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shastagary

minnesota

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Posted: 09/03/20 10:56am Link  |  Quote  |  Print  |  Notify Moderator

3m vhb tape with eternabond tape over the top of the brackets have held up good on a fiberglass roof for 3 years for this guy Solar Install Pt 1: No Drill Solar Panel Install

Colo Native

Colorado

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Posted: 09/03/20 10:58am Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

Colo Native wrote:

Where does the 24v come from? and does it matter?
Comes from the panel. It only matters if you get a controller that won't handle it.


The controller lists:
System Voltage : 12V/24V Auto Recognition Battery Rated Current :
40A Max Battery Voltage :
32V PV Input Voltage Range : 15V – 100V VOC
Max Power Input : 12V @ 520W 24V @ 1040W: S


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red31

Dallas

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Posted: 09/03/20 11:08am Link  |  Quote  |  Print  |  Notify Moderator

you will be less than 100v VOC input
you will be less the 520w of solar for 12v battery (system voltage).

32v is max battery voltage

Colo Native

Colorado

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Posted: 09/03/20 12:51pm Link  |  Quote  |  Print  |  Notify Moderator

Anybody used these
https://www.renogy.com/corner-bracket-mount/

Lwiddis

Lone Pine, CA

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Posted: 09/03/20 06:48pm Link  |  Quote  |  Print  |  Notify Moderator

“The panels are sitting in a guys garage...”

Not comforting. You need a heck of a discount from him.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watts solar-parallel & MPPT, Trojan T-125s. TALL pole for flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - (MOS 1542 & 1560)


KD4UPL

Swoope, VA

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Posted: 09/03/20 07:26pm Link  |  Quote  |  Print  |  Notify Moderator

Sorry guys. I had a typo with the 310 watts, it's obviously 510 watts of PV, But the amps is still the same: 510 watts / 12 volts = 42.5 amps.

2oldman

Mecca

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Posted: 09/04/20 07:56am Link  |  Quote  |  Print  |  Notify Moderator

510w of solar will rarely if ever hit 510w. Maybe 400.

time2roll

Southern California

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Posted: 09/04/20 08:49am Link  |  Quote  |  Print  |  Notify Moderator

KD4UPL wrote:

Sorry guys. I had a typo with the 310 watts, it's obviously 510 watts of PV, But the amps is still the same: 510 watts / 12 volts = 42.5 amps.
40 amp MPPT is perfectly good for this set-up. Actually a 30 would be fine. Only very rare conditions would produce close to 40 amps.


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BFL13

Victoria, BC

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Posted: 09/04/20 09:39am Link  |  Quote  |  Print  |  Notify Moderator

Using 7 flat vs 8 aimed ratio (based on some tests I did in May at 49N)
for amps output at high noon starting with aimed--

510w with 10% heat loss = 459w with say 2% line loss array to controller= 450w input with say 5% controller loss = 428w output. Amps to battery is output watts/battery voltage, so: (with no line loss controller to battery)

428/12.5 = 34.2a and 7/8 of that is 30 amps estimated
428/13.5 = 31.7a and 7/8 of that is 28 amps estimated


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Colo Native

Colorado

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Posted: 09/04/20 10:37am Link  |  Quote  |  Print  |  Notify Moderator

My old system on the FW was 510w solar with a 45 amp tristar and it worked fine. I agree with them laying flat I doubt they would over produce the controller.

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