Schneider Conext SW 4048

The budget Schneider, and it predates lithium the same way the OutBack Radian does. Modbus only and no BMS port, so every protection limit is a setting you enter and then own.

Published figures

Continuous output

3,400 W

Surge output

6,800 W

Battery voltage window

44 to 64 V

Max charge current

105 A

Battery comms

Modbus

Output

120/240 V split phase

Grid interactive

Yes

PV input

External charge controller

What this inverter will and will not do

• It works alongside the utility, which means an interconnection agreement, a permit, and an inspection in most jurisdictions. Budget months, not weeks, for that process.
• Output is 120/240 V split phase from one box, so standard household 240 V loads run directly.
• Battery communication runs over Modbus, and closed loop still depends on both sides agreeing on a message format rather than only on a bus standard.
• No solar charge controller is built in. A working system needs a separate MPPT, which is cost and cabinet space that is easy to leave out of a first budget.

Sizing a battery bank for it

This inverter delivers up to 105 amps of charge current, and that figure, not your daily energy use, sets the minimum pack count. Every battery below is shown at the smallest bank that can absorb the full charge rate.

Fuse and cable for the battery run

Running flat out this inverter pulls about 71 amps at 48 volts, and a surge takes it to roughly 142 amps. Size the protection for the peak, not the average: a 100 amp Class T fuse at the battery positive terminal and 2 AWG cable on the battery run. Class T rather than a standard fuse because a 48 volt lithium bank can deliver enough short circuit current to arc across a fuse that lacks the interrupt rating. Confirm the sizing against your installation manual, which accounts for run length and ambient temperature.

Communication

No manufacturer document tracked here names a specific battery for closed-loop operation with this inverter.

Where the figures come from

Schneider has no public document library this site has been able to verify. Every figure on this page therefore needs checking against the paperwork that shipped with your unit.

Questions people actually ask

Worth reading before you install

• How many batteries this inverter actually needs
• Split phase or single phase, and what it costs to get wrong
• Off grid or hybrid, and what each one will not do
• Cable sizing for the battery run