Using an EV for DC to DC charging 48V server rack batteries

[John Kelly]

I made a short video showing the Sterling Power DC to DC 1248120 charger in action. Getting just over 1300W charging to my server rack batteries. I will probably never need this, but if there is ever an extra long outage with crappy solar weather, it might come in handy. This was done with my 10 year old BMW i3 with 110,000 miles on it which only has a 22kWh traction battery. We also have a newer i3 BEV with 44kWh battery so with our 48V batteries we now have about 90kWh of available battery back up.

 

[WorldwideDave]

explain that again - you essentially unplug that anderson connector in the front trunk area and plug into your in-house system to power it? Your victron screen was VRM I think - you have a shunt somewhere tracking the input from the car? When you charge with car you were simultaneously charging from solar, yes?

 

[John Kelly]

explain that again - you essentially unplug that anderson connector in the front trunk area and plug into your in-house system to power it? Your victron screen was VRM I think - you have a shunt somewhere tracking the input from the car? When you charge with car you were simultaneously charging from solar, yes?

Sorry, I got no notification of your response, and just now checked back. Yes, it is going to my 48V Bus Bar and solar is also coming in... there is a Victron shunt. The 48V batteries are connected through the solar inputs of a complete suite of Delta Pros with extra batteries for 220V... a bit of a mish-mash caused by my inexperience when I first started. I would not go with the Delta Pros again although they are performing flawlessly. Too much money just for ease of installation. Live and learn. Thanks for your response.