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 > Your search for posts made by 'crcr' found 81 matches.

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RE: Solar Panel, Unmarked Pigtails, which is Positive, Negative?

Thanks to Everyone for your prompt responses! Much appreciated. I will take the panels into the sun today and use a volt meter to verify that the MC4 connector with the red ring is positive. The OP must have got sun-stroke and zapped himself as well, or we would have heard back by now how that went. :) LOL, no sun stroke. I got a chance to test one of my three Renogy panels, and as expected by my many helpful friends on this forum, the pigtail with the red band is in fact, the positive lead. As is wont to happen, life then intervened and I didn't get a chance to test the other two panels. Most likely the polarity is the same on those as the first panel, but just to be thorough, I will test the other two panels tomorrow and report back. Follow-up: I did test the 2nd and 3rd panels of the same brand (Renogy) today, and the MC4 connector with the red ring is the positive pigtail on all three solar panels. Thanks again, everyone, for your helpful responses. Much appreciated!
crcr 01/09/20 03:36pm Tech Issues
RE: Solar Panel, Unmarked Pigtails, which is Positive, Negative?

I have another related question and since it is about the mounting of solar panels on an RV roof, I will ask it in this thread rather than start a new thread. I have stainless steel hardware to fasten the solar panels to my RV roof. Since stainless steel is known to sometimes gall, would it be wise to use a little bit of Anti-Seize on the SS nuts and bolts when assembling them? The pic below is of some copper-based anti-seize that I happen to have. https://i.postimg.cc/50Fm4JpJ/Anti-seize.jpg
crcr 01/08/20 08:01pm Tech Issues
RE: Solar Panel, Unmarked Pigtails, which is Positive, Negative?

Thanks to Everyone for your prompt responses! Much appreciated. I will take the panels into the sun today and use a volt meter to verify that the MC4 connector with the red ring is positive. The OP must have got sun-stroke and zapped himself as well, or we would have heard back by now how that went. :) LOL, no sun stroke. I got a chance to test one of my three Renogy panels, and as expected by my many helpful friends on this forum, the pigtail with the red band is in fact, the positive lead. As is wont to happen, life then intervened and I didn't get a chance to test the other two panels. Most likely the polarity is the same on those as the first panel, but just to be thorough, I will test the other two panels tomorrow and report back.
crcr 01/08/20 07:50pm Tech Issues
RE: Solar Panel, Unmarked Pigtails, which is Positive, Negative?

Thanks to Everyone for your prompt responses! Much appreciated. I will take the panels into the sun today and use a volt meter to verify that the MC4 connector with the red ring is positive.
crcr 01/08/20 06:20am Tech Issues
Solar Panel, Unmarked Pigtails, which is Positive, Negative?

I bought 5 solar panels recently, the pigtails on the two HQST solar panels are marked as to positive and negative, but the pigtails on the three Renogy 100w panels are not marked. On the HQST panels, the pigtail with the red band is positive. Would it be the same on these Renogy panels? Two pics of the pigtails on the Renogy solar panels. Which is positive and which is negative? https://i.postimg.cc/ryR8vKR7/Renogy-Connect.jpg https://i.postimg.cc/433GwdTL/Renogy-Close-Up-Connect.jpg
crcr 01/07/20 04:54pm Tech Issues
RE: The TFL guys bought a 7.3L

The 7.3L gas option is $1705, and the 6.7L diesel option is $10,495. That gets my attention. :):) x2 and the fact that right now diesel at one station near us is .60 more than gas. $2.69 vs $3.29. Gas / diesel price differential depends where you live. Here in S AZ, diesel is currently 17 cents LESS than gas, and a week ago when I filled up, was 24 cents less. Sometimes gas is less than diesel here, but in the last couple years, I find diesel to be less than gas most of the time. crcr where in AZ are you? I’m in Tucson and diesel is 50 cents more than regular gas at most every station. Phoenix. That's interesting that the differential is reversed from Phoenix to Tucson. I wonder why that is?? I wouldn't have a clue. But as I said, I find that often the last couple of years, diesel has been less than gasoline here. I paid $2.549 for diesel on 12/31. Gas was about a quarter more. This is at Costco (one Costco here has diesel, and so does a Sam's Club near us, so we always fill up at Costco or Sam's).
crcr 01/05/20 10:01pm Tow Vehicles
RE: The TFL guys bought a 7.3L

The 7.3L gas option is $1705, and the 6.7L diesel option is $10,495. That gets my attention. :):) x2 and the fact that right now diesel at one station near us is .60 more than gas. $2.69 vs $3.29. Gas / diesel price differential depends where you live. Here in S AZ, diesel is currently 17 cents LESS than gas, and a week ago when I filled up, was 24 cents less. Sometimes gas is less than diesel here, but in the last couple years, I find diesel to be less than gas most of the time.
crcr 01/05/20 04:23pm Tow Vehicles
RE: Need Good Sources for Quality Bulk Solar Cable

OP here. Follow-up: I thought I should share this. I ordered and received the wire in the link below, which was suggested in this thread, and after careful inspection, ended up returning it. The ebay listing states that it is copper AND, there is a prominent close-up pic of the end of a wire stripped, and it appears to be copper. When I received the roll of wire, I stripped some insulation off the end, and the wire was silver color. I thought maybe it is just tinned copper, so I scraped away a bit on the strands and I also clean cut the end, and inspected the wire under well-lighted magnification. There is some copper, and it might even be tinned copper, don't know, but if yes, the coating is not thin at all. Bottom line, per the listing and pic, I expected 100% copper or very close to it. But the percent of copper is clearly significantly lower than that. The insulation is quite thick and I really liked the light color (it's a cream color) for an RV roof. But due to the copper content issue, I returned it for a refund and bought a different product that did turn out to be 100% copper. Thanks again to everyone who responded to this thread! ML Solar, ebay
crcr 12/28/19 05:55pm Tech Issues
RE: 12v batteries reading 14.18v

It is my understanding that to get an accurate reading of batteries, they should be at rest for several hours first -- that is, not being charged, and no loads for several hours, then take a reading.
crcr 12/28/19 03:28pm Tech Issues
RE: Dual 6-volt battery box for TC wheel well

... When generation ago good battery would last 12 or even 17 years in cars, now getting 5 years is good luck. Not even talking about so-called "smart charging" system who recouping braking energy - kill the batteries in 2-3 years. I live in the desert Southwest, and I never recall getting 5 years out of auto batteries. Used to usually get right at or just under 3 years. Now we only get 2 years, consistently, in our car, and same in our diesel truck. I understand that the extreme desert heat is very hard on battery life, but I agree that it appears that battery quality has deteriorated.
crcr 12/26/19 05:31pm Truck Campers
RE: Dual 6-volt battery box for TC wheel well

The one below, I have had in service for 7 years now. No issues, has held up pefectly well, no warping of the plastic -- and we live in the SW desert heat! Century Plastics is the mfg. They have different sizes and configurations of battery box. This one is for two 6 volt batteries end to end. Century Battery Box - two 2 volt batteries https://i.postimg.cc/wMPrqrWL/Century-Battery-Box.jpg
crcr 12/23/19 05:46am Truck Campers
RE: Solar: Add Anything to Copper Crimps & Tilt Angle for Panels

The installation instructions for my Sharp panels I had a few years ago said minimum 5 degrees for rain drain. Warned about puddles on the panel making for "hot spots" (ISTR that was the term) and damage to cells. EDIT Read up some on that. Hot spots caused by shading with uneven heating. "Self-cleaning" by rainfall to clear off dust--most say at least 10 degrees. Panels have drain holes that should be kept clear. My Canadian Solar brand panel installation guide does not mention tilting for rain like my old Sharp one did. I have nearly flat panels on the Class C roof, and have seen how rain puddles make for dirty areas after they dry if the panels are dusty before it rains. That might lead to shading related hot spots if not washed. I clean my panels fairly often anyway. Thanks, BFL, 10 degrees or more makes sense, in order to get good rain run-off and dust wash-off, and eliminate any puddling of water after a rain. I'm installing five 100 watt panels, so I'm thinking of not angling them all the same direction. Even though installed at say a 10 degree angle, yes, at some times of day, the panels angled the slightly opposite way to the sun will provide a little less production. But at the same time, when the sun is in the opposite side of the sky, the panels angled the opposite way may provide a bit more production, so seems like it would balance out.
crcr 12/16/19 11:55am Tech Issues
RE: Solar: Add Anything to Copper Crimps & Tilt Angle for Panels

I am concerned that if one puts a non-conductive substance into a crimp, that it might hinder connectivity.
crcr 12/16/19 11:50am Tech Issues
RE: Solar: Add Anything to Copper Crimps & Tilt Angle for Panels

I have seen something somewhere recently not to use any goop in there like that, but can't pin it down at the moment. Was in one of the owner's manuals for something, not to use any of that red spray stuff you use on battery posts. Might not be the same as what you are asking about. 5 degrees to get run off, but the roof may already be at that with camber. Thanks. Yeah, I think I read something recently somewhere also recommending to put nothing. I used to put Ox-Gard on such connections, but now I am questioning the wisdom of that. My roof is very close to flat, though must be rounded ever so slightly to each side. I was thinking for the two panels nearest the front of the TT, to tilt them down slightly toward the front due to forward motion when traveling, but I suppose any such angle like 5 degrees or so is so slight that it probably doesn't matter which direction they are tilted in.
crcr 12/15/19 06:36pm Tech Issues
Solar: Add Anything to Copper Crimps & Tilt Angle for Panels

I'm in the middle of installing a solar system, and have a couple of questions: Heavy Duty Tinned Copper Lugs crimped onto Copper stranded wire -- Use any anti-corrosive or conductive grease type material in the joint before crimping it? Or better to use nothing? FYI, I do use a high quality adhesive-based clear shrink wrap on crimped joints. I am putting five 100 watt panels on the roof, non-tilting mounts. My question is, what is the recommended slight angle to mount solar panels for the purpose of rain run-off? Thanks in advance for any recommendations!
crcr 12/15/19 05:52pm Tech Issues
RE: Los Algodones Border Crossing

It is a krap shoot. Going across is no problem, it's the return trip. We have stood in line for over an hour and then the next trip, walk right up. The time of day, to me really doesn't make any difference, it could be either way.. Just count the time in line as an "experience" and enjoy it. ^ What he said. Wait times are a bit unpredictable. But generally going on a weekday there is less traffic. We went to the dentist there on a Friday once, and the wait coming back into the U.S. was fairly long -- longest we ever recall and we have been there many many times.
crcr 12/14/19 06:37am RVing in Mexico and South America
RE: Need Good Sources for Quality Bulk Solar Cable

I bought mine from these guys. They also sell on eBay. If you want two wire duplex solar cable that is round, check out AM Solar. The round 10ga duplex from A.M. Solar is premium stuff. UV rated jacket too. Thanks. Actually, I already ordered the 100 ft length of white cable in your ebay link earlier today. Looks like nice cable. We live in the SW desert and our TT sits in the sun in front of our house, so since it gets so hot here, my preference was white cable. Insulation looks thick in the image, which is generally good, but I wonder if it might be difficult to get MC4 connectors on it due to the apparently thick insulation.
crcr 12/13/19 11:03pm Tech Issues
RE: Recs for Solar Cut Off Switch?

Don't know what counts as big and ugly, but you can use an ordinary 120v household light switch in the wall next to the controller. IMO not ugly, but might be too big, no idea. Doesn't matter if the wire being switched is 120v or 12v. You can switch either the pos or neg "ARRAY" wire to the controller and it will cut off the array. There might be a trick as to which wire to switch depending on whether the controller is positive or negative grounded and if it is grounded--in an RV no need to ground the array or controller, but who knows what an installer will do? Or it might not make any difference no matter what. Somebody else who knows more can jump in on that as required. I am not an expert on solar systems, but from my study, I believe that the positive leg should be switched, as opposed to the negative side. This is the same as wiring in 110V, where the positive side of a load should be switched, as opposed to the negative side.
crcr 12/09/19 05:56pm Tech Issues
RE: Recs for Solar Cut Off Switch?

If needing to disconnect panels from system it's as easy as pushing a button. https://i.imgur.com/928BnVXl.jpg Actually, you should have two DC breakers like that, one between the solar panels and the controller, and one after the controller, before the inverter, so that you can completely isolate the controller from the system if need be. It looks like that's how this system is wired, and that's how I wired my system.
crcr 12/09/19 04:05pm Tech Issues
RE: Recs for Solar Cut Off Switch?

Are you wanting to shut off power from the solar panels to the controller? If yes, why? If your batteries are full and your solar controller is a good one and is working correctly, it will never put more power into the batteries than what they need. That's what the controller is for.
crcr 12/09/19 03:20pm Tech Issues
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