Is anyone using the MPP Solar 12V LV PIP and not getting full charging.

NoSmokeYet · Apr 21, 2020

Dave, I have the same setup as you and have just started watching the numbers lately. I don't think the numbers are ever going to add up. Here's mine right now 37V x 0A=140 watts. The other day I saw 42V x 18A=284 watts. Someone will let us know what's up.
PIP 812 LN-MS, (4) 100w panels 2S2P, 6ga wire back to controller.

Dave1 · Apr 21, 2020

I've also found the fan running when the inverter is off and it is just charging off solar. Not sure why this would be. I thought there was a setting that might improve this, but can't find it.

NoSmokeYet · Apr 21, 2020

Keeping the charger cool? Mine does it too when charging at the higher amps.

mrdavvv · Apr 29, 2020

cotrailhead said:
I have been working on this same issue with my Pip Lv2424. I never witnessed my SCC bulk charging automatically. However, I found that if I switched the PV breaker to off, waited a minute, then flipped the breaker back on, the SCC would begin a bulk charge cycle.

I've been reading extensively on where to set a float voltage for Lifepo4. I see recommendations ranging from 26.4 all the way to 27.2. I see Battleborn mentioning that anything under 27.2 is fine. Then on another site, I found where almost no charging happens below 27.2 and that is why Battleborn recommends a float below that level. Does charging happen below 27.2 volts? If not, then should I force a bulk charge cycle occasionally? I see a problem because if my battery has not gone through a bulk cycle, and no charging occurs below 27.2 volts, then I could have a full day of sun and not have a well charged battery by nightfall. Then through the night my inverter could shut down due to low voltage and be forced to run the generator after a sunny day. As a side note: I'm still wating on my BMS that I ordered in January. When that arrives, I should have Coloumbe meter and be able to know my actual SOC more accurately.

Im having the same doubts, as you mention there is a lot of diferent data on the internet.

Will recommends 27V, so im inclined to do that, i wouldn't go higher for this:

Overcharging

Overcharging means applying a charging voltage to an already fully charged battery. As we just highlighted the fact that – given enough time – lithium batteries always fully charge at 3.4V/cell or above, any voltage from 3.4V up can most definitely overcharge and damage a lithium battery.

How quickly this happens certainly depends on how high this voltage is, but – unlike what is observed with lead-acid chemistry – there is no such thing as a safe charging voltage that can be maintained continuously with lithium cells. All charge cycles must end when or before the battery becomes full.

So if the MPP its providing all the time 27.2V maybe that could happen?. I think we need to make sure that float doesnt really charge the battery. In fact we dont need float voltage, howemever it could be usefull if you have some loads directly conected to the 24V bus, so they can be feed by the charger and not the batteries.

Right now im at 26.4V. As 27V its higher than the normal resting voltage of the batteries (When they are charged) so the inverter was always pushing current to the bateries.

However its still not my definitive value as with that voltage the contrary seems to happen, the inverter its drawing 2A all the time!.

Im triying to figure out how the SCC of the LV2424 works, talking about it in here:

LV2424 Charging Problem

With my lv2424 the absorption does happen very quickly. Now tictag says that the bulk phase of charging should be constant current but if I set my SCC to 50 amps max charging and I only have solar power (1380 watt array nominal) the current does not remain constant during the bulk phase. If...

diysolarforum.com

JoseAgustinV · May 4, 2020

Dave1 said:
I got 400w of solar installed on the roof and am a little perplexed by the numbers going into the battery. They are connected 2S2P using 10ga wire

The voltage and amps make sense, but the reported watts in doesn't add up. Thoughts.

36Vx9A should equal 324W (which does seem high given where the sun is, but that is what is measured and what my multimeter confirms.

So why am I only getting 140W?

I had the same doubt, this unit comes with Solar Power Balance and you cannot disable it, this is setting 31 on other larger MPP solar units.

You can read what Solar Power balance means on the manual, but in short terms, the solar panels will give you only the Watts you need to keep the inverter on and to charge your batteries and load if you have 0% load and the battery is full you will get about 30W only for solar because that is what you need, you can test it by applying more load to the inverter, the PV watts indicator will get higher if you apply more load in watts to it.

I wish I could disable this setting on the 12v MPP solar unit, so I can have a real idea of what is the mas watts I could get depending on the sun, Idk why they don't allow us to disable the Solar Power Balance on this unit.

JoseAgustinV · May 4, 2020

Psolar said:
I’m experiencing the same symptoms. 13.5v max at the PIP display and volt meter at PIP / battery connection. My Battery Go BG-8s says 13.2v. Battery is Lifepo4 12v Sinopoly. Now 13.5v is 99% charged so?

This is normal: if you check your screen display when the battery is about to full charge, it will go to max bulk charge voltage very fast (should be like 14.1-14.5V depending on unit settings), then it will drop to float charge voltage which is usually 13.5V, it is normal that the screen will display 13.5V at full charge @Dave1

Is anyone using the MPP Solar 12V LV PIP and not getting full charging.

NoSmokeYet

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Dave1

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NoSmokeYet

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mrdavvv

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LV2424 Charging Problem

JoseAgustinV

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JoseAgustinV

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