK. A quality brand, fairly new. They say the battery is operating normally. The batteries started out fully charged and balanced. Since they are connected in series to get 24v it is impractical to check individual voltages regularly I got PVKeeper (then 2.0) with my GROWATT. They work Ok for changing settings and a quick status check but crash a lot so they are not too useful for data logging. I played around with unit's settings and it seems to be working. Best guess is the settings didn't work with the reduced winter sunshine.
GrumpyOldRetiree
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For you folks putting 2 12v batteries in series to get 24v (nominal) and having power shutting down to the inverter because 1 battery went low, have you considered using this item?:
WYtreasure
It's not happy hour, I'm just like this.
Hey GOR,For you folks putting 2 12v batteries in series to get 24v (nominal) and having power shutting down to the inverter because 1 battery went low, have you considered using this item?:
Have you used that particular product.
As my build progresses I will probably be scratching my head over similar issues. It would be great to know how to deal with the problem when it arises.
Thanks for the link.
GrumpyOldRetiree
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No, I haven't. I'm still operating with 12V components (batteries & inverters). I brought it up because, I too am still in the "head scratching" phase of upgrading to higher voltage components. This device seems to address the issue of one BMS shutting down the output of both batteries (or input in the case of charging), but does not work to equalize SOC of the 2 batteries in series because voltage is a poor analog for SOC in LFP batteries (except at the extremes).Hey GOR,
Have you used that particular product.
As my build progresses I will probably be scratching my head over similar issues. It would be great to know how to deal with the problem when it arises.
Thanks for the link.
That sounds perfect. Have you actually used one?For you folks putting 2 12v batteries in series to get 24v (nominal) and having power shutting down to the inverter because 1 battery went low, have you considered using this item?:
GrumpyOldRetiree
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See post #38.
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