The charging port is the i5's most handled part
The SAGMOTO i5 is a pure-electric light truck with a 120 kW PMSM motor and an LFP battery of 98 or 131 kWh at a nominal 345.6 V. It charges through a combined AC and DC inlet that drivers plug and unplug several times a day, in depots, on curbs and at public stations — in rain, dust and tropical heat. That inlet and its cable are the most mechanically handled components on the truck, and they are also the highest-voltage interface a workshop will touch. This guide covers the i5 AC and DC charging inlet (CCS2 and GB/T connector care), contactor and pilot-pin checks, insulation resistance testing, water and dust ingress reality, dielectric grease, cable storage and strain relief, how to tell charger-side from vehicle-side faults, DC fast-charge derating in 45 °C ambient, the battery cooling interaction, lock actuator failure, the safety isolation required before any port work, and the parts and tools to stock plus a monthly 15-minute inspection checklist.
Unlike a diesel fill, the i5 charging event is a controlled high-voltage handshake. The vehicle and the charger negotiate before current flows, and the inlet carries both the power pins and the control pins that manage that handshake. Damage to either side stops the charge or, worse, lets moisture into a live cavity. The discipline here is about keeping those cavities clean, dry and torqued.
AC and DC inlet: CCS2 and GB/T care
The i5 inlet supports DC fast charging on the CCS2 format and AC charging through the same housing; export builds to GB/T markets use the GB/T connector profile. The DC contacts are larger and recessed, the AC pins are lighter, and the control (pilot) pins are the small ones that manage the session. After every charge, the connector should release cleanly; if it resists, do not yank — inspect the latch and the cavities. Wipe the inlet face with a dry, lint-free cloth; never spray cleaner into the pins. Keep the protective cap on the inlet whenever the truck is not charging, because the cap is what keeps the IP rating intact between sessions.
| Connector | i5 use | Max rate | Care point |
|---|---|---|---|
| CCS2 DC | Fast charge, 20 to 80% | 60 kW | Recessed DC contacts, keep dry |
| Type 2 AC | Depot overnight | 22 kW 3-phase | Pilot pin cleanliness |
| GB/T (market) | DC or AC by region | Per spec | Latched seal, no forced fit |
Contactor and pilot-pin checks
Inside the i5 charging path sit the main contactors — high-voltage relays that connect the battery to the inlet only after the handshake completes. A contactor that welds shut or fails to close is a fault the truck reports as a charging error. The pilot pins carry the low-voltage signal that tells the charger the connection is safe; corrosion or a bent pin there blocks the session before any power moves. Check the pins for discoloration (a sign of arcing), the contacts for pitting, and the connector latch for positive engagement. These are diagnosis points; contactor replacement is a high-voltage job and must follow the isolation procedure below.
Insulation resistance testing
Because the i5 runs at 345.6 V nominal, the charging circuit must be tested for insulation to chassis. Use a 500 V or 1000 V megohmmeter (megger) set to the SAGMOTO specification, with the battery isolated, and measure resistance from each power line to the chassis ground. A reading below the threshold (typically a few hundred kilo-ohms and falling toward zero) means moisture, cracked insulation or a failing component in the charging path and the truck must not be charged until found. Record the reading at each service so a slowly dropping trend is caught before it becomes a fault.
| Test | Condition | Acceptable | Action if fail |
|---|---|---|---|
| Insulation to chassis | Battery isolated, dry | > 500 kΩ at 500 V | Locate leak, do not charge |
| DC contact resistance | Clean, torqued | < 0.5 mΩ per pin | Clean or replace contact |
| Pilot continuity | Connected | Continuous, no open | Straighten or replace pin |
Water, dust and the IP rating in the real world
The i5 inlet carries an IP rating that holds against rain and brief immersion in the lab, but the rating assumes the cap is fitted and the connector is latched. In the field, a missing cap, a cracked seal or a connector forced in wet lets water track into the cavity, and dust packs the recess like it packs a radiator fin. The IP rating is a design target, not a permit to jet-wash the port. After rain or dust exposure, dry the inlet face and confirm the cap seals before the next charge. Dielectric grease on the seal face (not in the power contacts) helps shed water on site-duty trucks.
Cable storage and strain relief
The charge cable is heavy and the i5 inlet is mounted at bumper height, so the cable hangs from the port every session. Strain at the inlet shoulder is the most common cause of a cracked housing. Coil the cable on its holder when not in use, never kink it, and keep it off the ground where vehicles and forklifts can run over it. A cable with a damaged outer jacket must be retired — the inner conductors and the control wires are exposed to exactly the moisture and abrasion the jacket exists to block.
Charger-side versus vehicle-side faults
Half of "i5 won't charge" calls are the charger, not the truck. Tell them apart with a simple sequence: try a second known-good charger or a second vehicle on the same charger. If the fault follows the charger, it is charger-side (a failed DC supply, a stuck contactor in the unit, or a pilot fault in its cable). If the fault follows the i5, it is vehicle-side (inlet, contactor, pilot pin or battery management lockout). The i5 dashboard and the charger display usually name the cause — a "pilot error" is almost always the connector or cable, while a "battery fault" or "isolation fault" points to the vehicle.
| Symptom | Likely side | Confirm by |
|---|---|---|
| Won't start on one charger only | Charger | Try a second charger |
| Won't start on any charger | Vehicle | Check inlet, pilot, isolation |
| Starts then stops at low power | Vehicle cooling / temp | Read battery temp fault |
| Connector won't latch | Vehicle lock actuator | Listen for lock motor |
DC fast-charge derating in 45 °C ambient
The i5 battery runs liquid cooling with PTC heating and is rated to 55 °C ambient, but DC fast charging at 60 kW dumps heat faster than the pack can reject in hot weather. Above about 45 °C ambient the battery management system derates the charge current to protect cell life — the i5 charges slower, not because it is broken, but because the cooling cannot keep pace. This is normal and expected; forcing a faster rate by ignoring the limit shortens the 3,500-cycle cell life. In hot markets, prefer cooler-hour charging or AC depot charging overnight, where the heat load is lower and the pack stays in its best temperature window.
Battery cooling interaction
The charging current and the cooling system are linked. During DC fast charge the i5 pre-conditions and circulates coolant through the pack; if the cooling loop is low or the pump is weak, the pack temperature climbs and the charger derates harder. Treat the traction cooling loop as part of charging health: keep coolant at level, and if fast-charge speed falls off in moderate weather, check the pack cooling before the inlet. The i5's LFP chemistry is tolerant, but no cell likes sustained high temperature under high current.
Lock actuator failure
The i5 locks the connector in place with a small actuator so it cannot be pulled under load. A failed actuator either refuses to lock (the charge will not start, or starts and the connector is loose) or refuses to release (the driver cannot unplug). Listen for the lock motor when plugging in; no click means the actuator or its supply has failed. A connector that will not release is a trapped-cable hazard — isolate the vehicle and release manually per the service procedure rather than forcing the cable, which damages the latch and the pin.
Safety isolation before any port work
Any work inside the i5 charging path is high-voltage work. Before removing the inlet, the contactor cover or the cable, pull the service disconnect, wait the specified time for the HV bus to discharge, and confirm zero volts with a calibrated meter at the test points. Wear rated gloves and use insulated tools. Never bridge the contactor, never probe live, and never assume the pack is safe because the truck is off — the LFP pack holds 345.6 V and a dangerous current long after the key is out. This is the one job on the i5 where a shortcut injures, not just delays.
Parts and tools to stock
| Item | Quantity per 10 i5 | Why |
|---|---|---|
| Charging inlet assembly | 1 | Cracked housing stops the truck |
| Connector / cable (DC) | 1 | Jacket damage retires a cable |
| Lock actuator | 2 | Common, cheap, fast fit |
| Dielectric grease | 1 tube | Seal care on site duty |
| Inlet cap | 5 | Lost caps invite ingress |
| Megger + HV meter | 1 set | Insulation and zero-volt check |
Monthly 15-minute inspection checklist
Run this on every i5 once a month, or after any severe-weather exposure:
- Visual: inlet face clean, no moisture, no cracked housing, cap present and sealing.
- Pins: DC and AC contacts bright, pilot pins straight, no discoloration or arcing marks.
- Latch: connector locks and releases with a clear click; no binding.
- Cable: jacket intact, coiled on holder, no kinks, off the floor.
- Seal: dielectric grease on seal face, no dust packed in the recess.
- Readout: last charge session shows no pilot or isolation fault logged.
- Safety: service-disconnect label legible, gloves and meter present in the bay.
The SAGMOTO new energy electric trucks range shares this charging architecture, so the inspection routine and the parts list transfer across an i5 and i-series electric fleet. Shaanxi Fenghan Trading supplies genuine SAGMOTO inlets, cables, lock actuators and the insulation test tools, all matched to the 345.6 V LFP system, so a port fault stays a same-day repair rather than a stranded electric truck.