Off-grid

RiiO II inverter charger

The RiiO Sun II without the built-in solar charger: a transformer-based inverter charger for backup and off-grid systems, from 1kVA to 8kVA.

RiiO II is the sister model of the RiiO Sun II: the same transformer-based inverter charger, without the MPPT solar charge controller built in. It suits backup power systems, and off-grid systems where solar is handled by a separate controller or an existing grid-tie inverter.

Models

RiiO II 1KVA-L	12V, 1kVA
RiiO II 1.5KVA-M	24V, 1.5kVA
RiiO II 2KVA-M	24V, 2kVA
RiiO II 3KVA-M	24V, 3kVA
RiiO II 2KVA-S to 8KVA-S	48V, 2, 3, 4, 5, 6 and 8kVA

Features

Transformer-based, with high surge power for heavy loads.
Switches to battery in 4ms during an outage.
Smart port on the 5, 6 and 8kVA models for a generator input or second AC output.
Auto generator start, power control and power assist, and ECO mode to stretch backup time.
Pairs with a separate solar charge controller, such as the SP600 or SP900, or with AC-coupled solar.
Monitor locally with the E4, or remotely through NOVA.

Where to buy

Compare 48V models

Model	Continuous	Peak	AC charger	Transfer switch	Smart port	Weight	Dimensions
2KVA-S	2000VA	4000W	20A	20A	—	13kg	462 × 255 × 144mm
3KVA-S	3000VA	6000W	35A	32A	—	17kg	499 × 272 × 144mm
4KVA-S	4000VA	8000W	50A	32A	—	19kg	499 × 272 × 144mm
5KVA-S	5000VA	10000W	60A	50A	50A	27kg	570 × 310 × 154mm
6KVA-S	6000VA	12000W	70A	50A	50A	29kg	570 × 310 × 154mm
8KVA-S	8000VA	16000W	90A	50A	50A	32kg	620 × 320 × 164mm

Specifications

Figures for the RiiO II models (TBB 2025 catalogue)

Inverter
Battery voltage	12V (1KVA-L), 24V (-M models) or 48V (-S models)
AC output	220/230/240V ±2%, 50/60Hz
Surge	300%
Efficiency	Up to 95% (48V models)
Transfer time	4ms (under 15ms in weak-supply mode)
AC input	175–265V, 45–65Hz

Charger
Absorption / float (48V)	57.6V / 55.2V
Battery types	AGM, GEL, OPzV, lead-carbon, flooded, traction, lithium

General
Parallel and three-phase	Up to 12 units, 96kVA
Communication	RS485; Bluetooth setup through the NOVA app
Programmable relay	1 (30V DC/3A or 250V AC/3A)
Operating temperature	−20°C to 65°C
Protection rating	IP21
Standards	EN-IEC 62477-1, 62109-1, 62109-2