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Old 02-03-2019, 11:33 AM   #15
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Thanks for all the great responses!

To be clear, I would only ever try to run the AC with the generator running. So, even at startup, with the generator providing 2000w of that power, less than 1000w would have to come from the batteries. Even basic batteries should be able to handle that ~80A load for the few seconds until it settles down, no?

I will definitely look into consolidating the grid to function like this.
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Old 02-03-2019, 11:45 AM   #16
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Can everything, including the AC, be wired to run off the batteries?

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Originally Posted by Lindenwood View Post
Thanks for all the great responses!



To be clear, I would only ever try to run the AC with the generator running. So, even at startup, with the generator providing 2000w of that power, less than 1000w would have to come from the batteries. Even basic batteries should be able to handle that ~80A load for the few seconds until it settles down, no?



I will definitely look into consolidating the grid to function like this.


You need a hybrid inverter to do this along with some proper batteries (not the interstates that come from the factory). I use the Victron multiplus 3000 hybrid inverter and do this all the time (supplement 8-12A of shore power from a small gender or household outlet with battery power. Your main 15k AC will pull over 1700 watts when running. This approach (hybrid inverter) Works like a champ, especially if you have a large solar array.

I can also run my AC off batteries alone for 2-3 hours.

Like most of us who run the AC of limited power supplies you will want to install an easy start computer controlled soft starter, which dramatically reduces current draw from the compressor on startup.

Lewster did my inverter / batter / solar install. Highly recommend his services.

Here are the full details:

http://www.airforums.com/forums/f539...um-182406.html
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Old 02-03-2019, 11:54 AM   #17
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Originally Posted by wulfraat View Post
You need a hybrid inverter to do this. I use the Victron multiplus and do this all the time (supplement shore 10-15A of shore power from a small gender or household outlet with battery power. Works like a champ.

I can also run my AC off batteries alone for 2-3 hours.

Lewster did my install. Highly recommend his services.

Here are the full details:

http://www.airforums.com/forums/f539...um-182406.html
Wow! That is quite the setup!
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Old 02-03-2019, 05:26 PM   #18
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Lewster did mine. 3000w, magnum, 800w solar, and 600ah lithium. We really enjoy being grid independent. Add a compost toilet and never need hook ups. Excellent equipment, installation, and service.
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Old 02-03-2019, 08:25 PM   #19
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Can everything, including the AC, be wired to run off the batteries?

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Originally Posted by mykytiukr View Post
Do a search on YouTube for “Solar RV Airconditioning”. There are many many videos of people doing exactly what you are asking about. There is one where a guy is using a small window AC that starts with about 1000 watts and runs a about 500.


I have a thread titled “5,000 btu/hr AC and 1,000 W Genny” and dated 5/16/12. I have a 5,000 btu/hr Frigidaire AC unit that is similar to the one you are referring to. My unit looks identical but is just not quite as efficient as it is an older model. It requires 465 watts versus 440 watts. I can operate this unit using my 1,000 watt generator or can operate it for a minimum of 4 hrs using the two BB Lithium batteries I have installed. This works well for us when we need AC. This is a nice unit and is very quiet.

Below is a photo of the “power plant”. It feeds the main panel box and operates all the 120 volt equipment.

Dan

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Old 02-03-2019, 08:28 PM   #20
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Get a generator to run the A/C... Or a lot of fans!
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Old 02-03-2019, 09:01 PM   #21
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Thanks, everyone! Sounds like I really need to get a hold of this Lewster guy, heh.

Very generally speaking, how much work would it be to change a new-model airstream to run all the electronics off the same "grid," as discussed? Id love to be able to operate everything off the same grid, and just manage my own consumption depending on available power (i.e. shore power vs generator power vs battery-only).
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Old 02-03-2019, 09:35 PM   #22
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Boosting electrical power for AC through a hybrid inverter

Having just done some test runs today for a newly installed solar/battery/inverter system I can agree with a bunch of the comments and provide some hard numbers taken from my system this evening.

The TT is a 2015 Landyacht with dual ACs. Victron 3000 hybrid inverter and a bunch of batteries and solar panels. A wonderful technician (Cameron Belsher) installed all the equipment and it appears to do exactly what was specd. I do not have easy starts installed on either AC unit.

With no shore power connected, we tested to see if the inverter could start one AC and operate it... no problem. It was difficult to read the peak draw, but steady state was about 1700 watts.

Just for fun we tried running the second AC through the inverter at the same time. It worked... for about 30 seconds before they inverter “faulted” and kicked off.

When plugged into 30 Amp shore power the hybrid inverter easily ran both AC units and only pulled from the batteries when both compressors were running.

This system provides a couple of benefits... a) if not connected to shore power AND insufficient solar generation to maintain the batteries, I can use my 1000 watt CarGenerator (really nice product) to maintain battery levels, and b) I can ditch the >25lb 50 amp cable that takes up a ton of space. It was only a slightly expensive way to shed that power cord :-)

If anyone wants more details, feel free to ask specific questions, though I think my system is similar to the other hybrid inverter installs.

Matt
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Old 02-03-2019, 09:39 PM   #23
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Oh, and pass-through...

Forgot to mention that my 2015 LandYacht did NOT have pass through shore power to the inverter outlets as wired from the factory. Which meant having to run the inverter to use any of the electronics even when connected to shore power. Getting that “fixed” with the new install is a nice upgrade too.
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Old 02-04-2019, 03:25 AM   #24
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About how much did you guys spend on these major electricsl upgrades? They look like 15-20k jobs, no?
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Old 02-04-2019, 11:31 AM   #25
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Lewster - desperately seeking Lewster

Naples (Moorings) here with 2017 basecamp - that i need solar help with to try to fix refrig problems

there are several threads on basecamp refrig problems - a solution taken is to go to compressor type 2-way which i would like to do - i have solar panels installed by AS - but want to make sure they are adequate - theres no inverter - and would need a battery update - and guessing updated controller (have seen those being replaced)

would like to get advice - in fact would like to meet and talk about and get your thoughts

thanks Reid
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Old 02-04-2019, 01:17 PM   #26
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HI Reid,

Please contact me at 4rvsolar@gmail.com so we can start this conversation.

Thanks!
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Old 02-04-2019, 01:18 PM   #27
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Quote:
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About how much did you guys spend on these major electricsl upgrades? They look like 15-20k jobs, no?
Hi Lindenwood,

If you are interested in a solar power system, please contact me at: 4rvsolar@gmail.com so that we can have a discussion.

Thanks!
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Old 02-04-2019, 02:03 PM   #28
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Can everything, including the AC, be wired to run off the batteries?

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Originally Posted by Lindenwood View Post

About how much did you guys spend on these major electricsl upgrades? They look like 15-20k jobs, no?


Give Lew a call....
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