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Started making my own solar heating panels for my inflatable hottub Looking forward to test them out in the summer : 2x 4'4' panels with 66 meters 13/16mm irrigation tubing each. Powered by 18W12v pump on a thermostat swithh and a 60w panel hooked to a small " solar generator "

i'd ground everything

only bought a set of litokala. All shit, some arrived at like 2.0v, swollen, missmatched, used. Also had marker numbers on it like 1 3 3 4. as if they were part of some mismatched packs that were taken apart.

3.29 can be 40% capacity on one cell and 70% capacity on the other, balance at the top or bottom, as the voltage curve in the middle is very flat on lifepo4

1 terminal badly tighten can get really really hot. its the only possibility i can think off. I had batteries i finished building and then run 100A+ through them, and then feel the busbars, if 1 of them is clearly warmer , is usually a connection there that isnt 100% tighten.

isnt those 24v to 12v things just for like 30-100watts? you done 24v to 12v and then into an inverter ? :D

Quick update. this system has actually been working "TOO WELL". water been consistently going over 40C (104F) during the day in the last sunny days. Might reverse the thermostat to actually STOP when incoming water temperature is bigger than X, instead of what is at the moment (Start when...

based on the first photo alone. looks like a direct short in the cells, where the blue plastic might have been damaged (vibration?) The casing below the blue plastic is basically a negative terminal. so if cells in series rub together and wear the blue plastic, you have a direct short.

amy said "Shipping by sea, arrival to the door , DDP, tax included, " so i guess i wont be stung by it then

no1 is gonna comment how he has a nazi inverter?

yes, 24Ah before losses on conversion. its the reason why i always measure battery capacity in Wh, as its the same, regardless if you're down converting to 5v, or inverting to 240V

im trying to get a setup that fits into 2.4x3.6m. so might have to look into (4) 72cell panels or 5 small 250-300w 60 cell ones

I'm in the UK so postage/import duties is quite high. I am planning in buying 16 280s for my first system, was just curious on if someone tested these new 310s that shown up last week thats all.

anyone thought of pairing a small compatible 16s Lifepo4 battery, and then parallelling that battery to a massive DIY one?

Spoken with her, they seem to have different (newer) eve cells that come with flat terminals (no screw socket) and they weld studs into them. Anyone ordered those new eve cells yet?

just prompted me to recheck my battery and 1 terminal wasnt very well tight and the busbar was clearly hotter on that 1 terminal. I bet you had a similar issue. 1 loose terminal, lots of resistances, lots of heat, boom

the fact that you top balance them doesnt make them perfect. do a capacity test

thoughts?anyone ordered these yet?

awesome. Amy seems somewhat trusted here, so will take the plunge

you can buy 100AH of lithium cells and a 1000w inverter/charger hyrbid for less

Might be a long shot as most here are in the US. Struggling on which to buy from as the usual recommended alibaba supplier (Amy Wan) is almost $750 on shipping cost alone to UK even if you just order 1 cell + import duty on top. Would prefer from aliexpress just not sure who is trustable or...

would love to see how you fit 4x300w panels (170x100cm each) into a car. you cant even fit that in some RV's

Was through the site, 16 cells was like £4k postage. Should I message her directly and see what can be done?

Thank Very close /above vmp I assume? Not under

500ah x 12v = 6000wh ( assuming lithium with 100% DoD) if you are using AGMs, your useable capacity is more like 3000wh Like above thats about 1500+W of solar panels at 100% capacity for 4~ hours you have to take into account summer and winter though. thing with solar is that the setup to...

Bought my car in Tunbridge Wells. I ordered 16 from Amy Wan last week or so . Waiting now

lifepo4 has a far "flatter curve". which means the voltage difference between 15% or 80% charged is very little. most of readers that will tell you the % of battery on a lithium will either "learn it" or guesstimate based on how much it charged/discharged it

solar water heaters are extremely more efficient at heating water than PV panels. However PV panels can still heat the water a little in the winter, while solar water heaters can easily boil water in the summer, theyre kinda pointless in the winter. depends on the weather where you live

Yes. Although there are also thermostats that have 2 sensors and allow you to do that in 1. However I don't want to stop the system if the water is too hot, as these boxes are all black and sealed, if the water stops flowing, the pipes would probably melt.