ezzpete
1 mW
thanks Hyw89, looks like just what i need. a bit pricey, so i'll have to save up.
Using an inverter to charge from a car
- Thread starter VultureChow
- Start date
Hwy89
10 kW
Yeah, that's why it's on my wish list instead of in route to my P.O. box. Where do you go to boondock in the desert?
ezzpete
1 mW
i like to go to a place along Hwy8 about 40 miles west of Yuma, called Highline Hot Well. there's BLM land and a hot spring. it's mostly Canadians and full time van dwellers. also like to go to Quartzsite and a spot at the South entrance to Joshua Tree NP. but most of the time i'm at Highline.
I do,i charge my 48v 20a lifepo4 battery this way.VultureChow said:
My charging system is 4 195 watt solar panels,on a good day i get 60 amps at 12 volt.
My 48 volt lifepo4 charger is 6 amp,so should be 24 amps at 12 volt (4x12 volt=48 volt).
My solar panel charger tells me i am using 30 amps to charge the lifepo4 batteries,i think this would be fair considering the conversion loss from the,1 solar charger to 12 volt batteries,2 12 volt battery to inverter,3 inverter to lifepo4 battery charger.
dnmun
1 PW
what if you could break the 48V pack into two 24V sections and have some JST plugs so you could wire the two sections in parallel under an 8S BMS and then use those for the batteries under a MPPT type charge controller so it would charge them up to 29.4-29.8V DC and then you could wire the panels in series to get higher voltage than the charge controller so it would still charge up the pack to full voltage on each cell under the 8S BMS.
then you could do like the lipo guys do and reconnect the two 8S sections in series under a 16S BMS for LVC and use it as a 48V pack again to drive the bike. that would be efficient but you would need two sets of batteries so you could use one while charging the other.
then you could do like the lipo guys do and reconnect the two 8S sections in series under a 16S BMS for LVC and use it as a 48V pack again to drive the bike. that would be efficient but you would need two sets of batteries so you could use one while charging the other.
RLD70
100 W
dnmun said:
That is kinda what I did with my old 48v lifepo4 pack when I destroyed one string by overdischarging the pack when the bms shut the pack down while still too far from home. Only difference is I turned it into 3 12v 20A packs that the panels charge up as a 12v 60A pack and it actually charged up the 60v 10A SLA pack from around 54% up to 95% charge and the voltmeter didnt even read under 13v before I switched the charger to the house outlet. Needless to say I wont ever over discharge a pack again as I will have the solar power station with me when I travel further than 40 miles with the 12v 60Ah lifepo4 pack on the trailer.
dnmun
1 PW
i was thinking more in terms of efficiency from panel to battery since you have two voltage changing steps. i just do not know if the MPPT charge controllers can be hacked to the voltage it takes to charge the 8S lifepo4 to full charge. i only recently learned how they work, like a buck DC-DC converter.
panurge
10 kW
Charging the bike from the 24v system of an HJ toy.....^_^ at 120A*24v this battery is not even "touched" by my tiny 12s10Ah nanotech (8-9Ah to full charge from a 90% discharged pack...).....I think that's exactly the max power configuration, the RC charger has been projected for......
Of course using a similar output grid P.supply works the same way.....
tomorrow at next refill....I will show the bike charging from a true PV power plant (20Kw)
cheers
Of course using a similar output grid P.supply works the same way.....
tomorrow at next refill....I will show the bike charging from a true PV power plant (20Kw)
cheers
Attachments
speedmd
10 MW
el_walto said:
No standard! With or without idle control? If it idles low, can be as low as 15-20% of rated current.
I would go with the RC charger for certain unless you want to run a microwave or some other ac devices. Solar cells may be a possibility to keep from getting the car stranded?
panurge
10 kW
jkbrigman
10 kW
Jules - wow, those PV units are awesome - thank you for posting the pics. Can you share the brand name of the panels and some specifications please?
panurge
10 kW
Yes, of course....the plant is made by 2 strings of 42 panels, 235Wp each....you could see the panels here...http://www.schott.com/photovoltaic/english/schott-perform-poly.html
There's a Siemens Sinvert PVM20 inverter and Hilti supports....Its peak is at 19.8 Kw.
This kind of plant could cost (here) from 50 to 80.000E depending from the panel source and mostly from the installation's needed works a nd if you can do some of them by yourself....
The estimated time to repay it (at my latitude and area) is 6-7 years (including savings and incentivations)
Cheers
There's a Siemens Sinvert PVM20 inverter and Hilti supports....Its peak is at 19.8 Kw.
This kind of plant could cost (here) from 50 to 80.000E depending from the panel source and mostly from the installation's needed works a nd if you can do some of them by yourself....
The estimated time to repay it (at my latitude and area) is 6-7 years (including savings and incentivations)
Cheers
Solar panels rock :wink:
Kingfish
100 MW
panurge said:As promised Charging from the power plant of my Farm
^+19.8kW
Kudos to you!
What else do you use that array for? And how much did it cost you?
Duly impressed with your alternative landscaping! KF
jkbrigman
10 kW
fechter said:
panurge
10 kW
Kingfish said:panurge said:As promised Charging from the power plant of my Farm
^+19.8kW
Kudos to you!
What else do you use that array for? And how much did it cost you?
Duly impressed with your alternative landscaping! KF
Hi Kingfish
The farm's vocation is concerning Forestry, but we have also a small B&B and we makes typical Tuscan Food products all made by wild (vegetables, fruit and game)
The Array is used for part of our static energy needs (except from heat, for this we have a wood thermal plant).
Since we are at 800-1000 meters of elevation we are in a very marginal situation for any kind of agricolture production except for honey. So we are focused in Natural quality production, and to get the Max from what our area can offers....This plant has been a critical step forward about our expenses....without incentivation's funds from EU and the Italian government, this was not possible to be realized....that's not a good thing, but without these incentives, and therefore the possibility to drastically reduce our expenses , probably, we were forced to stop our activities.
Activities such as ours are very important to keep in good condition marginal areas, prevent forest fires, keeping intact the habitat of many animal and plant species, and make them accessible to people who come from town ....
The mistake is that the same incentives are also given to companies, often industrial, and often for unsustainable activities, which give nothing back to the community or to the Sphere .... and that are only vampires, for the community.
The Array is made by 84 panels to reach 220VDC 20Kw and then DC-AC inverted for our needs and to be grid connected...
I've already posted the typical costs for this, here..... We got good panel prices from a really big group buy, and we made almost all the ground and installtion works...so we have been able to stay in the lower range....
Cheers
RLD70
100 W
As Im pretty sure anyone that deals with solar panels will agree, theyre more cost saving then continuing to pay outrageuosly high electric bills. Its just that initial cost thats the deterrent for most people and the array that panurge has would power a small house off-grid which the electric companies would absolutely hate. Kudos to you sir. 
