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MPP 5048MS or 5048MK inverters

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rasto
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Real Name: Rastislav

MPP 5048MS or 5048MK inverters

Post by rasto »

Hello everybody!

I have registered today to get some unanswered questions to me and to meet nice people from all around the world ;)
I would like to build a photovoltaic system to fully support my house during whole year except winter time because we have "smoky" sky for about 2 months with very little sun.

I have bought so far:
42pcs SUN275-60P with mounting,
Li-ion 38kWh CATL batteries 14S12P.
some breakers, 42U rack for battery storage, cables ....

Here is my house with panels schematic.
Up SOUTH, left EAST, 25 degree steep
Image

batteries
Image

panels with rack
Image


I am a greenhorn in this problematic and need to push in the right way according inverters
I am keen on MPP solar inverters in hybrid mode.
My vision is to have 2 inverters in parallel on one phase so total 10kW.

I am looking for a proper direction in inverters because what I have found there are problems with newer model 5048MK.

rasto
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Joined: Tue, 03 Mar 2020, 01:47
Real Name: Rastislav

Re: MPP 5048MS or 5048MK inverters

Post by rasto »

Nobody to help me with?

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coulomb
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Re: MPP 5048MS or 5048MK inverters

Post by coulomb »

The issue with the PIP-5048MKs (Axpert Kings) is unfortunately not unuque to them; most of the newer models seem to have a weird issue with PV charging dropping to zero.

I've not had time to investigate fully as yet, and I'm not totally convinced that it's not simple stuff like PV open circuit voltage being too high, and lately it seems, even too low.

The issue is discussed on another forum in many topics; this one seems to be the main one: Axpert - strange behaviour (Potential MPPT issue).

Edit: also, are 14S of those batteries a reasonable match for 24S of lead-acid (i.e. around 48 V nominal, with 48 V the lowest the battery is likely to be, and 58.4 V is enough to fully charge them?). I don't know those batteries, or the safety of charging that chemistry.

Edit 2: 60-cell panels will make for more convenient connection (3S) to PIPs with a 145 V max MPPT (such as the PIP 5048MS or the PIP-5048MK). So that's good. Though 42 panels (11.6 kW nominal) is way too much for one inverter. You will need either a second or third inverter, or other external MPPTs to make use of all the PV power you'll have.
Nissan Leaf 2012 with new battery May 2019.
5650 W solar, 2xPIP-4048MS inverters, 16 kWh battery.
1.4 kW solar with 1.2 kW Latronics inverter and FIT.
160 W solar, 2.5 kWh 24 V battery for lights.
Patching PIP-4048/5048 inverter-chargers.

rasto
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Joined: Tue, 03 Mar 2020, 01:47
Real Name: Rastislav

Re: MPP 5048MS or 5048MK inverters

Post by rasto »

Thank you sir.
I am planning to use two inverters parallel on one phase + one external charger like Makeskyblu.
For standard usage will 5kW be enough and from time to time additional 5kW will be needed.
The batteries are standard Liion chemistry which will be used visely to prolong their life.

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weber
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Re: MPP 5048MS or 5048MK inverters

Post by weber »

rasto wrote:
Tue, 03 Mar 2020, 02:21
I am keen on MPP solar inverters in hybrid mode.
I note that the PIP-5048xx inverters are not "hybrid" in the modern sense of being capable of both stand-alone and grid-feed operation. They cannot feed power to the grid at all. They are "hybrid" in the old sense of taking energy from multiple sources, PV and grid (or genset). But you probably already know that.

I suggest two PIP-5048MS simply because they have been around longer than the PIP-5048MK and so have had their known bugs fixed (if not by the manufacturer, then by Coulomb and I).

You would need to split your solar panels equally between the two inverters. Since your panels have 60 cells you must use strings of 3 panels, so you would have 7 strings going to each inverter. Every string should have its own 10 amp inline weatherproof fuse on the roof. Or else you must wire every string down separately to its own 10 amp DC circuit breaker near the inverter. The 3 panels making up a string must all be on the same roof-slope and orientation. Your diagram shows that this is easy to do.
One of the fathers of MeXy the electric MX-5, along with Coulomb and Newton (Jeff Owen).

rasto
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Re: MPP 5048MS or 5048MK inverters

Post by rasto »

Thank you I will do it like you said so.
Firstly, I was planning for 3 phase system but I figured out that it is not the way to go therefore I switch the plan for 10kw 1 phase.
Do not you know what kind of firmware are equip nowadays 5048MS inverters?

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weber
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Re: MPP 5048MS or 5048MK inverters

Post by weber »

rasto wrote:
Wed, 11 Mar 2020, 03:12
Do not you know what kind of firmware are equip nowadays 5048MS inverters?
I'm not sure I understand the question. I do not understand what you mean by "kind" of firmware.

You can see here, that they now come with version 72.40 firmware. But Coulomb and I can only offer patched firmware 72.20e.
One of the fathers of MeXy the electric MX-5, along with Coulomb and Newton (Jeff Owen).

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coulomb
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Re: MPP 5048MS or 5048MK inverters

Post by coulomb »

rasto wrote:
Wed, 11 Mar 2020, 03:12
Do not you know what kind of firmware are equip nowadays 5048MS inverters?
The 58.4 V Axpert models otherwise equivalent to the PIP-5048MS come with firmware version around 74.40, and the 64 V PIP-5048MS and Axpert MKS models come with around 72.40 (not to be confused with the 72.40 that came with PF0. 8 models in late 2015).

I've been running patched firmware version 74.40e for over a week, and have not noticed any PV dipping or freezing, so hopefully those problems, seemingly prevalent in recent factory firmware, have passed. Though it's been rainy and cloudy here over that time, with only a few stretches of sunny weather, so I can't be totally sure as yet.
Nissan Leaf 2012 with new battery May 2019.
5650 W solar, 2xPIP-4048MS inverters, 16 kWh battery.
1.4 kW solar with 1.2 kW Latronics inverter and FIT.
160 W solar, 2.5 kWh 24 V battery for lights.
Patching PIP-4048/5048 inverter-chargers.

rasto
Noobie
Posts: 5
Joined: Tue, 03 Mar 2020, 01:47
Real Name: Rastislav

Re: MPP 5048MS or 5048MK inverters

Post by rasto »

Ok so far I am decided for 2x5048MS in parallel.
Do not you know if the sellers capacity is not affected by Covid?
Factory firmware units are able go to sleep in parallel or they need to be updated?

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