All SILENT YACHTS are powered by two Torqeedo electric 30-250kW engines which are powered by battery bank which, in its turn, can be charged by solar panels. So it's worse to talk about batteries.
Going ahead, SILENT YACHTS catamarans are equipped with 120-240 kWh (28-56 module) MG Li-Ion HE battery bank with lithium rich NMC (Nickel Manganese Cobalt) cathodes, but let´s see why.
There are several types of batteries in the market today: Lead Acid (including GEL, AGM), Nickel Cadmium, Nickel Metal Hydride (Ni MH) and Lithium-Ion (Li-Ion).
The first two types have very low Specific Energy (kWh/kg), 2-3 times less then Li-Ion, in other words, battery bank will be too heavy to give you some reasonable sailing autonomy, although AGM batteries are very popular in conventional sailing and powerboats where electricity consumption is relatively small.
Nickel Metal Hydride batteries were really used in a famous GM EV1 electric car in 1996, and it gave a car significant autonomy of 280km. These batteries had a lot of advantages, they were more stable, a battery management system is simple, they also had a very high specific power (W/kg) what should give acceleration and engine pull-down, but battery bank was still heavy and today Li-Ion batteries are used in a large majority of electric vehicles.
So Li-Ion batteries were chosen to have a light battery bank with a lot of energy, specifically, SILENT 55 has a 120kWh battery bank which weighs just 800kg.
There are also several types of Li-ion batteries, depending mostly on a cathode material and electrolyte (Li-Polymer). Li-Ion NMC batteries together with NCA (Nicol Cobalt Aluminium) have the best Specific Energy, but NMC even more stable and thus safe. This is why SILENT YACHTS power its catamarans with Li-Ion NMC bank.
Silent Yachts battery supplier MG ENERGY SYSTEMS is officially one of the most innovative companies in the Netherland which also won a month ago the Gamechangers Innovation Award, ex Northern Innovation Award. Congratulations guys, good job!
So, to sum up, the formula is simple
More Energy + Less weight + Safety = SILENT YACHTS