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 > Your search for posts made by 'pianotuna' found 2461 matches.

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  Subject Author Date Posted Forum
RE: Pull battery for winter?

Best is to leave in the RV with a (modest) solar system. Using a disconnect switch so that all parasitic loads are removed is good, too.
pianotuna 11/25/15 05:37pm General RVing Issues
RE: Does Using SmartPhone as Hotspot Ruin Battery?

Hi, Some wifi hotspot devices have a problem with being constantly plugged in. Most do not. I've used my cell phone as a hotspot for more than a week at a time. The biggest issue is running out of data.
pianotuna 11/25/15 05:26pm Technology Corner
RE: UL's View Of Aluminum Electrical Components

Hi Mex, Thanks for the heads up.
pianotuna 11/25/15 05:11pm Tech Issues
RE: need recomendation for 200 watt solar kit and batteries

In a trailer situation charging from the alternator may be no more than about 10 amps. It is possible to modify that by increasing cable size. Another solution is a 2nd alternator for the tow vehicle. Yet a 3rd is to add an external regulator to the oem alternator. Solar was my choice, for a battery charging solution.
pianotuna 11/25/15 05:59am Tech Issues
RE: Amps/Watt draw for a microwave and any heat element

Hi, Nothing wrong with your math, but you have assumed a pure sine wave inverter is 100% efficient. They are not. The best seem to be about 88%, but that figure is not under full load. Often (but not always) peak efficiency is at about 60% of full load. So the 10 amps @ 120 volts becomes 100 amps @ 12 volts. 100 /.88 = 113 amps @ 12 volts. However under a 100 amp load there will be voltage drop. It is often 0.5 volts. So now the 113 amps is going to be about 4% larger or about 117 amps. But that doesn't allow for line losses due to resistance. By the time all those factors are taken into account, dividing the original 1200 watts by 10 is a good ball park for the amps of demand at 12 volts. Ohms Law. I = E/P where I = Current, E = Voltage (120), and P = Watts. A 1200w Microwave would be 120/1200 = 10A
pianotuna 11/24/15 08:19pm Fifth-Wheels
RE: Battery charge/discharg plot

Thanks Salvo.
pianotuna 11/24/15 08:06pm Tech Issues
RE: Amps/Watt draw for a microwave and any heat element

Hi ekyyc7, If you want help then it is best to be polite. Microwaves do not have a 'heating element' in the sense of a resistance heater. The accepted way to convert from watts to amps with an inverter in use is to divide the watts by 10. For example my microwave is 1591 watts so it draws about 160 amps. And I don't think Mw's have a heat element. They do have a heat element. I know I can look stuff up genius...pointless answer.
pianotuna 11/24/15 03:14pm Fifth-Wheels
RE: Will laser heat sensor find inadequate battery cables?

Hi, It is not so much the higher voltage of a 12 volt jar. It is that there are, for the same amp-hour capacity, twice as many cells, so the load per cell is 50% of what it is with 6 volt jars. 15 minutes of MW is going to be a struggle even with 6 batteries. Higher voltage may help, but that's still a whopping load.
pianotuna 11/24/15 08:39am Tech Issues
RE: Will laser heat sensor find inadequate battery cables?

Hi Mex, Thanks for explaining how to check for voltage drop across terminals.
pianotuna 11/24/15 08:37am Tech Issues
RE: need recomendation for 200 watt solar kit and batteries

Here is a simple flow chart. Budget-->Energy Audit-->Battery bank size-->number of watts-->PWM or MPPT. What ever type of controller is chosen, make sure it has adjustable set points and a temperature probe that is on the battery. If you use solar as a battery charger, one rule of thumb is between 60 and 150 watts of panels per 100 amp-hours of storage. The smaller the battery bank the higher the wattage needed (per 100 amp-hours). Here is a link to the rather special spreadsheet which includes an energy audit, that N8GS has created to help size solar battery charging systems! http://w8usa.org/club-library/documents-presentations/ If you full time or use an inverter lots, then populate the entire unshaded area of the roof with panels. I'm considering replacing my awning with solar panels. For a nice explanation of solar, try this link: http://www.jackdanmayer.com/rv_electrical_and_solar.htm#The%20Golden%20Rules
pianotuna 11/23/15 12:34pm Tech Issues
RE: powermax upgrade

The powermax is of newer design, so I'd lean that direction. Both are adequate.
pianotuna 11/23/15 12:32pm Fifth-Wheels
RE: Pink stuff in the toilet?

Hi, I think it is a good idea to have some.
pianotuna 11/23/15 12:30pm General RVing Issues
RE: Wonderful

Hi Mex, You can only "point" to online storage of pictures from these forums. Storage has to be some place else so drag and drop are really of no use here.
pianotuna 11/23/15 12:29pm Tech Issues
RE: should I fill water tanks in Freezing weather

Is the water tank in a heated area of the rv? If so, filling will be just fine. If it is NOT or is exposed, I'd wait.
pianotuna 11/23/15 08:49am Full-time RVing
RE: plug failures

Hi Johno02, They were brand new and bright and shiny. poor connections, over loading, low voltage, high resistance due to corrosion..... Steel Brush you connectiors until they are clean and bright, and use dielectric lubricant on pins.
pianotuna 11/22/15 05:37pm Tech Issues
RE: plug failures

Hi 2oldman, Yes. Odd. Are the internal wire connections good and solid?
pianotuna 11/22/15 05:35pm Tech Issues
RE: plug failures

Hi smk, That is exactly what I am saying. They were never plugged directly into shore power and they were never connected under load. Further I had limited the current to a maximum of 13 amps to prevent the shore power breaker from tripping. Are you saying you bought these two items and plugged them into each other and they have burn marks from 15 amps? Was power off when you plugged in?
pianotuna 11/22/15 10:27am Tech Issues
plug failures

Hi, Why would a 30 amp plug connected to a 15 amp shore power show evidence of heating to the point of showing brown marks? The burns are on the "wide" blade. If I was pushing 30 amps from a 30 amp shore power I could understand some heat stress. It appears to be worse on the female plug. Voltage under the greatest load was 106, and more often was about 112. The plugs in question are: http://ecx.images-amazon.com/images/I/41tavH%2B3wUL._SX355_.jpg width=250 and http://ecx.images-amazon.com/images/I/31nY1fu%2Bz3L.jpg width=250
pianotuna 11/22/15 09:11am Tech Issues
RE: Idea for simplified water tank heating -- need your advice

That manual valve would be nice when boondocking to preheat the water lines--so there would be less waste water. Go for it!
pianotuna 11/21/15 09:31pm Do It Yourself Modifications and Upgrades (DIY)
RE: what exactly is a RV that is "4 seasons ready"?

Enclosed tanks and no exposed water or waste lines would be the absolute minimum for four seasons.
pianotuna 11/21/15 03:17pm Beginning RVing
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