Sigineer 15kW 48v Inverter for Tesla Battery Modules
THE MOST POWERFUL 48Vdc INVERTER IN THE WORLD. Battery powered off-grid systems are quite popular and 48Vdc is the current voltage of preference. Unfortunately, most 48Vdc inverters are simply a poor match for Tesla Battery Modules. Why? The main problem is the Low Voltage Cutoff - the point of battery discharge where the inverter will shut down to protect the battery. Almost all 48Vdc inverters have LVCO in the 42-44V range with a very very few able to handle batteries down to 40V. Two Tesla Battery Modules in series are pretty much discharged at 38V, but they are only 50% discharged at 43.2V. And so with almost all inverters on the market you are leaving 30-50% of your battery capacity on the table. That means you have to purchase TWICE the battery capacity that you would need if the inverter simply operated down to the 38V cutoff. The other issue is that many of these inverters will also charge your batteries from AC - the charger is built in. That's great, but they are traditionally designed for lead acid batteries. They may support a bewildering array of Pb chemistry types, but ALL of the charge curves they provide are deadly to Tesla Battery Modules. We advocate charging with a simple bulk current to 50.5 volts and NO MORE. Almost all inverters want to charge to something more like 56 volts with equalization phases as high as 60V. This will immediately DESTROY your Tesla Battery Module, not over time but the FIRST time it does so. And of course most 48Vdc inverters provide 4KW to 8KW of power max. We have located an excellent quality 15 kilowatt inverter made in China that can do 45KW for 20 seconds. It charges at 110 Amperes from 240Vac. And we have commissioned them to provide a Low Voltage Cutoff of 38Vdc and a charge limit of 50.5Vdc - ideally tuned for the Tesla Battery Modules. With the 15kW model, we introduce a set of FREQUENCY SHIFT contacts. When used with our ESP32 Battery Module Controller, this lets you easily turn off grid tied inverters used to backcharge your batteries through the inverter when the battery gets full."