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Mini Solar Charger System to just Charge my Tesla S75D
- Thread starter Joshib
- Start date
A 2 to 2.5 kW solar setup would work, depending on what you assume for average daily hours of useable sun. We average 4.5 hours here (average over the whole year). Do you want it to continue working on the shortest day of winter, or just an average day?
30 miles range is about 10 KWh. One powerwall is 13.5 KWh nominal. Should need just one powerwall to store that much energy.
30 miles range is about 10 KWh. One powerwall is 13.5 KWh nominal. Should need just one powerwall to store that much energy.
robby
Member
What is your goal in storing the energy yourself? It will likely be much cheaper to net meter, and it will also give you unlimited storage capacity in the grid rather than constraining you to a fixed size battery.
eye.surgeon
Active Member
robby
Member
This is true but for OP's reference, PA is among the states that require appointed utilities to allow net metering.
Hmm. The DSIRE website says this:
"It is important to note that electric generation suppliers (EGSs) in Pennsylvania are permitted but not required to offer net metering."
That was from 2017, so maybe it has changed.
robby
Member
My understanding is that ESGs are alternative suppliers you can opt into buying from. The next sentence gets at this ("Thus, customers who choose an electricity supplier other than their utility or Default Service Provider (DSP) must check with the supplier to see if it offers net metering service.") I think what they're saying is that appointed utilities must offer net metering, but if you make special arrangements with a third party provider, then net metering availability is between you and that third party.
ai4px
Wes
Net metering is the key here... think the electrical grid as a big battery that you can push power into and get power of out. In my area, they keep a running balance of the excess on my account month by month and square up with me if there's excess at the end of each annum at wholesale rate for electric. Other regions however meter power such that what you put into the grid is credited to you at wholesale (4c/kwh typical) and *always* bill you at retail for power coming into you meter. This is common in Australia and probably in many places in the USA. Heck, my power company even keeps track of on/off peak for the power I sell them... not sure why, they'll give me the wholesale rate at the end of the year anyway.
Without net metering the problem you'll have is that you need a way to store the power. How many kwh do you use to drive each day? You'll need a little more storage than that because unless you work nighshift, the solar system isnt making power when you are at home at night. SolarEdge makes an inverter called StorEdge that works with LG Chem 10kwh batteries. I've heard you can parallel two of them for 20kwh, not sure if you can parallel more. Never the less the StorEdge inverter is capped at 7.6kw. Given you probably get 5 hours a day, that's 38kwh potential... so a StorEdge with 4 LG Chem batteries would charge your car 1/2 way.
Without net metering the problem you'll have is that you need a way to store the power. How many kwh do you use to drive each day? You'll need a little more storage than that because unless you work nighshift, the solar system isnt making power when you are at home at night. SolarEdge makes an inverter called StorEdge that works with LG Chem 10kwh batteries. I've heard you can parallel two of them for 20kwh, not sure if you can parallel more. Never the less the StorEdge inverter is capped at 7.6kw. Given you probably get 5 hours a day, that's 38kwh potential... so a StorEdge with 4 LG Chem batteries would charge your car 1/2 way.
AndreSF
Member
Not positive what the motivation here is... Cost savings? Your commute costs you around $1 - $1.3 in electricity per day. Makes little sense from cost-saving perspective IF system used only going to cover your charging needs. Having PV and PowerWall combo is more about self-powering your electrical needs IMO, while still using grid's elasticity as needed. And the obvious benefits of having a very capable Uninterruptable Power Supply (UPS) for the house.
robby
Member
gavine
Petrol Head turned EV Enthusiast
AndreSF
Member
Hmm, sure, I read that, but the primary listed OP goal was to cover 20 - 30 mile commute needs and backup was the secondary.
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