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That suds pump.
awemawson:
Too late now if you've ordered your Transwave but others may like to know it is perfectly feasible to run a "415v in 415v out" inverter off domestic 240v mains by using a 240 volt to 415 volt transformer feeding two of the three 3 phase inputs. Internally these things take in their power source, rectify it to DC then chop it about to make 3 phase AC. Usually there is a 3 phase bridge rectifier at the input - well if only two phases are supplied you still get the DC out :) The only caviats are a/ derate it to 2/3rds power and b/ a small number of inverters monitor the phases and will report the loss of one phase but they are in the minority.
John Rudd:
And on the back of what you say, a 240 3 phase in will work on household mains,in the same way.....
hopefuldave:
--- Quote from: awemawson ---Too late now if you've ordered your Transwave but others may like to know it is perfectly feasible to run a "415v in 415v out" inverter off domestic 240v mains by using a 240 volt to 415 volt transformer feeding two of the three 3 phase inputs. Internally these things take in their power source, rectify it to DC then chop it about to make 3 phase AC. Usually there is a 3 phase bridge rectifier at the input - well if only two phases are supplied you still get the DC out :) The only caviats are a/ derate it to 2/3rds power and b/ a small number of inverters monitor the phases and will report the loss of one phase but they are in the minority.
--- End quote ---
Even easier, older inverters (ABB ACS300 series, for example) have two banks of reservoir capacitors, a little rewiring to put the neutral between the banks and live to two of the rectifier's three phase inputs and it thinks it has 480v in when you feed it 240... Again, derating by about a third is in order!
John Rudd:
Sounds like a good idea but remember the switchers are rated for a standard 240 ac in.......so they're likely to have a Vce of around 600V.....so sticking more than 340v up them may not be liked.......
philf:
--- Quote from: hopefuldave on May 22, 2015, 01:25:47 PM ---Even easier, older inverters (ABB ACS300 series, for example) have two banks of reservoir capacitors, a little rewiring to put the neutral between the banks and live to two of the rectifier's three phase inputs and it thinks it has 480v in when you feed it 240... Again, derating by about a third is in order!
--- End quote ---
Hopefuldave,
I just happen to have two ACS300 inverters sat doing nothing for the very reason that they wouldn't run from 240V! I tried them with a transformer and they worked OK but I didn't have a big enough transformer to be able to use them on anything useful.
Do you have any pictures of the necessary mods?
:beer:
A Hopeful Phil.
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