I have a Smartsolar 75/15 and have acquired some new (old stock) 9S 3Ah li-ion batteries by Bosch, so charge voltage about 37.8v, nominal 32.4/33.3v. I don't think manual settings cover these values so what do I need? Do I have to buy a different solar charger? Pv panels are 3 x 100Wp in series for about 56 - 60v out. This is for a small solar boat which previously had lead batteries. I've a feeling that I bought the wrong batteries.
The 75/15 is only for 12V and 24V so it can't reach the voltages you need.
You have to buy a MPPT 100/20_48V.
Thank you Matthias. I understand that the latest 48v solar chargers have a 36v setting. Does this mean that manual settings in that range will cover 9S? I can't work it out from looking at the Victron website.
PARTIAL SOLUTION I found and read the online manual for my Smartsolar device. There is a LIFEPO4 option which I selected, then changed the parameters to suit a 7 series li-ion battery, so I will rewire each pack to 7S leaving two cells redundant in each pack as a temporary solution.
