“Heiwit S.p.A. is an Italian company specialising in sodium-ion energy storage systems and hybrid inverters for photovoltaics, based in Varese. It sells exclusively through the Heiwit installer network.”
“The three models differ in terms of rated output power (6, 10 and 12 kW), maximum power (6.6, 11 and 13.2 kVA) and maximum output current (10, 16 and 20 A). They all support up to 18 kW of photovoltaic power across 3 MPPT channels and the same Heiwit sodium-ion batteries.”
“Up to 6 Heiwit sodium-ion batteries in parallel, 3 on each of the 2 battery inputs (30–60 V range, 125 A per input), for 60 kWh of storage.”
“Yes. The switchover time to backup mode is less than 10 ms, and the inverter can handle peaks of up to 20 kVA for 10 seconds.”
“The protection rating is IP65 and the operating temperature ranges from −25 °C to +60 °C, with a reduction in power output above 45 °C. Cooling is provided by an intelligent ventilation system, with a noise level of less than 45 dB(A).”
“The 3K-S delivers 3 kW output, the 4K6-S 4.6 kW and the 6K-S 6 kW. The permitted solar PV input is 8 kW on the 3K-S and 9 kW on the other two, always across 2 MPPTs. All three use the same 48 V Heiwit batteries and charge or discharge at up to 5 kW.”
“From one to three 10 kWh Heiwit sodium-ion batteries. This is the configuration set out in the system's TÜV SÜD conformity document.”
“Yes. The system comprising the Virgo inverter and battery holds CEI 0-21 certification issued by TÜV SÜD on the basis of type tests, document no. D 132944 0003 of 17 October 2025.”
“Yes. The 3K-S to 6K-S models hold TÜV SÜD certificates to VDE-AR-N 4105:2018: generating unit ESY 132944 0008 and network and system protection NS ESY 132944 0009, both dated 14 September 2026.”
2023-10-04
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