Good Sam Club Open Roads Forum: Break-even point between cable length and voltage drop?
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 > Break-even point between cable length and voltage drop?

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profdant139

Southern California

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Posted: 04/07/22 12:21pm Link  |  Quote  |  Print  |  Notify Moderator

Very clever -- just bypass the controller and use another controller near the battery! I'm not sure I will do that -- depends on the cost and my lack of skill -- but that is definitely thinking outside the box.

It's interesting (in a 30,000 foot way) to see myself as a captive of my own assumptions, for example: "Well, the controller is permanently attached, so I guess I am stuck with it."

It is very hard to force myself to think in a non-linear way: what if we ignore the existing controller?? Once someone else points out the obvious alternative (usually DW), I feel humbled. It is not a pleasant sensation.


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pianotuna

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Posted: 04/07/22 04:06pm Link  |  Quote  |  Print  |  Notify Moderator

Munches on humble pie on sometimes a daily basis!


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

profdant139

Southern California

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Posted: 04/07/22 04:23pm Link  |  Quote  |  Print  |  Notify Moderator

The only thing worse than humble pie is when it comes with a side order of crow. Don't ask how I learned this.

SteveAE

Bend, Oregon

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Posted: 04/08/22 07:32am Link  |  Quote  |  Print  |  Notify Moderator

Short of modifying your existing system (or better yet, building your own system that will better work for you....panels and a controller are super cheap these days), I like the idea of having two different length cables that you can mix and match as needed. Just keep in mind that every time you have a connection point there is an increase in resistance.....and a corresponding voltage drop.

But, keeping with my theme of looking for alternative solutions (I guess they call it thinking outside the box) here are some more (dumb???) ideas:
- Get a second portable system that you put in parallel with your existing system and double the fun of chasing the sun around.
- Have a second battery that you put right by your panel, then swap batteries as needed. If you can't bring Mohammad to the mountain, then move the mountain to Mohammad...or some such nonsense.
- Put another cable in parallel with your existing cable.

BFL13

Victoria, BC

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Posted: 04/08/22 09:28am Link  |  Quote  |  Print  |  Notify Moderator

Once in the sun all day worth rotating tilted array three times.
Sunset to SE
Mid morning to S
Mid afternoon to SW

Also tilt lower mid day with sun higher

Eg 130W in May at 49N daily AH haul

Flat 56
South tilted all day 70
Tilted rotate three times 90

OP 110AH batt 50% needs 55 plus 5 for heat so
60 is in range after using some to run things during daylight too and 120W other times of year and latitudes

* This post was edited 04/08/22 09:38am by BFL13 *


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