What value resistor?
RV 48V to power 12v Loads
- Thread starter mkgolfer
- Start date
the one referred to earlier in this thread:
https://www.amazon.com/Pieces-Aluminum-Housed-WireWound-Resistor/dp/B0C7458DPM/
That one was meant for continuous operation in line with PV input to reduce short circuit current if things went wrong with MPPT, not as precharge resistor. You need to use 10 ohm resistor for precharge. Explains big spark you got. It passed ~450A on contact. Better than nothing but still too large of inrush current. Good thing MPPT survived, I guess we now know it can handle 450A input current for a moment.
Victron go Hard I guess. I don't have a shop full of extra bits and bobs and do-dads ect, everything I have has to move down the interstate!
IDK, so far so good, we'll see how things turn out for a while with proper bus bars and 6awg wires. It's still probably safer than this stock AC/DC converter.
Unless some product comes out soon, or someone shows me something I dont know... I'll probably just bite the bullet when I have an address again and "do it right.":
Buy two victron 48v-12v/30amp converters in parallel, running into a victron 12-12/50amp charger, into the marine battery. Probably a little less efficient than this current setup, but at least it's "Approved" and safe long-term.
Would I have been better off using my lightbulb for precharge? This is what I use to precharge my Quattros and everything else on the 48v side:
Yes absolutely. I thought that's what you were going to use.
TheAlmightyOgreLord
New Member
Would an 8 Ohm resistor do the job for 600 watts at 87V?
I used a 25ohm 50W resistor with 48v Vatrer battery and Victron Multiplus II 3kva.
No sparks and inverter turned on in a few seconds after.
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It is expensive, but I used this CUI (respected brand) dc-dc from digikey to power the 12V systems on our sailboat off of our 48V battery bank. It is a 600 watt unit, all sealed. CUI is based in Oregon.
I found this. May be what he is looking for. 1800 or 3000 watts
www.magnum-dimensions.com
Converters | Magnum Dimensions
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