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MPPT Generation and Actuall Charging


JJS
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Hi Guys,

I have only been running for a week +- that being said all credit must go to @Gerlach he has helped me tremendously over whatsapp where all 5 attempts I made to get an installer backfired.

Anyhow, I would like opinions and your personal experiences.

In short, what I am seeing my solar MPPT is generating does not go into the battery bank,  I must generate double Kwh on the MPPT to be able to charge the battery to 100% again, where is the rest going.  There is no voltage drop between the MPPT and the battery terminals, running 25mm cable between the 60Amp MPPT and battery.

Example would be today, I used 5.68Kwh (3.22 battery and 2.46 inverter) and generated 10+- Kwh, at 15:30 battery was full at last.

I understand there must be some losses somewhere but 50% +,  is that normal ? What are you guys seeing on your setups?

 

Thanks !!

 

Edit - Need to buy a clamp meter and the BMS is not stating its limiting charge current.

 

 

 

Edited by JJS
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2 minutes ago, francois said:

Hi JJS what inverter do you have? 

Are you not perhaps exporting to the grid or to the non essential loads?

Hi Francois,

Its a 5kw Microcare.

I have eliminated the inverter by switching it off completely and pulled the DC breaker letting eskom power the house and MPPT only charging the battery.

If I may ask, how does your solar generation compare to amps going into the battery ?

 

 

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2 minutes ago, JJS said:

Hi Francois,

Its a 5kw Microcare.

I have eliminated the inverter by switching it off completely and pulled the DC breaker letting eskom power the house and MPPT only charging the battery.

If I may ask, how does your solar generation compare to amps going into the battery ?

 

 

I also have some losses but nothing like what you are experiencing.

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14 hours ago, JJS said:

I understand there must be some losses somewhere but 50% +,  is that normal ? What are you guys seeing on your setups?

How do you have the panels wired? All series/parallel etc.?

I’m assuming the inverter has its own built in MPPT?

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@JJS glad i can help. 

@jykenmynie it's a Micorcare system. 5kw inverter with 60a Microcare MPPT with 16s2p Lifepo4 setup with Smart Ant BMS. With this Mppts you run 3s3p setup because the max 150v and max 3000w. Nothing wrong with his array. It makes helse lot of power, more then me in winter and mine is close to his size of array, his roof angle is just rite. 

Problem is, the mppt generates close to avg of 13 to 15kwh/24h, but there is a lost somewhere because it doesn't calculate/add up correctly the ah that go's in to the battery "the bms got it's own shunt setup that can show that info", and the power the house use. We pick up that the Mppt DC side of the battery shows different volt on the display and if you put a multi meter on it shows +- 0.3 / 0.4 difference on the mppt. Same with my 2 mppt's . The Setsolar "Microcare" shows 0.3v difference to my new Microcare 60 mppt. With my setup there is a bit of lost to but not like his.

We think somewhere is a lost in the cable setup between the mppt and batteries or the MPPT is massive out with kwh calculation.  

Edited by Gerlach
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