EV Charging with Solar Panels

http://www.mynissanleaf.com/viewtopic.php?t=23203

Thanks Solar, I will read it.

Did that before and found out that a lot of ??? (B.S.) is in there.

Charging the Leaf to go first to the 12 Volts battery and from there with an inverter to the charger with 120 or 240 Volts? That is a way to go to Rome too?

Tks

The solar strings I have installed are 19 X 20 = 380 Volts DC (max. 398 V)

With enough sunshine they deliver 8 amps X 2 ( 2 strings)= 16 amps.

The battery is 24 kWh. An exceptional sunny summer day delivers 32 kWh out of the panels.

The Nissan has a quick charge plug that can charge the battery from about 10% to 80% in 30 minutes. Charging currents in these chargers can be as high as 50 Amps.

The monitor in the Leaf shows the charging level and has a 80% limit possibility.

I was supplying power (grid tie) to the grid and my bills were negative for 3 consecutive months. (meter reading was every time lower than the month before)

The grid is bad here. Today my inverter was only on for 20 minutes in total, because the grid was far out of specs, (goes in safe mode)

I consider feeding nothing back anymore since they don't pay my production and have no problem selling my 1000 kWh a month for 22 cents plus 11 cents fuel charge for fuel they never bought. (per kWh)

I have been looking for a AC coupled system with backup batteries.

The battery part was $10,000.00 for a LiFePO4 @48 volts and 10.2 kWh.The Leaf (second hand) was much cheaper and had 24 kWh - 10% left. (18,000 km), but the battery is 392 Volts - not so common for feed back into the house.

1. However a full V2H (vehicle to house) is already available for the leaf. (Nissan V2H)

(costs $14,000 and not in the US yet - only Japan -100-200VAC)

2. Setec (Chinese) has a inverter for the leaf @ 6 kW to 240 V/60 Hz, that plugs straight in the leaf and feeds the house. With the solar panels directly to this plug (the fast load) I can manage the house and use the grid as pilot.

And if the grid quality doesn't comply soon, I replace the pilot with a victron- fronius- netmeter- color box to have all the sunshine in the car/house.

If I need more battery, I will drive the leaf once in a while.

This operation starts in 60 days. Will keep you all informed.

OK, I think I understand what you want to do, use a Nissan Leaf for battery storage for your solar to power your house.

A possible problem that I see is that the CHAdeMO quick charge (30 min) system has feedback to the charger from the car that controls charging current. The Leaf tells the charger via the CAN bus when the 80 percent charge is reached and also prevents excess charging current (probably via temperature sensors). Improperly charging Li-Ion batteries can cause battery damage and possible fire.

CHAdeMO charging socket (left) on an all-electric Nissan Leaf. An SAE J1772 socket (IEC 62196 type 1) is also shown on the right.

"In addition to carrying power, the connector also makes a data connection using the CAN bus protocol.^[9] This performs functions such as a safety interlock to avoid energizing the connector before it is safe (similar to SAE J1772), transmitting battery parameters to the charging station including when to stop charging (top battery percentage, usually 80%), target voltage, and total battery capacity, and while charging how the station should vary its output current.^[10]"

https://en.wikipedia.org/wiki/CHAdeMO

I would think that the best idea is to drive a 240 VAC inverter with the DC from your solar panels and charge the Leaf through the Level 2 system during the daytime. .

I will look into that too.

AC inverters mostly work from 12,24,48 and maybe also a few from 96 Volts. This implicates a next battery and MPPT charger, different from the 392 Volts that I have available.

I have found a good workshop manual and check on this. I also have seen fast charger systems with solar but they are pricey. ($40,000.00 plus)

A next Nissan battery is hard to get, unless I return the old one ( $5,600.00) and a used one on ebay is 3000 to 4000 dollar and most are 8 years old or older.

Spending your time on this is much appreciated. It feels good that you are thinking with me. Thank you.

D.