Tesla Motors Club
I am about to buy a Model S - I have a number of queries on charging that I have really struggled to find the answers to.
Background
We run a set of holiday cottages that are heated with night storage heaters, and so have a decent supply. We have two phases (like 3-phase but someone ran off with the third phase). So it effectively operates as two single phase supplies, although has a 3-phase meter. We can pull 90kW at night in winter, roughly 45kW per phase which at 230V is 196A *2. Having a 3-phase upgrade is £35,000 to the transformer, and figure £5-10k internal costs to run cable to transformer (400m), and associated amendments to frig things about in electric intake room - not happening. Elec load tails off about 4am, and we won't touch 30% of peak for rest of day. We also have 10kW of PV panels and 8kW of inverters on each phase. So we can have nearly 8kW spare per phase in summer depending on what pool is doing. Transformer and cables good for 120kW.
Questions
I need to block charging between 00:00 & 04:00 otherwise I exceed Available Capacity charge and get penalised by supplier. Can this be done in the car or ideally the charger (I can do it easily with time clock and relay)
A Zappi is on the shortlist so I can use excess PV in the summer. We often export 6kW for 8-hours during the day in summer, and often work from home, free sounds good.
Can I run dual chargers with two phases, 32A per phase (or more) for 04:00-07:00 would give me plenty of charge at £0.07/kWh (£10k elec bill). Is this two cables running to the car or one? The other option is to allow charging beyond 07:00 but that costs £0.12/kWh
Could I run dual Zappis to charge from PV on each Phase. The available PV load will differ between phases.
All charge points likely to be available to guests, although we have only had 1 EV here ever, quite a few hybrids, but this will change. Costs of installation or duplication of kit aren't my priority.
You can guess why I have struggled to find out this info! Can anyone help on any points.
Dave
Background
We run a set of holiday cottages that are heated with night storage heaters, and so have a decent supply. We have two phases (like 3-phase but someone ran off with the third phase). So it effectively operates as two single phase supplies, although has a 3-phase meter. We can pull 90kW at night in winter, roughly 45kW per phase which at 230V is 196A *2. Having a 3-phase upgrade is £35,000 to the transformer, and figure £5-10k internal costs to run cable to transformer (400m), and associated amendments to frig things about in electric intake room - not happening. Elec load tails off about 4am, and we won't touch 30% of peak for rest of day. We also have 10kW of PV panels and 8kW of inverters on each phase. So we can have nearly 8kW spare per phase in summer depending on what pool is doing. Transformer and cables good for 120kW.
Questions
I need to block charging between 00:00 & 04:00 otherwise I exceed Available Capacity charge and get penalised by supplier. Can this be done in the car or ideally the charger (I can do it easily with time clock and relay)
A Zappi is on the shortlist so I can use excess PV in the summer. We often export 6kW for 8-hours during the day in summer, and often work from home, free sounds good.
Can I run dual chargers with two phases, 32A per phase (or more) for 04:00-07:00 would give me plenty of charge at £0.07/kWh (£10k elec bill). Is this two cables running to the car or one? The other option is to allow charging beyond 07:00 but that costs £0.12/kWh
Could I run dual Zappis to charge from PV on each Phase. The available PV load will differ between phases.
All charge points likely to be available to guests, although we have only had 1 EV here ever, quite a few hybrids, but this will change. Costs of installation or duplication of kit aren't my priority.
You can guess why I have struggled to find out this info! Can anyone help on any points.
Dave