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Old 08-13-2019, 01:16 PM   #477
3rd one is the charm?
 
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Day 11 of a boondocking trip in Idaho and Montana. What a DELIGHT the 400 watt install (along with Trojan T 105s) has been. The controller turns on before the sun is even up, and the batteries are simply...always full. I can leave both FF’s on all day, no worries; used the tv/dvd player via inverter and ran heat one rainy night—hardly a dent in the SOC and by 8 am the controller is cranking amps into the batteries. Even in full overcast weather, I have positive amps flowing. What a game changer this is!
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Old 08-13-2019, 03:20 PM   #478
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Originally Posted by pcskier View Post
Day 11 of a boondocking trip in Idaho and Montana. What a DELIGHT the 400 watt install (along with Trojan T 105s) has been. The controller turns on before the sun is even up, and the batteries are simply...always full. I can leave both FFís on all day, no worries; used the tv/dvd player via inverter and ran heat one rainy nightóhardly a dent in the SOC and by 8 am the controller is cranking amps into the batteries. Even in full overcast weather, I have positive amps flowing. What a game changer this is!


Cool! Can you give more detailsówhat brand solar, inverter, charger, monitor? Did you install or hire someone? Thx
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Old 08-13-2019, 04:20 PM   #479
3rd one is the charm?
 
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Originally Posted by farafield View Post
Cool! Can you give more detailsówhat brand solar, inverter, charger, monitor? Did you install or hire someone? Thx

I started an install thread that I will be completing soon. The second or third post has my purchase list and prices.

Solar Install for 'The Aluminum Tent 3'
http://www.airforums.com/forums/f448/solar-install-for-the-aluminum-tent-3-a-197517.html
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Old 08-15-2019, 12:36 PM   #480
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Originally Posted by pcskier View Post
Day 11 of a boondocking trip in Idaho and Montana. What a DELIGHT the 400 watt install (along with Trojan T 105s) has been. The controller turns on before the sun is even up, and the batteries are simply...always full. I can leave both FF’s on all day, no worries; used the tv/dvd player via inverter and ran heat one rainy night—hardly a dent in the SOC and by 8 am the controller is cranking amps into the batteries. Even in full overcast weather, I have positive amps flowing. What a game changer this is!
Agree that 400W of solar and 230AH of batteries can provide all the power we need to live indefinitely off the grid. Run fantastic fans day and night, TV all day and evening, furnace day and night as needed, lights, pumps and all miscellaneous usage. It is a game changer for us too. Its like having perpetual battery power.
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Old 08-15-2019, 03:46 PM   #481
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Yup! As long as we don't need Air Conditioning, we can live off the grid indefinitely. Of course, we're headed back to Florida and it's still only August, so we clearly got a couple of wires crossed this season, but even then our system helps us driveway surf and air condition while drawing only 15 amps from our host.
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Old 08-15-2019, 04:38 PM   #482
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Yup! As long as we don't need Air Conditioning, we can live off the grid indefinitely. Of course, we're headed back to Florida and it's still only August, so we clearly got a couple of wires crossed this season, but even then our system helps us driveway surf and air condition while drawing only 15 amps from our host.


I have a DC fridge thatís draws 4.5 amps continuous, would 400 watts and 200 amp hours of lithium be enough?
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Old 08-15-2019, 04:49 PM   #483
3rd one is the charm?
 
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I have a DC fridge that’s draws 4.5 amps continuous, would 400 watts and 200 amp hours of lithium be enough?
That depends. that's 108 amps per 24 hours, so that's half your battery allotment without solar. I know that on my recent trip, doing a lot of testing, I put both fans on full speed, ran the stove vent (it's a hog), bath vent, turned on lights, drawing 6+ amps at least (I shut off the panels to get a read from the battery meter)...and my battery meter (after flipping panels back on) was still showing positive amps from the solar controller. So really, you'd likely start out with full batteries when the sun sets, and need 54 ah, or about 600 wh or so overnight to run your fridge. So you should be able to recover that and then some the next day.

This of course is all dependent on weather/sunlight and shade issues.
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Old 08-15-2019, 05:24 PM   #484
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I have a DC fridge thatís draws 4.5 amps continuous, would 400 watts and 200 amp hours of lithium be enough?

Is that a thermo-electric cooler? It doesn't have a compressor?

If so thermo-electric coolers are energy hogs. They work great in certain uses but boondocking might not be one.

Granted with enough Ah of battery and W's of solar it might be perfectly acceptable for you.

The compressor fridge variants seem to be much more frugal in this use.
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Old 08-15-2019, 05:37 PM   #485
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I have a DC fridge thatís draws 4.5 amps continuous, would 400 watts and 200 amp hours of lithium be enough?
I believe it could do it on sunny days with an occasional generator boost on overcast days. I think the Lithium batteries would be required so you get bulk charging until nearly full. Lead acids ( AGM and wet cell) have long inefficienct absorption fazes which would reduce the Amphours greatly. Iím certain 600W with Lithium would do it if you could get that much on your roof.
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Old 08-15-2019, 05:45 PM   #486
3rd one is the charm?
 
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Lead acids ( AGM and wet cell) have long inefficienct absorption fazes which would reduce the Amphours greatly.
Your comment ties in to a question I'm asking over on this thread:
http://www.airforums.com/forums/f448...gs-199479.html
My Victron controller has an absorption phase which I am able to set to the max voltage suggested by Trojan (14.82v); but that phase is always preceded by a 'bulk' phase from the Victron, which runs at more like 13.6v, which it runs before switching to the higher 'absorption' phase. But the Victron does not have a setting for 'bulk' phase that I can input. If it did, I would set it to 14.82v as well, since Trojan says to use 14.82 for absorption, which is their max. Would appreciate any comment you might have over on that thread!
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Old 08-15-2019, 08:32 PM   #487
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I believe it could do it on sunny days with an occasional generator boost on overcast days. I think the Lithium batteries would be required so you get bulk charging until nearly full. Lead acids ( AGM and wet cell) have long inefficienct absorption fazes which would reduce the Amphours greatly. Iím certain 600W with Lithium would do it if you could get that much on your roof.


We have 400 watts of solar, operate a compressor fridge that draws 50 watts and have 200 Ah of lithium. We just returned from an 11 day trip and were not able to keep everything charged without our small 1,000 watt generator. However, I was carrying a kayak on top and this reduced the solar output substantially, like by 2/3. One time with the kayak in place the solar output was 76 watts. When I removed the kayak the output immediately increased to 236 watts. With the kayak in place the maximum effective solar output is more like 130 watts. Our next trip will be without the kayak. I think we will be ok, but we will just have to wait and see.

Dan
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Old Yesterday, 11:16 AM   #488
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Is that a thermo-electric cooler? It doesn't have a compressor?



If so thermo-electric coolers are energy hogs. They work great in certain uses but boondocking might not be one.



Granted with enough Ah of battery and W's of solar it might be perfectly acceptable for you.



The compressor fridge variants seem to be much more frugal in this use.


Itís a Grape solar 5.5 Glacier fridge.
Operates on ac/dc but not a thermoelectric design, it has a compressor but I donít think it is a Danfoss
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Old Yesterday, 02:23 PM   #489
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Itís a Grape solar 5.5 Glacier fridge.
Operates on ac/dc but not a thermoelectric design, it has a compressor but I donít think it is a Danfoss
Interesting fridge, I had not seen one with that design, pretty cool but pricey best as I can tell at $700+.

I was just picking up on your 4.5 amp constant draw, is that accurate? I would think that is just the draw when the compressor was running but I have no idea really.
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Old Yesterday, 03:48 PM   #490
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That may be correct, I find out soon.
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