More Solar/Generator

Submitted: Tuesday, Aug 05, 2008 at 22:38
ThreadID: 60521 Views:4949 Replies:4 FollowUps:13
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Hi Guys

Am in the process of buying a caravan, and have been told that I should consider using a Generator rather than solar, because solar wont run the a/c.

I have just read the ThreadID: 59742 and was interested in what was being discussed. However, it appears that most of the discussion was about Camper Trailers and their use of solar/gennies.

Most of the gear in the van will run on solar or gas, but what about the air con if you are camped in the bush away from a powered site, or in a national park where apparently, gennies are banned.

I think I know the answer, however would be interested in some learned comment.

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Reply By: Member - Redbakk (WA) - Tuesday, Aug 05, 2008 at 22:57

Tuesday, Aug 05, 2008 at 22:57
Check out Collyn Rivers webb site.....it will provide you with all the best answers.

http://www.caravanandmotorhomebooks.com/books/index.htm

But you will need both to be able free camp successfully.
AnswerID: 319281

Reply By: ozwasp - Wednesday, Aug 06, 2008 at 00:04

Wednesday, Aug 06, 2008 at 00:04
You're right.... A generator is the best way to go, as solar is too ineffective

AnswerID: 319287

Follow Up By: Mainey (wa) - Wednesday, Aug 06, 2008 at 00:38

Wednesday, Aug 06, 2008 at 00:38
Unfortunately if you only have a generator you can't go into National Parks and expect to use generators in there.

So you are therefore banned from seeing some the best places because our Government has made them into National Parks.

Quality Solar systems are not ineffective, cheap ones are !!

Mainey . . .
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FollowupID: 585855

Follow Up By: Member - Norm C (QLD) - Wednesday, Aug 06, 2008 at 07:50

Wednesday, Aug 06, 2008 at 07:50
Ozwasp, your statement that solar is too ineffective is a big rash (what I really mean is wrong). As Mainey says, only cheap / badly set up systems are ineffective.

We don't currently have solar, but soon will as, like you, we are currently in the process of getting a van. We have travelled for 4 to 6 moths a year for the last 3 years in a CT.

From our experience, observation and many long, detailed conversations with long term vanners:
- for independant camping, you need both solar and a gennie / 3 stage charger
- most people rarely use their A/C on the gennie, but it can be handy when the temp outside gets into the high 30s / 40s.
- Many long term vanners with good solar systems can go for months without running their gennie
-As well as not being able to use a gennie in NPs, to regularly rely on one for bush camping near other people is asking for trouble. They can generate al lot of heat at times (and I don't mean from the gennie motor / exhaust)

We already have a 2KVA generator and will have the van set up with at least 3 x 130W solar panels and 3 x 100 to 120 AH AGM batteries. You could get away with a smaller system if you have a gas fridge - we won't.

Although a good solar system is not cheap, nor is fuel to run the gennie. You pay for the solar system once, but fuel is on the never never plan the cost never, never stops.

My view anyway.

Norm C
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FollowupID: 585860

Follow Up By: Honky - Wednesday, Aug 06, 2008 at 10:21

Wednesday, Aug 06, 2008 at 10:21
Most Air conditioners that I know of would use more than 1.5kva which would be around 120 amps per hour at 12 volt.
I am sure solar would have no trouble in handling this.

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FollowupID: 585896

Follow Up By: bruce - Wednesday, Aug 06, 2008 at 10:58

Wednesday, Aug 06, 2008 at 10:58
Honky..if you take 120 amps per hour out of your battery system to run the aircon , just how many solar panels do you think you will need to replace this power ?...my rough guess is about 10 putting out 12 amps per hour each on nice warm sunny day...cheers
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FollowupID: 585906

Follow Up By: Mainey (wa) - Wednesday, Aug 06, 2008 at 12:20

Wednesday, Aug 06, 2008 at 12:20
Bruce,
can answer your question in a different way ?

When using a well designed quality Solar Power System, and why would you use anything else, you don't actually take the "amps per hour" out of your battery system (during the day) power is supplied direct by the Solar system - not the battery system, as it remains fully charged, so it only has to power the auxiliaries at night.

Image Could Not Be Found

As a worse case scenario, the Solar System supplies the power available and only the balance is taken from the fully charged battery system

Mainey . . .
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FollowupID: 585918

Follow Up By: Member - Matt M (ACT) - Wednesday, Aug 06, 2008 at 17:49

Wednesday, Aug 06, 2008 at 17:49
Mainey,

You're right of course. But I would still like to see a portable solar setup that can provide 120 amps per hour! I think that was Bruce's point.

Matt.
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FollowupID: 585975

Follow Up By: Pajman Pete (SA) - Wednesday, Aug 06, 2008 at 20:10

Wednesday, Aug 06, 2008 at 20:10
We take a gennie as well as our solar setup - on a recent trip we didn't see the sun for a week of heavy clour and rain and no solar setup will work then.

The gennie doesn't get much use, but ocasionally it is essential.

Pete
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FollowupID: 586016

Follow Up By: bruce - Wednesday, Aug 06, 2008 at 21:28

Wednesday, Aug 06, 2008 at 21:28
That is right Matt M...I would/could not imagine a portable solar system as used in travelling being able to supply enough power to run an airconditioner in a caravan...like was quoted ...120 amps per hour....what you take out of a battery system has to be put back in by some means and imho solar power...good as it is..is not viable in that scenario...cheers
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FollowupID: 586038

Reply By: DIO - Wednesday, Aug 06, 2008 at 08:56

Wednesday, Aug 06, 2008 at 08:56
To maintain harmony with fellow campers and avoid unecessary conflicts regarding noise and smell, leave the gennie in the box. The environment will love you too ! Surely you can survive whilst on holidays without air conditioning. Have you tried a couple of electric fans - running off the batteries. It's amazing how much relief from heat they can provide - without all the NOISE.
AnswerID: 319309

Follow Up By: xtragrouse - Wednesday, Aug 06, 2008 at 10:20

Wednesday, Aug 06, 2008 at 10:20
Hi DIO

I didn't mention that I am leaving home :-)

I intend living in the caravan and touring for the rest of my life (or until my health forces me to give up). Therefore my concerns re a/c
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FollowupID: 585895

Reply By: Gronk - Wednesday, Aug 06, 2008 at 12:38

Wednesday, Aug 06, 2008 at 12:38
Am in the process of buying a caravan, and have been told that I should consider using a Generator rather than solar, because solar wont run the a/c.




As for the question above, it is correct, unless you have a solar power station, you will need a gennie..

But instead of using the gennie too much, choose your camps to suit the weather and temps and drink more beer !!!!
AnswerID: 319342

Follow Up By: Mainey (wa) - Wednesday, Aug 06, 2008 at 13:05

Wednesday, Aug 06, 2008 at 13:05
The link below shows some *specialist* brands of caravan AIR CONDITIONERS draw just 6.1 Amps to produce a Nominal cooling capacity of 3.5kW

( my fridge draws more than that )

Link to caravan AIR CON systems

Mainey . . .
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FollowupID: 585921

Follow Up By: Honky - Wednesday, Aug 06, 2008 at 14:06

Wednesday, Aug 06, 2008 at 14:06
That 6.1 amps is at 240v.
240X6.1=1464 Watts
1464 watts / 12 volt = 122 amps 12 volt
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FollowupID: 585934

Follow Up By: Mainey (wa) - Wednesday, Aug 06, 2008 at 14:10

Wednesday, Aug 06, 2008 at 14:10
woops,
I did not mention it runs off an inverter

Mainey . . .
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FollowupID: 585935

Follow Up By: neil&brenda - Wednesday, Aug 06, 2008 at 21:44

Wednesday, Aug 06, 2008 at 21:44
I seem to remember that for every 100 watts ac demand there is approx. 9 amp d.c draw. How does that calculate out for your inverter? About 162 d.c amps? Call me old fashioned, but, yeah, right! I can only imagine the size of the inverter you use!!
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FollowupID: 586042

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