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Old 02-24-2015, 08:37 PM   #1
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Modifying MH to use off grid

My MH uses one 12v house battery, a 55 amp converter, but no inverter. Can current electrical system be modified by adding solar panels and 1000w (or higher) inverter or will a second 12v battery be needed to power a 19" TV, LED lights, and possibly the fridge? If this question has already been addressed, please let me know where I can find it. Thanks for your help.
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Old 02-24-2015, 08:55 PM   #2
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Are you looking to put a residential fridge in? I think that would drive a lot of unnecessary demand as opposed to propane fridge.
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Old 02-24-2015, 09:02 PM   #3
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No, using same fridge that came with MH, which uses both electric and propane, but propane side doesn't work (probably just needs to be cleaned). We now use a cooler while unplugged, so not having the fridge is no big deal.
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Old 02-24-2015, 09:14 PM   #4
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I think you'd get more answers if you post this question to the RV Systems and Technologies ---> Going Green portion of this forum. Lots of solar discussions there.

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Old 02-24-2015, 09:15 PM   #5
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I would fix fridge, or look at replacement, I run 4 six volt batteries, and to run elec on the fridge with convert/invert will suck those bats down. even with solar.
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Old 02-24-2015, 09:22 PM   #6
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If we remove fridge from the equation, could suggested modifications support the other stuff?
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Old 02-24-2015, 09:36 PM   #7
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Your 12v 55 amp battery is most likely not a true deep cycle. On batteries it's best not to run them down more than 50%, so you only have ~27 amp hours of use available. More true deep cycle batteries would be the most bang for your buck.
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Old 02-24-2015, 09:39 PM   #8
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Mis-read op, 55 was converter, not battery size, more batteries still best option IMHO.
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Old 02-24-2015, 09:44 PM   #9
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If ya have room, invest in 4 six volt batteries, get an 80 amp smart charger, and you should be good to go, less the fridge. 30 minutes of genny with that setupup runs my tv, and dish for six hours before I charge again for 30 minutes.
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Old 02-24-2015, 09:49 PM   #10
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There is also a fellow over on this tread who gutted a trailer to the frame and has built a system from the ground up. He's just about to put the solar in but weather and a bum knee has him on hold. Terry (Harley1994) might be willing to give you some advice since hes already done all the math. (Sorry Terry, I volunteered ya)

But here are some basics.

To start you have to get the numbers together for what your current draw will be for each of the things you want to run while off gridding. Then for the 110 stuff, you need to get an inverter that can run the right amount of current. Make sure you are looking at continuous output not peak and make sure the peak will give you some buffer for "starting" anything electric. A fridge has a short surge when it first comes on. So does AC or a fan motor.

You will need more than one battery unless you only plan to do very limited 110 volt stuff. Some of your juice is consumed by the inverter. Best route is four 6 volts wired in series or series/parallel to get either 12 or 24 volts. See photos.

A small flat panel TV like this one is pretty light on current for a TV, I'm sure there are better.

Power Supply (Voltage, Hz) 100V ~ 240V, 50/60 Hz
Power Consumption Normal on: 33w. Sleepmode 1w. DC off 0.4w Standby Mode 0.4W

Your solar panel(s) needs to be able to produce in 10 hours more than you will consume in a day by 20%. This will give you some cushion and allow for some cloudy days.

As for your broken fridge, to make use of it without servicing/replacing, just pick up some dry ice on the way out of town and use it as an icebox. Just a thought. No point in it being dead space.

Hope this helps you at least get started.
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Old 02-25-2015, 05:44 AM   #11
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Just for information,

A gas/ electric,RV fridge will use around 350 watts when running( heating coil ) on AC. That is around 30 amps@12 volts, thru an inverter.

An apartment size, household fridge will use around 100 watts when running on AC. That is around 8 amps @ 12 volts, thru an inverter.

All numbers are estimated.

Enjoy
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Old 02-25-2015, 07:24 AM   #12
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Don't know where you are located, but do not forget the furnace. The furnace blower motor can use quite a bit of 12 VDC power.
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