Charge controller + relay for dumping into heating elements

[ClassicCrazy]

It will take some good design if you want to be able to switch the PV input from one controller to another.
If you are talking about switching high DC voltages then it gets more complicated in a way .
That is why I have been using the IGBT block since it can switch those high DC voltages.
I think maybe  you should watch this guys video's in link below  and perhaps contact him. He has some ideas on how to divert power from input I believe.
Let me know what you find out from him.
https://www.youtube.com/channel/UCgjG28Ml0hEO_jueEKEjdAg/videos

Larry

[moosemaster]

Thanks Larry - do you control the IGBT with the thermostat controller you have?

These look like they might do the job for switching DC - just trying to get a price - https://ep-fr.mersen.com/en/products/engineering/hybrid-dc-power-relay

"Xs-EV features a DC power relay that can repetitively clear up to 2kA at 1,000 VDC. Xs-EV has been engineered to provide high DC switching performances versus conventional mechanical DC power relay, switch and contactor. This power relay is a hybrid technology with the capability of switching both high voltage and high current designed specially for electrical vehicle applications."

Will try and wrap my head around opera's videos, a bit beyond my technological grasp but there seems to be some good nuggets of information.

Sean

[ClassicCrazy]

Thanks Larry - do you control the IGBT with the thermostat controller you have?

These look like they might do the job for switching DC - just trying to get a price - https://ep-fr.mersen.com/en/products/engineering/hybrid-dc-power-relay

"Xs-EV features a DC power relay that can repetitively clear up to 2kA at 1,000 VDC. Xs-EV has been engineered to provide high DC switching performances versus conventional mechanical DC power relay, switch and contactor. This power relay is a hybrid technology with the capability of switching both high voltage and high current designed specially for electrical vehicle applications."

Will try and wrap my head around opera's videos, a bit beyond my technological grasp but there seems to be some good nuggets of information.

Sean

There was a guy selling the igbt blocks on ebay for real good price - but he might be sold out. I paid $20 to 30 for the ones I have . Seems like everyone else sells them for twice as much.
I am no expert on all these things. I had someone help me a bit , and the one I have installed has been working for what I am doing with it.
There are lots of IGBT blocks for sale on ebay but I forget which specs you need to look for to make sure you get one that works.
I made a couple videos of my exploring those IGBT  details for reference.
Not sure if you saw those or not.
http://midniteftp.com/forum/index.php?topic=5064.15

Larry