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Old 05-31-2013, 08:06 AM   #15
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What wattage is your Modified Signwave Inverter? What is the draw of the fridge?

Why not change out the inverter. Samlex makes a 300w and a 600w PSW inverter for a few hundred bucks. Google it. Amazon has them.
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Old 05-31-2013, 08:49 PM   #16
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So assuming it is full with lots of thermal mass, and everything is chilled, it should easily make 10 hours off of my 110 ah (50%) of usable storage. My truck has 350A of alternators, but I don't know how much charging gets to the batteries.

It appears to be working properly. The temperature has acjieved it's max cooling while plugged into the inverter.
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Old 05-31-2013, 10:49 PM   #17
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What wattage is your Modified Signwave Inverter? What is the draw of the fridge?

Why not change out the inverter. Samlex makes a 300w and a 600w PSW inverter for a few hundred bucks. Google it. Amazon has them.
The MSW inverter is 3000W. It is inexpensive but had good reviews. It was just an experiment. My goal is to update to 4 x 6V batteries and a high end PS inverter/charger. I have my eye on a Outback Power 2812, but that may be in next years budget.
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Old 06-01-2013, 12:25 AM   #18
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I have my eye on a Outback Power 2812, but that may be in next years budget.
Other than the fact that the Outback is marketed to the off-grid community, I'm not sure if it's any better than the Magnum MS2800 I bought from Amazon for several hundred less.
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Old 07-04-2013, 05:57 PM   #19
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Just a follow-up. The MS inverter runs the wine fridge well. We have taken the rig on two trips and the batteries stay fully charges from the truck while towing. The only issue is the cooler is dual zone and the lower zone for whites can only stay around 54 degrees due to the ambient temperature in the rig while towing. That's OK because it saves a lot of space in the main fridge and it seems to cool back down to 42 degrees over night.
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Old 07-05-2013, 06:16 AM   #20
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I run a Xantrex Freedom 458 MSW 2000 Watt inverter. It powers all of my outlets. 3 TVs, Sat Receiver, DVD, Wii, 2 laptops, MIFI, fan, microwave (Limited use)with no problems. The only thing I have found that can't run off of my MSW is my electric blanket.
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Old 07-05-2013, 08:10 AM   #21
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The only concern with this approach is that the voltage in an RV varies from ~12.0-14.5 V depending on what part of the charging cycle the charger is in. Most devices won't mind this variation, but some might.
Thermoelectric coolers will not mind voltage variations much larger than that. However, the efficiency will drop off with voltage.

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Old 07-06-2013, 09:12 AM   #22
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Some residential refrigerators have built in rectifiers and the compressor motor are 12 volt DC. The two I am aware of are Samsung and Amana, either of which are compatible with MSW inverters.
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Old 07-07-2013, 07:44 PM   #23
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Does the inverter draw the same amount of DC amperage regardless of the AC load on it? I am wondering if we change to an LED TV (to use less AC power) with the same inverter if it would make any difference in battery life? Or will I need to just go to a smaller inverter? The TV will be the only load on the inverter.
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Old 07-07-2013, 08:53 PM   #24
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with any MD inverter running a motor

MD inverters are more made for motor type work ... just not laptops
but keep in mind they like to make motors run more hot

most of the time you can tell buy the sound the motor/pump gives off when on house power and then inverter power if you would like to know more.... test this with a 19inc box fan from like walmart

if the inverter do not like the item you have it on it well humm really really bad

with a fridge just the pump i would test the temp on house AC
then test the temp again when its on the inverter as sound is harder to tell with a fridge

if you see temps you dont like try a new fridge or like a 98% Md inverter
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Old 07-08-2013, 06:59 AM   #25
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Does the inverter draw the same amount of DC amperage regardless of the AC load on it? I am wondering if we change to an LED TV (to use less AC power) with the same inverter if it would make any difference in battery life? Or will I need to just go to a smaller inverter? The TV will be the only load on the inverter.
Yes, the inverter should use less amperage with less output load. It should be directly correlated to the total wattage on the output. But your biggest savings would probably be to get a 12v LED TV. The inverter is only about 90% efficient at converting DC to AC. So keeping it all DC will save you 10% by itself. Inverters also have some draw from just being on with no load, the larger the inverter the larger the "idle" draw. So that should save you some amperage.

Just make sure if you buy a 12V tv, that you also buy the optional adapter for when you have shore power.
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Old 07-08-2013, 06:10 PM   #26
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this may help 1 amp ac to 12 dc is all most 3 amps

this number all most works all the time 1x3 and in amps only

AC DC load on battery's
1 12v 3
1 24v 1 thats why you see 24v in alot of high end RVs it 1 to 1
1 48v .2 i had this system running my house in FL for 4 year off grid
this is on a SW inverter with a TriMetric TM-2025



do not run MD inverters on TVs high end high cost items
its like running a car on bad gas yeah it well run but you well kill some thing every 6 months
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Old 07-08-2013, 08:29 PM   #27
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this may help 1 amp ac to 12 dc is all most 3 amps
I'm not sure what you're trying to say but it's not correct.

One amp of 120 V AC current is 120 watts of power; to get the same amount of power with 12 V you would need 10 amps of current.

Power = current x voltage
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Old 07-08-2013, 09:02 PM   #28
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That is correct, 10 times the AC current.
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