VarioString VS 70/120 — high-voltage MPPT charge controllers 48 V
Country: Switzerland · Model: VarioString VS 70 / VS 120
VarioString high-voltage MPPT charge controllers at 70 and 120 A for 48 V batteries, with PV input up to 600 V, or 900 V on the VS 120. They suit sites where the array sits far from the battery room and long strings on thin cable pay off.
- Models
- VS 70, VS 120
- Charge current
- 70 A (VS 70), 120 A (VS 120)
- PV power
- 4200 W (VS 70), up to 7000 W (VS 120)
- PV voltage (Voc)
- 600 V; VS 120 — 900 V with 2 inputs in series
Technical specifications
| Models | VS 70, VS 120 |
|---|---|
| Charge current | 70 A (VS 70), 120 A (VS 120) |
| PV power | 4200 W (VS 70), up to 7000 W (VS 120) |
| PV voltage (Voc) | 600 V; VS 120 — 900 V with 2 inputs in series |
| Battery voltage | 48 V DC (38–68 V) |
| Efficiency | > 98 %, MPPT > 99.8 % |
| Galvanic isolation | yes |
| Protection rating | IP54 (VS 70), IP20 (VS 120) |
| Customs codes (for reference) | |
| HS code | 8504.40 |
| UKTZED code (Ukraine) | 8504405500 |
| CN code (EU) | 85044060 |
Specifications are taken from the manufacturer’s technical documentation. Updated . Customs codes are for reference only; the final code is determined at customs declaration for the specific model.
Description
Galvanic isolation separates the PV input from the battery, so strings of several hundred volts are not tied to the 48 V bus or system ground. The VS 70 takes 4200 W and charges at 70 A, the VS 120 takes up to 7000 W and delivers 120 A. The larger model has two inputs, and wiring them in series raises Voc to 900 V. The battery window is 38–68 V. Conversion efficiency exceeds 98 %, MPPT tracking exceeds 99.8 %. Up to 15 units run in parallel, letting one battery collect power from several arrays. The VS 70 housing is IP54 and copes with a dusty room, while the VS 120 is IP20 and needs a dry location.
How to choose
Pick the model by array power, 4200 W for the VS 70 and 7000 W for the VS 120, then check cold-weather string Voc against 600 or 900 V. If panels sit next to the battery and strings are short, a VarioTrack with a 145–175 V input will do. A next3 system rarely needs a separate controller, since the inverter has two MPPT inputs of 8 kW.
Request a price and lead time
VarioString VS 70/120 — high-voltage MPPT charge controllers 48 V. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What is the maximum PV voltage of the VarioString VS 120?
Each input is rated 600 V Voc. With its two inputs in series the VS 120 accepts a string of up to 900 V.
Why does a charge controller need galvanic isolation?
It separates the high-voltage array from the 48 V bus, so an insulation fault on the roof does not put hazardous voltage on the battery and loads.
How many VarioString units can run in parallel?
Up to 15 units on one 48 V battery, the array power being the sum of all controllers.
What is the efficiency of the VarioString?
Conversion efficiency is above 98 % and maximum power point tracking accuracy is above 99.8 %.
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