# LEONA-B750K vs LEONA-H135K: choosing between 750 kVA cabinet and 135 kVA wall-mount units Both split hybrid inverters share the same VSG grid-forming core, PQ/VF/droop modes and LEONA-M200K MPPT platform, yet they differ in power class, battery voltage window, isolation and installation. The B750K is a 750/825 kVA IP54 floor cabinet with a built-in Znyn0 transformer; the H135K is a 135/148.5 kVA IP65 wall unit of about 85 kg. Start with the continuous load, the battery cluster voltage and the site lifting conditions. Both split hybrid inverters share the same VSG grid-forming core, PQ/VF/droop modes and LEONA-M200K MPPT platform, yet they differ in power class, battery voltage window, isolation and installation. The B750K is a 750/825 kVA IP54 floor cabinet with a built-in Znyn0 transformer; the H135K is a 135/148.5 kVA IP65 wall unit of about 85 kg. Start with the continuous load, the battery cluster voltage and the site lifting conditions. Rating and overload curve The B750K delivers 750 kVA continuously and 825 kVA peak off-grid with 1194 A maximum output current; the H135K delivers 135 kVA and 148.5 kVA with 216 A. Both publish 1.1x continuous, 1.25x for 60 s and 1.5x for 100 ms overload below 35 C, tolerate 100% three-phase unbalance and keep current THD below 3% above 30% load. Motor starts and welding loads must be checked against the 60 s and 100 ms bands separately, not against the kVA nameplate alone. Battery side and installation The B750K works with a 680-900 V battery window (950 V maximum, 680 V minimum), up to 200 A x 6 channels and one-cluster-one-management control; the H135K accepts 600-950 V and 255 A. The B750K is a 1200 x 2018 x 1227 mm, roughly 2700 kg IP54 forced-air cabinet needing a plinth and lifting gear. The H135K is a 770 x 970 x 362 mm, roughly 85 kg IP65 wall unit that installs without heavy equipment. Both are rated -30 to 60 C with derating above 45 C, and 4000 m altitude with derating above 2000 m. Isolation and transfer time The B750K integrates a Znyn0 isolation transformer that improves safety on poor site earthing, reaches 97.8% peak efficiency and transfers in under 20 ms. The H135K has no built-in transformer, reaches 98.1%, transfers in under 10 ms and extends to online-UPS, missing-phase and weak-grid applications. Choose the B750K where a separate neutral, galvanic isolation or legacy distribution retrofit is required; choose the H135K for lightweight rapid deployment and 10 ms transfer. Several B750K units can also form a 2.25 MW microgrid through communication-free VSG paralleling. Frequently asked questions Can both models be mixed in one project? On the grid side yes, but a single droop/VSG parameter set must establish the off-grid voltage. Align the battery window, EMS point-table revision and paralleling strategy, then validate in a factory test. Why is the B750K slightly less efficient? The built-in transformer adds copper and iron losses in exchange for an independent neutral, earthing tolerance and higher surge withstand. It is a topology trade-off, not a control generation gap. Related equipment and guides [SP750H54PSTD](/en/product/sp750h54pstd-2) · [SP135HAPSS](/en/product/sp135hapss) · [SP125HCPS](/en/product/sp125hcps) · [SP200/150HAPV](/en/product/sp200-150hapv) · [All technical guides](/en/blog/category/blog) · [Product catalogue](/en/products)。 ## Can both models be mixed in one project? On the grid side yes, but a single droop/VSG parameter set must establish the off-grid voltage. Align the battery window, EMS point-table revision and paralleling strategy, then validate in a factory test. ## Why is the B750K slightly less efficient? The built-in transformer adds copper and iron losses in exchange for an independent neutral, earthing tolerance and higher surge withstand. It is a topology trade-off, not a control generation gap.