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Technical guide

Off-Grid Clinic Power: NEUTRON Protection Scope for Syria Solar Systems

Decentralized off-grid solar brings power to clinics, schools and water points in parts of Syria where the public grid is unavailable. For a health facility the load is unforgiving: a vaccine fridge, lighting and medical devices cannot tolerate a protection fault. NEUTRON supplied the DC protection chain on the array and the residual-current protection on the AC side, while the inverter, battery and modules were integrated by the programme operator.

NEUTRON Engineering TeamUpdated September 16, 20264 min readTechnical application guidance
Modest intact rural clinic with a compact rooftop solar array in a generic Syrian setting
Fig. 0 — Rooftop solar can serve local facilities where reliable access to grid electricity is limited.

Key takeaways

  • With the DC and AC protection coordinated, the clinic systems rode through local faults without losing the cold-chain load to a protection error. The repeatable protection design is the reference template for similar health and education facilities.
  • Treat headline ratings as an engineering input, then confirm the final configuration against the project drawings and applicable local requirements.
  • Keep the approved component list, critical interfaces and required test or document deliverables visible before production begins.

1. Critical off-grid load

A typical clinic solar system must sustain a vaccine cold-chain fridge, consultation lighting and sometimes a water pump. Because the fridge is the life-safety load, the protection design prioritises clean isolation and fast, selective fault clearing.

2. NEUTRON DC protection chain

  • Roof or ground combiner box collecting the strings with individual gPV fuse protection.
  • DC isolation switch for safe maintenance of the array.
  • DC surge protective device matched to the system voltage (IEC 61643-31).
  • Conductor and busbar rating verified for the fused continuous current.
Compact generic PV combiner with an open outer door intact dead-front cover and sealed lower cable entries
Fig. 1 — A compact combiner provides a dedicated location for array-side protection and isolation equipment.

3. AC side: RCCB or RCBO

The inverter output feeds an AC distribution board where NEUTRON installed RCCB or RCBO protection for person shock safety. Where the board also carries the inverter smooth-DC leakage path, a Type B RCBO was selected so the residual-current protection stays effective.

Closed refrigerator and closed AC distribution enclosure in a clean unoccupied clinic utility room
Fig. 2 — Essential refrigeration loads belong in the protection and maintenance plan for off-grid facility power.

4. Coordination with operator-supplied inverter and battery

NEUTRON did not supply the inverter or battery. The protection scope was coordinated to the operator equipment ratings: the combiner and DC fuse limits matched to the array the inverter expects, and the AC board sized to the inverter output and priority loads.

5. Reliability and maintenance

  • Labelled, simple boards so local technicians can isolate and test.
  • RCBO test buttons confirmed during commissioning.
  • Spare gPV fuses stocked locally.
  • Insulation-resistance check before each rainy-season recommissioning.

6. Outcome

With the DC and AC protection coordinated, the clinic systems rode through local faults without losing the cold-chain load to a protection error. The repeatable protection design is the reference template for similar health and education facilities.

Project paths

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Engineering boundary

Final ratings, coordination, installation and applicable local requirements must be verified against current standards, manufacturer documentation and the approved project design.

Frequently asked questions

Why does DC protection matter for clinic solar?

The array can present fault current and smooth DC that AC breakers will not clear correctly; gPV fuses and a DC-rated isolator contain the DC side before the inverter.

What RCD type for medical solar systems?

Where the inverter can inject smooth DC, a Type B RCBO is used so residual-current protection stays effective; otherwise a Type A RCCB is applied per the local wiring rule.

How does NEUTRON coordinate with the operator?

NEUTRON matches the combiner and DC fuse limits to the array the inverter expects and sizes the AC board to the inverter output and priority loads.

Which standards apply?

IEC 60269-6, IEC 61643-31, IEC 60947-2, IEC 61008/61009 and IEC 61439.

Review the essential-load protection boundary.

Share the array, inverter, battery and priority-load inputs for a coordinated off-grid facility review.

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NEUTRON Engineering TeamPower distribution and new-energy equipment for project-based export supply.

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Technical review note

Published from the approved Period 12 source package; project, technical and standards statements are retained from the supplied publication content.