So Love'd your Garage door springs heating element arrangement for braking……
Me too. So Chris, I was looking at this a bit closer. My original load bank was looking to be 3.4 ohms per phase (2 - 6.8 ohm in parallel), 6 resistors total.
(2 in II, 6.8 ohms)
Vline Vph R, ohms I watts (tot)watts (per resistor)
80 46.2 3.4 13.58 1,882 314
90 52.0 3.4 15.28 2,382 397
100 57.7 3.4 16.98 2,941 490
110 63.5 3.4 18.68 3,559 593
120 69.3 3.4 20.38 4,235 706
130 75.1 3.4 22.08 4,970 828
140 80.8 3.4 23.77 5,765 961
150 86.6 3.4 25.47 6,617 1,103
But, they're pricey buggers (~$120/ea). I've been watching for something on e-bay, but hard to find the right qty, resistance & ratings. At 3.7 ohms (higher with temp noted), it might be a good fit.
A few questions:
1) I assume you are meaning the normal residential style springs as apposed to the torsion wound found on larger doors?
2) You stretch them a bit to separate the coils?
3) How did you make terminal connections?
BTW I owe you a thanks on describing the PV High function for the Classic Aux. I had been using Waste Not for diversion (preheating dhw), but found when there was sun, and the wind was fluctuating it wasn't triggering soon enough. With PV High I can catch any voltage increase above my preset, and tell it when to turn off. the PV generally is handling the battery needs. Slick. I'm still playing with the settings (currently I'm on at ~75 or 80V and off maybe 65V), but it is working much better.
Regards, ~ks