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Search: Posts Made By: CrankyDoug
Forum: Solar Power 11-24-18, 12:50 PM
Replies: 17
Views: 10,737
Posted By CrankyDoug
Some of the literature I read says IGBT turn-off...

Some of the literature I read says IGBT turn-off time (and thus the frequency) depends on the driver's ability to pull the gate down quickly. This is because of gate-emitter (I think it was the...
Forum: Solar Power 11-24-18, 11:29 AM
Replies: 17
Views: 10,737
Posted By CrankyDoug
Hmm negative thermal coefficient, That probably...

Hmm negative thermal coefficient, That probably explains why IGBT's can be put in parallel without instabilities. This water heater board was designed for two in parallel but they were too close...
Forum: Solar Power 11-23-18, 01:26 PM
Replies: 17
Views: 10,737
Posted By CrankyDoug
Where2 - Thank you for your concern. The...

Where2 - Thank you for your concern.

The manufacturer recommends using the standard 4500W element. This provides optimal power transfer since the circuit does not have a buck/boost stage like a...
Forum: Solar Power 11-22-18, 03:18 PM
Replies: 17
Views: 10,737
Posted By CrankyDoug
Hi Pinball; The controller is still sitting...

Hi Pinball;

The controller is still sitting on my desk. I've got the panels, wire, lightning arrestors, breaker, switches, conduit, etc. Just waiting for a minor health setback to go away so I...
Forum: Solar Power 11-20-18, 02:13 PM
Replies: 17
Views: 10,737
Posted By CrankyDoug
Here is a follow up on the above mentioned...

Here is a follow up on the above mentioned device. First note that I haven't had the chance to test it yet.

It came well packaged but without documentation. I was about to contact the seller...
Forum: Solar Power 10-03-18, 06:34 PM
Replies: 17
Views: 10,737
Posted By CrankyDoug
I found a MPPT water heater control that has been...

I found a MPPT water heater control that has been on the market about five years.

Solar Hybrid Hot Water Solution - No Plumbing Mods Required - At TechLuck (http://www.techluck.com/)

The...
Forum: Solar Power 08-25-18, 09:15 PM
Replies: 17
Views: 10,737
Posted By CrankyDoug
I was involved in the design/build of Chicago's...

I was involved in the design/build of Chicago's 3200 series transit cars which operate on 600VDC. We wanted to redesign a disconnect due to space considerations. GE said sorry, all the engineers...
Forum: Solar Power 08-06-18, 04:22 PM
Replies: 17
Views: 10,737
Posted By CrankyDoug
Switching DC did occur to me as a problem. I got...

Switching DC did occur to me as a problem. I got around this in the past by using substantially oversized force guided contactors according to their de-rating schedule. It may not work in this...
Forum: Solar Power 08-05-18, 12:59 PM
Replies: 17
Views: 10,737
Posted By CrankyDoug
PV direct to water heat

I have an unused area in the middle of my heated basement that should be ideal for four IBC's. I also have a place near the house to put about 3KW in PV. I do not, at present, have the time or money...
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