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 > Off grid for first time, need some guidance !

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OBX-GL

Ontario

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Posted: 07/29/21 05:55pm Link  |  Quote  |  Print  |  Notify Moderator

Wow. Haven't posted in a while. I have missed tapping into all the available wisdom here.
With Covid and boarders closed, site availably has sucked around me.

We managed two sites consecutively at a great campground. Problem is one of them has no hook up. DW says she only needs the propane fridge/ its DC power circuit. i'm converting to LED bulbs throughout, likely only a bulb two for a few hours each day. i guess there will be the DC holding tank pump draw for a few seconds now and then. Am i missing any other loads ?

Question - i have currently only one new deep cell group 24 marine battery, (1000 crank amps 130 reserve capacity) no other useful info on the label. How far will this thing last with my minimal loads ?

I am willing to buy solar, and/or more bigger batteries. However, will likely never use them again.
Milwaukee tool offers an expensive power station that i could justify for use at work. However, it only provides 750whr before it also needs charging.

If me. what would y'all do for a weeks time till hook up is available ?

Thx in advance !

Greg


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Robbies grandpa

Central Florida

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Posted: 07/29/21 06:09pm Link  |  Quote  |  Print  |  Notify Moderator

I don't think your set up will last very long even being frugal. I use two golf cart batteries when I go fishing in the mountains. I have a Honda 2000 generator that I charge them with. They will charge with the generator just idling every day for about an hour. This works even when the heater is running all night with the temperature 19 degrees.

NamMedevac 70

Reno

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Posted: 07/29/21 06:13pm Link  |  Quote  |  Print  |  Notify Moderator

I have had very good results using a small 2000W gas powered inverter generator (Firman) from costco and before that a larger heavier Champion 3500 generator. Both had the RV receptable and standard 120 AC receptacle. With adapter you can use RV socket for 120 AC also. Also has a usb socket for charging phone and laptop. I also carry a spare 12 volt truck battery for use with trailer and truck as backup plus a small smart battery charger to charge batteries if needed. Each item is very small and weighs less than 50 lbs. For jumpstart emergency I have inexpensive but powerful lithium power bricks/banks that will fit in your glove compartment. They have worked wonders for me when I had starting problems. The brand of one of them is "Type 5 or S"

In the quiet econo mode I can run generator for 8 to 9 hours on one gallon of gas.

rlw999

Washington State

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Posted: 07/29/21 06:29pm Link  |  Quote  |  Print  |  Notify Moderator

If you'll have full sun, you could get a 100W solar panel + charger and hook it up to your house battery to keep it charged.

With good sun (the panel needs to be shade free for most of the day), you should get around 30 Amp-Hours a day of charge for your battery from a 100W panel. Since you can keep your battery power usage to a minimum this should be more than enough.

That 130 minute reserve capacity battery will give you around 54 amp-hours of capacity, but you can only reasonably use around half that without discharging the battery too far.

Boon Docker

Mountain Foothills of Southern Alberta

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Posted: 07/29/21 06:35pm Link  |  Quote  |  Print  |  Notify Moderator

Get a 1000 watt generator to charge your battery

Sandia Man

Rio Rancho, NM

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Posted: 07/29/21 06:54pm Link  |  Quote  |  Print  |  Notify Moderator

Well, without investing in any of the aforementioned items my only guess is possibly charging your single battery with your vehicle daily to keep it from going dead by the third day. When RVing off the grid it is all about replenishing consumed amphours back into your 12 volt reserves, takes a multi-pronged solution to be able to use your RV as if plugged into shorepower.

IDman

Oklahoma

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Posted: 07/29/21 07:05pm Link  |  Quote  |  Print  |  Notify Moderator

You are forgetting about the water pump, frig, electric jacks, electric awnings and levelers, and other 'mystery' draws. Plan on always having more lights on (bathroom, etc.)

You didn't say if you would be in mountains and if so, you'll run the furnace to warm up.

I would say one day and one night and your one battery will be drained.

Ed_Gee

Central Oregon coast

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Posted: 07/29/21 07:32pm Link  |  Quote  |  Print  |  Notify Moderator

I wouldn't think your GRP 24 wet cell battery would last the night if you use a furnace, watch TV, etc. it is not really a 'deep discharge' type battery if it has a cranking specification..... that is a dual purpose starting battery, at least. A true deep discharge RV batttery will not have auto connection posts sticking up nor will it have a cranking amp specification. A deep discharge battery will measure its capacity in Amp Hours.....
just my opinion. Your battery may well work for your needs if they are as minimal as you described....


Ed - on the Central Oregon coast
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theoldwizard1

SE MI

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Posted: 07/29/21 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

Sandia Man wrote:

Well, without investing in any of the aforementioned items my only guess is possibly charging your single battery with your vehicle daily to keep it from going dead by the third day.

You will never get your RV battery up to 100% just charging it off your vehicle. Vehicle charging systems just are not designed to do this.

Assuming your converter does a good job at charging (not all do) then you best answer is a small generator.

FYI, that marine battery is not a true "deep discharge battery". The only commonly available true deep discharge batteries are 6V golf cart batteries so you need 2 in series. The information you are missing is the amp-hour (Ah) rating. Your Group 24 battery has about 75 Ah. A pair of GC2 golf cart batteries is over 200 Ah.

dodge guy

Bartlett IL

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Posted: 07/29/21 07:47pm Link  |  Quote  |  Print  |  Notify Moderator

You can get a 200W solar kit off Amazon for around $250. Then I would get 2 matching batteries. 2 6V AGM golf cart batteries will last you awhile and offer more Ah.


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Daughter Marissa 16yrs
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