What is the difference between steered and unsteered roaming for an EV charger?

Steered roaming forces the SIM to try a preferred carrier first —even if its signal is weak at the charger location. Unsteered roaming connects to whichever carrier has the strongest signal. For fixed infrastructure like EV chargers, unsteered is the correct choice: the SIM should prioritize RF reality at the specific installation point, not a commercial agreement made at procurement time.

Does an EV charger SIM need a static IP?

Not for basic OCPP operation —the charger initiates connections to the CPMS, which works through carrier-grade NAT. But if the CPMS needs to reach the charger (remote commands, firmware updates), the charger must be reachable via static private IP and IPsec VPN tunnel. Most managed charger fleets over 50 units deploy private APN with VPN to the CPMS cloud.

Why is SGP.32 eSIM better than a physical SIM for EV chargers?

EV chargers are stationary and have 10+ year deployment lifecycles. During that time, carrier coverage at the site will change, carriers may enter or exit markets, and the operator may want to switch providers. With a physical SIM, any carrier change means a site visit. With SGP.32 eSIM, the new profile is loaded over-the-air through the eIM —no truck roll. For fleets over 100 chargers, this alone justifies the eSIM hardware cost.

Carga EV: 1 de 4 Cargadores Fuera de Servicio

June 3, 2026 · 8 min read · Case Studies

>50% fallos de red. SIM multi-red no dirigida.

La causa #1 de sesiones de carga EV fallidas no es el hardware del cargador — es el fallo de conectividad de red. Mas del 50% de las sesiones fallidas se deben a problemas de red. Aproximadamente 1 de cada 4 cargadores publicos no funciona en un momento dado. La causa raiz: una SIM de red unica instalada en un cargador en una ubicacion donde ese operador especifico tiene cobertura debil o nula.

Roaming Dirigido vs No Dirigido

El roaming dirigido fuerza a la SIM a intentar primero un operador preferido, incluso si su senal es debil. El roaming no dirigido se conecta a la red mas fuerte disponible. Para infraestructura fija como cargadores EV, el roaming no dirigido es el enfoque correcto — la SIM debe priorizar la realidad RF en el punto de instalacion.

SGP.32 Entra en las Especificaciones de Compra de Cargadores

Los cargadores EV tienen ciclos de vida de 10+ anos. Cambiar de operador con una SIM fisica requiere una visita al sitio. Con eSIM SGP.32, el nuevo perfil se carga por el aire a traves del eIM — sin necesidad de desplazamiento.

Carga EV: 1 de 4 Cargadores Fuera de Servicio

Roaming Dirigido vs No Dirigido

SGP.32 Entra en las Especificaciones de Compra de Cargadores

References