{"id":4111,"date":"2026-07-28T11:22:01","date_gmt":"2026-07-28T03:22:01","guid":{"rendered":"https:\/\/www.solidess.com\/?p=4111"},"modified":"2026-10-21T12:03:15","modified_gmt":"2026-10-21T04:03:15","slug":"dimensionnement-des-capteurs-solaires-pour-hopitaux-en-afrique-du-sud","status":"publish","type":"post","link":"https:\/\/www.solidess.com\/fr\/hospital-solar-bess-sizing-south-africa\/","title":{"rendered":"Comment dimensionner un syst\u00e8me solaire + BESS pour les h\u00f4pitaux sud-africains : l'exemple d'une charge critique de 170 kW"},"content":{"rendered":"\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

Size a South African hospital solar and battery system from the circuits it must protect, the interruption each circuit can tolerate, the power needed during the worst event and the energy available until another source recovers.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

Eskom\u2019s July 2026 Mafikeng Provincial Hospital announcement<\/a> describes 200 kW of solar PV, a 400 kWh BESS and a central microgrid controller supporting departments including ICU, theatres and Emergency. It does not publish a 170 kW critical-load figure, a PCS rating, usable AC capacity or the PV AC\/DC rating basis.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

This guide therefore uses 170 kW as an independent, hypothetical protected-load example. The calculations below are teaching assumptions, not measured Mafikeng performance or a MegSolid hospital guarantee.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

Use this design sequence, with the clinical, facilities and appointed electrical teams approving each boundary:<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

Medical load classification \u2192 Simultaneous AC power \u2192 Guaranteed usable AC energy \u2192 Backup duration \u2192 Solar recharge \u2192 Generator coordination<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

The MegSolid hybrid solid-state energy storage portfolio<\/a><\/strong> can support project-specific battery, PCS and microgrid engineering after these operating requirements are defined.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

Start with Medical Load Classification<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

For the illustrative 170 kW load, identify the actual feeders before deciding which must remain energized throughout an outage. A department name alone cannot establish the medical classification or transfer tolerance of every connected circuit.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

Hospital EPCs should divide the critical-load schedule according to clinical consequence and interruption tolerance.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t\t\t
Medical load class<\/th>Typical circuits<\/th>Required design decision<\/th><\/tr><\/thead>
No-break clinical loads<\/td>Selected ICU equipment, theatre circuits, medical controls, emergency lighting and clinical IT<\/td>Can any transfer interruption be accepted?<\/td><\/tr>
Essential support loads<\/td>Selected ventilation, laboratory, pharmaceutical refrigeration, water and communications<\/td>How quickly must the circuit recover?<\/td><\/tr>
Controlled sheddable loads<\/td>Non-immediate support circuits approved by the hospital<\/td>At what SOC may the EMS disconnect them?<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

The exact classification must be approved by the hospital\u2019s clinical, electrical and facilities teams.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

No universal percentage should be assigned to each class without feeder measurements.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

IEC 60364-7-710<\/a> addresses electrical installations in medical locations. The project engineer must establish the applicable South African standards, adopted editions, clinical classifications and local authority requirements; a battery supplier should not assign medical transfer limits from a generic sales article.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"MegSolid\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

Size PCS Power Before Battery Capacity<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t

A 400kWh battery cannot support a hospital if the PCS cannot carry the simultaneous critical load.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

If 170 kW must be supplied simultaneously, a PCS with less than 170 kW of available continuous output cannot carry the protected load alone. The example also assumes 3 kW of auxiliaries: if they use the same PCS output, its active-power duty is at least 173 kW before other allowances. Check available output in the required mode and at site temperature.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t

The EPC must then add project-specific checks for:<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t