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Old 08-08-2018, 04:03 PM   #1
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How much generator do I need?

My wife and I are going on a three week road trip in our travel trailer. We will not have access to 120 v shore power. We have two 12 volt batteries size 24 that easily give us 3 to 4 days of power. We don't need to run ac's, tv's or microwaves. How large of a generator do we need to recharge the batteries? Would a Ryobi 900 w propane generator be enough to recharge the batteries? How long would it take to recharge batteries that are half discharge? They are both 690 amp each.
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Old 08-08-2018, 04:07 PM   #2
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what size converter do you have? that will be the limiting factor on how fast they can charge.

I doubt if and TT comes stock with a converter that would need more then that generator
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Old 08-08-2018, 05:02 PM   #3
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llr; My converter is a WF89PEC, converter output 12 amp, 950 w. Also says output 55 amp charging and load. Wouldn't I be limited by the generator output; 900 w peak, 700 w continuous? Trailer came with a 30 amp extension cord.
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Old 08-08-2018, 05:12 PM   #4
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batteries take time to recharge using the stock converter in the trailer, even longer since you have two 12 V in parallel...

you could start with that genny, but I would buy a separate 8 amp smart battery charger and hook the output of the genny to the batteries via the charger...

Personally I would get the Predator HF 2000 watt genny for about $450 on sale. It may be even quieter then what you are looking at meaning you could be running it overnight to get fully recharged because it is not loud at all.
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Old 08-08-2018, 05:24 PM   #5
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rsdata; Thanks for the reply. Today I looked at the predator genny at Harbor Freight today. I've heard good stories about it. It's also big, heavy and requires packing gasoline. I can carry up 80 # of propane (2 @ 30# and and 1 @ 20#) so I would like to stick with propane. I like the idea of a separate 8 amp charger to bypass the trailer converter. I think the 700 watt Ryobi is only capable of 5.8 amps anyway.
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Old 08-08-2018, 05:39 PM   #6
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rsdata; Thanks for the reply. Today I looked at the predator genny at Harbor Freight today. I've heard good stories about it. It's also big, heavy and requires packing gasoline. I can carry up 80 # of propane (2 @ 30# and and 1 @ 20#) so I would like to stick with propane. I like the idea of a separate 8 amp charger to bypass the trailer converter. I think the 700 watt Ryobi is only capable of 5.8 amps anyway.
The Predator 2000 is big and heavy? Itís 55lbs full of fuel, and will run 8 hours on a full tank. No need to pack much spare gasoline.
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Old 08-08-2018, 05:56 PM   #7
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I think I am correct in saying that a 20# propane cylinder only gives about an 8 hour run-time... about the same as about 1.5 gallons of gas, and that propane does not give full output as the BTU or energy in propane is less than gas...

I think a full 20# cylinder is about 4.7 gallons of LP... those Blu-Rhino cylinders you return are even less...

I think the illustration I found below should rate the propane at 3.44 POUNDS per hour not GALLONS... but I do believe the 8 hr ( give or take an hour) per 20# tank is correct...
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Old 08-08-2018, 06:11 PM   #8
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Quote:
Originally Posted by malcolmjwhitaker View Post
My wife and I are going on a three week road trip in our travel trailer. We will not have access to 120 v shore power. We have two 12 volt batteries size 24 that easily give us 3 to 4 days of power. We don't need to run ac's, tv's or microwaves. How large of a generator do we need to recharge the batteries? Would a Ryobi 900 w propane generator be enough to recharge the batteries? How long would it take to recharge batteries that are half discharge? They are both 690 amp each.
Quote:
Originally Posted by malcolmjwhitaker View Post
rsdata; Thanks for the reply. Today I looked at the predator genny at Harbor Freight today. I've heard good stories about it. It's also big, heavy and requires packing gasoline. I can carry up 80 # of propane (2 @ 30# and and 1 @ 20#) so I would like to stick with propane. I like the idea of a separate 8 amp charger to bypass the trailer converter. I think the 700 watt Ryobi is only capable of 5.8 amps anyway.
You should check into a solar panel on your roof. One or two 100 watt panels would recharge your batteries without fuel or noise & produce 5-10 amps all day. You do not need a large solar system if have low power needs. You can also deduct 30% of solar cost off your taxes for 2018. My solar panels generate power even when it is raining.

Original question: Yes. The 700 watt Ryobi should be large enough. Your 24 batteries are 690 Cranking Amps with 140 Amp Hour Reserve Capacity. At 50% you would have 70 Amp hr per battery left.
Interstate Batteries: SRM-24
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Old 08-08-2018, 06:46 PM   #9
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rsdata; 20# propane = 366,000 btu. 1 1/2 gal gasoline = 171,00 btu. Therefore, 20 # propane = 3.2 gal gasoline. Home Depot claims 700 watts Ryobi will go for 15 hours on 20 # propane.
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Old 08-08-2018, 06:57 PM   #10
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rfk06382; I agree that solar panels on the roof would be the ideal solution. My trailer is pre-wired for Zamp solar panels but these can only be used while stationary. I am considering this avenue. Not ready to make holes in the roof for permanently mounted panels.
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