I'm just not good at figuring this stuff out and I am to Old to start now so I am asking you...... LoLI have 2 12volt Deep Cycle Batteries with the following according to the NAPA Web Site... Batteries are Napa part # 8240 Attributes:Battery BCI # : 24DCMBattery Cold Cranking Amps @ 0 Degrees F : 550Battery Cranking Amps @ 32 Degrees F : 685Battery Load Test Amps : 275I have a 1000 watt inverter....According to the sticker on the HEATING PAD it says; Rated 70 Watts Max.My questions is will this setup last me all night?......Do you need any more information?Thanks Lee

I'm not even going to attempt the math but I would imagine someone will need to know what setting you plan on using on the heating pad. The one I use has 4 different settings. If you're just trying to stay warm at night (as opposed to treating an injury), invest in a mummy bag and mummy liner.

For starters, your batteries are not true deep cycle.. they're hybrid marine cranking batteries..

Just make sure your INVERTER is the PURE SIGN WAVE type. The MSN INVERTER may cause your heater pad controller go up in BLUE SMOKE...Your 70WATT Heating pad will draw around 5AMP DC from your two batteries. You need to look up the battery specs and see how long your can safely pull 25AMPS from your two batteries.A TROJAN 27TMX 85AH 12VDC battery is rated to produce 25AMPS for 175 minutes or 2.9 hours. Two connected in parallel will produce 25AMPS for a good 5.8 hours. Your trailer will also have some parasitic power drains and of course you will be running some 12VDC lights at night. I would be running my HDTV and a few other home entertainment items as well... You really need to find out what is going to be on and add up the power drains. In addition if you run down your two batteries over night it would be wise to have a way to quickly re-charge them as batteries sitting in a fully discharged state for a long period of time will do internal damage to your batteries requiring replacement. To be successful you need to do some more planning and possible upgrades to smart mode converter/charger and LED lights etc. You also may need to have a small 2kW Honda type generator to connect your 30AMp SHore Power Cable to and recharge your batteries to their 90% charge state the next morning so you can can use them again the next night etc... If you have smart mode charging technology you can re-charge your two batteries in a short three hour generator run time. I do this at 8AM each morning during breakfast and this is when I make my coffee for the day when the generator is running...I was never lucky just going to the woods and turn on things without planning and perhaps a couple of trail runs in my back yard. It always got dark on me around 10PM... Roy Ken

You might go the old-fashioned route: hot water bottle. Or maybe those hot-or-cold gel pads you can buy at the drug store. I've used a flexible flask with warm water in it; never had it leak.You can also get chemical "hand warmers" at sporting goods stores. Put one inside a sock (not while you are wearing the sock) so it cannot come in contact with skin and use it like a hot water bottle.

X2 Roy Ken. It is VITAL that your inverter be PSW PURE SINE WAVE. A MSW modified sine wave inverter will fail the control module of your heating pad almost instantly.Your heating pad would (most probably) not stay on 100% of the time. However with losses in the system pretty much count on a 9-10 amp draw. Twelve hours of operation will FULLY DEPLETE (to 50% remaining capacity) a pair of group 24 cyclable batteries if the pad duty cycle is 100% I've never seen an inverter gobble less than 2 amps vigorish.Sigh. A propane powered heating pad. Sigh.

Boondocking using HEATING PAD | Good Sam Community

mena661
Explorer
Jan 11, 2014
If the inverter with the cig plug was really cheap, it most likely is a MSW. Most PSW inverters will say pure sine wave somewhere on the unit. I believe the dimmer switch heating pads are MSW friendly.
dclark1946
Explorer
Jan 11, 2014
Once you have your inverter/heating pad issue worked out you may want to change your batteries to something with more capacity. If you want to stay 12V you should be able to go with a pair of Gr 27 like a Trojan SCS 200 battery with 115AH per battery. You will still need to run the generator every day but these batteries will provide more reserve capacity.

Dick
Just_Lee
Explorer
Jan 09, 2014
Ah ok thanks.. I do have a Heating Pad in the house that has dial controls (almost like a dimmer switch) would that one work the MSW inverter?

I also have a inverter that plugs into the cigarette lighter. It is 200watt.... Not sure what it is MSW or the other one....

Gotta leave in a few I'll chaek back later

Thanks
mena661
Explorer
Jan 09, 2014
Ok, since you have digital controls and a MSW inverter, it would not be a good idea to run the blanket from your inverter. MSW typically will smoke digital controls. If you really want to do this you can buy a PSW inverter just to run the blanket.

Size of the inverter depends on how much power the blanket draws in watts. You can find that out by getting a Kill A Watt meter and plugging your blanket into that.

Kill A Watt Meter Clicky
Just_Lee
Explorer
Jan 09, 2014
mena661 wrote:
We nerds get carried away sometimes. :B Let me simplify it.

1. Is your inverter pure sine wave (PSW) or modified sine wave (MSW)?
2. Does your blanket have digital controls?

We'll move on once those are answered.

I have a Xantrex 1000 watt MSW Inverter and
To me YES it looks like my electric PAD is digital by that I mean you push the button to increase the heat (it is NOT a SLIDE dial)I tried to Google the Pad and didn't get anything..

Hope this helps

Yes I know I will have to run the generator EVERY day to re-charge the batteries.....

Thanks for simplifying this......

Lee
ICamel
Explorer
Jan 09, 2014
One other thing that has not been mentioned. I have two pure sine wave inverters. Both have a function that will sound an alarm and then auto shut off when the inverter senses the battery charge to be 50% of maximum.
SCVJeff
Explorer
Jan 09, 2014
I used to have a 3 position heating pad until it got plugged into an MSW inverter and all the smoke leaked out.

I tried to blow smoke up.... Wait, that was something else... :)
Anyway, I don't think a mechanical switch is a guarantee that its MSW safe, so be careful and pay attention to your nose for the 1st 30 mins just to make sure.
MrWizard
Moderator
Jan 09, 2014
Just Lee

Your two batteries should carry thru the first night

But you need to recharge the batteries before doing a second night

Each night you use the heat pad, recharge batteries next day
mena661
Explorer
Jan 09, 2014
Just Lee wrote:

So I guess I'll just plug it in and see what happens..
We nerds get carried away sometimes. :B Let me simplify it.

1. Is your inverter pure sine wave (PSW) or modified sine wave (MSW)?
2. Does your blanket have digital controls?

We'll move on once those are answered.
Just_Lee
Explorer
Jan 09, 2014
Oh boy I think..... I am more confused now then I was....

Thanks for trying to explain... All I really wanted was a Yes or No.

But I can see there is much more to it them meets the eye....

So I guess I'll just plug it in and see what happens..

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