Sol-Ark has discarded traditional design methodologies of DC- and AC-coupled battery systems and reduced the cost [over 25%] by combining all of the electronics into a single DC transformerless system in its 8K solar inverter. The transformers are needed for power conversion and 120/240-V split phase in/out, but are massive, expensive and create wasted energy. Eliminating transformers allows achieving a 96.5% efficiency, while using low-cost 48-V external batteries. Several expensive 380-V battery solutions claim high efficiency but fail to include the 380-V conversion losses to 50V in the battery.
Battery grid-tied designs can provide continuous power for selling back to the grid, but these sacrifice peak power for starting motors off grid. Peak power is why traditional DC-coupled inverters continue to dominate off-grid applications. Even though the Sol-Ark 8K has good continuous grid-tie power, engineers doubled the components for excellent peak power off grid to 20-kW. The 20-kW peak power improves long-term reliability and cooling of the system.
For customers living off grid, Solar-Ark incorporated programmable loads for running A/C and hot water on solar power instead of batteries (adding years to their lifespan). One of the single biggest issue with living off grid is knowing how much battery capacity you have left. so Solar-Ark incorporated a proprietary battery learning algorithm that accounts for aging batteries.
The inverter also includes a color touchscreen display and remote monitoring. Sol-Ark 8K was designed to be the easiest battery solar install ever, so even customers could installed themselves if they desired.
The Sol-Ark 8K is also reliant against EMP, solar flare and cyber-attacks. Independent government labs hit Sol-Ark 8K ~140 times at twice the military levels (100 KV/m) without damage to the inverter, appliances or panels. The inverter can also be updated remotely.
News item from Solar-Ark