DeltaPro + External batteries

Hi All,
I'm new to the forum as well as the solar world but done a fair amount of reading.

I purchased a Delta Pro (3600Wh) but want to add 3 - 12V Lifepo 100Ah batteries to my RV to extend the DPro capacity without spending another $2K for their battery. There are 3 recommended options to charge the DPro....
1) AC Charge 120V~ 1,800W Max, (for use with 15A wall outlet) (i currently use this with my inverter generator)
2) Car Charger Supports 12V/24V Battery, default 8A
3) Solar Charger 11-150V 15A Max, 1,600W Max

AC Charge - The cleanest way (albeit most inefficient and expensive) is to tie the batteries into a 200W pure sine wave inverter and plug the AC wall outlet charger into the inverter, but this would mean going through 2 inverters each at say 85% efficiency so the loss would be substantial.
The car charger is only rated at 8A so it would take too long to charge at an 8A rate.
Solar port - I don't currently use solar so can I plug the 2 or 3 additional batteries (in series for 24V, 36V, etc.) into the solar port/MPPT and have the extend the Dpro's 3600Wh capacity. I believe this is ok and would allow me to double the capacity (using 3 -100Ah batteries @36V

Has anyone done this successfully and what would you recommend?
Thanks to all the experts!

DMAXX

I had the same question, and wonder if any adventurous soul as tried or done this?
The DeltaPro is a 48v system you would need 4x12v batteries or 16 raw LiFePo4 cells.
Looking at the cable that connects one DeltaPro to another, there appears to be some communication pins that may cause an issue if there's some type of handshake between systems which would prevent raw power from an external battery being plugged in?

opi said:

I had the same question, and wonder if any adventurous soul as tried or done this?
The DeltaPro is a 48v system you would need 4x12v batteries or 16 raw LiFePo4 cells.
Looking at the cable that connects one DeltaPro to another, there appears to be some communication pins that may cause an issue if there's some type of handshake between systems which would prevent raw power from an external battery being plugged in?

Click to expand...

No, the Delta pro will boost voltage up to what it needs, the input range is 11-150V, so a 12V battery will work. However at 12V input and 15A the charge rate is pretty low. So a higher series voltage would be better, but not required.

Those expansion ports are for either the additional batteries or the ecoflow gas generator (DC output). Nobody has figured out the communications on those ports so they can't be used for diy expansion. Need to use the SCC input.