MisterSandals
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What setting(s) are you referring to? What was default and suggested (i am following along without having the home game)?
Renogy Rover Lithium settings
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MisterSandals
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Well Equalization is moot because duration should be set to zero.
Boost default=14.4V is a pretty aggressive charge and represents the max charge the cells, if all exactly equal, will handle. We know cells aren't the same voltage, especially at the extremes so 14.0V is a realistic, full charge.
Float, its mostly a "minimum state of readiness" charge. It really matters how you are using your battery(s). Folks using them continually (with a fridge thats always on for example), having a higher state of charge makes sense.
My RV sits mostly unused. LiFePO4 batteries don't like to be kept at high voltages for extended periods so i have my float value down low, around 13.2V most of the time. I bump this up a couple days before a trip, maybe to 13.4V.
You're in great shape with those settings. You've gotten expert level help from Bob and Mike.
SolarShed
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Fantastic. That makes so much sense. I lowered my parameters to 14.0 v. It only allowed me to change boost, but when I changed boost, equalize and float also changed to the same value.
But I guess I would have to make the user profile from scratch because I just edited the default lithium profile.
But I guess I would have to make the user profile from scratch because I just edited the default lithium profile.
solarstuff
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I can't figure out HOW to set equalization time to zero, but am I correct in saying it shouldn't matter since the voltage I've picked is the same as boost?
SolarShed
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See my post above I just edited the default lithium profile and the equalization time is already zero.
However I'm not able to edit anything in the grey box just the white boxes
SolarShed
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Bob142
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I just checked the manual and the front panel interface on mine. You can't access all of the settings from the front panel. To fully program the User mode settings either the Renogy or Rich Solar* BT-1 module and app are necessary.
If you aren't planning on getting the BT-1 module/in the interim while you're waiting for it, I suggest setting your equalization voltage to whatever you decide to set your float voltage.
*(same product but sometimes the Rich Solar version can be found for cheaper)
Bob142
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I'm not seeing any difference between what I posted and your settings. I keep the boost at 10 mins just to hold it and get that last bit of charging as the current tails off. I don't think I've ever tried to make it zero.
SolarShed
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Sorry, Bob142, I got the posts mixed up. I'm using your profile for my Renogy 100 amp Smart lithium battery with self-heater (built-in heater). I live in colder climate. This new changes, shouldn't really affect that. So boost is ok for 10 minutes? I cant change it (if it needs to be).
Just to confirm, are these setting ok for my battery? Last thing I want to do is destroy my $950 battery lol!
Bob142
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I won't make any bold promises about your battery, but I use those settings on two Lion Energy batteries in parallel and I sleep very well at night.
SolarShed
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Fair enough. I'll be ok with an underperforming battery (if that is even the case), because I can easily fixt that by tweaking the parameters. I feel these new settings are conservative and safe for the battery.I won't make any bold promises about your battery, but I use those settings on two Lion Energy batteries in parallel and I sleep very well at night.
Bob142
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I suspect you will not be disappointed with your battery performance. If you find you need to tweak anything, please share here!
SolarShed
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Just wanted to provide an update on the new settings.
Yesterday I had some good sun in the morning as soon as it hit my two panels, the charge controller charged the battery at full throttle untill it hit 14 volts. At this point the battery was at 98% capacity, according to the app, and the charge controller basically trickled the rest up to 100% over the next few minutes.
My battery was 100% charged (100% capacity) at 14.0 V!
Worked quite well and and I'm starting to like this new charge profile quite well actually.
It doesn't seem to get out of boost though. Once it hits 14 it just basically stays on Boost (for more than 10 minutes).
Should it not be at float at this point?
Yesterday I had some good sun in the morning as soon as it hit my two panels, the charge controller charged the battery at full throttle untill it hit 14 volts. At this point the battery was at 98% capacity, according to the app, and the charge controller basically trickled the rest up to 100% over the next few minutes.
My battery was 100% charged (100% capacity) at 14.0 V!
Worked quite well and and I'm starting to like this new charge profile quite well actually.
It doesn't seem to get out of boost though. Once it hits 14 it just basically stays on Boost (for more than 10 minutes).
Should it not be at float at this point?
MisterSandals
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In your last pic, you have Boost Time set to 10 minutes. Its doing what its told do.
SolarShed
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Just wanted to provide an update on the new settings.
Yesterday I had some good sun in the morning as soon as it hit my two panels, the charge controller charged the battery at full throttle untill it hit 14 volts. At this point the battery was at 98% capacity, according to the app, and the charge controller basically trickled the rest up to 100% over the next few minutes.
My battery was 100% charged (100% capacity at 14.0 V!
Worked quite well and and I'm starting to like this new charge profile quite well actually.
It doesn't seem to get out of boost though. Once it hits 14 it just basically stays on Boost
Should it not be at float at this point?
And this is even before I use the battery. I mean once it hits 14 volts there's really no loads on it other than some small loads that run the equipment.
Yesterday I had some good sun in the morning as soon as it hit my two panels, the charge controller charged the battery at full throttle untill it hit 14 volts. At this point the battery was at 98% capacity, according to the app, and the charge controller basically trickled the rest up to 100% over the next few minutes.
My battery was 100% charged (100% capacity at 14.0 V!
Worked quite well and and I'm starting to like this new charge profile quite well actually.
It doesn't seem to get out of boost though. Once it hits 14 it just basically stays on Boost
Should it not be at float at this point?
But it seems to be on Boost for more than 10 minutes, I don't think I've seen float. but maybe I'll just check it more carefully next time.
And this is even before I use the battery. I mean once it hits 14 volts there's really no loads on it other than some small loads that run the equipment.
MisterSandals
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I'd think of it as being in an absorb kind of mode as long as its at 14.0V and this puts a good full charge on it. If it gets to 14.1V or it stays on longer than 15-30 minutes, then i'd be a little concerned.
First figure out how long it stays on "boost" and see if it stays at 14.0V. This could be a good thing, especially if you are full timing it in your RV and have continual loads (fridge, lights, clocks, phone chargers...).
I am not a full timer so i charge lower and float below settle voltage.
SolarShed
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hmm I think I found the problem; are the units in boost time minutes or hrs? there is a discrepancy in the app vs the Rover manual. Please see below. It seems to be consistent to being in hrs because because it stays in boost for hrs for me. let me try changing it to 1 hr of boost (or 60 min), as that seems to be the minimum??
@Bob142 have you actually timed your boost mode on your Rover?
@Bob142 have you actually timed your boost mode on your Rover?
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Bob142
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Interesting. Thanks for the update. I’ll have to check this on mine. I haven’t touched the settings in over a year but thought I timed it all out back then.
SolarShed
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IT would be great if you can look at this for us.
I did some investigating, it seems to be minutes not hrs. because it would not accept a number below 10 as it kept changing it to 10 if I did. So, having said that, when I changed the time to 60 minutes (which it accepted), which supposedly is the minimum that the chart says, it still was in boost after 60 minutes.
Here's the interesting part is that it seems to be acting as float despite that it says boost, because the voltage never went past 14.0 and the current (according to the smart battery BMS), was 0.00 A.
There must be something that is overwritten with this setup.
After discovering that 60 minutes did not solve the boost situation, I starting looking into floating Lithium batteries in general. And I've learned its definitely not good to do this when the battery is full (which we are not doing) but, its also not required because there is no self-discharge of the Li batteries (or very little of it), so, hence that is why float is not required.
So thinking about this, if my battery hits 14 V and stays there, it won't drop to the boost return voltage anytime soon (unless I use the battery of course).
I tried this charging profile, which is basically the standard lithium LFP profile from Renogy, but trimmed the top end a bit. This does the same thing, hits 14V stays there, no current to battery and stays its in boost. Its like my controller is there in MPPT charge mode or boost. I think its doing what it should be doing? Does this make any sense?
I did some investigating, it seems to be minutes not hrs. because it would not accept a number below 10 as it kept changing it to 10 if I did. So, having said that, when I changed the time to 60 minutes (which it accepted), which supposedly is the minimum that the chart says, it still was in boost after 60 minutes.
Here's the interesting part is that it seems to be acting as float despite that it says boost, because the voltage never went past 14.0 and the current (according to the smart battery BMS), was 0.00 A.
There must be something that is overwritten with this setup.
After discovering that 60 minutes did not solve the boost situation, I starting looking into floating Lithium batteries in general. And I've learned its definitely not good to do this when the battery is full (which we are not doing) but, its also not required because there is no self-discharge of the Li batteries (or very little of it), so, hence that is why float is not required.
So thinking about this, if my battery hits 14 V and stays there, it won't drop to the boost return voltage anytime soon (unless I use the battery of course).
I tried this charging profile, which is basically the standard lithium LFP profile from Renogy, but trimmed the top end a bit. This does the same thing, hits 14V stays there, no current to battery and stays its in boost. Its like my controller is there in MPPT charge mode or boost. I think its doing what it should be doing? Does this make any sense?
Bob142
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I’ll try it out again tomorrow, sun permitting, and see what I get.
My BT-1 display is different then yours, every things white, I wonder if they up dated appearance? I just bought mine a month or so ago. Bummer
Bob142
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Nah, it’s just my phone set to dark mode.
I wonder why you have Battery Rated AH(AH) between system voltage and battery type. Mine doesn't. hmm. I wonder if it madders?
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