robbob2112
Doing more research, mosty harmless
Show off. I barely speak coherent english..
Perfect except there is no 100/35. It's a 100/30.
Ya know, we have all read your posts and I am not sure you speak english at all
Help choosing Victron Mppt
- Thread starter Troady
- Start date
Ya know, we have all read your posts and I am not sure you speak english at all
Don't worry, me understand you, is enough. I never went to school to learn English, learned on the fly speaking with british people on touristic areas of Spain. Missing grammatical education, no wonder you can't understand me. I just do my best. Same with Dutch and German.Ya know, we have all read your posts and I am not sure you speak english at all
Last edited:
sunshine_eggo
Victron's little biatch
piece of cake.
sunshine_eggo
Victron's little biatch
What is the distance between your alternator and the LFP battery you want to charge, and what is your alternator max output?
Distance 2 1/2 yards. 200 amps alternator.
sunshine_eggo
Victron's little biatch
That's shorter than most.
The risk is the lower voltage of LFP through the bulk of its charge means it can pull max amps from your alternator for an extended period. No way to regulate.
If you have a long distance between alternator and battery, you can get away with minimum sized cables. 2awg "battery cable" can handle 210A, but the long run and resistance means you'll see a big voltage drop between the battery and alternator. That means the alternator "sees" its peak voltage well before the battery gets anywhere near peak voltage, and the alternator will not output any more than the battery can take and reduce its output.
Example: 20' run, 2awg, 14.4V alternator, 200A:
Voltage Drop Calculator
This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
www.calculator.net
Nearly a 9% voltage drop.
Basically, once the battery voltage rises to 13.15V (very low SoC) @ 200A, the alternator will hit peak voltage and taper current. This will prevent you from pulling max alternator current for an extended time.
At only 7.5 feet:
Voltage Drop Calculator
This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
www.calculator.net
Small voltage drop means you'll run the alternator at max output for an extended time.
So, three choices...
0) none of this matters because you have a smart alternator that will regulate its output based on temp
1) you could use really long 2awg wires
2) Get an Orion XS
Suijkerbuijk
I cannot be held responsible for this information.
I gone hook in this one
A cheap dc to dc for the alternator is a renogy model
I have one my self (not connect it on this time)
Its cheaper than the victron models wel the moment i pay for my model.
Its a 20a model but thare are bigger models from the same company
www.renogy.com
A cheap dc to dc for the alternator is a renogy model
I have one my self (not connect it on this time)
Its cheaper than the victron models wel the moment i pay for my model.
Its a 20a model but thare are bigger models from the same company
12V 20A DC to DC On-Board Battery Charger
The best 12v battery charger. Free shipping. The DC-DC Battery Chargers are the most effective method to charge your home batteries from the starter battery
www.renogy.com
sunshine_eggo
Victron's little biatch
ARGH!!! TURDOGY!!!
Brucey
Velcro Man
Therapy bills mounting...
You getting one for each battery bank?
Suijkerbuijk
I cannot be held responsible for this information.
I miss somting?
sunshine_eggo
Victron's little biatch
ricardocello
Watching and Learning
Golly!Turd = poop
Turdogy = my name for Renogy.
Also Turdator for Predator in other threads.
I like the new Eggo-speak.
Small battery bank have his own battery monitor from Epever. Big babk with Victron scc will be monitored by there own victron equipment.
robbob2112
Doing more research, mosty harmless
Suijkerbuijk
I cannot be held responsible for this information.
I use renogy solar panels i do not have problems with it .
Work just fine see that are flat on the roof i loos around 20% of the max watts .
And are thare now for about 4 years on the roof.
For the mppt i do not know .
See and read a lot of problems than again epever the same problems.
The dc to dc i have in review and test it work fine .
Reason i go for that model .
Let's say i get a 12Ft 2 AWG wire straight from 200amps alternator, by calculator, voltage at the end will be 13,65, it is that not to low to charge properly a lifepo4 bank of batteries? I do understand they need 14.4 at least.That's shorter than most.
The risk is the lower voltage of LFP through the bulk of its charge means it can pull max amps from your alternator for an extended period. No way to regulate.
If you have a long distance between alternator and battery, you can get away with minimum sized cables. 2awg "battery cable" can handle 210A, but the long run and resistance means you'll see a big voltage drop between the battery and alternator. That means the alternator "sees" its peak voltage well before the battery gets anywhere near peak voltage, and the alternator will not output any more than the battery can take and reduce its output.
Example: 20' run, 2awg, 14.4V alternator, 200A:
Voltage Drop Calculator
This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
Nearly a 9% voltage drop.
Basically, once the battery voltage rises to 13.15V (very low SoC) @ 200A, the alternator will hit peak voltage and taper current. This will prevent you from pulling max alternator current for an extended time.
At only 7.5 feet:
Voltage Drop Calculator
This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
Small voltage drop means you'll run the alternator at max output for an extended time.
So, three choices...
0) none of this matters because you have a smart alternator that will regulate its output based on temp
1) you could use really long 2awg wires
2) Get an Orion XS
sunshine_eggo
Victron's little biatch
A 12.8V LFP battery can be fully charged at 13.6V if held there for several hours. 13.8V after 2-4 hours. Also depends on the starting current.
The voltage drop doesn't mean it will never get fully charged. It means that the alternator will taper current once it hits max voltage, and as the battery fills, the current will continue to drop as the battery voltage rises. Eventually, you will get to 14.4V.
The issue isn't about getting the battery fully charged. It's about pulling too much from the alternator for too long and cooking it. Most alternators won't output their maximum continuous current without overheating/failing unless they can regulate their output based on temperature. Some can.
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