On 8/20/19 1:02 PM, Jay Summet via EV wrote:
For a 1 kW home backup solution, it would probably be better to just use a 12volt input inverter so your entire system could be 12v. There are a lot of 1-2kw inverters that operate on 12v input. 24 or 48v input isn't really necessary until you get up into the 3-5 kW inverters.
I'm enamored of the Enphase grid ties; I have a fair amount of experience with them. I've seen a lot of what I refer to as "cheap chinese" inverters work poorly, run hot, fail. The Enphases are near bullet proof.
One less power conversion step, and you can use the vehicles' accessory 12v battery as a "mini buffer" instead of having to have your own 24v buffer battery.
I don't plan on a 24v battery. I don't think I even need the EV's 12v though I would tie the "upverter" to the 12v battery, I would depend on the DC-DC to supply power. Do you believe I need battery buffers?
I'm interested in 24v solely to supply the M215s.
Having said that, I do have a 24v home backup power system, with an inverter that can run my well pump (2.5 kW continuous, lots of surge draw), but I'm taping my (130v) truck battery pack with a 500w DC2DC power supply that goes from 130->24v to keep my 2kWh "buffer" battery topped up.] But since I have a DIY conversion, access to pack voltage is easy, and it's in the right range for the power supply I found [ Meanwell SD-500H-24] [Alternatively, if you do have 2 EVs, you could use each vehicle to charge one 12v battery, and then use those two 12v batteries in series to get 24 volts, and have 2kW of input power....]
I do see that as a remote possibility but not my first choice. Because of having to wire the cars together.
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