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diy solar

Pwm behaving wonky

Battery is dead. At 12.1 it's pretty much given all its really got. 12.7 is still charging heavy amps and hasn't even started its absorbtion phase.
Soo give up ? I added half a syringe in each hole giving each hole a full syringe worth of distilled water... I will charge the 2 batteries that are in parallel overnight.... Of course switched to "repair" mode.....I flipped the french accent button to off and took a video but I see no reason to torture anyone any further
 
Time to go shopping: -

A proper MPPT charge controller that can handle the power from your panels.

New batteries, LiFePO4 if your budget runs to them.
Thanks but I will pass on lithium until it is less explody, or less catching on fire.... So if I cannot find victron, what mppt should I look for ? ( I think 100 amps is best because id like to add identical panels to this setup....it only costs 3000 php, Roughly 60$usd.... So look for something with 48v in and 12v out ???
 
LiFePO4 (Lithium Iron Phosphate) packs are at least as safe as lead-acid. I still wouldn't have one in our living area, but I wouldn't have lead-acid there either.

For your MPPT look for a "universal" unit that can handle 12V, 24V (maybe 36V and 48V) and the highest input voltage you can find (most seem to be about 150V ish). We have a couple of PowMr units that handle up to 150V input, they are definitely of the "low-cost Chinese" variety but work well enough if you don't push them to the limit.

If you find something locally, post here so those-that-knows can pass judgement, there are many, many fake units :)
 
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I setup the wall charger to both batteries , set it to "repair" and left it like that all night... Woke up , removed the clamps from the terminals and put back the solar power onto it (didn't want to have 2 power sources going to the batteries simultaneously).. connected my bosca 500w peak inverter that only outputs modified sine wave. and for the past 1 hour I've been powering my electric fan (weird hum) and charging my mobile phone, so either I'm using the power that I put inside the batteries last night or I'm actually using solar power....

No beeping from the inverter for nearly 90 minutes
 
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LiFePO4 (Lithium Iron Phosphate) packs are at least as safe as lead-acid. I still wouldn't have one in our living area, but I wouldn't have lead-acid there either.

For your MPPT look for a "universal" unit that can handle 12V, 24V (maybe 36V and 48V) and the highest input voltage you can find (most seem to be about 150V ish). We have a couple of PowMr units that handle up to 150V input, they are definitely of the "low-cost Chinese" variety but work well enough if you don't push them to the limit.

If you find something locally, post here so those-that-knows can pass judgement, there are many, many fake units :)
Okay so ask seller if the mppt can accept 48v input.. check, honestly I don't care if it is fake and has 1000 USB ports, as long as it puts a bit of 12v power towards my battery bank...I'm rather simple
 
After 3 hours or so of running my electric fan on the inverter (and charging my smartphone, the inverter finally started chiming, and this electric fan wouldn't take more than 50-60 watts... So I conclude along with all of you that the batteries are kaput (German slang for dead)
 
Time to go shopping: -

A proper MPPT charge controller that can handle the power from your panels.

New batteries, LiFePO4 if your budget runs to them.
I'm all for lithium if some of you can guide me through the safest way to do this, I'm definitely go for that, it is more energy dense, I'm certain that the battery has to have a bms and that I have to tell the mppt that the receiving battery is lifepo4, and perhaps a fan blowing on the battery, (at 5-10 watts it isn't doing any harm)
 
@corporal_Canada you might want to have a look at Will's (now free) book :)

 
@corporal_Canada you might want to have a look at Will's (now free) book :)

Wow thanks, that looks handy, if only I could find a winninego around these parts id never pay rent again 😉
 
Yesterday i added three syringe fulls of distilled water in each whole still no overflow use the wall charger to put juice into the batteries overnight and in the morning i used the inverter and run the electric fan which consumes 55 watts for a total of 3 to 4 hours until the inverter started chiming keeping in mind that the solar panels were connected at the same time so theoretically the inverter should be running the fan non-stop however i think it's not taking anything from the solar panels at all or is it because the pwm isn't using 48 volts ?
 
Used electric fan on inverter today from 0730 to 1100 and yes I'm doing my best to save the 2 batteries... The mppt I'm looking at is identical price to 1 battery.... Here I'll post it

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Don't see any USB ports, and I also see 48v on the title... Yay or nay ? Oh and when using the inverter to power my electric fan, it does produce an audible humm, I'm guessing this is because the inverter is modified sine wave, is this harmful to the fan ?
 
Don't see any USB ports, and I also see 48v on the title... Yay or nay ? Oh and when using the inverter to power my electric fan, it does produce an audible humm, I'm guessing this is because the inverter is modified sine wave, is this harmful to the fan ?

The MPPT looks OK.

The 12-48V refers to the system battery voltage, this unit will auto detect what you have and adjust itself accordingly (you MUST connect the battery before the solar).

Note that it's only good for 80V @ 720W of solar when on a 12V battery.

An MPPT works magic so that the 80V on the input becomes 14V (or whatever charge voltage you've selected) on the output with an associated increase in the available current. Power Out (VxA) = Power In (VxA) less a bit for converter efficiency.

Yes, your fan buzzing is due to a modified-sine inverter. The fan will run hotter than when on mains and may use-up run capacitors.
 
The MPPT looks OK.

The 12-48V refers to the system battery voltage, this unit will auto detect what you have and adjust itself accordingly (you MUST connect the battery before the solar).

Note that it's only good for 80V @ 720W of solar when on a 12V battery.

An MPPT works magic so that the 80V on the input becomes 14V (or whatever charge voltage you've selected) on the output with an associated increase in the available current. Power Out (VxA) = Power In (VxA) less a bit for converter efficiency.

Yes, your fan buzzing is due to a modified-sine inverter. The fan will run hotter than when on mains and may use-up run capacitors.
Capacitor I can replace I think I have a 2 farad one lying around.. but if the damage goes beyond that, I surrender faster than (insert surrendering country here) and buy a new one, however this particular fan cost me 20-30$ and coming from a socialist country, I'm barely surviving here.... In case I didn't mention it, I need an anti psychotic to help deal with my PTSD ( see the movie notebook just once and it's all downhill from there)...

And in your opinion is it worth it to continually add distilled water to the 2 batteries ? Nothing has overflowed yet and I did disconnect positive of the solar from it and the only power they get is from the wall charger overnight..
It does appear to be lasting longer and longer each time I reproduce these steps... And yes I know watching east Indian videos on YouTube is not a good guide to go by but if I can even get any life out of the 2 batteries I can not panic that my entire solar setup is down to 1 panel and 2 long cables.... Because according to all of you the pwm is crap and the batteries are both dead...
 
Added 50 ml of distilled water in each hole charged all evening, repeated the process before diving into bed, will charge all night... None of the holes are overflowing.. I hope I'm doing something right...
 
Up to date progress report, I disconnected the 320 watt panel and put a smaller one in it's place, it claims to be 400 watts but has the physical size of a 50 watt panel, I connected it to a fake mppt and put it on the batteries, which I did fill to maximum with distilled water.... the cables coming to my home from solar did give me a reading of 14v or so....... tomorrow will be the ultimate test to see if it can run my electric fan all day... , 1 tiny detail the screen of the fake mppt is blank...
So if anyone is still here, please tell me what next until I get the funds to buy the mppt..
 
Did you connect the charge controller to the battery before you connected the panel?

What is the Voc and Vmp of the panel??

Does the battery have something like 12V on the terminals (to wake up the controller)?
 
Turns out the 80 amp fuse popped, so I put the 50 watt solar panel, connected it to a 20 amp pwm to at least put some thing into the battery bank, I'm not certain but I think I kinda fixed the batteries
 
Did you connect the charge controller to the battery before you connected the panel?

What is the Voc and Vmp of the panel??

Does the battery have something like 12V on the terminals (to wake up the controller)?
Yes batteries first and that is how I discovered that the 80 amp fuse blew, and on the back of this smaller panel I think I saw 14v.. and now with the fuse replaced this default pwm, I actually have a battery voltage reading of 13v.. as for vmp and voc, I'll take a look tomorrow, I had this panel for a while, it says 300 underneath but I don't think it is even 100 watts, but if it'll gimme 50, I'll be able to power my electric fan... hopefully charging and discharging the battery this way will help turn the water into acid, I dunno, im no chemist...

As for lifepo4 battery, no hurry, id rather damage a couple of SLA batteries before I move to something that can burst into flames if misused...
 

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