I took a look on PlugShare and the EA chargers in Castro Valley sure look like BTCPower chargers to me. I also looked at the EVgo in Castro Valley as well and they don't look like the EVgo chargers I been to. I searched high and low in my area at all the EVgo chargers trying to find any that didn't use the BTCPower chargers but so far no luck. Around here they all use the same model.
I have a 2014 Spark EV. I only get 14 kW or 15 kW charging at all the BTCPower chargers no matter who owns them. I have tried them at Electrify America, EVgo and CalTrans both 40 kW and 150 kW chargers. The ABB chargers at Electrify America I had connection problems until I modified my charging port as described here https://sparkev.blogspot.com/2015/09/so ... e.html?m=1
I been to the Electrify America station that has ABB chargers twice now trying two different chargers after the modification and both worked on the first try and charged me at 51 kW.
I had heard that you can get a communications error if you swipe the app too soon to initialize charging. They said after plugging in your car wait till the screen on the charger comes up with the instructions to pay with your credit card then swipe initialize on your app. So I tried to make it fail by swiping the app as soon as it I could. The screen on the charger was still in the communication phase and hadn't gotten to the credit card part. It didn't cause an error and the charge went normally and charged my car at 51 kW rate. Only other thing I can think of is I did have my blue tooth turned off on my phone. I had heard that can help if you turn it off.
I stopped at a ChargePoint to see if I can charge at 50 kW or if they too would limit my charge to 14 kW. I had trouble with the app trying to setup my payment and the ChargePoint charger didn't accept credit cards. So I had to give up and go home.
So far it looks like a BTCPower software issue. Perhaps the 2014 Spark EV needs an update in its firmware or BTCPower needs to update their software to make sure it is backwards compatible with older EVs. This will be an issue charging companies will have to face more and more as the years go on.