MikeDabrowski2017
Posts: 51
Joined: Sat Aug 19, 2017 1:25 am
Location: North East Ct
Contact: Website

Re: Of grid solar charging

Tue Nov 14, 2017 4:20 pm

Happy to see I’m not alone in feeling that the huge 60kwh battery in the Bolt may make a great place to dump excess solar production.
We are going through a spell of weather that
Is mostly cloudy so my 7500w solar array is struggling to keep my 48kwh lead acid storagebank filled
Each day so EV charging is not on the table right now
I can switch to grid supplied power any time and have been using the grid to charge the Bolt .

I have been collecting plug in hybrid battery packs from Ford energi plug in vehicles
The packs use lithium Nickle manganese cobalt oxide NMG type chemistry and the cells are 27 AH
Each rack of 21 batteries can be reconfigured as 1
567AH cell by putting the cells in parallel
Have 16 racks to make a 48V battery
To add to my lead acid solar storage bank.
Hope to get this additional 27kwh of storage on line
soon and hopefully some sunny days to charge it all up
At that point I should be able to charge the Bolt off stored solar energy and still run the house and shop
Off grid.
Too many projects not enough time.

GetOffYourGas
Posts: 1076
Joined: Tue Oct 20, 2015 5:25 pm
Location: Syracuse, NY

Re: Of grid solar charging

Tue Nov 14, 2017 7:54 pm

MikeDabrowski2017 wrote:Too many projects not enough time.


I feel this way simply keeping up a 60-year-old house. I envy the time (and skill!) you have to undertake those projects. Before I traded in my Leaf, I toyed with the idea of keeping it and playing around with the battery. But in the end I decided not to.

Keep pushing the envelope!
~Brian

EV Fleet:
2011 Torqeedo Travel 1003 electric outboard on a 22' sailboat
2012 Leaf SV (traded for Bolt)
2015 C-Max Energi (302A package)
2017 Bolt Premier

Marktm
Posts: 5
Joined: Wed Nov 22, 2017 3:15 pm

Re: Of grid solar charging

Wed Nov 22, 2017 3:43 pm

MikeDabrowski2017 wrote:Happy to see I’m not alone in feeling that the huge 60kwh battery in the Bolt may make a great place to dump excess solar production.
We are going through a spell of weather that

Hope to get this additional 27kwh of storage on line
soon and hopefully some sunny days to charge it all up
At that point I should be able to charge the Bolt off stored solar energy and still run the house and shop
Off grid.
Too many projects not enough time.


My 2012 Leaf is set up to direct solar charge (off-grid) with this setup:
1. OpenEVSE (OE) charge controller that accepts simple commands to adjust the amperes.
2 Arduino controller that sends these simple commands based on solar energy production.
3. Sensor monitors the amperes out of my Midnite 250KS CC into my 48 VDC FLA battery pack that is used to calculate the solar energy to the battery system. Sensor Also monitors the battery pack voltage to cut off the OE to prevent too low SOC on the battery pack.
4. Sensor information is used by the arduino to send required ampere setting to OE to "match" (open loop) solar energy going to battery pack.
5. Goal is to maintain 90% plus SOC in battery pack - and keep them in MPPT mode. I can quickly "float" at end of run.
6. I use an 48 VDC based APC UPS for the inverter that outputs 208 VAC to the OE, maybe not the best, but cheap and works great.
6. This installation is in a rural environment that does not have a "sustainable" internet (have to hot spot to get any and SLOW), so limited options on getting solar data => system must be stand-alone

Eventual goal is to purchase a new/used Bolt and use bi-directional CCS/PLC based protocols to drive-in, hook up the CCS and charge/discharge the Bolt's energy for off-grid, emergency use. Why? - the OE level II system is very inefficient - and admittedly a kludge.

I am very interested in information on off-grid solar charging, especially at the 400 VDC bus level. Also,of course interested in any information about GM's CCS protocols that could allow bi-directional energy along a 400 VDC bus :idea: .

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