diy solar

diy solar

Hybrid trailer build

Brewman

Brewman

Solar Enthusiast
Joined
May 16, 2020
Messages
511
Well I went and did it, I showed off my little milk crate system to my brother in law and he said "Oh that's cool, now you can build a system for my new trailer I'm having built." What he is having built is a 24 foot trailer with a 8.5'x12' enclosure on it. What he wants is indoor/outdoor lighting, a small water pump for a small sink, some charging ports and AC for a 5000 BTU air conditioner, and small TV.

He also has a generator so a way to charge the batteries when on generator would also be needed.

As for panels, I may get some of the used 250W & 370W panels Will has on his site if I can arrange them correctly on the roof with its air vent. I'd like to get at least 850 watts up on the roof if possible.

I hadn't planned on building any batteries until I got my own camper so I need to do a crash course on them and find a good supplier with decent shipping.

If anyone has built any system like this I would love links to your build.

The trailer will look something like this.

solar traler.jpg
 
What does "hybrid" mean in this context?
Its my pet peeve ;)
 
we call those crawler haulers where i 4x4.... Nice project!
go on pirate 4x4 there are tons of build threads.

most will be very diy
 
After making some cutouts for scale I determined I can put 4 250W panels on the roof in a 2S2P configuration. Each panel has a VOC of 37.6V so the two together would be a VOC of 75.2 V which is low enough to work with the EPEVER 4210N.

Am I correct on this?

Dan
 

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  • 2S2P.jpg
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AND I just find out his son in law is getting the same trailer and wants the same size system installed, more building fun for me.

Now for batteries, I plan on making my own using Wills link to the 280Ah cells. Ill get 8 for each system and make a 24V battery.
 
diysolarforum.com

Another Cargo Trailer setup.

This is now officially a legitimate sickness. My 4th off-grid system: The players: This setup is actually cheaper than going with a PWM Hybrid all in one unit 48V unit. I have AC input to charge the 48V batteries with shore power. (The 21.99 charger) A way more than I will use MPPT battery...
diysolarforum.com diysolarforum.com
 
So it's all finalized I hope. Now to put it all on paper and work out the nuts and bolts.

The major parts are:

24V 272Ah battery
8S 24V BMS from Overkill
Tracer 4215BN with MT50
4 SanTan T Series 250W panels 1000W total
Giandel 24V 2000W PSW inverter

I ordered the batteries last month in the group thread and will be ordering the rest of the equipment soon.

I'll be making up a schematic soon to show fusing and wire sizing.
 
When my cells arive I plan on top balancing them and do a capacity test on each cell. I have a capacity tester on the way but my power supply is lacking. The one I have is a 30V 10A but it only has a voltage adjust and no amp reading. I could set it to 3.65V but wouldn't know when it was at or near zero without some other meter.
 
What would be the best way to charge up if I have shore power, just a power supply or get an inverter charger?
 
Brewman said:
Which ones work with lithium batteries?
Click to expand...

The ones that say they do.
rotfl3.gif


I don't know! Victron works with LiFePO4. Xantrex probably.
 
Brewman said:
Which ones work with lithium batteries?
Click to expand...
Most of the inverter/chargers give you granular control of the charge profile and low voltage disconnect.
This is a great reason for getting one that is not commonly known it seems.
Plus you get the automatic transfer switch to boot.
 
I'm also tossing around the idea of putting the PV input the SCC on a one foot anderson connector and swap between the panels and Power supply for shore charging. Seems the cheapest way to go. All manual but for the amount of times it will be needed seems like it could work. Maybe a 48v 10A.

This way they will never be connected together at the same time.
 
OK, update time...

Now that I have my tracking numbers for my battery cells Ive ordered the rest of major components for this build. Items listed a few posts above.
I've added a Moes ATS to the system and hope to add a power supply to the design soon for shore charging.

Please check out my schematic below and let me know if you see any problems. I have a ? between the PV and SCC, not sure what to put if needed.
I will also be adding in two shunts but they are not in the design yet.
24V system schematic.jpg
 
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