Quote:
Originally Posted by Piotrsko
4kw @ 120v =33.3333 amps then add some for inverter losses so under 50 amps. 4kw @12 volts =333.3333 amps power in. Like > 2 gauge fairly short battery connections and some serious battery storage like a volt battery pack. Bet it cooks itself at those loads
Hmm, but no mention over on the diysolar site of this. Must be chineseium
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This is why I decided to go 48V for my Ambulance / RV conversion. Once you start pulling any real loads the current and wire sizes get crazy. Even running a small electric heater as a test through a 2000 watt inverter put a huge sage on my 12 V battery voltage in my old campervan. (2 x 6V / 200 amp golf car batteries in series) 12V is fine for running a small super efficient fridge and charging some portable electronics but not much beyond that.
I also didn't want the hassle of stringing together 8 12V batteries when I could buy much more compact 48V server rack batteries. It is also very hard to find a 12V charge controller that can handle 1800 watts of solar.
This isn't a surprise though. It is almost universally agreed that cars should have moved from 12V to 24V 40 years ago and should be 48V today.
Quote:
Originally Posted by RoadRaceJosh
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I'm 95% sure I'll be bying a 48V Victron Multiplus. That 5% uncertainty is whether I want to upgrade to multifunction unit. They take less space, and make the wiring cleaner but also cost more and give a single point of failure.