Hi Michael, I’m building a similar system. I’ve already ordered 20 272Ah cells from Michael Caro. They should be in soon and am now researching the components I need to support it. At the moment I haven’t ordered anything. Your post introduced me to DSSR20 and SBMS0. Does the DSSR20 replace a MPPT controller and the SBMS0 replace a regular BMS? If this is a basic question, please excuse the ignorance. I’m a DIY’r in the deep end of the pool on this stuff.
yes, the Electrodacus DSSR20 replaces the MPPT essentially if you have 60 cell or 72 cell solar panels to match up with it. the Electrodacus SBMS0 can control an MPPT but I chose to go with the Electrodacus SBMS0 with Electrodacus DSSR20 both made By Electrodacus out of Canada. Dacian at Electrodacus will quickly respond to your questions.
it takes 1 Electrodacus DSSR20 for every 2 solar panels in series. The Electrodacus DSSR20 is a solid-state relay and will easily outlive any MPPT as there is no electrolytic capacitor to break down. The SBMS0 is essentially a computer controller that monitors the LIFEPO4 battery banks but will only do up to 8S configuration (24-volt - a safe voltage for the DIYer). The Electrodacus SBMS0 can control up to 18,000 watts of solar panels. and it can also divert excess solar electricity into heat for your house. I bought 4 of the Electrodacus DSSR20's with diversion to try out the heating, but have not got to that part yet.
I bought 16 Electrodacus DSSR20's without diversion to control 40 used 250watt 60 cell solar panels and to specifically charge the LiFePo4 battery banks. (10000 wats of solar panels). I have 32 Lishen 272Ah cells and will soon be getting 32 more so in the more final phase I will have 64 272Ah Lishen cells in 4 separate 24-volt banks.
The Electrodacus SBMS0 balances your cells as it charges - it is phenomenal and it shows the voltage in 3 decimal places for each of the 8 battery cells. You can combine cells in parallel as I did 2P8S for a 24-volt battery bank. It works great.
I have seen a guy who did 3P8S but I chose to go 2P8S for the battery configuration.
I think you could do 4P8S without any problems as many people already do this.
I am not an electric expert but a DIY type person who studies a lot before doing it.
you will want to get a bench type charger to initially charge your cells in parallel to bring your voltage up before assembling your battery bank.
I bought a Riden 6012-W -- it works great and also does the 3 decimal point accuracy. I just received the newer Riden 6018-W for more power.
I think the Electrodacus SBMS0 is the way to go. the battery protection and monitoring is second to none for the price. the Electrodacus SBMS0 with wifi is what I bought so I will be able to see it all on a bigger screen.
I am working to add panels slow but sure in pairs. I was reinforcing the solar panel array yesterday in the snow for solar panels to be mounted.
You might look at Electrodacus.com for a bit more information.
I bought pre-made parallel cables with MC4 ends for easy plug and play.
I am making the rest of the cables myself with crimpers and such and wire bought in bulk off the internet.
yes, the SBMS0 replaces a regular BMS. it far exceeds most all BMS capabilities for a small price.
my DIY solar panel array is treated 2x6 lumber and unistrut to mount the solar panels to. I have a south-facing solar array and presently working on a west-facing solar array.
I use 10AWG PV wire from the solar panels into the Electrodacus DSSR20's and onto the bus bars. the Electrodacus SBMS0 is connected with small control wires. I used 22 gauge solid strand cat 5 cables with twisted pairs.
I used an 18 gauge wire solid strand to connect the Electrodacus DSSR20's in parallel.
The Electrodacus SBMS0 controls them. SBMS0 = solar battery management system. the 0 just means model number.
DSSR20 = digital solid state relay. I am not sure but I believe the 20 means it can control 20 amps of solar panels.