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Just some real word experience: I am running a 3000lb sailboat with an 80lb thrust motor for up to 10 hours (longest run time yet) on a 100Ah 24v battery (2/5 to 4/5 throttle is the norm). For a quick and dirty answer, I would think a boat that weighs less than half mine, pushed by a motor...

About 30 years of unlearning to be precise. The biggest hurtle has been remembering that the batteries themselves are "smart" (unless you are talking about raw cells) and having to pay close attention to what the *battery* is expecting to see in terms of load and charge current.

💡💡💡Proportional💡💡💡 Thanks @42OhmsPA @Steve_S @Brett V and @Brucey - the fog is lifting and this clears up the gap in my understanding that was giving me trouble in planning my own configuration for my shop. (I hope this discussion is helping @Stotts47 as its helping me.)

So... you are saying if the 6-pack (as a whole) and the PowerPro are correctly connected to the small buss with the same length/resistance of wire, they will CHARGE correctly even though the PowerPro is likely to be flat when the 6-pack is still likely over 50% capacity? Does that mean you can...

:unsure: That looks like a balancing nightmare. The 280 will be flat before the 600 (and if I'm not mistaken, the system will act like a 600 and a 280) and charging will be just as wonky.

(NOTE: I wrote this before SigSol responded, but I think its still pertinent to the discussion.) So lets talk about what goes one with a rack mount battery: In terms of circuit logic, the batteries connected to the buss bars are ONE BATTERY. The "rack" is a framework to support the batteries...

The SWMBO Factor. Always interesting.

This alone could probably handle it for 12hrs MINIMUM: Eccoflow River 2 Pro I haven't done a refrigerator test, but it ran my pellet stove quite well on a test last winter. (I may try it if I get time this weekend with my shop full size 15 year old refrigerator.)

Ok, so are you planing to: 1) Live aboard? Solo? Couple? Family? 2) 2-3 days out of port? 3)1-2 weeks out of port? 4) I'm sailing away, set an open course for the virgin sea, cause I've got to be free, free to face the life that's ahead of me..... (and are you old enough to get that...

Not sure what size boat this is, but 8 400wt panels will cover about 170-190 sq ft. Will also weigh about 400lbs plus panel mounting hardware. And an alternator is not going to supply more than limited "boost" to this system. If you have room for that many cells, you likely have room for a...

Sorry if we drug this out. We just don't want to see your batteries die needlessly at an inopportune moment.

So here is what I have learned from the links in this discussion and further research into the products: 1) NO-OX-ID is a contact enhancer(?) that is designed to penetrate the layer of Aluminum Oxide that forms rapidly on any aluminum surface. It's best use case is BETWEEN contact points as...

If you are going to bridge(?) the batteries, this an the accepted method and it wont matter which end of the buss bar you connect to: And it's important to make sure the lengh between the positives and the length between the negatives is the same as closely as possible. If you are connecting...

I had hoped one of the engineers would have jumped in by now (I R NOT), but the difference in MY last diagram and the factory is that the CURRENT flows evenly across BOTH batteries in the factory diagram. You can have the same voltage at the buss bar, but one battery can be weaker than the...

A lot of solar installers will get a nice check and a lot of low income will be on the hook for grid-tie systems they can't afford to maintain. I'm seeing a lot of that with my neighbors. They get storm damage to the roof and even if the panels aren't damaged, they have to pay someone $$,$$$...

Counter point: Of the 5 brands of off the shelf 12v and 24v batteries that I looked at when buying my first large battery, ALL of them were shown by their manufacturer to be able to be safely wired in series up to 48v. I know some aren't, but it is looking like most these days are. I'm not...

I'm going to have too put this up as a sign in my shop: Harry's $10 rule - Add $10/hr to the cost of any project. (although with inflation, it may need to go to $20/hr now.....)

Ok, but that is the same thing we are saying. Notice where the +/- to the system are: opposite ends. So if that is the way you have it connected, then you are right. Your photo of the system doesn't look like that though. This is what your photo looks like: (can you see the difference?)

Then, yes, in that scenario, I wouldn't argue with that strategy. You would have other issues you will need to plan for and monitor (balancing), but I wouldn't call them a deal breaker. Particularly if the manufacturer is ok with using the batteries in series (as most that I've seen are)...

The smaller the project and more it requires it for logistics (and/or portability), yes. But as the project gets bigger, more permanent and more stationary, no. 1 48v 100Ah battery is probably just as cheap to purchase AND ship as 4 12v 100Ah batteries in most cases. Any number of factors can...

I still think your Parallel batteries are wrong (sub optimal). That Yellow going from the pair (Positive?) should be connected to the other battery in the pair, so the power, goes in one battery and out the other, that way the load and charge is spread evenly across both batteries. The way you...

I camp like this on a boat. The short answer is: Portable Electric is lousy for heating. Lighting - great. Charging devices - great. Running fans and motors - good. Running pumps - ok when done right. But heating? Nope. Propane, sterno, sticks in a hobo stove: all smaller, lighter, and...

Umm,... it looks great, but I'm seeing two things that concern me: 1)I don't see hold down straps on the batteries, and 2) if I am correct that the LiPo's are in parallel, I would think it would be better for them to be cabled parallel at the batteries themselves and run the Neg cable from the...

Something else I would mention is a for your PC (laptop I am assuming) is a DC-DC converter. I have one for my laptop so I can plug it into the cigar lighter on the road. Again, more efficient than using the inverter for DC to AC back to DC as the inverter has a loss and the power brick has a...

I completely understand your desire for solar, but let me be blunt: The Honda Portable Generator is your friend on multi-day trips. Whatever system you go with, unless you put in a MASSIVE battery bank and tow a barge with panels, you are going to have to make it work for you by making...

If you only run the appliances one at a time, and run the fridge straight to the battery bank, *I* would think you can go down to a good 2000W inverter. Heat your water, then run the microwave, then run the AC before bed. Do all this and don't plan any week long trips off shore to begin with...

I should what been clearer that I was talking about where they connect to the SYSTEM: the batteries connect neg to neg and pos to pos, but the neg of the system connects to the neg of one battery and the pos of the other battery so that the energy draw and charge is even across both batteries...

A second IDENTICAL battery in PARALLEL is a DO IT NOW for your setup. That said, you have most of the capacity you need but as Supervstech pointed out, that inverter is going to be a huge draw, even at idle. Your number indicate a unit half that size (and with probably half the idle...

Ok, so I am understanding all these appliances are AC? What is the amp draw: AC:_____ amps, expected hours of use:________ Fridge:_____ amps, expected hours of use:________ Microwave:_____ amps, expected hours of use:________ Water boiler: _____ amps, expected hours of use:________ (Is...

I'm curious what size the boat is. Greater than, less than or equal to 9 meters? Is this a day/weekend sailor or a larger/longer trip sailor? Are you using any electric propulsion, or just powering the cabin and helm? Is there a starter motor at play in the plan? The logistics of your boat...

:ROFLMAO: If you can't take a compliment, don't be surprised by an insult.

Dead birds around chemical processing facilities is not uncommon. Concentrates of most elements can be toxic. Chemicals to purify or process most materials are toxic. Burning things, even in nature, is toxic (walk next to a fire of poison ivy or poison oak and see how far you get). If a...

Looking at the logistics of fitting it, I'm wondering about that too. Most of the panels I've looked at are between 16-22wt per SqFt. so if you have a 75x18 boat that's a 1350SqFt rectangle. If you can cover 75% as a combination upper canopy and using the front deck cover, that gives you...

48V for the win. I'm another noob, and while I'm happy with the 24V I'm playing with for my specific application (my boat), I quickly realized that 48V is better in every other application I wanted to use it in. 24V is great for small marine and RV applications, but 48V is better in almost...

10 or 8 to reduce loss. If you ever touch the wire and it's warmer than ambient, you have a problem. I would run each panel to one of these mounted inside the shed: https://www.amazon.com/Miniature-Circuit-Isolator-Magnetic-Disconnect/dp/B09BQR289J then run the cable to your boat charger...