Pylontech advice

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BouwerD

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Hi All,
I would really appreciate some advice please. Currently got a 48V off-grid solar installation on a farm with:

Omnipower HT-B-S8000-48 8KW Pure Sine Wave Inverter
Outback FLEXmax 80 Charge Controller
24 x 2V First National solar lead-acid batteries (+-1100Ah at C10)
12 x JA Solar 335W panels (+-4KW)

Problem is that the lead-acid batteries has reached its end of life and we need to replace them. Option is to replace with the same 24 x 2V First National solar lead-acid batteries. Looking at +-R120k which seems to be very expensive for old technology.

Better option might be a bank of 4xPylontech US3000 (3.5KWh)

Problem is the Inverter and charge controller we have is older generation and probably more suited for lead acid type batteries. So we need to understand if the inverter and charge controller will be compatible with the Pylontech batteries, and if we will get the same capacity. I also do not know how to compare the options as far as amp hours / capacity is concerned.

Questions:
Is the calculation correct that the 24 x 2V First National solar lead-acid batteries is +-13kwh based on +-25% discharge (1100 * 0.25 * 48) compared to 4 x Pylontech US3000 that will be +- 14Kwh (not sure what is the relevance or comparative C rating on Pylontech)?
Can I use the Pylontech batteries as a drop in replacement for the current lead-acid batteries.
 
It should work as long as you can set the charge parameters according to the Pylontech specs, they have a built in battery management system and should be able to manage themselves.

1100Ah at 48V gives you a massive 52.8kWh, at 50% DOD its 26.4kWh, so that's what you are aiming for with lithium. Are you sure you are calculating them correctly? Is one 2V cell 1100Ah?
 
Last edited:
thechamp said:
It should work as long as you can set the charge parameters according to the Pylontech specs, they have a built in battery management system and should be able to manage themselves.

1100Ah at 48V gives you a massive 52.8kWh, at 50% DOD its 26.4kWh, so that's what you are aiming for with lithium. Are you sure you are calculating them correctly? Is one 2V cell 1100Ah?
Click to expand...
He's working in 25% DOD for the lead acid.
 
5 x US3000 pylontechs will give you 14kw @ 80% DOD which would be in the R120k range.
 
Could most probably give in old cells for scrap could cover some of expenses.
 
thechamp said:
It should work as long as you can set the charge parameters according to the Pylontech specs, they have a built in battery management system and should be able to manage themselves.

1100Ah at 48V gives you a massive 52.8kWh, at 50% DOD its 26.4kWh, so that's what you are aiming for with lithium. Are you sure you are calculating them correctly? Is one 2V cell 1100Ah?
Click to expand...
Yes according to:
Will get 5000 cycles at 25% DOD. At 50% its about half of that, which I assume is still about a lifetime of 7 years
 
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