When adding battery storage to a solar system, the first technical decision is low-voltage (LV) 48V versus high-voltage (HV). Both work well in their intended application. Here is how to decide.

LV 48V batteries (Dyness DL series, Pylontech US series): these operate at 48 to 60V DC and are the standard choice for residential systems. A single 5.12 kWh Dyness DL5.0C costs around Rs. 250,000.

One important specification to understand: the DL5.0C is rated at 0.5C, meaning its maximum continuous output is only 2.2 to 2.5 kW. For a smaller system this is enough for critical load only -- fans, LED lights, phone charging, a router, a small TV. It cannot run a 1.5-ton AC plus other loads simultaneously. One or two DL5.0C units will keep essential things running during loadshedding but will not power your full home.

For bigger residential systems where you want full backup (AC units, pumps, multiple appliances), the right options are:

Dyness PowerBrick 16.07 kWh -- around Rs. 675,000 -- much higher C-rate, serious backup capacity
Pylontech Fidus Plus 16.07 kWh -- around Rs. 700,000 -- excellent BMS communication, very reliable

The LV advantage is simplicity: compatible with almost any hybrid inverter, easy to parallel for more capacity, and lower cost to start.

HV batteries (Dyness Stack series, BYD HVM): these operate at 150 to 500+ volts DC, connecting to the high-voltage port of compatible inverters. Higher voltage means lower current for the same power, which reduces cable losses and enables much higher peak power. HV is the right choice when total storage needed exceeds 20 kWh, for 3-phase systems, and for commercial and industrial BESS applications.

Commercial HV recommendations:

Medium commercial (50 to 300 kWh): Dyness Stack100 or Stack280
Large commercial (300 kWh+): Dyness Stack280

The Stack100 (100 kWh modular) is our most common HV product for commercial sites. These systems cost more per kWh than LV but scale efficiently to very large installations.

Quick decision guide:

System under 10 kW, critical loads only -- 1x Dyness DL5.0C (Rs. 250,000)
Bigger residential, real backup needed -- Dyness PowerBrick (Rs. 675,000) or Pylontech Fidus Plus (Rs. 700,000)
Commercial 15 kW+, or 3-phase, or more than 20 kWh -- HV: Stack100 or Stack280
Industrial BESS above 100 kWh -- HV is the only practical option

Compatibility note: always confirm that your inverter supports your battery's communication protocol. Most Solis, GoodWe, and FoxESS hybrids communicate with Dyness and Pylontech LV batteries via CAN bus. HV batteries require a matching HV-capable inverter model.

Questions about specific inverter and battery combinations? Ask below.