Recent content by MegaMosquito

I'm feeling roof-size-envy looking at your roof, @corn18 :)

Thanks for replying with such detail! All of this is very helpful to me. I like the above suggestion very much and will put a switch on each battery. That will be very convenient. Good point. Once I settle on the final PV array, I'll re-size the MPPT appropriately. From discussions in another...

24V is looking pretty good to me now, but I remember reading somewhere that the rule of thumb is to use only up to 1kW of A/C loads with a 12V system, up to 2kW loads on a 24V system, and then to use 48V systems if you will ever have loads greater than 2kW. What do you all think of this rule of...

In a compartment, that I think will be "near room temperature" (or warmer).

The battery bank will be in an interior cupboard area and my plan includes forced air ventilation from/to the living space. I think it will normally be well above freezing in there (or we will be frozen too!) I originally felt I needed heated batteries because I was thinking of a different...

Yes. I see. Two of those are just slightly larger than the 48V pair and provide the same kWh total. Then I could switch to a Multiplus II 24/300/xx. That would make Vbat+5 charging easier (anything over 30.6V to start). Thanks!

Lol. I hope you don't. That sounds rather unpleasant. I just copied/pasted the product documentation about the -25C (https://www.epochbatteries.com/products/48v-100ah-lithium-server-rack-battery-size-3u-ul9540-pending) The SOK 48V/100Ah batteries are certainly sweet hardware, but they are...

I agree it would be easier but my unfortunate space constraints are holding me back from that. To get the same (in kWh) storage capacity with 24V batteries takes too much room for my tiny "wiring closet" (which originally used to be an actual closet, lol). However, your excellent suggestion to...

Yeah, that's fantastic. I hadn't considered the possibility of doing something like this. Thank you so much!

Cool! So I think you are saying I could use multiple MPPTs (in parallel) in this system (connecting a subset of the panels to each. Is that right? I guess then I would have to have multiple wires going through the roof. And I would essentially have multiple completely independent solar arrays...

I forgot to respond to your SOK battery comment. I did look at SOK, but I can't fit a comparable SOK battery bank in the small compartment where I want to put my batteries. The EPOCH batteries are similar in build, but 48V (which tend to be smaller per Wh) and internally heated (I travel to very...

Thanks @ScrotusGobbleBottom! I think you (and others) are highlighting my fuse strategy is incorrect in a few places. I will rethink all of the fuses.

Thanks @sunshine_eggo! I'll check out that shunt. Lol. Sorry. I'm not buying 95ft of 2/0. I'm just noting the maximum length of that gauge wire at that voltage and amperage. My little RV is only 24ft long so I would have a hard time using 95ft of wire. Where I am locating things the inverter...

I wrote 400A for the wire because that is the battery peak discharge amperage (15 sec) but I fused it in the distributor to cap it at 200A because that's the max continuous discharge rate of the battery. And yeah the "Multiplus II 48/3000..." is 48V 3000W.

Thanks @time2roll ! And ouch! I changed up the solar array from my previous design but forgot to recalculate the controller. Will fix. THANKS! I did not know Victron made 48V-to-12V converters. I'll check that out. Good point on the 100A fuse too. I sized based on the max charge rate of the...