brightk:
dat mercury is over priced

Mavor:
Not off grid. And I said for budgetary reasons meaning na there my power reach financially.

jonescosmos:


Oh, great, then you can ignore the extra Panels and MPPT CC as suggested, your are good to go with your plan, But your AC will be your ENEMY is this setup. You must find a way to time it to work only during PEAK SUN HOURS and when Grid is available or better still, replace the AC with the new models LG Dual Inverter 1.5hp (GEN COOL B) you will be glad you did.

isangjohnson:

Sorry to say this, you may not get a good 12v hybrid inverter with Mppt at a lower price but you can find it easily with pwm cc.
Even at 180k, a 1kw to 1.5kw 12v hybrid inverter with Mppt cc and 40a pv charging amps may still be lacking other vital things like flexible battery parameters settings and may also have a very serious issue with float bulk, which you may end up buying an external cc.
A Chinese told me that what we pay for is what we get. Lol

Mavor:
But the AC I am referring to is an LG Dual Inverter.

jonescosmos:


Confirm if your indoor unit has this kind of display when you put it on inverter mode. Notice the Battery Logo under the 0.6KW digit written "INVERTER" inside of it.

The difference is, this model retains it's memory of the inverter mode setting when you switch it off and on from either switch or remote controller. Another difference is you can be chilling @16 degrees with less than 600w power. My 1.5hp takes between 620w and 480w @16 degrees in inverter mode. I learnt this applies to this NEW GEN COOL B Models (GEN COOL + by LG).
I have attached their model stickers for reference.

olopan:
The GUI of these BMS with parameters display is quite easy to understand and yet detailed.

Mavor:
I don't know much about SRNE inverters. Is it a good product please?

Oshomo12:


Yes, Icell-power 2.5kva, transformer based, fangpusung mppt controller etc

Mavor:
Thanks. A lot of things to consider. First, don't know if my landlord will allow up to 20 solar panels on the roof. He will allow 10 for sure but 20 is a lot. Second is also the financial factor. But your proposed design makes a lot of sense to me.

NiyiOmoIyunade:
I read later where you said your cells are well balanced.

Two possibilites;

Either your BMS parameters were set too conservative for the charge parameters you want to use OR your cells exhibit a larger voltage drift than you have noted under charge or discharge with high currents.

Do you have access to your BMS protection parameters and can you publish/screenshot them here?

When the BMS cuts off charge/discharge, what error message is logged?

In any case you want far more conservative charge settings on your inverter 55.4v absorb and 53.6v float.

The above settings are 3.46v per cell and 3.35v per cell for absorb and float respectively - at a 3.35v per cell float you can be sure no extra current is making it into the cell and no possibility of overcharging it even over the long run.

Observe the battery pack voltage delta (mV difference between highest and lowest cell as well as highest cell voltage) when the inverter is in absorb and also whatever error message is logged when the BMS cuts off power - these will clue you in what is going on and where to direct your efforts.

Ferdiwar:
In this case why not go for a higher wattage of panels to be able max out your roof space and at the same time maximize your yield.

1st decide on the inverter you want, then confirm its parameters matches with your proposed system design.

Ferdiwar:
SRNE is good (have not personally used one) based on my research when I wanted to get mine.

It was my 2nd option then behind Growatt. If you're in Lagos try and go to their office and buy it to avoid stories or order directly from them if you're outside Lagos.

Valto:
24v 105ah 2662kwh available 560k - 620k.

mctfopt:


How does that work?

jonescosmos:


Confirm if your indoor unit has this kind of display when you put it on inverter mode. Notice the Battery Logo under the 0.6KW digit written "INVERTER" inside of it.

The difference is, this model retains it's memory of the inverter mode setting when you switch it off and on from either switch or remote controller. Another difference is you can be chilling @16 degrees with less than 600w power. My 1.5hp takes between 620w and 480w @16 degrees in inverter mode.
Note the 484-492w on the Smart Load port. This because one of my 1.5hp is presently turned on.

I learnt this applies to this NEW GEN COOL B Models (GEN COOL + by LG).
I have attached their model stickers for reference.

Mavor:
I believe mine is the same. What inverter system do you use that gives you that load visualization?

Mavor:
Please can someone give me the price for this setup, i want to compare and know if I am being cheated. Thanks.

5kva SRNE inverter with 5.12kwh LiFePo4 battery and 10 panels x 550w.

Mavor:
I believe mine is the same. What inverter system do you use that gives you that load visualization?

HeavenlyBang:
What are the best value for money hybrid inverter makers on the market?

I've seen models from Powmr and Easun, are they solid? What about Sunmate?

Or would I be better served just going with a standalone unit?

jonescosmos:


Oh, nice. But just for confirmation sakes, use energy meter and check your inverter consumption at different stages. Also check if it retains the inverter mode after unexpected power of.
I don't think they're the same according to the model numbers on our labels. But if it behaves alike, then you are good to go.
My inverter is Deye