These Solar Generators Are So Confusing - Fiberglass RV


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Old 06-23-2021, 08:14 AM   #1
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These Solar Generators Are So Confusing

On the surface, this looks like a deal. With the coupon, its $359 for a 620 Wh unit.

Am I missing something?

The 300 Wh units are running about this price. I am a believer in you don't get something for nothing.

The watt outputs are more about the on board inverter, so I am more interested in the storage capacity. But I know just enough to be confused!! And not enough to click and buy.

My objective is to get a backup that my portable solar can charge, and run a 12V DC compressor fridge and a few LED lights in my Trillium.

https://www.amazon.com/dp/B08YRFLSR3...dDbGljaz10cnVl
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Old 06-23-2021, 08:19 AM   #2
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My trailer battery is the charger of things that need charging.

I was a bit worried while on my way to W. Oregon to dry camp. The weather report was for rain. I put out my solar panels anyway. I found that even on the overcast days, with sucker holes appearing briefly, the panels kept my battery charged up. It was a pleasant surprise. It didn't take much and even on the overcast parts, the readout showed a charge happening.
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Old 06-23-2021, 08:21 AM   #3
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Originally Posted by gordon2 View Post
Check your link.
Bill, You linked to this:
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Old 06-23-2021, 08:45 AM   #4
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Trying again.

https://www.amazon.com/Portable-Stat...ct_top?ie=UTF8
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Old 06-23-2021, 09:06 AM   #5
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That one is US$559 which seems to be inline with others.

https://www.amazon.com/dp/B07SM5HBK1/ref=emc_b_5_t

Was US$359 a type or a special price?
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Old 06-23-2021, 09:54 AM   #6
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Amazon is giving me a $200 coupon on it, making it $359.
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Old 06-23-2021, 10:43 AM   #7
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Originally Posted by thrifty bill View Post
Amazon is giving me a $200 coupon on it, making it $359.
It sounds legitimate then.
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Old 06-23-2021, 10:51 AM   #8
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a 620 Wh unit.

My objective is to get a backup that my portable solar can charge, and run a 12V DC compressor fridge and a few LED lights in my Trillium.
How much power does your refrigerator draw?

I've seen numbers between 7 Amps and 15 Amps.

Assuming (You know the saying...) it's running 50% of the time, that's between 3.5 and 7.5 Amps.

At 12 Volts, that's between 40 and 90 watts.

So you'd be able to power your fridge for between 8 and 3.5 hours to get your battery 50% depleted. (Which is what I understand is as far as you should go to get good lifetime out of a battery.)
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Old 06-23-2021, 03:55 PM   #9
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622 wh with an 80% discharge to protect the battery from over discharge leaves 497 watt hr for use.
497 watt hr is equivalent to 497 watts / 12.8 volts or about 40 amp hrs.
40 amp hours is not too bad considering that the DC compressor fridge will draw about 4 amps running and maybe 2 - 2.5 amp hrs if running ~50% duty cycle.
40 amp hrs available divided by 2.5 would give you maybe 16 hours of run time, if the specs are as I understand them.
The only worry I would have is if the reviewers are really buyers and users of the unit.
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Old 06-23-2021, 10:04 PM   #10
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Originally Posted by AlanKilian View Post
How much power does your refrigerator draw?

I've seen numbers between 7 Amps and 15 Amps....
they said they had a COMPRESSOR fridge. 7-15 amps is for an absorption fridge. Compressor fridges use far less power.
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Old 06-24-2021, 05:22 AM   #11
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Yes the plan would be to partner it with a compressor fridge, solar panel and regular battery.
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Old 06-24-2021, 06:58 AM   #12
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as long as you realize, a 'solar generator' is just a portable battery with a bunch of attached junk.
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Old 06-24-2021, 07:03 AM   #13
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Just to give you a idea, I run a Domenic CFX28 portable compressor fridge in my Honda Odyssey. It runs off the cigarette lighter plug in the back of the van. The "rated input current (DC), [A] 6.5" quoted from the manual. Never have had any problems with it killing the battery. Been running it for at least 3+ years now. It turns on when I start the van and off when not running. Leave it plugged in all the time.
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Old 06-24-2021, 07:16 AM   #14
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Originally Posted by John in Santa Cruz View Post
as long as you realize, a 'solar generator' is just a portable battery with a bunch of attached junk.


Yes, and for that you get one expensive battery! There is no free lunch.

Enjoy,

Perry
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Old 06-24-2021, 07:26 AM   #15
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Originally Posted by John in Santa Cruz View Post
they said they had a COMPRESSOR fridge. 7-15 amps is for an absorption fridge. Compressor fridges use far less power.
Well that's why I looked:
Dometic 3.8 cubic foot says 6.2 Amps
https://www.dometic.com/en-us/food-a...crx-110e-56279

You are right that the 15 Amp draw was 12 Volts on a three-way fridge so that was my problem. Sorry.

Do you have a reference I can look at showing compressor fridges drawing "far less than" 7 Amps? I've LOVE to find something like that and I'm not the best google searcher. Thanks.
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Old 06-24-2021, 07:49 AM   #16
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Originally Posted by AlanKilian View Post
Do you have a reference I can look at showing compressor fridges drawing "far less than" 7 Amps? I've LOVE to find something like that and I'm not the best google searcher. Thanks.
Are you looking for built in or portable?

Built in:
https://static1.squarespace.com/stat...+2021+-+R3.pdf
http://www.marinewarehouse.net/image...atalog-USA.pdf
https://truckfridge.com/products/ac-...mercial-trucks

Search on Amazon for portables. You have to look through the listing to see power consumption:

https://www.amazon.com/s?k=portable+..._ts-doa-p_8_19

Not a complete list but it will get you started. Can you tell I have been looking? I'm probably going to get a NovaKool R-3100 for my trailer once I rewire it.
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Old 06-24-2021, 07:53 AM   #17
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https://www.northernfridge.ca/pages/faq suggests the *average* usage is 2 AH per hour.

specs on a 3 cu ft tall fridge from that maker suggest its actual usage is 5 amps while on.
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Old 06-24-2021, 09:22 AM   #18
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Originally Posted by AlanKilian View Post
..

Do you have a reference I can look at showing compressor fridges drawing "far less than" 7 Amps? I've LOVE to find something like that and I'm not the best google searcher. Thanks.
My portable Indel B (Same as Truckfridge and others), draws between 220 and 900 watt hours in 24 hours. 900 is with it set to freezing. The typical number if you dont open it a lot and the ambient temperature is close to room temp would be 250-300 watt hours a day.
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Old 06-24-2021, 09:26 AM   #19
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Originally Posted by gordon2 View Post
My portable Indel B (Same as Truckfridge and others), draws between 220 and 900 watt hours in 24 hours. 900 is with it set to freezing. The typical number if you dont open it a lot and the ambient temperature is close to room temp would be 250-300 watt hours a day.
so thats between 18 and 75 amp*hours per day, or 0.75 to 3.2 amp*hours per hour.
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Old 06-24-2021, 09:33 AM   #20
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Originally Posted by gordon2 View Post
250-300 watt hours a day.
What does 300 watt-hours per day mean?

https://www.goalzero.com/blog/what-is-a-watt-hour/
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