/diy/ - Do It Yourself

Yeah I'd start with a better charge controller. If the chinkshit one is doing a piss poor job that would definitely shorten the lifespan of the battery greatly.

>>1928392
Oh but the battery is now no good and needs replaced so I don't know what battery solution I should go with

>>1928387
This measurement is useless because it doesn't factor in the power draw from the inverter itself. If you have an inverter hooked up with no device plugged in, it will still drain your battery. For example I have a 750 watt inverter from Harbor Freight that if left turned on but not powering anything will drain 1.5amps per hour from the battery. Just from being turned on. You need to measure the amount of AMPS being drawn directly from the battery with the inverter hooked up and the device running. Take a DC clamp meter and put it over the negative or positive line only between the battery and inverter and see how much amps are being drawn with everything running. Then divide that number by 50 (amps) because if you want a 100 amp battery to last, you can only discharge it 50 amps before you need to fully recharge it again. Whatever that number is, that's how long you can safely run your setup before you need to charge it up again.

>>1928512
Also a 75 watt solar panel will probably output about 3.75amps per hour max on a good day, and you're only likely to get about 6 hours of full 3.75amp juice to the battery. So at peak sun hours you'll be getting 22.5amps back, and then a little extra here and there as it gets darker. I'd start with a second 75 watt panel first before you start spending all kinds of crazy money. Best to keep the battery you DO have juiced up as much as possible.

>>1928515
Anon, the battery I have is trash now. It reads 9v under direct sun after hours
I do not have a battery currently as a result and will need one.
Can either get $100 100ah auto store one or $175 100ah SLA or same cost 30ah lifepo4

>>1928534
The more amps the better. Once your battery goes under 11 volts it will never be the same. There's some stuff that gets on the plate as the battery discharges, and when you charge the battery it all falls off the plates exposing the base metal again so you have a charge again. But once you let the battery voltage get too low too much stuff builds up on the plates and it will never come off the plates no matter what you do, so the battery becomes useless. Go for the cheaper 100 auto store battery and install a second 75w solar panel

>>1928534
lifepo4 is the superior chemistry, unless you need it to work at low temperature. However, 30ah is probably not enough if you need it to run 24/7.
You can increase the life of your battery by limiting the voltage range to safer values, which your chinkshit controller may give you the option to do. This reduces the total capacity of the battery, but can dramatically increase the life of the battery. Also better verify the voltage with a voltmeter, the voltage displayed on the charger may be inaccurate by a significant amount due to chinese cost cutting.

>>1928387
what's the draw on your networking gear? Even without knowing the draw on your gear, scaling up your battery storage capacity is probably your best bet. it really would suck to spend money on a battery but neuter its lifespan.

To prolong the life of your battery you want to keep the draw under C/20 (C being the AH rating on the battery)

so for a 100AH battery, you want to keep the draw at under 100/20 => 5amps.
if you get 2 100AH batteries in parallel that calculation becomes 200/20 => or 10 amps.

That said I'd get a mppt controller and a 100ah battery -- as well as a low voltage disconnect. you want the circuit to cut out before the battery gets too low (like maybe 12.3v?).

>>1928387
False flag desu, no way something like that would pass inspection, the picture doesn't even show the reason for the wood and tie

>>1930423
>Kek its fucking real.
it is really mounted that way.

>>1930429
Wew. I don't know much about cars but the method of mounting seems fine in itself, but the wood is obviously retarded. Any car lads in want to explain this?

>>1930438
An engineer designed it, it was approved, in the field it was causing issues, they can't fix this issue until the next production version, this is the cheapest and lightest workaround until then. Somebody figured it would be better than duct tape.

>>1930389
I don't know the exact draw but my guess is 15-18w

>>1928387
If you have an 18wh load you need at absolute minimum a 36 ah battery and a 108w panel. To be safe/reliable I would go with a minimum of 60ah battery(lead acid gets ruined if depleted for any significant amount of time), and a 200w panel. I would just stick with lead acid of some sort because not only is it cheaper, but whatever charge controller you need will be cheaper as well. Your old battery shit the bed because it even though it had a huge capacity, your 75w solar panel was not supplying enough energy to fully recharge it.

>>1930654
OP, there are several issues.
-Are you running this gear from an inverter connected to your battery, or is it 12v or whatever? If it's on an inverter, try to find a way to do it DC if possible, you'll get by with half the batttery capacity as inverter quiescent current draw is retarded.
-Get a better charge controller with a decent charging profile (bulk, absorbtion, float charge MPPT)..... they're cheap as fuck now.
-GET A FUCKING DEEP CYCLE BATTERY, not a marine battery, not the auto part store version of a deep cycle battery, just spend the same 100$ to get a 12v Crown golf cart battery and call it a day; the performance as it ages will be DRASTICALLY better. Don't let parts store guys tell you that a marine battery or Optima or whatever is what you want. The internal construction of deep cycle batteries is different and will probably add 5X time to the life cycle of the thing. You can quickly google for a comparison of lifetime of a deep cycle battery vs a marine battery which is run under the same duty. THIS IS YOUR PROBLEM. THIS IS YOUR SOLUTION. Something like a trojan 1275 will run you around 150$ or so from a golf cart or battery supplier. You can also pick up used ones for cheap on craigslistl they come with a manufacturers warranty (normally a year or 2)

>>1930447
That pic also popped up during covid, which could mean there was a shortage from whoever made that part and they didn’t want to stop the production line for it, so they improvised.

>>1930713
It's all 12v and 5v
ook I'll first measure the draw accurately and then probably get deep cicals
I just thought the lifepo4 was neat because it's very small and can be used like 90%dod for 3000 cycles

>>1930926
It sounds like you need a second panel too. If you get yourself a DC amp clamp or whatever way to measure the draw, see what your panel is putting out throughout the day, you’re not going to average anywhere close to 75w and the sun isn’t in the center of the sky 24/7 with no clouds. That will kill your batteries real fast if they’re nearly flat all the time, especially lead acid batteries.

>>1928387
You may not realize this but the image you posted is actually quite racist to my people. Please delete it by clicking on the check box at the top of the post then scroll to the bottom of the page and check the 'file only' box then click delete.

I'm sure you did not intend to be racist, thank you for your understanding and corporation over this incident. I'm sure if we can resolve this quickly we can avoid telling your human resources officer, bank and landlord that you are a racist.

>>1928387 (OP)
You may not realize this but the image you posted is actually quite racist to my people. Please delete it by clicking on the check box at the top of the post then scroll to the bottom of the page and check the 'file only' box then click delete.

I'm sure you did not intend to be racist, thank you for your understanding and corporation over this incident. I'm sure if we can resolve this quickly we can avoid telling your human resources officer, bank and landlord that you are a racist.