growatt and Tesla?

I Have a question for the Forum, Can you level 2 charge a Tesla model Y directly from a 5k 48v Growatt inverter with a Eg4 battery and solar panels?

Sure, you can charge your Tesla at 5kw. For how long? depends on how many panels and batteries you have.

Black night said:

I Have a question for the Forum, Can you level 2 charge a Tesla model Y directly from a 5k 48v Growatt inverter with a Eg4 battery and solar panels?

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Sure you can, at a lower L2 output with only a 5kW system. By far the best way to do it would be to charge it while PV is active. If you wanted to charge at night, it would take a lot of $1800 EG4 5kWh batteries to store all the energy needed to fully recharge what your Tesla can store (75kWh?)!!!

Also remember due to the inefficiencies to charging the EG4(s), and only being able to use about 80% of their capacity, you're only going to get <4kWh out of each EG4 battery assuming you put 5kWh into it... So if you wanted to fully recharge a 75kWh Tesla battery from empty with EG4's at night, you'd need around 20 EG4 batteries (around $36,000 just in batteries!) and need close to 100kWh of solar production! Even if you only wanted to recharge 1/2 your Tesla battery, you're still looking at 1/2 of those numbers!

Basically the only reasonable way to do it is charge it during the day while PV is active, or have two EV's and do the same and drive the other during the day.

Black night said:

I Have a question for the Forum, Can you level 2 charge a Tesla model Y directly from a 5k 48v Growatt inverter with a Eg4 battery and solar panels?

Click to expand...

I don’t know which all in one Will Prowse used, he has videos on this. I think he commented that charging may need to be throttled back to 25 amps At 240 volts. A 5 k inverter would be running at 4800 watts at 20 amps and 240 volts, and pulling about 5.6 kw from the panels or batteries.

Based off 16 kwh of production on an ideal day from my 2.5 kw array in my local area, to do 240 volts and 20 amps, i would want 15 kw of panels with 5 kw pointing east, 5 kw pointing south, and 5 kw pointing west to do 20 amp charging for up to 8 hours a day. Pointing the panels this way will not maximise total watts produce, but could extend your solar prouction by two to three hours, really cutting in on the total batteries needed. If each kwh gets you 3 miles, than this may get you 120 miles charging during this 8 hour period.

A few assumptions on that. If the weather went bad, that may deplete the battery pack quickly. Those numbers are for April, and I think my December production would be 1/3 less and Summer solstice could be 1/3 more.

I’m trying to figure out how much charging my system could do on Level 1 should I get an EV. With a 15 amp 120 volt plug running at 12 amps for 7 hours, I should be able to charge 10 kwh, or 30 - 40 miles with 3 or 4 kwh of power for my other needs. That is with a 13 kwh battery pack, 2.5 kw of panels, and a 3 kw inverter. So, I need to do the majority of my charging in the day. 900 watts of those panels are ground portable, and those would be moved three times through the the day.

You'd be pushing the inverter to the max. An 8KW would do a much better job or two 5KW paired for 10 KW total. You'd need alot of battery and solar pannels 50 KW - 100 KW to finsh the charge. Charging happens at a little over 5K continual.