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Old 08-30-2012, 03:30 PM   #31
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Re: Solar musing

I am putting a power inverter to mostly to run my little 4 cup coffee maker while on the road, it is much quicker than using the stove. the 4 cup cuisinart coffee maker makes about as good a coffee as you can get from a electric drip machine and only uses 550 watts and is very quick, can pull over and make coffee in about 10 minutes. I will not need a drive thru
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Old 08-31-2012, 12:20 PM   #32
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Re: Solar musing

I have neen researching RV solar installations. Here are the best sites that explains the best solar applications.
http://www.thewanderman.com/2011/11/...ap-part-1.html
http://www.jackdanmayer.com/rv_electrical_and_solar.htm
http://handybobsolar.wordpress.com/t...ging-puzzle-2/
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Old 08-31-2012, 12:25 PM   #33
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Re: Solar musing

OT -- A readable article on what IBM is doing to research next generation solar panels:

http://arstechnica.com/science/2012/...-fossil-fuels/
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Old 08-31-2012, 03:59 PM   #34
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Re: Solar musing

Quote:
Originally Posted by Dmac
... power inverter only uses 550 watts...
DMac, that may not be much power but it is a lot of current that your wires must carry. The 50 amps (550/12 + inefficiencies) must come from your battery, through the power distribution panel to your inverter. To carry this amount of current, you should have at least #8 wire (and possibly #6, depending on the type of wire) which I know my trailer was not wired with.
When you use it for the first time, watch and feel the wires to make sure they don't get too hot.
Good luck and be careful.

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Old 08-31-2012, 04:26 PM   #35
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Re: Solar musing

Thanks, I am using a triplite 1700 watt inverter that i have installed for a few customers in their work vans, I seem to remember we used #2 wire. I will be going directly to the battery and locating the inverter in the lhs front by the converter so the wire run will be short. I can source this inverter locally for a very reasonable price and have good luck with them so far. The guys that i have installed them for are using them much harder than i ever will and they seem to be holding up. the1700 is a running wattage not a start up so it will be plenty for a cup of Jo on the road.
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Old 08-31-2012, 05:46 PM   #36
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Re: Solar musing

The wire size needed for an inverter is determined by a couple of factors. There is the standard "look it up in a wire table" for the proper size for length & maximum current draw, but often overlooked is insuring that the wire size is large enough to prevent enough voltage drop to shut down the inverter under heavy demand. The typical 3% drop most wire tables use may be too much for the inverter. Most large inverters will shut down at a pre determined voltage input to prevent killing the battery. You may have plenty of battery left, but if the wire size is too small the voltage drop will shut the inverter down well before there is an overheating problem due to wire size.

For example, Prowatt suggests 1/0 wire size for a 6' run (total length of both wires) for their 1000 watt inverter, much larger than a wire size table would indicate.
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Old 08-31-2012, 07:24 PM   #37
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Re: Solar musing

Escape put 10 gauge wire in my trailer for the inverter and I was told not to go over 1500 watts. The wires are connected to what looks like relays or circuit breakers. Do these wires now have to be changed.
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Old 08-31-2012, 07:55 PM   #38
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Re: Solar musing

Quote:
Originally Posted by digger57
Escape put 10 gauge wire in my trailer for the inverter and I was told not to go over 1500 watts. The wires are connected to what looks like relays or circuit breakers. Do these wires now have to be changed.
Can you post some pictures of your inverter/wiring set up?
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Old 08-31-2012, 08:07 PM   #39
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Re: Solar musing

I haven't purchased an inverter yet, I just need to make sure the wiring is correct or if I need to change it. I am not sure if the wire is different because of the solar panel install or that doesen't matter. I won't be going more than 1000w with the inverter.
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Old 08-31-2012, 10:43 PM   #40
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Re: Solar musing

Quote:
Originally Posted by digger57
I won't be going more than 1000w with the inverter.
You will have to run a dedicated circuit, bypassing the Power Distribution Panel (PDP), going directly to the battery (using it's own breaker) as Dmac said he has. A 1000W inverter (about 90% efficient) will draw about 75 amps (1000/12/0.9). My PDP states that it has a maximum of30A DC per circuit. For 'house' wiring, #10 wire is capable of carrying 30A (this does NOT take into consideration of voltage drop) but temperature is the main criteria. If you are going to draw 75A, you will need wire close to the size of your (at least mine) finger.
If you need 1000W, you should look at 120VAC and not 12VDC. Basically, you will draw 10 times the current on DC as you would on AC.

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