Gaining understanding7 Dec 2019 21:23
Of what challenges are ahead for ev charging is all new for me. I naively thought it was a case of just wiring up to the mains. I heard royal mail mentioned in the interview on you tube which made me listen more as I’m a postman. Doing abit of research I found this article helpful for better understanding to what is needed to charge a fleet of Ev’s
Use Case 2: Return to Depot and Public Charging
Organisations such as Royal Mail operate depots, where substantial numbers of vehicles are co-located on a single site. Without smart charging, 100 EVs could represent an increase of load of 0.7MW per site, assuming that fast chargers of 7kW are deployed on a one to one ratio of charger to EV. For the entire Royal Mail fleet, this would represent a maximum load of approximately 320MW across the UK – approximately 0.5% of the UK’s peak demand for this fleet alone. If depot operators were to implement rapid (50kW) charging the impact on the network could be substantially higher.
Similar to depots, public charging points will increasingly be co-located, for example, in electrified ‘filling stations’ (as can be seen in announcements of Shell and BP9 investing in EV charging capabilities). The higher power chargers found at these sites, such as rapid DC, will place substantially higher loads on the network. As with the home charging case, this presents three key challenges to the network:
• A section of the block of reinforcement cost is borne by the depot or charge point operator. However, a portion may be socialised, resulting in higher costs for customers. Additionally, charging can result in high peak loads, which reduce the efficient use of network capacity, further increasing costs.
• The substantial network reinforcement that is likely to be required could result in long waiting times for connections, which will slow the rollout of commercial EVs. Similar to the return to home charging use case, the amount and value of flexibility and smart charging from commercial EVs is currently unquantified.
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