Track weekend trailer/mobile solar generator.

Gschuld

New Member
I’m considering a modest “off grid” trailer for use at 6-7 race events per year for vintage motorcycle road racing.

assuming no power available trackside(normal), I’m contemplating something like:

4 Rolls 6volt L16 batteries in 24volt configuration.
3 Longi 310 watt solar panels
1 all in one Hybrid solar converter/charger of suitable capacity

my events generally require 3-4 overnight stays in the trailer(6x14, moderately well insulated) and often hot days with some hot evenings and occasional cold evenings. Worst case scenario is 85 degrees plus with humidity overnight. Most events are 10plus hours drive from home.

FWIW, I’m primarily of northern Scandinavian decent, and my body reacts poorly over 85 degrees. In high heat I sweat at a ridiculous rate while most people are far less effected. Cold weather, no problem. It’s a common theme with my extended family.

so I’m lookin at a modern inverter type air conditioning unit at 8000btu.

specifically a Midea U MAW08 VIQWT

A technical reviewer reported it consumes on various settings

530 watts at 8000btu
380 watts at 5800btu
285 watts at 4300btu
190 watts at 2800btu
160 watts at 2400btu on its lowest setting (and near silent)

As reference, an experiment I read showed a 24 volt bank of 4 used Trojan L16 320@5hr batteries ran a 2012 vintage Kenmore 253.79081 8000watt window AC on full power for 4 hours off a Xantrex 1000 watt sine wave inverter using 550 watts continuous and reported to consume 30-35% of battery power, and elected not to run it down to 50%

I’m assuming at night, bringing 85 degree OAT down to 70-72 degrees will consume on average closer to the 190watts at 2800btu(greatly depending on quality of insulation). If …that is the case, I should be able to run the AC for around 12 hours off a bank of 4 fully charged Rolls 6v batteries at 24 volts and be only down 30-35 percent from full. Sound reasonable?

I’m hoping the 930 watts of solar can produce around 650-700watts in reality mounted horizontally on the roof of the trailer on a sunny day. Even if the AC consumed 380 watts for 5800btu during the day, the 650-700 watts of solar charging should easily handle this and recharge the batteries to full again by night fall. With some power to spare I’d hope.

Am I in the right ballpark here?
 
Last edited:

Gschuld

New Member
I’m considering a modest “off grid” trailer for use at 6-7 race events per year for vintage motorcycle road racing.

assuming no power available trackside(normal), I’m contemplating something like:

4 Rolls 6volt L16 batteries in 24volt configuration.
3 Longi 310 watt solar panels
1 all in one Hybrid solar converter/charger of suitable capacity

my events generally require 3-4 overnight stays in the trailer(6x14, moderately well insulated) and often hot days with some hot evenings and occasional cold evenings.
worst case scenario is 85 degrees plus over night. Most events are 10plus hours drive from home.

FWIW, I’m primarily of northern Scandinavian decent, and my body reacts poorly over 85 degrees. In high heat I sweat at a ridiculous rate while most people are far less effected. Cold weather, no problem. It’s a common theme with my extended family.

so I’m lookin at a modern inverter type air conditioning unit at 8000btu.

specifically a Midea U MAW08 VIQWT

A technical reviewer reported it consumes on various settings

530 watts at 8000btu
380 watts at 5800btu
285 watts at 4300btu
190 watts at 2800btu
160 watts at 2400btu on its lowest setting (and near silent)

As reference, an experiment I read showed a 24 volt bank of 4 used Trojan L16 320@5hr batteries ran a 2012 vintage Kenmore 253.79081 8000watt window AC on full power for 4 hours off a Xantrex 1000 watt sine wave inverter using 550 watts continuous and reported to consume 30-35% of battery power, and elected not to run it down to 50%

I’m assuming at night, bringing 85 degree OAT down to 70-72 degrees will consume on average closer to the 190watts at 2800btu(greatly depending on quality of insulation). If …that is the case, I should be able to run the AC for around 12 hours off a bank of 4 fully charged Rolls 6v batteries at 24 volts and be only down 30-35 percent from full. Sound reasonable?

I’m hoping the 930 watts of solar can produce around 650-700watts in reality mounted horizontally on the roof of the trailer on a sunny day. Even if the AC consumed 380 watts for 5800btu during the day, the 650-700 watts of solar charging should easily handle this and recharge the batteries to full again by night fall. With some power to spare I’d hope.

Am I in the right ballpark here?
I’m considering a modest “off grid” trailer for use at 6-7 race events per year for vintage motorcycle road racing.

assuming no power available trackside(normal), I’m contemplating something like:

4 Rolls 6volt L16 batteries in 24volt configuration.
3 Longi 310 watt solar panels
1 all in one Hybrid solar converter/charger of suitable capacity

my events generally require 3-4 overnight stays in the trailer(6x14, moderately well insulated) and often hot days with some hot evenings and occasional cold evenings.
worst case scenario is 85 degrees plus over night. Most events are 10plus hours drive from home.

FWIW, I’m primarily of northern Scandinavian decent, and my body reacts poorly over 85 degrees. In high heat I sweat at a ridiculous rate while most people are far less effected. Cold weather, no problem. It’s a common theme with my extended family.

so I’m lookin at a modern inverter type air conditioning unit at 8000btu.

specifically a Midea U MAW08 VIQWT

A technical reviewer reported it consumes on various settings

530 watts at 8000btu
380 watts at 5800btu
285 watts at 4300btu
190 watts at 2800btu
160 watts at 2400btu on its lowest setting (and near silent)

As reference, an experiment I read showed a 24 volt bank of 4 used Trojan L16 320@5hr batteries ran a 2012 vintage Kenmore 253.79081 8000watt window AC on full power for 4 hours off a Xantrex 1000 watt sine wave inverter using 550 watts continuous and reported to consume 30-35% of battery power, and elected not to run it down to 50%

I’m assuming at night, bringing 85 degree OAT down to 70-72 degrees will consume on average closer to the 190watts at 2800btu(greatly depending on quality of insulation). If …that is the case, I should be able to run the AC for around 12 hours off a bank of 4 fully charged Rolls 6v batteries at 24 volts and be only down 30-35 percent from full. Sound reasonable?

I’m hoping the 930 watts of solar can produce around 650-700watts in reality mounted horizontally on the roof of the trailer on a sunny day. Even if the AC consumed 380 watts for 5800btu during the day, the 650-700 watts of solar charging should easily handle this and recharge the batteries to full again by night fall. With some power to spare I’d hope.

Am I in the right ballpark here?
Another aspect of my interest is in the potential use as a plug in solar generator for the house. Where I live we VERY rarely lose power. Generally only coastal storms(NJ), and big ones. We are currently building a new house with 1800 sqft of living space. Well insulated, top quality energy efficient windows and doors, equipment etc. I understand these all in one hybrid converters can be plugged into a house and designated to run certain functions. I’d be looking at refrigerator, some lights(LED), fan for air handler, etc.

With those inverters, the loads can feed directly of the solar. If the load becomes to great for the solar output, it automatically switches to grid power, or battery backup if asked.

Its not a typical grid tie system in that excess solar is “sold” back to the electric company, so my understanding is that such a system is not requiring any permits or inspection like a roof mounted grid tie solar setup.

The overall idea is to have the solar system, and backup batteries, serve a function during the 95% of the time when I am not traveling. And when traveling, grid system takes care of it.

3 310watt panels are not capable of providing much useful power to the house, but it’s something. The critical needs backup service is valuable enough.

I could potentially use a larger capacity hybrid solar charge inverter and lay out the trailer to carry more panels, up to 2400 watts or so at the most with a fold out or sliding panel array. Panel weight starts to add up though at some point.
 

feo

Solar Enthusiast
good luck with your build. i dont have answers to your questions other than "looks intriguing "

how do you plan to mount the weirdly shaped midea? is there a window? will you cut a window sized hole and re-patch?
 

Gschuld

New Member
There are several ways to mount it. But I would likely build a sound dampened panel that surrounds the window U section, overlapping the sides, and under the unit in the same plane to create a mounting flange that would insert into a cavity in a bulkhead. The backside is open to the outside (fwd and below) while the inside section is exposed to the interior. This retains the extra low sound levels of this design and keeps everything out of sight and weather exposure. There are some complicating factors not important to the solar/AC subject that limits my placement.

George
 
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