Increase Home Charging speed with battery?

slacker775

Active Member
Joined
May 30, 2018
Messages
196
Location
Florida
Tesla Owner
Model 3
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Country
#1
Now that I've entered the world of wireless phone charging and have my Nomad charger in my M3, I started thinking - could it be possible to increase home charging speeds if the wall charger could get extra juice from a local battery. In my home situation, I'm limited to 30A charging due to the fairly low capacity of my main feed. Yeah, I know I could probably bump it to 50A or 60A and try to juggle appliance usage to avoid tripping the main breaker but I have a life and don't want to be worrying about crap like that.

Seeing how something like the Nomad has a local battery to be able to do higher power charging, could a similar setup w/ a wall charger allow a base feed of something like 20-30A to put out something more like 50-60A? Maybe even bump up to 80A or so, depending on circumstances? I use the home charger only every couple days so a battery would have lots of time to recharge between usage.

Pipe dream? Perhaps possible? Would cost too much to be worthwhile?
 

jsmay311

Well-Known Member
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Oct 2, 2017
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378
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Chicago Suburbs
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#2
Perhaps possible? Would cost too much to be worthwhile?
Perhaps. And yes (IMO).

Even if such a product existed, the money would be better spent upgrading your electrical service. And spending significant $ to charge any faster than 30A is overrated, IMO. On a 30A circuit (assuming that's what you mean), the Model 3 charges at 22mph. A 12 hour charge overnight at 22mph is 264 miles -- almost a full charge. The max with the UMC is 30mph -- not that much higher. And installing a HPWC would cost even more.
 
Last edited:

Ed Woodrick

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May 25, 2018
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667
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Atlanta, GA
Tesla Owner
Model 3
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#3
Now that I've entered the world of wireless phone charging and have my Nomad charger in my M3, I started thinking - could it be possible to increase home charging speeds if the wall charger could get extra juice from a local battery. In my home situation, I'm limited to 30A charging due to the fairly low capacity of my main feed. Yeah, I know I could probably bump it to 50A or 60A and try to juggle appliance usage to avoid tripping the main breaker but I have a life and don't want to be worrying about crap like that.

Seeing how something like the Nomad has a local battery to be able to do higher power charging, could a similar setup w/ a wall charger allow a base feed of something like 20-30A to put out something more like 50-60A? Maybe even bump up to 80A or so, depending on circumstances? I use the home charger only every couple days so a battery would have lots of time to recharge between usage.

Pipe dream? Perhaps possible? Would cost too much to be worthwhile?
Yea, it's not really a big problem. First you've got to get a battery big enough to charge a LR Battery from a specific state of charge. That may suggest either 1.5 or 2 times the battery size. That's probably $15k - $20k. You've then got to get an inverter that can charge it. That can vary, depending on how fast you want to charge it, but let's pull a number out of the hat, $2k. And then you've got to get a high current AC inverter to get to 90A, I'm going to guess maybe $10k. I may be well low in all the numbers.

APC makes a UPS that supports this amount, but their prices are all "Contact Sales"

It may be cheaper to buy another Model 3.