โJan-30-2015 08:58 AM
โMar-12-2015 03:28 PM
โMar-09-2015 10:19 PM
โMar-09-2015 09:51 PM
jrnymn7 wrote:
Electrical Conductivity Payment Conversion Calculator
โJan-31-2015 06:06 PM
โJan-30-2015 08:25 PM
smkettner wrote:BFL13 wrote:pianotuna wrote:
53 watt panel
PT, those guys are as bad at math as your are! ๐ The USA NEC says you need a 20% margin but these guys say you should multiply by 1.25 for controller size in amps. That is a 25% margin.
Hint for the "math disadvantaged"--
- 25 expected amps. 20% is 5 amps so you need a 30 amp controller.
1.25 x 25 = 31.25 (6.25 more not the NEC required 5 more.)
NEC says 20% margin on the wire/equip for continuous duty (3+ hours).
30 amp x 20 % = 6 amp derate or 24 amps. Or as they suggest 1.25% of the 24 amps.... wait for it..... 30 amps.
So the 1.25 is same as NEC 20% because they are going in opposite directions.
โJan-30-2015 07:41 PM
BFL13 wrote:pianotuna wrote:
53 watt panel
PT, those guys are as bad at math as your are! ๐ The USA NEC says you need a 20% margin but these guys say you should multiply by 1.25 for controller size in amps. That is a 25% margin.
Hint for the "math disadvantaged"--
- 25 expected amps. 20% is 5 amps so you need a 30 amp controller.
1.25 x 25 = 31.25 (6.25 more not the NEC required 5 more.)
โJan-30-2015 07:25 PM
jrnymn7 wrote:
Hey Stew,
The eco-worthy does not pair well with even two 12v panels in series. It has a 42v input limit. So that's out.
The solar30 will work, but is pwm, so some power will be lost, especially if there is shading, and will require heavier wiring. Also, it must be manually adjusted down to a suitable float voltage before leaving the cabin. So that may not be suitable.
The Tracer-3215RN is not adjustable, and requires an additional remote meter. So I would pass on that, personally.
The Tracer-3215BN is adjustable, but also requires an additional remote meter. This may be a good option
This is a forested location so there is considerable shading. Thanks for the info, I will look into the 3215BN
ebay price
โJan-30-2015 06:47 PM
โJan-30-2015 06:42 PM
โJan-30-2015 06:33 PM
โJan-30-2015 05:59 PM
KD4UPL wrote:
BFL13, what is the NEC reference about a "20% margin". That's pretty vague.
.
โJan-30-2015 05:24 PM
โJan-30-2015 05:19 PM
โJan-30-2015 04:56 PM